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Thread: ffmpeg stopped working with .m4a

  1. #1
    Join Date
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    ffmpeg stopped working with .m4a

    This code (to extract a section) has worked well for a long time

    ffmpeg -vcodec copy -ss 71 -t 624 /home/bill/Music/recordings/source.m4a /home/bill/Segment-01.m4a

    But has now stopped working.

    First I get "...source.m4a already exists - OK to delete"
    Then with:-

    ffmpeg -i aa.m4a -ss 00:00:00 -t 00:05:00 -acodec copy new.m4a

    I get:-

    ffmpeg version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
    built on Jun 12 2012 16:37:58 with gcc 4.6.3
    *** THIS PROGRAM IS DEPRECATED ***
    This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
    aa.m4a: Invalid data found when processing input

    Any help would be appreciated.

    Ubuntu 12.04
    KDE SC Version 4.9.2

  2. #2
    Join Date
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    3,475

    Re: ffmpeg stopped working with .m4a

    Quote Originally Posted by bill-lancaster View Post
    This code (to extract a section) has worked well for a long time

    Code:
    ffmpeg -vcodec copy -ss 71 -t 624 /home/bill/Music/recordings/source.m4a /home/bill/Segment-01.m4a
    You're applying your options to your input when you should be using them as output options, so move them past the input. The general syntax is:

    Code:
    ffmpeg [input options] -i input [output options] output
    Which version of Ubuntu did it previously used to work in?

    Quote Originally Posted by bill-lancaster View Post
    Code:
    ffmpeg version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
    This means that you're not actually using the real ffmpeg. Unfortunately, as of 11.04, Ubuntu has switched from FFmpeg to a fork which I've found (via many other users) is quite buggy. See Who can tell me the difference and relation between ffmpeg, libav, and avconv for more inro.

  3. #3
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    Ubuntu 12.04 Precise Pangolin

    Re: ffmpeg stopped working with .m4a

    I've just tried your second command on an M4A file (using avconv/ffmpeg on 12.04), and I can't replicate your problem. Are you sure there isn't just a problem with those particular files?

  4. #4
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    Re: ffmpeg stopped working with .m4a

    Quote Originally Posted by bill-lancaster View Post
    Code:
    ffmpeg -vcodec copy -ss 71 -t 624 /home/bill/Music/recordings/source.m4a /home/bill/Segment-01.m4a
    First I get "...source.m4a already exists - OK to delete"
    Yes, evilsoup is correct. Now I see the problem. You did not include the "-i", and therefore it assumes that source.m4a is the output. Since it already exists it asks if you want to overwrite or delete it (what it assumes as the input exactly I'm not sure) resulting in a file with no content (0 bytes).

  5. #5
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    Re: ffmpeg stopped working with .m4a [SOLVED]

    Thank you for your sugestions - sorry, have been away for a while.

    1) The file is fine, plays with mplayer etc.
    2) Have tried puting "-i" at various points but without success.

    ffmpeg version 0.8.4-4:0.8.4-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers.

    But now, (as per original post)

    ffmpeg -i source.m4a -ss 00:00:00 -t 00:05:00 -acodec copy new.m4a

    produces a perfectly good segement.

    I'll mark this as SOLVED but don't really understand!

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