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Sur d’autres sites (6155)

  • Is it possible to set channel layout of wave file using ffmpeg without re-encoding the file ?

    27 août 2020, par John Baker

    I want to set the WAVEFORMATEXTENSIBLE dwChannelMask (channel order mask) in a poly WAV file that doesn't yet have a channel mask set.

    


    Can ffmpeg do this ? If not, is there another tool that can do this ?

    


  • Copying audio stream from a source file to a trancoded video file using ffmpeg

    17 août 2012, par Gary

    I have built my own video-only transcoder using ffmpeg without audio. I do not want to transcode the audio. What will be best way to add the audio stream from the source file to the transcoded file using FFMPEG API ?

  • ffmpeg output file smaller than input file

    3 mai 2020, par Debug255

    I am using ffmpeg to rotate videos 90 or 180 degrees in a Python script. It works great. But, I am curious as to why the output file would be a smaller amount of bytes than the input file.

    



    Here are the commands I use :

    



    180 degrees :

    



    ffmpeg -i ./input.mp4 -preset veryslow -vf "transpose=2,transpose=2,format=yuv420p" -metadata:s:v rotate=0 -codec:v libx264 -codec:a copy ./output.mp4

    



    90 degrees :

    



    ffmpeg -i ./input.mp4 -vf "transpose=2" ./output.mp4

    



    For example, a GoPro Hero 3 MP4 file was originally 2.0 GB. The resulting output file was 480.9 MB. Another GoPro file was 2.0 and its resulting file was 671.5 MB. Is this maybe because the GoPro files were 2.0 but contains empty space, sort of like how some NTFS filesystems make a minimal 4k file, even when there is less bytes in it ?

    



    If this isn't the GoPro Hero 3, how do I rotate the files 90 or 180 degrees but ensure the output file size is the same ? Or, is data loss expected ? Does the data loss have to do with the format ?

    



    Note that the quality of the video doesn't appear to be damaged, which is good. So, I am interested in learning more about why this is happening, then I can read the section of ffmpeg documentation that is relevant to this.

    



    Thank you !

    


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