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• Libx264 width not divisible by 2

  1er mai 2022, par Meh Sadness

  I have this ffmpeg command :

  


  ffmpeg -framerate 1 \
-i \"path/to/background\" \
-i \"path/to/source/mp3\" \
-filter_complex \"[1:v]scale=600:-1, pad=(16/15)*iw:(16/15)*ih:(ow-iw)/2:(oh-ih)/2:white, [0:v]overlay=(W-w)/7:(H-h)/2:shortest=1,drawtext=fontsize={fontsize}:fontfile={font}:fontcolor=white:text=\'{artist} - {title}\':x=W/2+W/10.5:y=H/11,drawtext=fontsize={fontsize}:fontfile={font}:fontcolor=white:text=\'{album}\':x=W/2+W/10.5:y=2*(H/10),drawtext=fontsize={fontsize}:fontfile={font}:fontcolor=white:text=\'{date}\':x=W/2+W/10.5:y=3*(H/10),format=yuv420p\" \
-c:v libx264 \
-r 30 \
-movflags +faststart \"{output}\"


  


  It should convert the music into a video that will contain the cover art and various metadata.

  


  However, I am getting the error indicated in the title and, at the same time, various changes to the pad and scale filter unfortunately didn't work. Moreover, no matter what part of the command I change, I still get an error like this :

  


  [libx264 @ 000001581b1d7b80] width not divisible by 2 (555x260)


  


  And at the same time, the dimensions are always the same - 555x260

  


• How can I avoid an ffmpeg out of memory error

  21 mars 2021, par Silentfury

  I use ffmpeg with complex filtering. Input are different sets of FULLHD surveilance camera videos each 10 to 15 seconds long. Set size (number of videos per set) varies. To remove unchanged frames I apply mpdecimate. To avoid being triggered by moving bushes but still keep objects I want to remain, I apply a complex filter :

  


  

  • split the video (the original and a dummy to detect motion/stills)

  


  • scale the dummy down (so the 8x8-block-metric of mpdecimate matches the size of moving objects I want to keep)

  


  • add white boxes to dummy to mask unintendedly moving objects

  


  • apply mpdecimate to dummy to remove non-changing frames

  


  • scale dummy back to original size

  


  • overlay the remaining frames of dummy with matching frames of original

  


  


  All this works fine if the number of input videos is small (less than 100). The memory consupmtion of the ffmpeg process varies somewhere between 2GiB and 5GiB.

  


  If the number of input files gets larger (say 200), the memory consumption suddenly jumps to insane numbers until memory (32GiB plus 33GiB swap) runs out and ffmpeg gets killed. I can not predict if and why this happens. I have one example, where a set of 340 videos worked using 6GiB. Any other set above 100 videos I tried eats all RAM in under two minutes and dies.

  


  There is no particular error message from ffmpeg.

  


  dmesg says :

  


  Out of memory: Kill process 29173 (ffmpeg)
Killed process 29173 (ffmpeg) total-vm:66707800kB


  


  My ffmpeg command :

  


  ffmpeg -f concat -safe 0 -i vidlist -vf 'split=2[full][masked];[masked]scale=w=iw/4:h=ih/4,drawbox=w=51:h=153:x=101:y=0:t=fill:c=white,drawbox=w=74:h=67:x=86:y=49:t=fill:c=white,drawbox=w=51:h=149:x=258:y=0:t=fill:c=white,drawbox=w=13:h=20:x=214:y=103:t=fill:c=white,drawbox=w=29:h=54:x=429:y=40:t=fill:c=white,drawbox=w=35:h=49:x=360:y=111:t=fill:c=white,drawbox=w=26:h=54:x=304:y=92:t=fill:c=white,drawbox=w=48:h=27:x=356:y=105:t=fill:c=white,drawbox=w=30:h=27:x=188:y=124:t=fill:c=white,drawbox=w=50:h=54:x=371:y=7:t=fill:c=white,drawbox=w=18:h=38:x=248:y=107:t=fill:c=white,drawbox=w=21:h=51:x=242:y=33:t=fill:c=white,mpdecimate=hi=64*80:lo=64*40:frac=0.001,scale=w=iw*4:h=ih*4[deduped];[deduped][full]overlay=shortest=1,setpts=N/(15*TB),mpdecimate=hi=64*80:lo=64*50:frac=0.001,setpts=N/(15*TB)' -r 15 -c:v libx265 -preset slower -crf 37 -pix_fmt yuv420p -an result.mkv


  


  ffmpeg version 4.1.6

  


  Debian 4.19.171-2

  


  I hope that my filter can be tuned in some way that achieves the same result but doesn't eat RAM that much - but I have no clue how. Within reasonable limits, I wouldn't mind if processing time suffers. Any hints appreciated.

  


• what is the best way to conect the ffmpeg lib to the MediaCapture API in visual studio ?

  27 mai 2015, par GrailsBeginner98

  hello community i will like to use ffmpeg with the MediaCapture API resource. Can i ?
  the doubt came because ffmpeg command read from a file, or a rtsp etc...
  i will like to use the ffmpeg as a process meaning using a ffmepeg command line.
  I am still a rookie in audio video tech.. An example will be great..
  thanks