[FFmpeg-devel] AC3 decoding throws error number -16976906 ... vlc plays well

[Mahesh Velankar]

I have got a mpeg ts file with following composition (shown by ffprobe)

ffprobe version N-109444-geef763c705 Copyright (c) 2007-2022 the FFmpeg
developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --enable-openssl
  libavutil      57. 43.100 / 57. 43.100
  libavcodec     59. 55.103 / 59. 55.103
  libavformat    59. 34.102 / 59. 34.102
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 53.100 /  8. 53.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
[mpegts @ 0x56201c2c1cc0] Could not find codec parameters for stream 1
(Audio: ac3 ([129][0][0][0] / 0x0081), stereo, fltp): unspecified sample
rate
Consider increasing the value for the 'analyzeduration' (0) and 'probesize'
(5000000) options
Input #0, mpegts, from 'ff_vlc.ts':
  Duration: 00:10:00.02, start: 1.400000, bitrate: 1839 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
  Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
yuv420p(tv, bt709, progressive), 856x480 [SAR 320:321 DAR 16:9], 30 fps,
59.94 tbr, 90k tbn
  Stream #0:1[0x101](spa): Audio: ac3 ([129][0][0][0] / 0x0081), stereo,
fltp
--------------------------------------------------
I intend to transcode this so that I copy the video as  it is but the audio
will be encoded to aac ...so that I can play it in the browser.

I use the following ffmpeg command to attempt that

ffmpeg -i ff_vlc.ts -vcodec copy -acodec aac -map 0:v:0 -map 0:a:0
ff_vlc_2.ts

this throws errors with -16976906 as follows..........( I have clipped the
repetitive excessively long output)

ffmpeg -i ff_vlc.ts -vcodec copy -acodec aac -map 0:v:0 -map 0:a:0
ff_vlc_2.ts
ffmpeg version N-109444-geef763c705 Copyright (c) 2000-2022 the FFmpeg
developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --enable-openssl
  libavutil      57. 43.100 / 57. 43.100
  libavcodec     59. 55.103 / 59. 55.103
  libavformat    59. 34.102 / 59. 34.102
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 53.100 /  8. 53.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
[mpegts @ 0x55b4369b2440] Could not find codec parameters for stream 1
(Audio: ac3 ([129][0][0][0] / 0x0081), stereo, fltp): unspecified sample
rate
Consider increasing the value for the 'analyzeduration' (0) and 'probesize'
(5000000) options
Input #0, mpegts, from 'ff_vlc.ts':
  Duration: 00:10:00.02, start: 1.400000, bitrate: 1839 kb/s
  Program 1
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
  Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
yuv420p(tv, bt709, progressive), 856x480 [SAR 320:321 DAR 16:9], 30 fps,
59.94 tbr, 90k tbn
  Stream #0:1[0x101](spa): Audio: ac3 ([129][0][0][0] / 0x0081), stereo,
fltp
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (ac3 (native) -> aac (native))
Press [q] to stop, [?] for help
Error while decoding stream #0:1: Error number -16976906 occurred
    Last message repeated 17065 times
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Error while decoding stream #0:1: Error number -16976906 occurred
    Last message repeated 2 times
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Error while decoding stream #0:1: Error number -16976906 occurred
    Last message repeated 2 times
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Error while decoding stream #0:1: Error number -16976906 occurred
    Last message repeated 2 times
....
....
....(repetitive output clipped and removed)
....
....
    Last message repeated 2 times
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Error while decoding stream #0:1: Error number -16976906 occurred
    Last message repeated 2 times
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Error while decoding stream #0:1: Error number -16976906 occurred
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
Too many packets buffered for output stream 0:0.
Error submitting a packet to the muxer for output stream #0:0.
[abuffer @ 0x56289e5ab100] Value inf for parameter 'time_base' out of range
[0 - 2.14748e+09]
    Last message repeated 1 times
[abuffer @ 0x56289e5ab100] Error setting option time_base to value 1/0.
[graph_0_in_0_1 @ 0x5628a3f5e800] Error applying options to the filter.
Error reinitializing filters!
Error while filtering: Numerical result out of range
Finishing stream 0:1 without any data written to it.
[abuffer @ 0x56289b2b89c0] Value inf for parameter 'time_base' out of range
[0 - 2.14748e+09]
    Last message repeated 1 times
[abuffer @ 0x56289b2b89c0] Error setting option time_base to value 1/0.
[graph_0_in_0_1 @ 0x56289a63e780] Error applying options to the filter.
Error configuring filter graph
Conversion failed!
--------------------------------------------------
I tried the above even with this command
ffmpeg -analyzeduration 2147483647 -probesize 2147483647 -i ff_vlc.ts
-vcodec copy -acodec aac -map 0:v:0 -map 0:a:0 ff_vlc_2.ts
Still get the same errors. Only changed lines in the output are
[mpegts @ 0x55e1b757d580] Failed to allocate buffers for seekback
[mpegts @ 0x55e1b757d580] Could not find codec parameters for stream 1
(Audio: ac3 ([129][0][0][0] / 0x0081), stereo, fltp): unspecified sample
rate
Consider increasing the value for the 'analyzeduration' (2147483647) and
'probesize' (2147483647) options
--------------------------------------------------
VLC player has no problems in playing this audio ... only ffmpeg cannot
decode.

How do I fix this?

Please help
Thanks