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  • AC3 decoding throws error number -16976906 ... vlc plays well

    23 décembre 2022, par user1940163

    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

    


  • Why Safari does not play mp4 though Chrome plays it ?

    30 octobre 2022, par János

    This mp4 is generated from a gif : https://t44-post-cover.s3.eu-central-1.amazonaws.com/gp2w.mp4

    


    It is playable on Chrom, not on Safari. Why ? What is the problem ?

    


    This is the conversion command :

    


            await new Promise<void>((resolve, reject) => {&#xA;            ffmpeg&#xA;                .input(`/tmp/input_${imgId}.gif`)&#xA;                .outputOptions([&#xA;                    &#x27;-c:v libx264&#x27;,&#xA;                    &#x27;-movflags &#x2B;faststart&#x27;,&#xA;                    &#x27;-movflags frag_keyframe&#x2B;empty_moov&#x27;,&#xA;                ])&#xA;                .noAudio()&#xA;                .output(`/tmp/output_${imgId}.mp4`)&#xA;                .on(&#x27;end&#x27;, () => {&#xA;                    console.log(&#x27;MP4 video generated&#x27;)&#xA;                    resolve()&#xA;                })&#xA;                .on(&#x27;error&#x27;, (e) => {&#xA;                    console.log(e)&#xA;                    reject()&#xA;                })&#xA;                .run()&#xA;        })&#xA;</void>

    &#xA;

    Using ffmpeg-static :

    &#xA;

    const pathToFfmpeg = require(&#x27;ffmpeg-static&#x27;)&#xA;const ffmpeg = require(&#x27;fluent-ffmpeg&#x27;)().setFfmpegPath(pathToFfmpeg)&#xA;

    &#xA;

  • QuickTime plays separate audio tracks all at once with ffmpeg generated file

    23 mai 2022, par Justin Smith

    Let's say I have four files :

    &#xA;

      &#xA;
    • video.mp4

      • &#xA;

    • english.mp4

      • &#xA;

    • french.mp4

      • &#xA;

    • spanish.mp4

      • &#xA;

    &#xA;

    I'm using the following ffmpeg command to create a single video file with multiple audio tracks for each language :

    &#xA;

    ffmpeg -i video.mp4 -i english.mp4 -i spanish.mp4 -i french.mp4 \&#xA;-map 0:v -map 1:a -map 2:a -map 3:a \&#xA;-metadata:s:a:0 language=eng -metadata:s:a:0 title="English" \&#xA;-metadata:s:a:1 language=spa -metadata:s:a:1 title="Spanish" \&#xA;-metadata:s:a:2 language=fra -metadata:s:a:2 title="French" \&#xA;-disposition:a:0 default \&#xA;-c:v copy -c:a aac output.mp4&#xA;

    &#xA;

    The resulting video file output.mp4 works fine in VLC, but the audio tracks play all at once in QuickTime and the separate audio channels don't appear in the Languages menu. What am I doing wrong here ?

    &#xA;

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