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    MediaSPIP automatically converts uploaded files to internet-compatible formats.
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  • Combine video using ffmpeg took long time

    19 septembre 2019, par Shijin

    I have two video files,I am trying to mix the video to create a single video with one video on the left and another at the right. For this, I was used FFMPEG with the following command.

    ffmpeg -y -threads 4 -loglevel debug -ss 4.22 -t 6127.514 -i left.webm -ss 0 -t 6131.734 -i right.webm -filter_complex "[0]scale=320:-1,pad=2*iw:2*ih:0:120[left];[1]scale=320:-1[right];[left][right]overlay=main_w/2:120,scale=640:480;[0][1]amix" -shortest composed.mp4

    It is working, But it took a long time and i need to wait for hours to complete the task with large files.
    Anyone can suggest a method to improve performance or an alternative solution ?
    I have already upgraded my server with maximum resources, But not improved.

  • interrupt and resume long running ffmpeg encoding

    17 octobre 2022, par simon

    When i have a longer high res video (full-hd or 4k) which are not compressed well, encoding to webm/vp9 can take very long even with a recent system due to the lack of hardware acceleration with webm/vp9.
Are there any options to interrupt an encoding with ffmpeg and resume which survives a reboot.
So i don't want to pause encoding using bg but save & stop encoding state and resume from there.

    


    The next best thing i could think of is to split the source into smaller subsets (by time) and process them and stitch results together again. But this only allows predefined interruption points and requires the split & merge to be done in addition.
On the pro side it could allow parallel processing if multithreading is not using all available cores yet.

    


  • avfilter/vf_fieldmatch : forward status back from output to all input links

    25 septembre 2019, par Paul B Mahol
    avfilter/vf_fieldmatch : forward status back from output to all input links

    Fixes #8199.
    • [DH] libavfilter/vf_fieldmatch.c

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