[Libav-user] MP4 concatenation with MP42 major_brand

[Nicolas George]

Le decadi 30 frimaire, an CCXXV, black copper a écrit :
> I have MP4 source videos, that contain:
> 
> video: H264
> audio: G.711 (mulaw)
> 
> I want to use concatenation on source videos to get one MP4 file.
> 
> I used concat filter by first creating a list: mylist.txt file as follows:
> 
> file 'v1.mp4'
> file 'v2.mp4'
> file 'v3.mp4'
> 
> then envoked ffmpeg command like this:
> 
> ffmpeg -f concat -i mylist.txt -c copy op.mp4 -y
> 
> This worked only with files that are mp41 compatible.
> 
> With mp42 files that I mentioned above, I get this error:
> 
> [mp4 @ 0x24ca780] Could not find tag for codec pcm_mulaw in stream #1,
> codec not currently supported in container
> Could not write header for output file #0 (incorrect codec parameters ?):
> Invalid argument

This message is about output, not input. Please test remuxing a single
file, without concat, using the first file in each sequence:

ffmpeg -i input.mp4 -c copy output.mp4

If, as I suspect, it fails the same way, your problem is exactly what is
written in the second line of the error message.

Also, note that you posted on the wrong mailing-list. Adding ffmpeg-user
as recipient, please reply only there.

Regards,

-- 
  Nicolas George

> Full command line:
> 
> --------------------
> ffmpeg -f concat -i mylist.txt -c copy op.mp4 -y
> ffmpeg version N-82760-g55affd9 Copyright (c) 2000-2016 the FFmpeg
> developers
>   built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
>   configuration: --pkg-config-flags=--static
> --extra-cflags=-I/home/ubuntu/ffmpeg_build/include
> --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --enable-gpl
> --enable-libass --enable-libfdk-aac --enable-libfreetype
> --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
> --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
>   libavutil      55. 41.101 / 55. 41.101
>   libavcodec     57. 66.109 / 57. 66.109
>   libavformat    57. 58.101 / 57. 58.101
>   libavdevice    57.  2.100 / 57.  2.100
>   libavfilter     6. 68.100 /  6. 68.100
>   libswscale      4.  3.101 /  4.  3.101
>   libswresample   2.  4.100 /  2.  4.100
>   libpostproc    54.  2.100 / 54.  2.100
> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x23ed7c0] Auto-inserting h264_mp4toannexb
> bitstream filter
> Guessed Channel Layout for Input Stream #0.0 : mono
> Input #0, concat, from 'mylist.txt':
>   Duration: N/A, start: 0.000000, bitrate: 518 kb/s
>     Stream #0:0(eng): Audio: pcm_mulaw (ulaw / 0x77616C75), 8000 Hz, mono,
> s16, 64 kb/s
>     Metadata:
>       creation_time   : 2016-12-20T03:41:14.000000Z
>       handler_name    : ?Apple Sound Media Handler
>     Stream #0:1(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
> 1920x1080, 454 kb/s, 27.70 fps, 27.70 tbr, 90k tbn, 180k tbc
>     Metadata:
>       creation_time   : 2016-12-20T03:41:14.000000Z
>       handler_name    : ?Apple Video Media Handler
>       encoder         : H.264
> [mp4 @ 0x2413780] Could not find tag for codec pcm_mulaw in stream #1,
> codec not currently supported in container
> Could not write header for output file #0 (incorrect codec parameters ?):
> Invalid argument
> Stream mapping:
>   Stream #0:1 -> #0:0 (copy)
>   Stream #0:0 -> #0:1 (copy)
>     Last message repeated 1 times
> ----------------
> 
> I'm on Ubuntu 14.04 OS.
> 
> Is there anyway I can get this functionality to work with mp42 compatible
> files? any help is much appreciated,
> 
> Thanks,

> _______________________________________________
> Libav-user mailing list
> Libav-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/libav-user

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