Hi Moritz,
Many thanks for the detailed response.
>> I am helping build a node server that runs ffmpeg to stream a live
>> WebRTC input to HLS and MPEGDASH. Often when the encoding starts it
>> produces a corrupted video output that looks something like this
>> (viewed using VLC):
>
> Are you saying that after a few frames the video becomes correct?
No, once it starts “bad", it stays “bad".
>> Does anyone have any ideas on what might cause this type of
>> distortion on the output stream or how I can test further to track it
>> down?
>
> To see what ffmpeg is doing with your input, it would have been helpful
> to look at ffmpeg's complete log output. But:
>
>> ffmpeg -re -y -loglevel error -hide_banner
>
> Without "-loglevel error" and without "-hide_banner" please.
I’ve attached the stout produced from ffmpeg when the issue is occurring with
just those options removed. I don’t see any issues there so I am thinking you
may be right about it being an issue with the Web RTC input.
ffmpeg version 3.4.6 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.11) 20160609
configuration: --disable-debug --disable-doc --disable-ffplay
--enable-shared --enable-avresample --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-gpl --enable-libass --enable-libfreetype
--enable-libvidstab --enable-libmp3lame --enable-libopenjpeg --enable-libopus
--enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp
--enable-libx265 --enable-libxvid --enable-libx264 --enable-nonfree
--enable-openssl --enable-libfdk_aac --enable-libkvazaar --enable-postproc
--enable-small --enable-version3 --extra-cflags=-I/opt/ffmpeg/include
--extra-ldflags=-L/opt/ffmpeg/lib --extra-libs=-ldl --prefix=/opt/ffmpeg
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
info: Received: ice
info: Received: ice
info: Ice candidate added
info: Ice candidate added
Input #0, rawvideo, from 'tcp://127.0.0.1:43455':
Duration: N/A, start: 1568117517.228372, bitrate: 110592 kb/s
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480, 110592
kb/s, 30 tbr, 30 tbn, 30 tbc
Input #1, mp3, from 'tcp://127.0.0.1:35403':
Duration: N/A, start: 0.000000, bitrate: 192 kb/s
Stream #1:0
: Audio: mp3, 48000 Hz, mono, s16p, 192 kb/s
Stream mapping:
Stream #0:0 (rawvideo) -> format (graph 0)
Stream #0:0 (rawvideo) -> format (graph 1)
scale (graph 0) -> Stream #0:0 (libx264)
Stream #1:0 -> #0:1 (mp3 (native) -> aac (native))
scale (graph 1) -> Stream #0:2 (libx264)
Stream #1:0 -> #0:3 (mp3 (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0xad76e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
FMA3 AVX2 LZCNT BMI2
[libx264 @ 0xad76e0] profile High, level 1.3
[libx264 @ 0xad76e0] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft
2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=1
deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00
mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11
fast_pskip=1 chroma_qp_offset=0 threads=7 lookahead_threads=1 sliced_threads=0
nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=1
b_pyramid=0 b_adapt=0 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1
keyint=48 keyint_min=25 scenecut=0 intra_refresh=0 rc_lookahead=10 rc=crf
mbtree=1 crf=22.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=749
vbv_bufsize=1050 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
[libx264 @ 0xadc1a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
FMA3 AVX2 LZCNT BMI2
[libx264 @ 0xadc1a0] profile High, level 3.0
[libx264 @ 0xadc1a0] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft
2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=1
deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00
mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11
fast_pskip=1 chroma_qp_offset=0 threads=9 lookahead_threads=2 sliced_threads=0
nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=1
b_pyramid=0 b_adapt=0 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1
keyint=48 keyint_min=25 scenecut=0 intra_refresh=0 rc_lookahead=10 rc=crf
mbtree=1 crf=22.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=749
vbv_bufsize=1050 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/init-stream0.m4s' for
writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/init-stream1.m4s' for
writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/init-stream2.m4s' for
writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/init-stream3.m4s' for
writing
Output #0, dash, to '/usr/src/app/cdn-path/mpd/webrtc_test.mpd':
Metadata:
encoder : Lavf57.83.100
Stream #0:0: Video: h264 (libx264), yuv420p(progressive), 320x240, q=-1--1,
400 kb/s, 30 fps, 983041.00 tbn, 30 tbc
Metadata:
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 749000/0/400000 buffer size: 1050000
vbv_delay: -1
Stream #0:1: Audio: aac, 48000 Hz, mono, fltp, 64 kb/s
Metadata:
encoder : Lavc57.107.100 aac
Stream #0:2: Video: h264 (libx264), yuv420p(progressive), 480x360,
q=-1--1, 700 kb/s, 30 fps, 983041.00 tbn, 30 tbc
Metadata:
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 749000/0/700000 buffer size: 1050000
vbv_delay: -1
Stream #0:3: Audio: aac, 48000 Hz, mono, fltp, 96 kb/s
Metadata:
encoder : Lavc57.107.100 aac
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
Past duration 0.999992 too large
Last message repeated 3 times
frame= 53 fps=0.0 q=28.0 q=28.0 size=N/A time=00:00:01.06 bitrate=N/A dup=90
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frame= 113 fps= 45 q=28.0 q=28.0 size=N/A time=00:00:03.06 bitrate=N/A dup=180
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[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream0-00001.m4s.tmp' for writing
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream1-00001.m4s.tmp' for writing
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream3-00001.m4s.tmp' for writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream2-00001.m4s.tmp' for writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
frame= 129 fps= 43 q=28.0 q=28.0 size=N/A time=00:00:03.59 bitrate=N/A dup=196
drop=12 speed=1.19x
frame= 144 fps= 41 q=28.0 q=28.0 size=N/A time=00:00:04.09 bitrate=N/A dup=210
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frame= 158 fps= 39 q=25.0 q=26.0 size=N/A time=00:00:04.56 bitrate=N/A dup=222
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frame= 174 fps= 38 q=28.0 q=31.0 size=N/A time=00:00:05.09 bitrate=N/A dup=236
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frame= 189 fps= 37 q=28.0 q=31.0 size=N/A time=00:00:05.59 bitrate=N/A dup=238
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drop=12 speed= 1.1x
[dash @ 0xad6260] Opening
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[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream1-00002.m4s.tmp' for writing
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream3-00002.m4s.tmp' for writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream2-00002.m4s.tmp' for writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
frame= 220 fps= 36 q=28.0 q=28.0 size=N/A time=00:00:06.63 bitrate=N/A dup=238
drop=12 speed= 1.1x
frame= 235 fps= 36 q=28.0 q=28.0 size=N/A time=00:00:07.13 bitrate=N/A dup=238
drop=12 speed=1.09x
frame= 250 fps= 35 q=28.0 q=28.0 size=N/A time=00:00:07.63 bitrate=N/A dup=238
drop=12 speed=1.08x
frame= 265 fps= 35 q=28.0 q=28.0 size=N/A time=00:00:08.13 bitrate=N/A dup=238
drop=12 speed=1.08x
frame= 280 fps= 35 q=28.0 q=28.0 size=N/A time=00:00:08.63 bitrate=N/A dup=238
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frame= 295 fps= 34 q=28.0 q=28.0 size=N/A time=00:00:09.13 bitrate=N/A dup=238
drop=12 speed=1.07x
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream0-00003.m4s.tmp' for writing
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream1-00003.m4s.tmp' for writing
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'/usr/src/app/cdn-path/mpd/chunk-stream3-00003.m4s.tmp' for writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream2-00003.m4s.tmp' for writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
frame= 310 fps= 34 q=28.0 q=28.0 size=N/A time=00:00:09.63 bitrate=N/A dup=238
drop=12 speed=1.06x
frame= 325 fps= 34 q=28.0 q=28.0 size=N/A time=00:00:10.13 bitrate=N/A dup=238
drop=12 speed=1.06x
frame= 341 fps= 34 q=28.0 q=28.0 size=N/A time=00:00:10.66 bitrate=N/A dup=238
drop=12 speed=1.06x
Past duration 0.999992 too large
Last message repeated 9 times
frame= 356 fps= 34 q=28.0 q=28.0 size=N/A time=00:00:11.16 bitrate=N/A
dup=238 drop=12 speed=1.05x
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Last message repeated 27 times
frame= 371 fps= 33 q=28.0 q=28.0 size=N/A time=00:00:11.66 bitrate=N/A
dup=238 drop=12 speed=1.05x
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Last message repeated 29 times
frame= 386 fps= 33 q=28.0 q=28.0 size=N/A time=00:00:12.16 bitrate=N/A
dup=238 drop=12 speed=1.05x
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frame= 401 fps= 33 q=28.0 q=28.0 size=N/A time=00:00:12.66 bitrate=N/A
dup=238 drop=12 speed=1.05x
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Last message repeated 9 times
[dash @ 0xad6260] Opening
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[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream2-00004.m4s.tmp' for writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
Past duration 0.999992 too large
Last message repeated 17 times
frame= 416 fps= 33 q=28.0 q=28.0 size=N/A time=00:00:13.16 bitrate=N/A
dup=238 drop=12 speed=1.04x
Past duration 0.999992 too large
Last message repeated 21 times
frame= 431 fps= 33 q=28.0 q=28.0 size=N/A time=00:00:13.66 bitrate=N/A
dup=238 drop=12 speed=1.04x
Past duration 0.999992 too large
Last message repeated 29 times
frame= 446 fps= 33 q=25.0 q=25.0 size=N/A time=00:00:14.16 bitrate=N/A
dup=238 drop=12 speed=1.04x
Past duration 0.999992 too large
Last message repeated 19 times
frame= 461 fps= 33 q=28.0 q=28.0 size=N/A time=00:00:14.66 bitrate=N/A
dup=238 drop=12 speed=1.04x
Past duration 0.999992 too large
Last message repeated 19 times
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dup=238 drop=12 speed=1.04x
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Last message repeated 3 times
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dup=238 drop=12 speed=1.04x
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Last message repeated 1 times
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream0-00005.m4s.tmp' for writing
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[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream2-00005.m4s.tmp' for writing
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writing
Past duration 0.999992 too large
Last message repeated 3 times
frame= 506 fps= 32 q=28.0 q=28.0 size=N/A time=00:00:16.16 bitrate=N/A
dup=238 drop=12 speed=1.03x
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Last message repeated 1 times
frame= 522 fps= 32 q=28.0 q=28.0 size=N/A time=00:00:16.69 bitrate=N/A
dup=238 drop=12 speed=1.03x
frame= 537 fps= 32 q=28.0 q=28.0 size=N/A time=00:00:17.19 bitrate=N/A dup=238
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[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
[dash @ 0xad6260] Opening
'/usr/src/app/cdn-path/mpd/chunk-stream2-00006.m4s.tmp' for writing
[dash @ 0xad6260] Opening '/usr/src/app/cdn-path/mpd/webrtc_test.mpd.tmp' for
writing
frame= 613 fps= 32 q=28.0 q=28.0 size=N/A time=00:00:19.73 bitrate=N/A dup=238
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writing
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writing
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frame= 794 fps= 31 q=28.0 q=28.0 size=N/A time=00:00:25.76 bitrate=N/A dup=238
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If you do spot anything "interesting" please let me know.
> To see whether the input is at fault, you would strip all the output
> magic and just dump a few seconds to file, by keeping all the input
> options, but just writing a simple file, for example:
>
> $ ffmpeg { input options } -map 0:v -map 1:a -t 5 testout.mp4
>
> to check whether the same effects are to be seen in that file.
Yes, I’ll try this - but because it’s all being run programmatically using
nodeJS it will take me a little while to make the code so that all commands are
running under the same conditions.
>> ffmpeg version 3.4.6 Copyright (c) 2000-2019 the FFmpeg developers
>
> Though it probably isn't part of your issue, we always recommend to
> test (or even use) a very recent version of ffmpeg. This rules out
> debugging fixed bugs. If you can't find a newer ffmpeg in some other
> repository, and you don't want to build yourself, you can grab a static
> binary from here and test with that:
>
> https://johnvansickle.com/ffmpeg/
>
> (Left column, "git master", please.)
Yes - again this is inside a docker build so it will take a little while to
bring it up to date, but if it is looking like ffmpeg is the issue then I’ll
give it a go.
Thank you
Ben
> On 10 Sep 2019, at 10:41, Moritz Barsnick <[email protected]> wrote:
>
> Hi Ben,
>
> On Tue, Sep 10, 2019 at 06:09:30 +0100, Ben Houghton wrote:
>> I am helping build a node server that runs ffmpeg to stream a live
>> WebRTC input to HLS and MPEGDASH. Often when the encoding starts it
>> produces a corrupted video output that looks something like this
>> (viewed using VLC):
>
> Are you saying that after a few frames the video becomes correct?
>
>> HLS output distorted image <https://i.stack.imgur.com/Dxx03.png>
>> MPEGDASH output distorted image <https://i.stack.imgur.com/9YQri.png>
>
> This doesn't look like an encoding error by ffmpeg, but it could be a
> decoding artifact. In particular if the first frame is not a keyframe
> or just partially received. There's possibly nothing you can do,
> because that's the way the stream is initially picked up. (Just
> guessing so far.)
>
>> Does anyone have any ideas on what might cause this type of
>> distortion on the output stream or how I can test further to track it
>> down?
>
> To see what ffmpeg is doing with your input, it would have been helpful
> to look at ffmpeg's complete log output. But:
>
>> ffmpeg -re -y -loglevel error -hide_banner
>
> Without "-loglevel error" and without "-hide_banner" please.
>
> To see whether the input is at fault, you would strip all the output
> magic and just dump a few seconds to file, by keeping all the input
> options, but just writing a simple file, for example:
>
> $ ffmpeg { input options } -map 0:v -map 1:a -t 5 testout.mp4
>
> to check whether the same effects are to be seen in that file.
>
>> ffmpeg version 3.4.6 Copyright (c) 2000-2019 the FFmpeg developers
>
> Though it probably isn't part of your issue, we always recommend to
> test (or even use) a very recent version of ffmpeg. This rules out
> debugging fixed bugs. If you can't find a newer ffmpeg in some other
> repository, and you don't want to build yourself, you can grab a static
> binary from here and test with that:
>
> https://johnvansickle.com/ffmpeg/
>
> (Left column, "git master", please.)
>
> Regards,
> Moritz
> _______________________________________________
> ffmpeg-user mailing list
> [email protected]
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> [email protected] with subject "unsubscribe".
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