Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|
 Blocking:   |  Reproduced by developer:  1
Analyzed by developer:  0|
-+-
Comment (by varenc):

 For those struggling with the avfoundation audio stuttering issue, I
 resolved it just using the older ffmpeg 4.2-tessus to record.  That
 predates this ticket so clearly YMMV. Specifically I was getting audio
 stuttering with avfoundation only when using a virtual audio loopback
 device. (Loopback/Soundflower/etc)
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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|
 Blocking:   |  Reproduced by developer:  1
Analyzed by developer:  0|
-+-
Comment (by varenc):

 For those struggling with the avfoundation audio stuttering issue, I
 resolved it just using the older ffmpeg 4.2-tessus to record.  That
 predates this ticket so clearly YMMV. Specifically I was getting audio
 stuttering with avfoundation only when using a virtual audio loopback
 device. (Loopback/Soundflower/etc)
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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|
 Blocking:   |  Reproduced by developer:  1
Analyzed by developer:  0|
-+-
Changes (by cehoyos):

 * priority:  important => normal


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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  important|Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|
 Blocking:   |  Reproduced by developer:  1
Analyzed by developer:  0|
-+-
Changes (by bgreen965):

 * priority:  normal => important


Comment:

 This is still an issue on 4.3. Is there an update for the patch?The bug
 causes audio dropouts that make AVFoundation audio unusable.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|
 Blocking:   |  Reproduced by developer:  1
Analyzed by developer:  0|
-+-

Comment (by Correa):

 It's not just the video frames that has drops but the audio as well (see
 #4513), and then it's very noticeable. Been trying to find a solution to
 the problem for a week in a program using ffmpeg as a library and only
 applying this patch that I was able to hear intelligible audio.
 Unfortunately after the commit with support for raw video this patch
 doesn't apply cleanly anymore on top of HEAD.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 I'm note sure if this actually comes into the game here. If so, I would
 why frame drops only happen so "rarely".

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 I wasn't aware at the time of posting this ticket, but I've recently
 learned about VFR, CFR, and how they relate to each other.  Based on my
 testing with other software, it seems I can only capture every frame
 properly when recording VFR, as CFR will guarantee that frames are lost as
 the sources in question (contrary to what I previously thought) are
 ''not'' a constant rate.  Their advertised rate is 60 but in practice the
 FPS always fluctuates, making CFR unreliable for recording.

 I believe recording with the native input frame rate as variable might be
 the solution (as it was in other software) but I haven't been able to test
 it.  I tried `-vsync 0` (input, output, and also both at once) but the
 resulting video is always considered constant.  How do I tell ffmpeg to
 use VFR for input (and really that should be the default behavior)?

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 Expect me to continue this year.
 Unfortunately, I can't make any more promises.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by eugeneware):

 Hi Thilo, I know this on the backburner, but do you have an estimate on
 when you're likely to get time to get back to this?

 There's quite a few projects like https://github.com/wulkano/aperture.js
 which could be using `ffmpeg` and thus produce a platform-independent
 screen recording code-base which are having to fork their code for OS X
 and use Swift/Objective-C directly to get a quality screen recording with
 audio which is a shame for both performance reasons and also the audio
 glitching.

 Hope everything is going well with the code-base merge. Good luck, and
 thanks so much for your incredible contributions. My mind was blown when I
 discovered last week that this was even possible!

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 All right so I have yet ''more'' information that might be helpful.  I
 have these 2 videos recorded via Syphon Recorder (couldn't use PixelToy
 because it didn't work with Syphon Inject):

 (Ignore registration prompt and download directly.)

 https://www.dropbox.com/s/2wg1hwydxomdgaa/60.mkv?dl=0
 https://www.dropbox.com/s/l56iuma9hrz9uum/AFAP.mkv?dl=0

 The first one is very similar to the videos I get when recording using
 ffmpeg.  The second is perfectly smooth.  The difference is in choosing a
 number frame rate versus "As Fast As Possible" in the preferences.  Here
 are their average rates respectively:

 [[Image(https://puu.sh/rgumQ/57d2f5abed.png)]]
 [[Image(https://puu.sh/rgumk/7e86c11bd3.png)]]

 The source in question does not run higher than 60 FPS anyway, so choosing
 "As Fast As Possible" nets every possible frame it can deliver, resulting
 in a perfect video.

 Is there a way to set ffmpeg to record "as fast as possible" with
 AVFoundation screen capture?  I think that may be a good workaround for
 this issue for the time being.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 I know this issue is on the back burner for now but I have some more
 information that might be helpful to you guys.  I have a couple recorded
 tests using Pixel Toy here: http://puu.sh/pX4FU/8119e38474.xz

 Included are the console outputs and screen shots that show the write
 speed during the screen capture as well as what my SSD is capable of.

 Now here's another tidbit that might be a factor.  I have an app called
 RefreshRate that displays the rate of the GPU currently selected.  I
 forget where I got it but I've uploaded it here:
 http://puu.sh/pX4GV/594298bee7.tar

 According to that, my AMD Radeon 6750M has a rate of 59.901460.  I'm not
 sure if this is playing a part but there it is just in case.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 Came across something curious in a recent test.  I did a lossless RGB
 recording at 720p and when played back in ffplay the FPS doesn't seem
 smooth (as much as usual, anyway).  However when played back in VLC it
 seems fine.  Still has the intermittent drops but the rest was smooth.
 Here's an example:
 https://www.dropbox.com/s/du4bxjltwi0uae3/720p60.mkv?dl=0

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 Unfortunately there has been no progress for a long time.
 You can expect me to get back to the overhaul patch soon.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 Replying to [comment:36 thilo.borgmann]:
 > Thanks for the feedback!
 >
 > The overhaul patch is going to be void soon since we're currently trying
 to get a common codebase with Libav. This will unfortunately postpone a
 real update on this device for some time.
 >
 > However, thanks to your feedback, I will reevaluate again the
 corresponding tickets for the avfoundation device.
 >
 > Thanks!

 Is there currently any way to test?  I am unfamiliar with Libav.  I'm also
 curious if this problem (this ticket) is the result of limitations within
 AVFoundation itself.  Thanks.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 Thanks for the feedback!

 The overhaul patch is going to be void soon since we're currently trying
 to get a common codebase with Libav. This will unfortunately postpone a
 real update on this device for some time.

 However, thanks to your feedback, I will reevaluate again the
 corresponding tickets for the avfoundation device.

 Thanks!

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by fthiery):

 For what it's worth, the single file patch here solves the issue in our
 case, but not the bigger overhaul 3-part patch that is suggested in #4513
 and available here:
 http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/203959/focus=203966

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 Did you try to use -audio_format_index N to chose a 49kHz format? Does
 this work for you?

 Fro me, FFmpeg choses the first format available if no index is given
 which corresponds to 192kHz for the SoundFlower device. It sounds like
 FFmpeg resets the format within the SoundFlower audio configuration for
 you?

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 I am not trying to get 192 kHz working, I am using 48 but ffmpeg is
 forcing it to change to 192.  It only does this in the build from the
 mirror.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 I tested with Soundflower and it seems like not being capable of doing
 more than 96kHz during passthrough - means it is not the avfoundation
 device to blame for 192kHz not working.

 I will polish up the patch on github and post it to devel asap (means next
 week, unfortunately).

 Thanks.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 I found it non-free on Steam so I can't test with that.
 My tests with PixelToy validate my window server assumption.
 I would appreciate it if you would reevaluate using PixelToy (free at Mac
 App Store, the snowfall set works pretty well).

 For the audio part I will have another look at higher bitrates than my
 current devices offer. I would also appreciate to see the format listing
 of you audio input devices.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 For the audio:

 I forgot to mentioned there are new options for that.
 "-list_audio_formats true" shows the formats available.
 "-audio_format_index N" selects the one you want.
 I tested with my phone connected to line-in and it works for me with any
 of the formats given there (which are not marked as unsupported).
 Please post the output of -list_audio_formats here and try some another
 formats for recording - static (silence) seems to be just another problem
 I did only encounter with microphone so far.

 For the video:

 I don't see any problems in the first few hundred frames, visually
 checked.
 However, there are duplicated frames like 790-791. This looks to me that
 the applications window was not redrawn by the window server. I encounter
 similar behaviour when capturing the entire screen where some parts were
 redrawn while the 60fps application shows the very same pixels. The PTS
 timestamps from the Apple provided sample buffers show different values in
 these cases. Thus I think that it is not the case that ffmpeg is loosing
 frames for latency somewhere.

 To prove this assumption, another capture of more than one 60fps
 application should be helpful. Is this application you're using somehting
 I can download for free somewhere (are you actually playing or is it a
 self-running demo)? I would like to capture it next to PixelToy to be sure
 that there is nothing more we could do here.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 As per Thilo's request I'm posting my test results for his mirror here.
 This is what I got:
 https://www.dropbox.com/s/apkdhi4liixgdl8/avf2.tar.xz?dl=0

 Full console outputs included in the archive.

 Some observations:

 * Recording now forces my device's sample rate to max, which is 192,000
 Hz.  I'm using Soundflower (2ch) for audio and usually leave it at 48,000.
 * Audio is just all static, probably due to the sample rate thing,
 although when I use `-ar 48000` it's still static.
 * The audio/video queue warning messages are gone.
 * Frame rate capture seems unaffected.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 I recorded more examples that compare the current git master to the patch:
 https://www.dropbox.com/s/p3na7szw6d8ds9r/PatchComparison.tar.xz?dl=0

 You'll notice that the audio plays correctly in the patched version, but
 video behaves the same.  Commands and outputs are in the archive for each.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  1
 Blocking:   |
Analyzed by developer:  0|
-+-
Changes (by thilo.borgmann):

 * reproduced:  0 => 1


Comment:

 I can reproduce it. There are missing frames and duplicated frames during
 my testing. However, I'm still not sure what causes these drops.

 If I understand it correctly, the patch sent does not fix the issue even
 partially. I will have a look at it and review it on the ML asap. And I
 will look at #4463 again and see what this patch achieves there.

 So, LordHDL, you possess the ScreenFlow software and it captures the very
 same resolution at the very same framerate with unique frames?
 Can you link to another software capable of that, maybe one that's open-
 source (or at least free)?

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 Unfortunately I will be offline for the whole weekend so maybe mateo can
 comment on how the patch work for him. If it just fixes an audio issue
 (got a ticket for that?), then it might help with that but does not fix
 this issue.

 Still I wonder if the FFmpeg side causes the frame drops or if we never
 come to see these frames and Apple drops them.

 I will also need some more time to review the patch on the ml.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 I'm hoping it's not a rooted issue in AV Foundation itself.  As I said
 before, recordings in Windows do not exhibit the drops (on the same
 hardware).  I know OS X is capable of perfectly smooth capture, as
 evidenced by the recording app ScreenFlow, so it's not a limitation of the
 OS so much as something janky in the software somewhere.

 The audio bug ticket is #4463.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 What option am I supposed to use with `git am`?  This is my first time
 using this command.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 Use:

 {{{git apply ../patches/avf.patch}}}

 If you further want it to be committed to your local repository:

 {{{git add libavdevice/avfoundation.m}}}
 {{{git commit -m avf patch}}}

 Then {{{git log -1}}} shows you your patch to be the last change.
 The avf.patch is just a copypaste from the mail on ffmpeg-devel.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 You can validate that your patch is applied if you lastly type:
 {{{git diff}}}

 The output you get should look (almost) similar to the patch file.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 I've never applied patches in this manner before so I'm not actually sure
 how to do it.  Could you give me a brief rundown?

 Additionally as I said in comment 6, this issue does also happen with the
 default 30 FPS.  I initially thought it was specific to 60 but it happens
 regardless.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 Briefly:

 You might want to do it in a seperate branch, so create one with {{{git
 branch}}},
 next you apply the patch file with {{{git am}}}.
 Then you rerun {{{configure}}} and {{{make}}}.
 After that you can test the new behaviour.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 You might use {{{git am  file.patch}}}.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 That does nothing for me.  I'm not a git expert so I'm likely just doing
 it wrong.  Can you give an example of how that is supposed to look?

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by mateo):

 A patch has been sent to the mailing list [1], however it does not get rid
 of the issue but might help a bit. I beleive the issue is on the
 avfoundation side as the screen recording feature might not be in sync
 with the display (or the display compositor might not be able to stay at a
 constant 60fps ?).

 Can you try the patch and let me know if it improves a bit your issue ?
 ffmpeg will output a warning if a drop happens on the avdevice side.

 [1] http://ffmpeg.org/pipermail/ffmpeg-devel/2015-August/177845.html

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by LordHDL):

 New test with patch:
 https://www.dropbox.com/s/wbp01bcxhrrauxi/AVFTest.tar.xz?dl=0

 Ignore the registration prompt (click outside or the X), it's not needed
 to download.

 The source chosen is a recent PC game (not emulated, low CPU  GPU
 demands) so it runs at 60 FPS exactly as opposed to older standards like
 59.94.  Drops in smoothness are very obvious.  The patch does seem to help
 with the audio tempo issue I've experienced, however.  It doesn't seem to
 cut off or warp anymore.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by mateo):

 Replying to [comment:14 thilo.borgmann]:
  Thanks for your patch, mateo!
 
  If you extend your buffer size to way bigger than 4 frames you should be
 able to see if your assumptions are correct and we just do not consume the
 frames fast enough (and your buffer warning occurs later).

 While testing the patch, ffmpeg did not output the new warning telling the
 user that a frame is being dropped because the queue is full while still
 seeing the issue on the output file (what LordHDL has described / what is
 mentionned in the commit message).

 
  Otherwise, if there is something out of sync on the system-side, your
 buffering extension could be useless and memory requirements raise. In
 that case we have to figure out if we can somehow acquire these missing
 frames in any way or if we don't even have a chance.

 I've tried to set the setAlwaysDiscardsLateVideoFrames to NO but it was
 leading to a performance decrease, ie: the capture was running at 54fps
 instead of 60.

 I also experience the same issue using gstreamer.

 Anyway, I don't think the buffering extension is useless as the new code
 reduce the locking area and give more guarantee that in case of a sudden
 slowdown we don't drop any frames (unless the queue gets full). If the
 memory requirements raise is an issue i can reduce the default queue size.
 Even add an option to configure it.
 What do you think ?

 [...]

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-

Comment (by thilo.borgmann):

 Thanks for your patch, mateo!

 If you extend your buffer size to way bigger than 4 frames you should be
 able to see if your assumptions are correct and we just do not consume the
 frames fast enough (and your buffer warning occurs later).

 Otherwise, if there is something out of sync on the system-side, your
 buffering extension could be useless and memory requirements raise. In
 that case we have to figure out if we can somehow acquire these missing
 frames in any way or if we don't even have a chance.

 I'm eager to hear feedback on the patch from LordHDL.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
--+
 Reporter:  LordHDL   |Owner:  mateo
 Type:  defect|   Status:  open
 Priority:  normal|Component:  avdevice
  Version:  git-master|   Resolution:
 Keywords:  avfoundation  |   Blocked By:
 Blocking:|  Reproduced by developer:  0
Analyzed by developer:  0 |
--+

Comment (by LordHDL):

 I increased the bounty for this.  Let me know if you could use any other
 tests or information from my part.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
-+-
 Reporter:  LordHDL  |Owner:  mateo
 Type:  defect   |   Status:  open
 Priority:  normal   |Component:  avdevice
  Version:  git-master   |   Resolution:
 Keywords:   |   Blocked By:
  avfoundation bounty|  Reproduced by developer:  0
 Blocking:   |
Analyzed by developer:  0|
-+-
Changes (by llogan):

 * keywords:  avfoundation = avfoundation bounty


Comment:

 Bountysource link:
 https://www.bountysource.com/issues/10804663-avfoundation-recording-has-
 consistent-intermittent-frame-drops

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
--+
 Reporter:  LordHDL   |Owner:  mateo
 Type:  defect|   Status:  open
 Priority:  normal|Component:  avdevice
  Version:  git-master|   Resolution:
 Keywords:  avfoundation  |   Blocked By:
 Blocking:|  Reproduced by developer:  0
Analyzed by developer:  0 |
--+

Comment (by LordHDL):

 Just an update to say that I've added a bounty to this on Bountysource;
 I'm still interested in a fix for this.

 I also have recent videos here:
 https://www.dropbox.com/s/0ovhm3h3dl1fhx9/Tests.tar.xz?dl=0

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
--+
 Reporter:  LordHDL   |Owner:  mateo
 Type:  defect|   Status:  open
 Priority:  normal|Component:  avdevice
  Version:  git-master|   Resolution:
 Keywords:  avfoundation  |   Blocked By:
 Blocking:|  Reproduced by developer:  0
Analyzed by developer:  0 |
--+

Comment (by mateo):

 I'll take another look at the issue in one week as I won't have access to
 a mac until then (and if no one fixes the issue).

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
--+
 Reporter:  LordHDL   |Owner:  mateo
 Type:  defect|   Status:  open
 Priority:  normal|Component:  avdevice
  Version:  git-master|   Resolution:
 Keywords:  avfoundation  |   Blocked By:
 Blocking:|  Reproduced by developer:  0
Analyzed by developer:  0 |
--+

Comment (by LordHDL):

 Here's a test without the `-vf` option:
 https://www.dropbox.com/s/a982jatnw7n6d45/nofilter.tar.xz?dl=0

 I didn't include the lossless recording since, even compressed via xz, my
 connection is far too slow to upload within a reasonable time.  But you
 can get the idea from the encoded video and included Terminal outputs.
 I'm actually surprised the recording is using that much CPU.  I thought
 lossless was supposed to be more taxing on disk write speed, while
 compression depends more on CPU?

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
--+
 Reporter:  LordHDL   |Owner:  mateo
 Type:  defect|   Status:  open
 Priority:  normal|Component:  avdevice
  Version:  git-master|   Resolution:
 Keywords:  avfoundation  |   Blocked By:
 Blocking:|  Reproduced by developer:  0
Analyzed by developer:  0 |
--+
Changes (by mateo):

 * cc: matthieu.bouron@… (added)
 * owner:   = mateo
 * status:  new = open


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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
--+
 Reporter:  LordHDL   |Owner:  mateo
 Type:  defect|   Status:  open
 Priority:  normal|Component:  avdevice
  Version:  git-master|   Resolution:
 Keywords:  avfoundation  |   Blocked By:
 Blocking:|  Reproduced by developer:  0
Analyzed by developer:  0 |
--+

Comment (by LordHDL):

 Replying to [comment:1 thilo.borgmann]:
  Please provide the full uncut console output of the command you show to
 reproduce this behaviour.
 
  What device is it, you are capturing from?

 The full output is in the attached text file.  Capture screen 0 is the
 selected device.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
--+
 Reporter:  LordHDL   |Owner:  mateo
 Type:  defect|   Status:  open
 Priority:  normal|Component:  avdevice
  Version:  git-master|   Resolution:
 Keywords:  avfoundation  |   Blocked By:
 Blocking:|  Reproduced by developer:  0
Analyzed by developer:  0 |
--+

Comment (by thilo.borgmann):

 I cannot reproduce with libx264rgb...

 Please strip the command line / features down to the minimum required to
 trigger these frameskips you're reporting. Try a different internal video
 codec an/or raw video and to skip the crop filter.

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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
--+
 Reporter:  LordHDL   |Owner:  mateo
 Type:  defect|   Status:  open
 Priority:  normal|Component:  avdevice
  Version:  git-master|   Resolution:
 Keywords:  avfoundation  |   Blocked By:
 Blocking:|  Reproduced by developer:  0
Analyzed by developer:  0 |
--+

Comment (by mateo):

 I'm not able to reproduce the issue either.
 What is your OSX version ? Maybe the CPU is the bottleneck at some point.
 Is your machine under heavy load ?

--
Ticket URL: https://trac.ffmpeg.org/ticket/4437#comment:5
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Re: [FFmpeg-trac] #4437(avdevice:open): AVFoundation recording has consistent intermittent frame drops

[FFmpeg]

#4437: AVFoundation recording has consistent intermittent frame drops
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 Reporter:  LordHDL   |Owner:  mateo
 Type:  defect|   Status:  open
 Priority:  normal|Component:  avdevice
  Version:  git-master|   Resolution:
 Keywords:  avfoundation  |   Blocked By:
 Blocking:|  Reproduced by developer:  0
Analyzed by developer:  0 |
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Comment (by LordHDL):

 I'm on 10.10.2.  My CPU usage is around 15-18% while recording.  I have an
 i7 2720QM 2.2 GHz and a Radeon 6750M (MacBook Pro 8,2).  As I said in my
 notes, the drops don't happen when recording with ffmpeg in Windows on the
 same hardware.  On OS X the drops also happen when using huffyuv.

 Also I know I specified 60 FPS but this happens even if I don't use the
 `-framerate` option.  The recording defaults to 30 FPS and will still
 exhibit the intermittent drops.  The only time hardware appears to be a
 bottleneck is if I don't use the crop filter and record full screen.

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Ticket URL: https://trac.ffmpeg.org/ticket/4437#comment:6
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