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• How to split accurately a LONG GOP video (h264/XDCAM...) with FFMPEG ?

  29 août 2013, par Manuhoz

  My goal is to split a XDCAM or a H264 video, frame-accurately, with ffmpeg.
  I guess that the problem comes from its long GOP structure, but I'm looking for a way to split the video without re-encoding it.
  I apply an offset to encode only a specific section of the video (let say from the 10th second to the end of the media)
  Any ideas ?

• split videos with ffmpeg

  23 novembre 2020, par 5Diraptor

  I'm trying to create a script that scans a directory, and for all videos larger then X size, splits them down into smaller chunks.

  


  There are two similar questions :

  


  

  • Using ffmpeg to split video files by size

  


  • Split into equal parts and convert many mp4 videos using ffmpeg

  


  


  Neither of these work in the way I want. The first you have to manually input every file that you want to process. The second doesn't check for filesize, or output the files in the way I want.

  


  So far, this is the contents of the .bat file :

  


  %~d1&#xA;&#xA;for %%a in (*.MOV) do (&#xA;&#xA;if %%~za GTR 2000000000 (&#xA;&#xA;REM usage %%a <filename>&#xA;set "_filename=%~n1"&#xA;set "_tally=.SPLIT-%03d"&#xA;set "_extension=%~x1"&#xA;&#xA;set "_outputname=%_filename%%_tally%%_extension%"&#xA;&#xA;&#xA;    ffmpeg -i "%%a" ^&#xA;        -crf 0 -c copy -map 0 -segment_time 00:00:30 -f segment -reset_timestamps 1 ^&#xA;        %_outputname%&#xA;)&#xA;)&#xA;pause&#xA;</filename>

  


  My aim is for the script to work in the following way :

  


  

  1. Drag a video (from a folder of videos) onto the .bat file.

  


  2. Script opens up, and targets each file ending .MOV, and is greater then 2GB

  


  3. ffmpeg splits the video down into >2GB chunks. (I know it's currently split down in 30 second chunks, still working on understanding how to use the -fs parameter).

  


  4. Each chunk gets saved with the original filename and extension, but the filename is suffixed with ".SPLIT" and then a unique number that relates to which file it is - first file is 000 and second is 001 etc.

  


  


  Problems :

  


  

  • Firstly, I want to split by filesize and not time, but I don't understand how to use the -fs parameter in this case. I guess I could use something like ffprobe -i input.file -show_format -v quiet | sed -n 's/duration=//p' in conjunction with it but I'm not confident...

  


  • Secondly, I'm getting a problem with %03d in the .bat. Think I'm mixing up languages ? It retrieves the filepath of the .bat file instead of counting number of loops.

  


  


  Any help really appreciated !

  


• How to split an incoming stream into multiple streams with different resolutions ?

  30 janvier, par Cobalt

  How to split an incoming stream into several streams with different resolutions on the MediaMTX server ? There is one incoming stream in rtsp, it needs to be split into several channels with different resolutions. I think in the direction of ffmpeg, but I don't understand how to register this in the mediamtx settings.