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• Speed advantage in combining FFmpeg filters?

  4 May 2020, by lach_codes

  I'm currently using five separate FFmpeg processes to do the following:

  



  

  1. trim & crop Vid B

  


  2. scale Vid B to height of Vid A

  


  3. combine Vid B & Vid A

  


  4. add a fade-in/fade-out to Combined Vid

  


  5. add an overlay to fade in/out vid

  


  



  I have them all set to ultrafast but it still takes a long time - about 40 seconds when each video is 10 seconds long.

  



  I initially explored combining some of the filters but couldn't get it working in the timeframe I had available. I also wasn't sure if the time spent figuring out how to combine all the filters would pay off in a faster processing time.

  



  Any thoughts/insights from you brilliant FFmpeg gurus? Would this speed up processing, and if so, should I combine all the commands together or are there some I should combine and others I should leave separate?

  



  Here are my current commands, all of which are working:

  



  // trimming 200ms off begining of vid B + cropping frame (note that I have previously retrieved dimensions and duration of both videos with ffprobe)
1. `ffmpeg -i vidB.mov -ss 200 -t ${vidB.duration} -async 1 -filter:v "crop=iw:${vidB.croppedHeight}:0:${vidB.offset}" -preset ultrafast -c:a copy croppedVidB.mov`

// scale Vid B up to Vid A's height
2. `ffmpeg -i croppedVidB.mov -vf scale=-2:${vidA.height} vidBScaled.mov`

// combine videos
3. `ffmpeg -i vidA.mov -i vidBScaled.mov -filter_complex "[0:v][1:v] hstack=inputs=2[v]; [0:a][1:a]amix[a]" -map "[v]" -map "[a]" -preset ultrafast -ac 2 combined.mov`

// add fade in & out
4. `ffmpeg -i combined.mov -sseof -1 -copyts -i combined.mov -filter_complex "[1]fade=out:0:30[t];[0][t]overlay,fade=in:0:30[v]; anullsrc,atrim=0:1[at];[0][at]acrossfade=d=1,afade=d=1[a]" -map "[v]" -map "[a]" -c:v libx264 -crf 22 -preset ultrafast -shortest fadeInOut.mov`

// add overlay
5. `ffmpeg -i fadeInOut.mov -i overlay.png -filter_complex overlay=W-w-10:H-h-10 -codec:a copy -preset ultrafast -async 1 overlay.mov`


  



  Thanks in advance for your thoughts!

  


• FFMPEG Combining Two Commands Into One

  12 October 2018, by Sie

  Im currently trying to combine trim and delogo together, looked over a few tutorials but i just have no clue.

  trim:

  ffmpeg -i input.mp4 -ss 00:00:05 -t  00:00:10 -async 1 ouput.mp4

  delogo:

  ffmpeg -i input.mp4 -vf "delogo=x=1075:y=9:w=170:h=52" -c:a copy ouput.mp4

  I want to combine these two commands so i can run one execution which will do both within, instead of 2 separate commands

• lavc: add a ProRes RAW parser

  11 July, by Lynne

  lavc: add a ProRes RAW parser
  Simple parser that only parses frame information.
  
  This helps avoid requiring the software decoder on init to decode a
  
  single frame, since the decoder can be quite slow.
  

  • [DH] libavcodec/Makefile
  • [DH] libavcodec/parsers.c
  • [DH] libavcodec/prores_raw_parser.c
  • [DH] libavformat/mov.c