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• To extract and get some parts/clips out of a MP4 file to be concatenated into another

  22 juillet 2021, par klentit nonok

  How to extract/get some parts/clips out of a MP4 file to be concatenated into another new MP4 file

  


  tried to get/extract out only first 19 seconds, also a part beginning from 32th up to its next 37 seconds, and finally part beginning from 2 min 29th s up to its next 99 seconds, by this :

  


  $ ffmpeg -t 19 -i Example.mp4 -ss 0:0:32 -t 37 -i Example.mp4 -ss 0:2:29 -t 99 -i Example.mp4  -ss 0:0:0 -c copy ~/Downloads/ExampleOut.mp4 


  


  to no avail

  


  Please help out guide the correct one

  


• FFMPEG - Is it possible to reencode only some parts of a video

  1er mai 2021, par Maxou

  I'm using ffmpeg to create a HLS stream but if the video is already in x264 then I do not re-encode the video, however if the video's bitrate is not constant sometimes I got a buffer exception.

  


  I was wondering if it was possible to check the bitrate of the sequence that is being created and if it overflows a certain value only re-encode that sequence with a lower bitrate.

  


  Currently, I use this command

  


  ffmpeg -i test.mkv -map 0:v:0 -hls_list_size 0 -f hls -hls_time 2 -muxdelay 0 -vcodec copy -hls_segment_filename "seq-%d.ts" "index.m3u8"


  


  Thanks

  


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

  9 septembre 2015, par bobafetta

  I have a ton of videos I need to convert from mp4 to wmv using ffmpeg and break up each file into 10 minute segments, but I am a total cmd scripting newb (in fact, I am a scripting newb :)

  After spending six hours trying to find an answer, I thought I would bring it to you guys.

  The code I have is working a little bit, but I need to be able to read data coming from the command line and send it back into the script for evaluation. I am not sure what code ffmpeg will spit out when it is done processing a video file (when the timestamp reaches an end), but this FOR loop just keeps on trying to create new file segments even though the video is over. This is what I saw when it tried to create a new file, so I think it might work to search for this :

  frame= 0 fps=0.0 q=0.0 Lsize= 1kB time=00:00:00.00 bitrate=N/A

  This is the code I have come up with so far (Don’t laugh :)

  @echo off
  
  setlocal ENABLEEXTENSIONS
  
  setlocal ENABLEDELAYEDEXPANSION
  
  
  
  for %%a in ("*.mp4") do (
  
  set hour=00
  
  
  
  for /L %%i IN (1,1,10) do (
  
  :Beginning
  
      set /a start=%%i-1
  
          set end=%%i
  
          if !start! lss 10 set start=!start!0
  
          if !end! lss 10 set end=!end!0
  
          ffmpeg -ss !hour!:!start!:00 -i "%%a" -b:v 1500k -vcodec msmpeg4 -acodec wmav2 -t !hour!:!end!:00 "Converted\%%~na-!hour!-!start!-!end!.wmv"
  
          if end==60 CALL :Increment
  
      )   
  
  )
  
  
  
  :Increment
  
      set /a !hour!+1
  
      set %%i=1
  
      GOTO :Beginning
  
  pause

  Based on reading this thread was thinking something like this might go in the code, but not sure what to do with it :

  set "dosstring=%*"
  
  
  
  echo.!dosstring!|findstr /C:"frame=    0 fps=0.0 q=0.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A" >nul 2>&1

  Thanks so much for you help !