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• avfilter/vf_bwdif : Add neon for filter_line

  4 juillet 2023, par John Cox

  avfilter/vf_bwdif : Add neon for filter_line
  Exports C filter_line needed for tail fixup of neon code
  
  Adds neon for filter_line
  Signed-off-by : John Cox <jc@kynesim.co.uk>
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavfilter/aarch64/vf_bwdif_init_aarch64.c
  • [DH] libavfilter/aarch64/vf_bwdif_neon.S
  • [DH] libavfilter/bwdif.h
  • [DH] libavfilter/vf_bwdif.c

• Reducing frames with ffmpeg leads to massive video size reaction - what´s wrong ?

  9 juin 2023, par Katharina

  I am working on a project in which I need to

  


  -transform many videos from .h264 format to .mp4

  


  -cut them after 1 hour duration

  


  -reduce the framerate from 60 fps to 30 fps

  


  Up to now, I came up with following :

  


  Convert :

  


  for %a in ("*.h264") do ffmpeg -framerate 60 -fflags +genpts -i "%a" -vcodec copy -acodec copy "%~na_Conv.mp4


  


  Cut :

  


  for %a in ("*.mp4") do ffmpeg -ss 00:00:00 -i "%a" -to 01:00:00  -vcodec copy -acodec copy "%~na_cut.mp4


  


  Reduce framerate :

  


  for %a in ("*.mp4") do ffmpeg -i "%a" -filter:v fps=fps=30 "%~na_30fps.mp4


  


  It finally seems to work fine, but I am worried, because the original file has 2.6 GB, the converted and cut video file has 2.4 GB (which I find reasonable), but the video file with 30 fps has only 340 MB. It does not seem corect, that the files got so small. However, I used fprobe to determine the framerates and it shows that the fps should be as specified. Still, I find it puzzling that the video is now so small when only half the frames were dropped. Unfortunately, looking at the videos does not give hints if too many frames were dropped.

  


  I am grateful for any advice how to find the error or how to evaluate my result properly. Thank you for your help !

  


• Ffmpeg segment doesn't show file size update in real time

  9 août 2019, par Lucas Cardoso

  I’m trying to run ffmpeg mp3 stream with segmentation for each hour. Everything is working perfectly, except for one thing : when i run the command, the file size doesn’t grow in real-time as i need, it only grows in packages of 256k.

  Is there a way to turn a "real-time mode" ?

  I’m using ubuntu 18.04 with ffmpeg 3.4.6

  This is the code i’m trying to run on linux terminal :
  ffmpeg -i http://radiocentova.conectastm.com:8363/stream -y -acodec libmp3lame -b:a 16k -ac 1 -ar 11025 -vn -strftime 1 -f segment -segment_time 3600 -flush_packets 1 @test_%Y%m%d%H%M%S+00.mp3

  Recording with segment :
  
  Recording without segment :