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  • Dose all H.264 video stream can be decompressed using Video Toolbox in iOS 8 ?

    10 octobre 2016, par fernandowei

    I met some h.264 video files which show large area of green on the screen without any error when decoding using Video Toolbox while I can decode most other h.264 video files successfully.

  • How to use ffmpeg to extracted every nth frame from a video to generate a shorter new video ? [duplicate]

    12 octobre 2022, par J.W

    For example, a video length is 60 seconds with 25 FPS, there are 25 * 60 = 1500 frames.
How to extract the 1st frame every 5 frames, i.e., for the first second's 25 frames, need to extract the 5 frames at 1st, 6th, 11th, 16th and 21st, so the result new video would have 300 frames in total, and at the same time keep the same FPS (or increase FPS) to make the new video shorter, for example :

    


      

    1. to keep the result video to be 25 FPS (same as original video), the video length is 12 seconds ; or

      2. 


    2. to make the result video to be 30 FPS, the video length is 10 seconds

      3. 


    


    Note : the answer in the comment of this similar question solved my question :

    


    ffmpeg -an -i in.mp4 -vf framestep=5,setpts=N/25/TB -r 25 out.mp4


    


  • How to convert a video to match an existing video (codec, fps, bitrate, height, width, etc.) ? [duplicate]

    30 octobre 2020, par Mahdi Saheb

    I have a video file and can see the info using ffmpeg -i video.mp4. The question is how to use this data to encode another video file to match with this ?

    


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