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• How to determine the best way to split video and merge it back ?

  6 novembre 2018, par Rami Alzebak

  Let’s say that I want to convert a Video to different resolution.

  The workflow is as follows :
  1- Splitting the video into n blocks
  2- Convert the resolution of the block
  3- Merge the blocks

  The reason why I am doing is to achieve the conversion process on parallel workers (not necessarily threads )

  The issue is I can’t determine what is the best number of blocks to split the video.

  E.g : When splitting a large video into 10 blocks it will reduce the total time .
  but when splitting a small one it may increase the total time .

  any hints or keys on the topic ?

• FFmpeg split videos into smaller chunks of 15 second each with a stride of 10 seconds

  15 octobre 2022, par a mau5

  I want to split a 1 hour video into chunks of 15 seconds each. But after every 15 seconds I want to skip 10 seconds. For eg :- I want a clip from first 0-15 seconds save it, then skip 10 seconds, the second clip should be from 25-40 th second from the original video. Does someone know how to implement this using FFmpeg ?

  


  ffmpeg -I Vid.mp4 -f segment -segment_atclocktime 1 -segment_clocktime_offset 00:00:10 -segment_time 00:00:15 -reset_timestamps 1 output_%03d.asf

  


  This command is not working as expected. I don't want to implement this in a for loop, but in a single pass

  


• Is there an elegant way to split a file by chapter using ffmpeg ?

  6 février 2017, par Kattern

  In this page, Albert Armea share a code to split videos by chapter using ffmpeg. The code is straight forward, but not quite good-looking.

  ffmpeg -i "$SOURCE.$EXT" 2>&1 | grep Chapter | sed -E "s/ *Chapter #([0-9]+.[0-9]+) : start ([0-9]+.[0-9]+), end ([0-9]+.[0-9]+)/-i \"$SOURCE.$EXT\" -vcodec copy -acodec copy -ss \2 -to \3 \"$SOURCE-\1.$EXT\"/" | xargs -n 11 ffmpeg

  Is there an elegant way to do this job ?