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• FFMPEG : Convert multiple movies into plex direct play format

  4 avril 2021, par Sascha

  I have a large movie base which I watch over plex (Apple TV plex client with raspberry 4 plex server). However, for standardization and to ensure better direct play with plex, I wanted to convert the movies/series to new format.

  


  Therefore, my idea was to convert all movies to

  


  

  1. 1080p (1920*1080) / 16:9

  


  2. 30 fps

  


  3. mkv container

  


  4. H.264 (libx264)

  


  5. 8 bit Video Depth

  


  6. 320 kbps audio AAC

  


  7. keep only German and English version (audio / subtitle)

  


  


  which seems to be good settings for sustainable standardization. Dont know, if other settings (e.g. hevc) would be better. However, I can't combine the commands with the right ffmpeg options to let my server convert in the background. By now, I came up with the following two commands, which I want to combine, once ffmpeg gives me the right output, which it does not at the moment. It breaks in the conversion process and does not keep only German and English subtitles and audio. I

  


  Hope someone can help me out. Thanks a lot.

  


  find . -name '*.mp4' -or -name '*.wav' -exec ffmpeg -i {} basename {}.mkv \; -exec rm {} \;

for f in *.mkv; do echo "Starting with ${f} @ $(date +%T)"; ffmpeg -hide_banner -i "${f}" -map_metadata:g -1 -movflags faststart -c:v libx264 -preset slow -crf 20 -pix_fmt yuv420p -vf scale=1920:-1,setdar=16/9 -filter:v fps=fps=30 -c:a aac -b:a 320k -map0:s "${f}.2.mkv"; echo "Finished with ${f} @ $(date +%T)"; done


  


• How to capture a layered window with transparency background properly ? (using BitBlt)

  25 octobre 2016, par Mitra M

  I want to capture a WPF window (WPF layered window) with transparency background.

  To do that I tried FFmpeg, But :

  1 - If I set AllowTransparency (this is a property of WPF window) to false ,I can capture the window by gdigrab (this is an ffmpeg device), but output has black background.(I don’t want black background)

  2 - If I set AllowTransparency to true then gdigrab won’t work. (get black frame only)

  I have read David’s nice article, he has said :

  if you use BitBlt to do this, you could “or in” the CAPTUREBLT flag if
  you wanted to capture windows that are layered

  The gdigrab uses BitBlt, this is gdigrab.c code snippet :

  /* Blit screen grab */
  
      if (!BitBlt(dest_hdc, 0, 0,
  
                  clip_rect.right - clip_rect.left,
  
                  clip_rect.bottom - clip_rect.top,
  
                  source_hdc,
  
                  clip_rect.left, clip_rect.top, SRCCOPY | CAPTUREBLT)) {
  
          WIN32_API_ERROR("Failed to capture image");
  
          return AVERROR(EIO);
  
      }

  You can see the flags . (SRCCOPY | CAPTUREBLT).

  Please tell me :

  1- Why the gdigrab can not capture a WPF window properly ?

  2 - What changes in this code should be done to do this ?

  (Sorry for my English, I used translate.google)

  Thanks

• ffmpeg use complex_filter with alphamerge only for a part of the video

  7 mars 2019, par Andy P

  I am trying to apply a filter to only the first few seconds of a video clip - and leave the rest of the video unchanged.

  why ?
  I got some video clips that I wanted to put on a website - unfortunatelly those clips are starting with a black background, which does not fit the website’s design. Therefor I was changing the background to transparent.

  I got that filter working from many of the great answers here (thanks to Gyan) and those videos are playing fine in common browsers :

  ffmpeg -i ${1} -filter_complex "[0]split[m][a];
  
  [a]geq='if(lt(lum(X,Y),16),0,255)',hue=s=0[al];
  
  [m][al]alphamerge,format=yuva420p" -c:v libvpx-vp9 -b:v 0 -crf 18 -an -auto-alt-ref 0 ${1}.webm

  the problem now : of course this replaces all black pixels during the video, which leads to many artefacts later on. Therefor I am searching for a way to apply that filter only to the first 5-ish seconds.

  I think I need a second split and a crop or a trim and a concat filter with a timestamp - but I can’t make it work :(

  ffmpeg -i ${1} -filter_complex "[0]split[f][s];
  
  [f]trim=start=0,duration=5[ft];
  
  [s]trim=start=6[st];
  
  [st]split[m][a];
  
  [a]geq='if(lt(lum(X,Y),16),0,255)',hue=s=0[al];
  
  [m][al]alphamerge,format=yuva420p[mal];
  
  [ft][mal]concat" -c:v libvpx-vp9 -b:v 0 -crf 18 -an -auto-alt-ref 0 ${1}.webm

  /edit : I am changing the subject slighty, to reflect the actual problem.