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• Revision f2b978e895 : Use normal rate_correction_factor for gf in CBR mode I0c5f010 changed to allow

  10 novembre 2014, par Yaowu Xu

  Changed Paths :
   Modify /vp9/encoder/vp9_ratectrl.c

  
  
  Use normal rate_correction_factor for gf in CBR mode

  I0c5f010 changed to allow update golden reference buffer in CBR mode,
  this commit changes the use of rate_correction_factor for those frames
  to be aligned with the new usage. This commit attempts to solve two
  issues :

  a. Initialization of rate correction factor for Golden Frame
  Prior to this patch, even the regular inter frame has been update
  the rate correction factor based on content and encoding results,
  the first golden frame would still use the ininitialized value
  that can be way off.

  b. Allowing rate correction factor update to be slightly faster
  Prior to this patch, when the rate correction factor is off, the
  update to the factor is too slow, the factor could not get close
  to a semi-correct value even after many frames.

  The commit helps all clips in psnr/ssim metric, but especially to
  a few clip in RTC set that rate correction was way off. For example
  thaloundeskmtgvga gained about .5dB for both overall/average psnr.

  Change-Id : I0be5c41691be57891d824505348b64be87fa3545

• Pick 2 lang stream and one video ffmpeg

  7 juin 2023, par Gwildor

  Please help me. I have try alot of diffrent code to get this to work, but i can't fix it. So now im going to try to get pro help from you :)

  


  I use this code, it works perfect, but it select all audio stream from eng and swe. How can i get only ony stream of eng and swe audio and one video ?

  


  for f in /mnt/re-encode/*/*.mkv_; do /usr/local/bin/ffmpeg -fflags +igndts -analyzeduration 2147483647 -probesize 2147483647 \ -hide_banner -sn -err_detect ignore_err -init_hw_device vaapi=foo:/dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_device foo -i "$f" \ -b:v 6M -minrate 6M -maxrate 6M -bufsize 6M \ -profile:v 100 -level 41 -bf 0 -r film -sn -movflags +faststart+write_colr+prefer_icc \ -map 0:v:0 -map 0:a:m:language:eng? -map 0:a:m:language:swe? -filter_hw_device foo -vf "deinterlace_vaapi,scale_vaapi=w=-2:h=720,hwdownload,format=nv12|vaapi,subtitles='${f%.*}.srt',hwupload" -c:v h264_vaapi \ -c:a:0 aac -ac 2 -af "volume=2" -b:a 256k \ -f mp4 -y -hide_banner "${f%.*}_b.mp4_"

  


  I have tryc pipe : and /dev/null

  


• video compression using ffmpeg not working save as empty file after conversion

  25 mars 2019, par HEMANTH KUMAR

  I’m using CodeIgniter and also installed FFmpeg

  I have converted the big size video to small size and it worked in localhost.

  On the live server it’s converting but saving has an empty file.

  $v = '/var/www/html/login/public/restaurants/171/items/'.$rowv->item_id.'/'.$rowv->image;              
  
  $info = pathinfo($rowv->image);
  
  $v2 ='/var/www/html/login/public/restaurants/171/items/'.$rowv->item_id.'/'.'demo'. '.' . $ext;
  
  
  
  
  
  $a = exec("ffmpeg -y -loglevel error -i ".$v." -vcodec libx264 -crf 28 -preset faster -tune film ".$v2);