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Sur d’autres sites (9581)

  • Android FFmpeg ComplexCommand to remove frames from the back of a video

    17 août 2017, par Tix

    Compiled using

    compile ’com.writingminds:FFmpegAndroid:0.3.2’

    Currently i have only managed to come up with a complexcommand that removes duplicate frames, and only start to capture frames from frame 25 onwards of a video like so :

    String[] complexCommand = {"-y", "-i", yourRealPath, "-an", "-framerate", "60", "-vf", "select='gte(n,25)'", "-vsync", "0",  dest.getAbsolutePath()};

    select='gte(n,25)' will return me all frames from frame 25 onwards.

    "-vsync", "0" will remove duplicate frames.

    Now i want to ALSO remove certain number of frames from the back of the video, for e.g. i want to remove the last 20 frames. How do I go about doing that ?

  • How to implement multiple video resolutions on front and back-end

    25 février 2021, par LanGuu

    I need a solution or hint on how should I handle multiple resolutions on front-end and back-end. I have been reading about hls, dash, and mse for last few days but the more information I read, the more lost I am.

    


    Right now I have only a microservice for downscaling video using FFmpeg. The FFmpeg returns mp4 with no hls or dash, 4 video resolutions with no sound, and 2 different audio quality.
On front-end, I use react-player. The hardest part is that I need to merge audio and video, synchronize and handle change quality events.
I have found Media source extensions but it won't work I am not sure, but probably because I am using raw mp4 files.

    


    I would like to ask you a few questions

    


      

    1. It is possible to combine video and audio sources without MSE and still keep video and audio separate

      2. 


    2. Do I need HLS or Dash to use MSE ?

      3. 


    3. What is a difference between progressive download and progressive streaming ?

      4. 


    4. If I have to choose what is better right now hls or dash ? what is much easier to implement ?

      5. 


    


  • avformat/wtvdec : Check for EOF before seeking back in parse_media_type()

    1er août 2021, par Michael Niedermayer
    avformat/wtvdec : Check for EOF before seeking back in parse_media_type()

    Fixes : Infinite loop
    
Fixes : 36311/clusterfuzz-testcase-minimized-ffmpeg_dem_WTV_fuzzer-4889181296918528
    

    Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    
Reviewed-by : Peter Ross <pross@xvid.org>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavformat/wtvdec.c

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