ync is a synchronization tool, and synchronizing without altering
is a very important feature.
> (*) Well, in theory you can use FFmpeg to make a 1:1 copy (-map 0,
> same container), but even then details will usually be different
Add -f data and you will have an exact bina
plaining the details is not in topic for
this mailing-list.
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Ulf Zibis (12024-08-14):
> But for convenience FFmpeg CLI provides option `-y` for this task
No, it does not. The -y option only disables a very simple, unreliable
but convenient safety measure. It does not delete anything.
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ing: the trick
is to get the subtitles into a filter chain, so that ffmpeg converts it
to video: the showinfo filter should be enough to force the conversion.
Also, do not forget -vsync vfr, otherwise the image2 muxer will be
duplicating the frames.
> Le dim. 21 juil. 2024 à 13:57, Nicolas George
video.
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does not read chapters from the concatenated files,
but it can get chapters from the concat script.
In the short term: extract chapters from each input file and use your
favorite language to turn them into lines suitable for the concat
script.
In the long term: patch welcome.
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he gain in size.
1: You might think you can get it with AI, but it only seems better
quality. If you do it too much, like if you are trying to catch the face
of a replicant reflected on a whisky glass, what you will get is bits of
series from Amazon Studios in your videos.
Regard
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d to your needs.
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it to the
authors of pipewire.
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good project to have fun hacking on.
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onsole output.
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ratis and without any warranty?
You are owed nothing here, you are asking for help, so please keep it
civil.
And do not top post.
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To un
bbb (12023-12-04):
> When I try to use mkv it insists on having a
> video stream (... figures).
Hi.
I do not observe that. Please show your command line.
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Mark Filipak (12023-11-13):
> If input PTSs & DTSs shouldn't be changed, then what use is
> '-bsf:v setts=pts=:dts='?
They are for people who know what they are doing.
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lot more, because larger graphs tend to be deeper too.
This is not unavoidable, this part would be rather easy to optimize.
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ly, both Phil and Mark have repeatedly shown they had no
intention of making any effort themselves, their policy is to expect
somebody to do the job for them gratis and insult the project when that
does not happen.
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Descripti
Greg Oliver (12023-10-20):
> I have never used ffprobe before, but I have seen countless messages
> on this left with regards to it not being closely maintained and
> recommendations to use other software to query media information.
It is the other way around.
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file, for which C
compilation do not apply.
> On Tue, Sep 12, 2023 at 5:22 PM Reindl Harald
> wrote:
Top-posting is forbidden on these lists. If you want help, stop doing
it; look it up if you need.
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FFmpeg.
> On Thu, Feb 16, 2023 at 1:44 PM Michael Koch
> wrote:
Top-posting is forbidden on FFmpeg lists; if you do not know what it
means, look it up.
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Michael Koch (12022-11-13):
> I can't find - without any following characters in the FFmpeg or FFplay
> documentation.
This is not specific to FFmpeg:
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html#tag_12_02
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rds people
around you.)
I would also suggest you use a mail software that does not break
threads, but it will not matter much anyway.
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cles, what you describe is not possible on top of being useless. What
happens is just that the second -c:v option will override the first one.
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n't work on these
> files what I can see/implement ... (?)
>
> $ ffmpeg -y -i $src1 -c copy -bsf:v h264_mp4toannexb -f mpegts $dst1
>
> [h264_mp4toannexb @ 0x55c9452bcc80] Codec 'vp9' (167) is not
> supported by the bitstream filter 'h264_mp4toannexb'.
> Suppor
x27;t that, then why?
I suspect some formats just have too complex features to allow for
simple concatenation.
concat is not guaranteed to work with streams that have different
parameters. There is no way around that without transcoding. To
normalize, use the concat filter and transcode.
Sorry
Michael Koch (12022-06-11):
> I always get this error message:
> Stream specifier '' in filtergraph description [0][1]concat=n=2:a=1 matches
> no streams.
Where did you find this "[number]" syntax, and has it ever worked for
you?
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s
han the issue of
international characters.
But you did not tell how exactly you get this output, so I cannot say
more.
I suspect you are missing a lot of theoretical background necessary to
achieve your goals.
> Am 2022-06-03 11:36, schrieb Nicolas George:
Top-posting is forbidden on this mail
utputs.
It seems your problem is that your terminal does not work in UTF-8. But
you did not say which terminal you use, so I cannot help further.
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Cecil Westerhof via ffmpeg-user (12022-05-29):
> I am going to ignore you.
Then I am going to ignore you.
> Before I CAN USE concat I have the create the n cuts I need to put
> into the concat.
And it is easy to do. But do not count on my help.
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De
clear for you: you should not run a script you found on a
random web site, it would be a huge security risk. You need to
understand the script and adapt it to your needs.
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concat scripts:
https://ffmpeg.org/ffmpeg-all.html#concat-1
> > On 2022.0428, at 16:19, Michael Mueck wrote:
Please remember that top-posting is strictly forbidden on this list.
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generate a concat script to access the DVD hierarchy correctly
using the dvd2concat script in the tools directory.
It is entirely possible that doing so would fix your issue.
Also, do not re-encode the subtitles, use -c copy, it will be more
reliable.
Regards,
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not capable of testing this very simple question by
yourself?
(These are rhetorical questions.)
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Gyan Doshi (12022-02-28):
> This has come up before. I'll patch it to make it an interval.
I do not think it is worth your effort: the cost of loading the file is
negligible compared to the rest of the operations.
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sh -c "dmesg" |
zsh: done head -n 1
ssecem ~ $ sh -c "trap '' PIPE; dmesg" | head -n 1
[0.018123] On node 0, zone DMA32: 1580 pages in unavailable ranges
dmesg: write error
zsh: exit 1 sh -c "trap '' PIPE; dm
o get out of
> sync.
The select filter is very generic, and therefore not very robust. It
does not update the timestamps, hence the need to update them
afterwards. Furthermore, it works with whole frames, which can
accumulate for audio.
For your use case, consider the segment and c
sh this?
The pan filter can do that easily.
https://ffmpeg.org/ffmpeg-all.html#pan-1
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ap with the reading.
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es to protect the commas.
I will grant you it is not intuitive and very annoying, but it always
can be made to work.
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argue that MP4 is a crappy format designed with more
concern for pleasing big investors than with concern for good design.
For careful examination of the output, NUT would be the most reliable.
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g-list. Do not do it again if you
want help. Look it up if you do not know what it means.
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perty of the frame, they will be preserved
or converted by filters and storage. Frame numbers are not.
If you have an issue with timestamps, please be more specific about it,
there is no doubt it can be solved.
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it is possible. There are tools to do it with
individual images, look up jpegtran.
But with video codecs that use temporal compression, a visible part of
the next image can depend on a cropped part of the current image, and
that makes it impossible.
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De
Hi.
Is somebody here using the "proto,,option...,,:" feature? I am
considering removing it.
If you do not know what I mean, do not bother, it means you do not.
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tly to see its output.
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le can be more suited, but I never looked at
the specifics.
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Mike Martin (12021-07-16):
> Anyone any ideas what is happening?
No. But you should not be concatenating after transcoding in the first
place. Use the concat filter and encode everything once.
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On Thu, Jul 15, 2021 at 12:02 AM Nicolas George wrote:
... but learn what top-posting means, because it is forbidden here and
you will not get useful help if you do it again.
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you will realize your exact need is somewhat different.
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S. Helbig via ffmpeg-user (12021-07-12):
> I'm wondering if there is a way for FFMPEG to handle click-activates
> streams. I'm just experimenting at the moment.
You are asking if FFmpeg contains a JavaScript engine.
The answer is no.
Regards,
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shell, file
descriptors, redirections, etc., and come back to FFmpeg once this
aspect of the issue is no longer a problem.
For example, anybody skilled enough can tell that the reason "... 2>&1 >
freezeoutput.txt" produces an empty file is that the order of the
redirectio
Christian Ebert (12021-07-09):
> But for writing the log into a file look into ffmpeg's -report option, that's
> what it's for.
You can use it that way, but it is not what it is for.
My advice for this thread: don't try to run before you can walk.
Regards,
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and PNG image files in the same input text file.
That is normal:
# All files must have the same streams (same codecs, same time base,
# etc.).
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to remember. Video encoding is a complex task.
Your advice was sound: for archival, better keep the original. Do not
recompress to gain a measly 25%. But for viewing, adapt the quality
compromise to the viewing conditions.
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top-posting is forbidden on this list. Look it up.
You are unlikely to get further useful help if you do it again.
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https:
much smaller video, and finish much faster too.
Of course, I urge you to check the result to see if it matches your
expectations. And to peruse the documentation to see what these option
would do before doing it.
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De
filter.
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g, nor generic system programming.
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has the same kind of difficulty than https://xkcd.com/1425/'s
check whether the photo is of a bird.
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schrotty (12021-05-02):
> when i say "headless" i mean raspbian lite , without desktop.
This is what people call "text mode" or "console". Headless is when
there is no screen at all.
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Bouke (12021-05-02):
> Ok, but what is ' UTC modulo’ ?
An incomplete formula. Like "UTC minus": UTC minus... what? UTC
modulo... "UTC modulo timestamp_align", as a whole.
Then read:
https://en.wikipedia.org/wiki/Modulo
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ion: "Adjust audio tempo.".
Compare to what was suggested to you:
>> Yes, this is possible with a combination of asetrate, atempo and
>> aresample filters.
You need to start paying attention.
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D
what you tell it to do, it cannot read your mind.
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it reads the content of the CSV (video
> name and credits text) and processes them in a "more or less"
> automatic way?
Not with FFmpeg directly. But FFmpeg is a command-line tool, it plays
well with other command-line tools. You just need to learn how to use
them.
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Michael Koch (12021-04-23):
> The crop filter could be used to change the x,y coordinates, with constant
> output resolution.
With timeline? Please elaborate?
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Gyan Doshi (12021-04-23):
> Strictly, it's supported via -noautoscale (which you reviewed), but it's
> not supported by (almost) any encoder.
No, it is not *supported*, it is a fragile hack.
*Supporting* resolution changes will require a lot more work.
Regards,
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Ulf Zibis (12021-04-23):
> I already had checked that. Unfortunately, crop has no timeline support:
How would that work? Enabling or disabling crop changes the output
resolution, which is not supported by libavfilter.
Regards,
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means to completely remove a broken audio frame.
Certainly not. Fixing in this case means creating a frame packet that
would decode into the same PCM data while not triggering the error.
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uld be plotted
> X: the x-coordinate
> Y: the y=coordinate
> LABEL: label for the point
>
> Also possibly important, there are multiple (many) particles for which
> circles and labels need to be plotted on each frame.
This looks like something ASS subtitles can do eas
ealize that you are wasting your time by ignoring Carl Eugen's
authoritative answer, right?
If you want real help with your problem, start by stopping your
top-posting.
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do. More computing power usually means lower bitrate
for same quality. The keyword is "preset".
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Phil Rhodes via ffmpeg-user (12021-03-29):
> Are you contending that there is no such thing as video at 24000/1001 fps?
Are you capable of understanding a simple phrase made of less ten words?
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Phil Rhodes via ffmpeg-user (12021-03-29):
> What?
I have nothing to add to what I have written. Get a clue.
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frame"); I think
> this is the only place I see things like "3/1001".
Yeah, engineers are no mathematicians. Their bad.
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Phil Rhodes via ffmpeg-user (12021-03-29):
> For the sake of being really rigorously correct, yes, 24.0 or 24000/1001.
Once again, you are wrong. The 1000/1001 factor is an artifact of color
TV.
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rds,
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ave already
explained.
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Ulf Zibis (12021-03-09):
> So for correctness, ffmpeg should report packets instead frames in its
> progress output line, at least with -c copy ... or please correct me.
Would you insist on people saying that the mailman brings envelopes
instead of letters too?
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stream=nb_read_frames
^^^
^^
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ays equal
> frame count? What might be pitfalls with this approach?
The frame count could be different than the packet count with some
codecs, indeed, but I am not aware of any specific case. Anyway, using
-c copy gives the same result.
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u tried telling ffprobe to count
packets?
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but its output is meant for parsing. Your solution will break as soon as
we change a tiny detail in the statistics line.
Show us your complete command line and console output if you have
trouble.
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ervers and include a link.
> . Delete all footers, sigs, other junk before replying.
What makes you think the people who do not read the list guidelines and
FAQ will read the list footer?
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her than being a little ugly, my way seems to yield the correct result
> with any video. I like universal solutions, so I stuck with it, and
> recommended it.
FFprobe yields the correct result, and in a cleaner way. Just use it
properly.
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Descri
Peter White (12021-03-09):
> If anybody on this list knows a better one, step up, please.
ffprobe, of course.
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ht
t the API:
https://lists.ffmpeg.org/mailman/listinfo/libav-user/
And if you expect help, you need to provide a modicum of information.
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t; Have you any suggestions about this strange behaviour?
I am sorry, but I do not think I can help with that: I have no idea what
these numbers are supposed to mean.
In the meantime, I notice that you have not checked if you had buffer
overruns in
e origin of timestamps for that
particular device.
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tion. At least until we have a proper event loop.
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ere no threads are used.
It is entirely possible this flowchart is not up to date or chose to
gloss over implementations details that are not deemed relevant for the
information expressed. The command line tool ffmpeg uses threads for
inputs as soon as there are more than one.
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d video match before encoding?
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Jim DeLaHunt (12021-02-14):
> Oh, my dear Carl
Indeed, you managed to be even more insulting in just four words and
half an hour.
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Nicolas George
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l you want wherever you
want in the graph.
No need to completely split the channels, it was meant for versions that
lack the pan filter.
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Nicolas George
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Chris Angelico (12021-02-02):
> And Phil learned basic courtesy.
You mistake the absence of profanity with courtesy. It is a common
mistake.
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Nicolas George
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ffm
gs based on Sid, or at least testing, is
astounding.
Regards,
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Nicolas George
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ap 1 -map 2 -map 3 -metadata:s:a:0 language=eng -metadata:s:a:1
> language=tam -metadata:s:a:2 language=tel -metadata:s:a:3 language=hin
> -codec copy multilanguage.mp4
>
> However, the output includes only the multiple audio tracks with no
> video (0 kB)
You have not mapped the vid
-December/274171.html
- Event loop
https://ffmpeg.org/pipermail/ffmpeg-devel/2020-December/274172.html
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Nicolas George
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you already are in break of FFmpeg's license;, you need to
delete immediately any binary image built with the --enable-nonfree.
Regards,
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Nicolas George
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