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Sur d’autres sites (13326)

  • ffmpeg alpha channel of images lost

    4 mai 2021, par gilad s

    Using the following command I make images appear partially transparent. This seems to work as expected.

    


     convert original.jpg -alpha set -background none -channel A -evaluate multiply 0.2 +channel image_01.png
 convert original.jpg -alpha set -background none -channel A -evaluate multiply 0.2 +channel image_02.png


    


    After the images are created I use ffmpeg to turn them into a video :

    


     ffmpeg -i image_%02d.png -pix_fmt yuv420p -c:v libx264 result.mp4


    


    The resulting video doesn't include the partial transparency. The images appear just like the original. It seems the alpha channel of the images is lost.

    


  • How to disable non-1st Audio Streams/Tracks in FFmpeg for mp4 files

    21 avril 2018, par Dipesh

    My end goal is to create a single FFmpeg command that will convert my h264.DTS.mkv files to a format that is compatible with my AppleTV, whilst preserving the original quality.

    I’m almost there, however I have not been able to figure out how to disable streams/tracks.

    So far I have got :

    ffmpeg -i FILE \
    
 -y -strict experimental \
    
 -map 0:0 -map 0:1 -map 0:1 -map 0:1 -map 0:2 \
    
 -c:0 copy -c:1 aac -ac:a 2 -c:2 ac3 -ac:a 6 -c:3 copy -c:4 mov_text \
    
 OUTPUT

    This produces an output file that looks like :

    1. H264 video track (enabled) [copied from original]
    2. AAC 2 channel audio track (enabled)
    3. AC3 6 channel audio track (enabled)
    4. DTS 6 channel audio track (enabled) [copied from original]
    5. subtitle track (enabled)

    The problem is I need it to look like :

    1. 1 H264 video track (copied from original) (enabled)
    2. 1 AAC 2 channel audio track (enabled)
    3. 1 AC3 6 channel audio track (disabled)
    4. 1 DTS 6 channel audio track (copied from original) (disabled)
    5. 1 subtitle track (enabled)

    Hence I need to know how I can disable the non-1st Audio Streams/Tracks.

    From what I have read, this is part of the track header atom at the location "tkhd.flags". But I have not been able to figure out how to set this via command line arguments.

    Any help would be greatly appreciated.

  • How to disable non-1st Audio Streams/Tracks in FFmpeg for mp4 files

    16 décembre 2016, par Dipesh

    My end goal is to create a single FFmpeg command that will convert my h264.DTS.mkv files to a format that is compatible with my AppleTV, whilst preserving the original quality.

    I’m almost there, however I have not been able to figure out how to disable streams/tracks.

    So far I have got :

    ffmpeg -i FILE \
    
 -y -strict experimental \
    
 -map 0:0 -map 0:1 -map 0:1 -map 0:1 -map 0:2 \
    
 -c:0 copy -c:1 aac -ac:a 2 -c:2 ac3 -ac:a 6 -c:3 copy -c:4 mov_text \
    
 OUTPUT

    This produces an output file that looks like :

    1. H264 video track (enabled) [copied from original]
    2. AAC 2 channel audio track (enabled)
    3. AC3 6 channel audio track (enabled)
    4. DTS 6 channel audio track (enabled) [copied from original]
    5. subtitle track (enabled)

    The problem is I need it to look like :

    1. 1 H264 video track (copied from original) (enabled)
    2. 1 AAC 2 channel audio track (enabled)
    3. 1 AC3 6 channel audio track (disabled)
    4. 1 DTS 6 channel audio track (copied from original) (disabled)
    5. 1 subtitle track (enabled)

    Hence I need to know how I can disable the non-1st Audio Streams/Tracks.

    From what I have read, this is part of the track header atom at the location "tkhd.flags". But I have not been able to figure out how to set this via command line arguments.

    Any help would be greatly appreciated.

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