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• How to let ffmpeg download partial m3u8 video without download the full ones ?

  15 octobre 2018, par 3142 maple

  I want to get a video from a m3u8 stream from range : 21:24 22:54.
  I found a answer at https://superuser.com/questions/758943/ffmpeg-cut-for-time-range , and it said I can use -ss 00:21:24.00 -t 90 to cut it.

  But I found that ffmpeg is actually download the whole video until 00:21:24.00 rather that just download 21:24 22:54 .
  How can I let it just download the 90 seconds I want ?

  The command I came up :

  ffmpeg -i "M3U8URL" -acodec copy -vcodec copy -ss 00:21:24.00 -t 90 output.mp4

• ffmpeg how to concacenate 2 videos in alternating order every X seconds (blinking effect) [closed]

  27 octobre 2020, par aj6

  I'd like to use ffmpeg to stitch together a video in the following manner : I'd like to take X number of frames or seconds from 2 (or more) videos, one by one, and output a new file composed of all frames of original videos, but in a new order (not concatenated one after the other, but rather by X frames or seconds).

  


  To clarify - let's say there are 2 videos, each 1 minute long. I'd like to concatenate these 2 videos second by second (for example), using 1 second from the first video, then 1 second from the next video, with the resulting output, the 3rd file, being 2 minutes long and containing all the information from the original vids, but played back in a "blinking" manner - a second or X number of frames from each vid.

  


  Just to be sure it's clear : Let's say I have 2 videos, 10 seconds each, I'd like them to be joined in the following manner : (1 second from vid#1), (1 second from vid#2), (1 second from vid#1), (1 second from vid#2) etc. until both files' end. (Assume the duration of both vids is same).

  


  I understand how to do it if I need to simply concatenate files one after another, or even switch from one to the next a few times with an overlay, but I was unable to find ANYTHING about joining videos frame by frame or X number of seconds for the entire duration of the vid, only solutions for switching video overlay a couple of times, putting in time stamps by hand.

  


  Any help is much appreciated. Thank you.

  


• Merge videos with different start times and show them on a grid

  1er août 2017, par shamaleyte

  I have multiple video files of a conference call. However, each participant joined the call at a different time, which resulted in the fact that each video file has a different start time offset values.

  Video   Start Time
  
  ------------------
  
  Video1  00:00
  
  Video2  00:10
  
  Video3  01:40

  My purpose is to play back this conference. However, I did not record the conference as 1 video, it is recorded with multiple video files, instead.
  How do I stitch these videos ?

  There is also a paid solution to merge video fragments to a single clip – this will make the client-side much simpler. But can I do it for free ?

  The expected outcome is to have one video showing three videos on a grid.
  When ffmpeg stitches the videos, it should consider their start time values properly so that the videos are played accordingly.