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  • ffmpeg : how to prevent wait in case of error

    14 février, par xrfang

    I use ffmpeg to add watermark to images/videos, using the following command line :

    


    ffmpeg -y -f mjpeg -i input -i /tmp/watermark.png -filter_complex "..." -f mjpeg output


    


    The problem is, in case the input file is not a jpeg file, the process will HANG instead of quit with an error :

    


    Press [q] to stop, [?] for help
[mjpeg @ 0x126dc60] dqt: len 28602 is too large
Error while decoding stream #0:0: Invalid data found when processing input
frame=    0 fps=0.0 q=0.0 size=       0kB time=-577014:32:22.77 bitrate=  -0.0kbits/s speed=N/A


    


    In my situation, the file has no extension, and I have to specify -f. In case I got the file type wrong, it is an acceptable bug, which I can fix as soon as I found such problem. However it is not good for me if ffmpeg hangs without returning to the parent process, because I have a very large queue of files to process, and I don't want any bug to block the processing task.

    


  • A way to convert bitrate/format of audio files (between upload & storage to S3)

    5 octobre 2011, par Jonathan Coe

    Currently using PHP 5.3.x & Fedora

    Ok. I'll try to keep this simple. I'm working on a tool that allows the upload & storing of audio files on S3 for playback. Essentially, the user uploads a file (currently only allowing mp3 & m4a) to the server, and the file is then pushed to S3 for storage via the PHP SDK for amazon aws.

    The missing link is that I would like to perform a simple bitrate & format conversion of the file prior to uploading the file. (ensuring that all files are 160kbs and .mp3).

    I've looked into ffmpeg, although it seems that the PHP library only allows for reading bitrates and other meta, not for actual conversion.

    Does anyone have any thoughts on the best way to approach this ? Would running a shell_exec() command that performs the conversion be sufficient to do this, or is there a more efficient/better way of doing this ?

    Thanks in advance ! Any help or advice is much appreciated.

  • Upload audio file, convert bitrate, save to S3 | server side options ?

    29 septembre 2011, par Jonathan Coe

    Currently using PHP 5.3.x & Fedora

    Ok. I'll try to keep this simple. I'm working on a tool that allows the upload & storing of audio files on S3 for playback. Essentially, the user uploads a file (currently only allowing mp3 & m4a) to the server, and the file is then pushed to S3 for storage via the PHP SDK for amazon aws.

    The missing link is that I would like to perform a simple bitrate & format conversion of the file prior to uploading the file. (ensuring that all files are 160kbs and .mp3).

    I've looked into ffmpeg, although it seems that the PHP library only allows for reading bitrates and other meta, not for actual conversion.

    Does anyone have any thoughts on the best way to approach this ? Would running a shell_exec() command that performs the conversion be sufficient to do this, or is there a more efficient/better way of doing this ?

    Thanks in advance ! Any help or advice is much appreciated.

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