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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 render a group of videos into a larger video with FFmpeg

  17 octobre 2020, par thewayman

  How do I render a group of videos in a grid where video size and placement is variable.
I know how to merge two videos with FFmpeg, but how to do it for a grid.

  


  ffmpeg.exe -i "2.avi" -vf "[in] scale=640:480 , pad=width=640+640:height=480:x=0:y=0:color=red [left];movie=1.avi, scale=0:480 , pad=width=640:height=480:x=(640-480)/2:y=0:color=red [right]; [left][right] overlay=640:0 [out]" -b:v 768k "Output1.mp4"


  


  

  


• How do I live stream a queue of videos from ffmpeg to my site then embed it to a page ?

  3 septembre 2018, par James

  I have a queue of videos I want to stream using ffmpeg to my site and then embed it onto the homepage. I think I have the embed part down,(video tag then source it to the url ffmpeg is streaming to ?) but I have no idea how I create a queue of videos for ffmpeg and then stream it to my site. Should I make a bash script that when ffmpeg is done streaming one video it moves onto the next or is there a built in function to ffmpeg that has a queue ?