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• Laravel FFMPEG, converting large video on smaller EC2 instances

  30 août 2019, par Jeremy Layson

  I’m using ffmpeg on a laravel project (uploaded on AWS Elastic Beanstalk using t3.micro for now). My problem is that my budget can only go for t3.small but sometimes, I’ll have to process large video files like 2GB or even 5GB.

  My current set-up can process smaller files like 30MB and convert them to M3U8 (HLS) so there’s no problem with the set-up. The problem arises when I’m trying to upload and convert a 2GB file as my EC2 instance only has 1GiB of memory.

  Is there a way for FFMPEG (pbmedia/laravel-ffmpeg) to "chunk" the conversion so that it uses less memory ? Doesn’t matter if it takes double the time to convert.

• FFmpeg - ANR on large files when mixing video and audio

  8 août 2019, par spaceman12

  This command

  ffmpeg -i video.webm -i audio.m4a -c copy output.mkv

  will always produce an ANR error in android at the end of the conversion for any large files, say greater than 700mb.

  The ANR error is produced only at the finishing end of the conversion process after the output has been successfully generated, not in the middle or at the beginning etc.

  So I suspect it has got to do with some I/O stuff at the end.
  Can someone please shed some light into this, and help eliminate this ANR problem ?

• Revision a0043c6d30 : Enhance the transform skipping decision-making in non-rd mode For large partiti

  25 mars 2015, par Yunqing Wang

  Changed Paths :
   Modify /vp9/encoder/vp9_pickmode.c

  
  
  Enhance the transform skipping decision-making in non-rd mode

  For large partition blocks(block_size > 32x32), the variance
  calculation is modified so that every 8x8 block’s variance
  is stored during the calculation, which is used in the
  following transform skipping test. Also, the variance for
  every tx block is calculated. The skipping test checks all tx
  blocks in the partition, and sets the skip flag only if all tx
  blocks are skippable. If the skip flag of Y plane is 1, a
  quick evaluation is done on UV planes. If the current partition
  block is skippable in YUV planes, the mode search checks fewer
  inter modes and doesn’t check intra modes.

  The rtc set borg test(at speed 6) showed that :
  Overall psnr : -0.527% ; Avg psnr : -0.510% ; ssim : -0.573%.
  Average single-thread speedup on rtc set was 3.5%.
  For 720p clips, more speedups were seen.
  gipsrecmotion : 13%
  gipsrestat : 12%
  vidyo : 5 - 9%
  dark : 15%
  niklas : 6%

  Change-Id : I8d8ebec0cb305f1de016516400bf007c3042666e