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  • Re-encode a video keeping the GOP structure of the original video [closed]

    5 avril, par Baltar27

    Is there a way to re-encode a video with ffmpeg keeping the GOP structure of the original file ? That is, if a frame is IDR, I, B or P in the input file, keep the same type in the output file, even if the GOP is variable and/or adaptive (it changes dynamically GOP type Open/Closed, the I period N or the P period M). Encoding in this way allows to maintain the maximum quality as the Open/Closed, I/B/P and GOP length decisions has been taken already by the original encoder.

    


  • FFMPEG merging audio and video to get resulting video

    26 septembre 2016, par King

    I need to merge audio and video using ffmpeg so that, it should result in a video with the same duration as of audio.

    I have tried 2 commands for that requirement in my linux terminal. Both the commands work for a few of the input videos ; but for some other input_videos, they produce output same as the input video, the audio doesn’t get merged.

    The commands, I have tried are -

    ffmpeg -i wonders.mp4 -i Carefull.mp3 -c copy testvid.mp4

    and

    ffmpeg -i wonders.mp4 -i Carefull.mp3 -strict -2 testvid.mp4

    and

    ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac -strict
    experimental output.mp4

    and these are my input videos -

    1. samplevid.mp4

    https://vid.me/z44E

    duration - 28 seconds

    size - 1.1 MB

    status - working

    And

    1. wonders.mp4

    https://vid.me/gyyB

    duration - 97 seconds

    size - 96 MB

    status - not working

    I have observed that the large size (more than 2MB) of the input video is probably the issue.

    But, still I want the fix.

  • how to check the number of duplicated frame for video 1sec ( about 30frames ) from video start and want to apply this for mpdecimate

    20 octobre 2018, par cool jobs

    How to check the number of duplicated frame for video 1sec ( about 30frames ) from video beginning point ? I want to apply this for mpdecimate with audio. Some videos have three duplicated frames, some videos - 15 duplicated frame, some videos have 19 duplicated frames.. so it looks I need a variable or math operator in ffmpeg as expression.

    1. some video have duplicated frames at beginning point , but it is
      not same always the number of duplicated frames.
    2. if get back variable which is for the number of duplicated frames
      from step-1 then split and trim apply mpdecimate with audio as
      much as step-1 variable returned, finally do concatenate each other.

    Is this possible with -filter_complex for one line ffmpeg command ?

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