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• Speed advantage in combining FFmpeg filters ?

  4 mai 2020, par 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 !

  


• Revision fc7cbd1f60 : VP9_COMMON -> VP10->COMMON Change-Id : I651b7bee90f33581368853da81f9622805ccc0ea

  13 août 2015, par Yaowu Xu

  Changed Paths :
   Modify /vp10/common/alloccommon.c

  
   Modify /vp10/common/debugmodes.c

  
   Modify /vp10/common/entropy.c

  
   Modify /vp10/common/entropymode.c

  
   Modify /vp10/common/entropymv.c

  
   Modify /vp10/common/loopfilter.c

  
   Modify /vp10/common/mfqe.c

  
   Modify /vp10/common/mvref_common.c

  
   Modify /vp10/common/mvref_common.h

  
   Modify /vp10/common/onyxc_int.h

  
   Modify /vp10/common/postproc.c

  
   Modify /vp10/common/pred_common.c

  
   Modify /vp10/common/pred_common.h

  
   Modify /vp10/common/thread_common.c

  
   Modify /vp10/common/tile_common.c

  
   Modify /vp10/decoder/decodeframe.c

  
   Modify /vp10/decoder/decodemv.c

  
   Modify /vp10/decoder/decoder.c

  
   Modify /vp10/decoder/decoder.h

  
   Modify /vp10/decoder/dthread.c

  
   Modify /vp10/encoder/aq_complexity.c

  
   Modify /vp10/encoder/aq_cyclicrefresh.c

  
   Modify /vp10/encoder/aq_variance.c

  
   Modify /vp10/encoder/bitstream.c

  
   Modify /vp10/encoder/context_tree.c

  
   Modify /vp10/encoder/encodeframe.c

  
   Modify /vp10/encoder/encodemv.c

  
   Modify /vp10/encoder/encodemv.h

  
   Modify /vp10/encoder/encoder.c

  
   Modify /vp10/encoder/encoder.h

  
   Modify /vp10/encoder/ethread.c

  
   Modify /vp10/encoder/firstpass.c

  
   Modify /vp10/encoder/mbgraph.c

  
   Modify /vp10/encoder/picklpf.c

  
   Modify /vp10/encoder/pickmode.c

  
   Modify /vp10/encoder/quantize.c

  
   Modify /vp10/encoder/ratectrl.c

  
   Modify /vp10/encoder/rd.c

  
   Modify /vp10/encoder/rdopt.c

  
   Modify /vp10/encoder/segmentation.c

  
   Modify /vp10/encoder/segmentation.h

  
   Modify /vp10/encoder/skin_detection.c

  
   Modify /vp10/encoder/speed_features.c

  
   Modify /vp10/encoder/temporal_filter.c

  
   Modify /vp10/encoder/tokenize.c

  
   Modify /vp10/vp10_dx_iface.c

  
  
  VP9_COMMON -> VP10->COMMON

  Change-Id : I651b7bee90f33581368853da81f9622805ccc0ea

• Revision 38415 : Un boutons dans le menu de statitiques menant vers les activités du ...

  28 mai 2010, par kent1@… — Log

  Un boutons dans le menu de statitiques menant vers les activités du journal On commence à factoriser pour faire des visites sur objet/id_objet