[FFmpeg-user] ac3 frame sync errors mpegts->webm chunks

Wed Aug 3 17:44:49 EEST 2016

Oh, my apologies, I got the same behavior with head - posted the wrong
results. Here are those results:

This is a live stream from an old HDHomerun tuner speaking mpegts ; the
input isn't perfect but if I capture to a local .ts file it is in good
enough shape to play back, but I get the same results when encoding with
these settings from the local file.

Note that I've updated the stream mapping so that I'm sure that I'm getting
the right audio stream.

Is there a way that I can get better output about the ac3 issue?

*Invocation*
bin/hdhomerun_config 10391104 save /tuner0 - | /home/sam/bin/ffmpeg -i - *-map
i:0x31* -pix_fmt yuv420p -c:v libvpx-vp9 -s 640x360 -keyint_min 60 -g 60
-speed 6 -tile-columns 4 -frame-parallel 1 -threads 8 -static-thresh 0
-max-intra-rate 300 -deadline realtime -lag-in-frames 0 -error-resilient 1
-b:v 1000k -f webm_chunk -header /var/www/html/webm_live/tuner_720.hdr
-chunk_start_index 1 /var/www/html/webm_live/tuner_720_%d.chk *-map i:0x34*
-c:a libvorbis -b:a 128k -af 'pan=stereo|c0=FL|c1=FR' -f webm_chunk
-audio_chunk_duration 2000 -header /var/www/html/webm_live/tuner_128.hdr
-chunk_start_index 1 /var/www/html/webm_live/tuner_128_%d.chk

*Output*
ffmpeg version N-81210-gfd4eb56 Copyright (c) 2000-2016 the FFmpeg
developers
  built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-7)
  configuration: --prefix=/home/sam/ffmpeg_build
--extra-cflags=-I/home/sam/ffmpeg_build/include
--extra-ldflags=-L/home/sam/ffmpeg_build/lib --bindir=/home/sam/bin
--pkg-config-flags=--static --enable-gpl --enable-nonfree
--enable-libfdk-aac --enable-libfreetype --enable-libmp3lame
--enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
--enable-libx265
  libavutil      55. 28.100 / 55. 28.100
  libavcodec     57. 51.100 / 57. 51.100
  libavformat    57. 44.100 / 57. 44.100
  libavdevice    57.  0.102 / 57.  0.102
  libavfilter     6. 49.100 /  6. 49.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  1.100 /  2.  1.100
  libpostproc    54.  0.100 / 54.  0.100
[mpeg2video @ 0x2ed2980] Invalid frame dimensions 0x0.
...    Last message repeated 7 times
Input #0, mpegts, from 'pipe:':
  Duration: N/A, start: 91280.195389, bitrate: N/A
  Program 3
    Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv), 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, 29.97 fps,
29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x34](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
5.1(side), fltp, 384 kb/s
    Stream #0:2[0x35](spa): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
stereo, fltp, 96 kb/s
[Parsed_pan_0 @ 0x33278c0] Pure channel mapping detected: 0 1
[libvpx-vp9 @ 0x2eca240] v1.6.0
[webm_chunk @ 0x3075880] Using AVStream.codec to pass codec parameters to
muxers is deprecated, use AVStream.codecpar instead.
[webm_chunk @ 0x2ecae40] Using AVStream.codec to pass codec parameters to
muxers is deprecated, use AVStream.codecpar instead.
Output #0, webm_chunk, to '/var/www/html/webm_live/tuner_720_%d.chk':
  Metadata:
    encoder         : Lavf57.44.100
    Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p, 640x360 [SAR 1:1 DAR
16:9], q=-1--1, 1000 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc57.51.100 libvpx-vp9
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Output #1, webm_chunk, to '/var/www/html/webm_live/tuner_128_%d.chk':
  Metadata:
    encoder         : Lavf57.44.100
    Stream #1:0(eng): Audio: vorbis (libvorbis), 48000 Hz, stereo, fltp,
128 kb/s
    Metadata:
      encoder         : Lavc57.51.100 libvorbis
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg2video (native) -> vp9 (libvpx-vp9))
  Stream #0:1 -> #1:0 (ac3 (native) -> vorbis (libvorbis))
[ac3 @ 0x2ed6060] frame sync error
Error while decoding stream #0:1: Invalid data found when processing input

On Wed, Aug 3, 2016 at 4:16 AM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> On Tuesday 02 August 2016 05:21:02 am you wrote:
> > ffmpeg version 2.8.7 Copyright (c) 2000-2016 the FFmpeg developers
>
> Generally, you are expected to test current FFmpeg git head before
> reporting issues here: We cannot fix issues in the version you are testing.
>
> >   built with gcc 4.8.3 (GCC) 20140911 (Red Hat 4.8.3-7)
> >   configuration: --prefix=/home/sam/ffmpeg_build
> > --extra-cflags=-I/home/sam/ffmpeg_build/include
> > --extra-ldflags=-L/home/sam/ffmpeg_build/lib --bindir=/home/sam/bin
> > --pkg-config-flags=--static --enable-gpl --enable-nonfree
> > --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame
> > --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
> > --enable-libx265
> >   libavutil      54. 31.100 / 54. 31.100
> >   libavcodec     56. 60.100 / 56. 60.100
> >   libavformat    56. 40.101 / 56. 40.101
> >   libavdevice    56.  4.100 / 56.  4.100
> >   libavfilter     5. 40.101 /  5. 40.101
> >   libswscale      3.  1.101 /  3.  1.101
> >   libswresample   1.  2.101 /  1.  2.101
> >   libpostproc    53.  3.100 / 53.  3.100
> > [mpeg2video @ 0x3818360] Invalid frame dimensions 0x0.
> > ..    Last message repeated 4 times
> > Input #0, mpegts, from 'pipe:':
> >   Duration: N/A, start: 57912.043678, bitrate: N/A
> >   Program 3
> >     Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
> > yuv420p(tv), 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, max. 90000
> > kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
> >     Stream #0:1[0x34](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
> > 5.1(side), fltp, 384 kb/s
> >     Stream #0:2[0x35](spa): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
> > stereo, fltp, 96 kb/s
> > [libvpx-vp9 @ 0x381b200] v1.6.0
> > Output #0, webm_chunk, to '/var/www/webm_live/tuner_720_%d.chk':
> >   Metadata:
> >     encoder         : Lavf56.40.101
> >     Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p, 1280x720 [SAR 1:1 DAR
> > 16:9], q=-1--1, 3000 kb/s, 29.97 fps, 1k tbn, 29.97 tbc
> >     Metadata:
> >       encoder         : Lavc56.60.100 libvpx-vp9
> > Output #1, webm_chunk, to '/var/www/webm_live/tuner_128_%d.chk':
> >   Metadata:
> >     encoder         : Lavf56.40.101
> >     Stream #1:0(eng): Audio: vorbis (libvorbis), 48000 Hz, 5.1(side),
> fltp,
> > 128 kb/s
> >     Metadata:
> >       encoder         : Lavc56.60.100 libvorbis
> > Stream mapping:
> >   Stream #0:0 -> #0:0 (mpeg2video (native) -> vp9 (libvpx-vp9))
> >   Stream #0:1 -> #1:0 (ac3 (native) -> vorbis (libvorbis))
> > [ac3 @ 0x38117e0] frame sync error
> > Error while decoding stream #0:1: Invalid data found when processing
> input
>
> Is this everything that gets printed on the console? (Is this the last
> line?)
>
> Feel free to provide a sample, generally this error is unavoidable for ts
> input, but encoding should work nonetheless.
>
> Carl Eugen
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