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• FFMPEG filter_complex wih speedup and subtitles and scaling

  11 décembre 2015, par Sambir

  Hi I am trying to convert a file to a specific framerate and remove any jittering, jumping of the screen. I also try to boost the volume and add a subtitle overlay. I get an error with the curent line than it is not allowed to use complex_filter in combination with vf and af. as an extra I also would like to add text in the left corner (this i did not try yet) and would want the screen to be sized to full hd (changed scale to 1920:1080 but no succes).

  ffmpeg -i movie.mp4 -r 25 -filter_complex "[0:v]setpts=0.959*PTS[v];[0:a]atempo=1.0427[a]" -map "[v]" -map "[a]" -vf subtitles=sub.srt,scale=1920:1080 -af volume=2 -strict -2 -preset veryfast movie_new.mp4

  Got it !

  New :

  ffmpeg -i inside.mp4 -r 25 -filter_complex "[0:v]setpts=0.959*PTS[i];[i]scale=1920:1080[j];[j]subtitles=inside.srt[k];[0:a]atempo=1.0427[p];[p]volume=2[q]" -map "[k]" -map "[q]" -strict -2 -preset veryfast inside_new.mp4

  But now there is a new issue. Subs out of sync :P is there a easy fix for this or do i first need to encode without subs then resync then encode with subs ?

  found this link by the way Subtitle Resync Tool

  moviespeed is changed by 0.959. is there a calculation i can do to adjust the subtitles by x miliseconds ?

  EDIT : Got the subtitles fixed with subtitle workshop. Was just a small setting to change which directly shifted all the text :)

• Proportion for the values of maxrate, mnrate and bufsize for encoding videos for streaming purpose and past duration too large warning

  15 décembre 2015, par himanshu nautiyal

  can you please tell me about minrate, maxrate and bufsize. And is it necessary to give maxrate and minrate for encoding videos for streaming purpose. Actually I understood the meaning and functions of minrate, maxrate and bufsize through ffmpeg documents but I am not finding any solution of what would be difference in between the values of these three.

  for example : I am using this command
  ffmpeg -y -i testing.mp4 -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -r 24 -g 24 -b:v 2m -maxrate 1m -bufsize 1m -vf scale=1920*1080 aa.mp4

  but I am not sure if this -b:v 2m -maxrate 1m bufsize 1m is in correct propotions or not. My output is fine but I don’t want any problem on working real time. Moreover, I am also getting the following warning

  Past duration 0.634361 too large
  Past duration 0.674370 too large
  Past duration 0.714363 too large 0kB time=00:00:01.32 bitrate= 0.3kbits/s

  Past duration 0.754372 too large
  Past duration 0.794365 too large
  Past duration 0.834373 too large
  Past duration 0.874367 too large
  Past duration 0.914360 too large
  Past duration 0.954369 too large

  thanks in advance

• Running list of cmd.exe commands from maya in Python

  17 décembre 2015, par user3541686

  I am writing a maya python script to batch render a scene into jpgs then use ffmpeg to turn them into a mov. Currently the script saves a string of commands as a bat file which works fine but I’d prefer to just run cmd.exe from maya and execute the list of commands without creating that bat first.

  I’ve been reading about "subprocess.popen()" but I can’t figure out how to get it to iterate through each line, run that command, then move onto the next one when done ie :

  1) Run maya render.exe & save scene as jpegs

  2) ffmpeg jpgs to mov

  I’ve shortened the directories but its essentially this :

  `C:\PROGRA~1\Autodesk\Maya2015\bin\Render.exe -r hw2 -s 100 -e 200 -of jpg -fnc 7 -x 1920 -y 1080 -rd 
  
  "C:\RENDER" 
  
  "C:\SCENE.ma" ffmpeg -y -r 25 -start_number 0100 -i C:\SCENE_%%04d.jpg C:\SCENE.mov

  How would I be able to do this ?

  Thanks !