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• ffmpeg split videos from times in csv file

  10 juin 2018, par martins

  I’m using Python 3.6. I am trying to split videos into subclips of specified time. I have a folder with 250 ".mp4" files and a separate csv with the times at which I want each video to be subclipped. For instance, a first .mp4 file would be "firstvideo.mp4" up to "twohundredfiftyvideo.mp4". Separately, I have a csv file with each video file name in column A and the timing at which each video needs to be split (column B to I). All videos need to be split into 4 subclips. The .csv looks like :

          col A          col B      col C       colD      colE    .. colI
  
  row1 firstvideo.mp4  00:00:10 - 00:00:20 - 00:01:15 - 00:02:04 .. 00:07:15
  
  row2 secondvideo.mp4 00:00:15 - 00:00:34 - 00:01:05 - 00:01:55 .. 00:08:23

  "firstvideo.mp4" needs a first split from second 10 to 20, a second split from 1m15s - 2m04s and so on (colI is the time at which the fourth subclip should stop). The process should iterate for each of the 250 rows of the csv file corresponding to the 250 mp4 files in a folder.

  So far, the only thing I know is to use ffmpeg to split videos into 4 subclips and generate 4 different output files but do not know how to read from the csv line by line... This is the code I have so far.

  ffmpeg -i firstvideo.mp4 -vcodec copy -acodec copy -ss 00:00:10 -t 00:00:20
  
  firstvideo_1.mp4 -vcodec copy -acodec copy -ss 00:01:15 -t 00:02:04 firstvideo_2.mp4 -vcodec copy -acodec copy -ss 00:03:48 -t 00:04:23 
  
  firstvideo_3.mp4 -vcodec copy -acodec copy -ss 00:05:30 -t 00:07:15 firstvideo_4.mp4

  I name each output file with a _1,_2,_3 or _4 appended to the original video file name. Ideally, I would generate 4 subclips per video (i.e. 250 videos x 4subclip/video = 1,000 mp4 files) and then concatenate each video 4 subclips into one file (i.e. 250 additional files). In fact, I don’t care about the 4 subclips, I’d delete them after they generated my concatenated file.

  Thanks for your time anyways,

• How to split video files upon detected change in speakers ? (ie. different file for different speaker)

  21 août 2019, par afnan khan

  have an audio file that have 2 speakers . Audio file has conversation between them. I want to split that file in 2 parts. One part should have conversation of Person A and other should have conversation of Person B.

  I have tried to split on silent but it does not work. Any suggestion to do this ?

• How to get ffmpeg split results in a streaming-like way ?

  15 décembre 2016, par Alex

  My goal is to transfer video files to another peer using webRTC and play it in real time on web page. In case of lag, I decided to split video files before tranferring. I’m using ffmpeg (actually a javascript version here) to split videos using commands like

   ffmpeg -i input.mp4 -codec copy -map 0 -f segment out%0d.mp4

  , which will get a series of output files at the same time. But I want to transfer the output files one by one and start to play them in right order before getting all output files, can i do that ?