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Sur d’autres sites (12964)

  • Maintaining timecode using -ss trim tool

    1er février 2016, par Alex Noble

    I’m currently using this FFMPEG script (using "run shell script" in Automator) on QT ProRes files to strip off the first six channels of audio, pass through for audio and video, and trim the first 6.5 seconds off the beginning of the video :

    for f in "$@"
    
do
    
/usr/local/bin/ffmpeg -ss 6.5 -i "$f" -c:v copy -map 0:0 -c:a copy -map 0:7  "${f%.*}_ST.mov"
    
done

    When I use this script, it successfully trims the file but then moves the original timecode up to the new beginning of the clip. So if 00:59:48:00 was my timecode at the beginning of the original clip, it’s now also the starting timecode of the beginning of my trimmed clip.

    My question is how can I trim 6.5 seconds off the beginning while also trimming that same amount of time off my timecode as well ?

    So instead of my trimmed clip (let’s say 23.98 fps) starting at 00:59:48:00, it would start at 00:59:54:12 since 6.5 seconds (roughly 156 frames) have been trimmed.

  • ffmpeg split avi into frames with known frame rate

    5 septembre 2023, par Myx

    I posted this as comments under this related thread. However, they seem to have gone unnoticed =(

    



    I've used

    



    ffmpeg -i myfile.avi -f image2 image-%05d.bmp


    



    to split myfile.avi into frames stored as .bmp files. It seemed to work except not quite. When recording my video, I recorded at a rate of 1000fps and the video turned out to be 2min29sec long. If my math is correct, that should amount to a total of 149,000 frames for the entire video. However, when I ran

    



    ffmpeg -i myfile.avi -f image2 image-%05d.bmp


    



    I only obtained 4472 files. How can I get the original 149k frames ?

    



    I also tried to convert the frame rate of my original AVI to 1000fps by doing

    



    ffmpeg -i myfile.avi -r 1000 otherfile.avi


    



    but this didn't seem to fix my concern.

    


  • ffmpeg split avi into frames with known frame rate

    31 mai 2016, par Myx

    I posted this as comments under this related thread. However, they seem to have gone unnoticed =(

    I’ve used

    ffmpeg -i myfile.avi -f image2 image-%05d.bmp

    to split myfile.avi into frames stored as .bmp files. It seemed to work except not quite. When recording my video, I recorded at a rate of 1000fps and the video turned out to be 2min29sec long. If my math is correct, that should amount to a total of 149,000 frames for the entire video. However, when I ran

    ffmpeg -i myfile.avi -f image2 image-%05d.bmp

    I only obtained 4472 files. How can I get the original 149k frames ?

    I also tried to convert the frame rate of my original AVI to 1000fps by doing

    ffmpeg -i myfile.avi -r 1000 otherfile.avi

    but this didn’t seem to fix my concern.

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