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• FFMPEG : Transcode H265 10-bit to H264 8-bit without color loss

  24 novembre 2020, par Abhinandan Chakraborty

  I'm testing FFMPEG on my server. I'm trying to transcode H265 10-bit to H264 8-bit to support playing the video on all major web browser.

  


  1. This is the first command :

  


  ffmpeg -i 4K.ts -c:a aac -c:v h264 -crf 19 -preset ultrafast out.mp4


  


  Result : Video only playable on VLC media player. Doesn't play on any browser

  


  2. Then I tried using this command :

  


  ffmpeg -i 4K.ts -c:a aac -c:v h264 -crf 19 -profile:v main -preset ultrafast -vf "format=yuv420p" out.mp4


  


  Result : Video is playable everywhere but massive color loss.

  


  3. Then I tried another command :

  


  ffmpeg -i 4K.ts -c:a aac -c:v h264 -crf 19 -profile:v main -preset ultrafast -vf "format=yuvj420p" out.mp4


  


  Result : Video is playable everywhere but increased color range

  


  I don't know if I am missing anything or If I should completely disallow users to upload video with 10-bit depth. Any help will be greatly appreciated

  


  If anyone interested in the video which I am testing on then here is the link : https://drive.google.com/uc?export=download&id=1pGsnknkoIDRPKrW-YPFS7U31J09PeM4N

  


  I followed through many google results to come up with these command, Some of them are :

  


  

  1. FFMPEG Transcode H265 video from 10-bit to 8-bit

  


  2. https://blender.stackexchange.com/questions/73743/lossless-10-bit-colorspace-yuvj420p-video-output

  


  3. https://askubuntu.com/questions/922563/set-bit-depth-in-ffmpeg-encoding-for-hevc

  


  


• FFMPEG : Transcode UHD H265 to SDR H264 without color loss

  29 juin 2021, par Abhinandan Chakraborty

  I'm testing FFMPEG on my server. I'm trying to transcode H265 10-bit to H264 8-bit to support playing the video on all major web browser.

  


  1. This is the first command :

  


  ffmpeg -i 4K.ts -c:a aac -c:v h264 -crf 19 -preset ultrafast out.mp4


  


  Result : Video only playable on VLC media player. Doesn't play on any browser

  


  2. Then I tried using this command :

  


  ffmpeg -i 4K.ts -c:a aac -c:v h264 -crf 19 -profile:v main -preset ultrafast -vf "format=yuv420p" out.mp4


  


  Result : Video is playable everywhere but massive color loss.

  


  3. Then I tried another command :

  


  ffmpeg -i 4K.ts -c:a aac -c:v h264 -crf 19 -profile:v main -preset ultrafast -vf "format=yuvj420p" out.mp4


  


  Result : Video is playable everywhere but increased color range

  


  I don't know if I am missing anything or If I should completely disallow users to upload video with 10-bit depth. Any help will be greatly appreciated

  


  If anyone interested in the video which I am testing on then here is the link : https://drive.google.com/uc?export=download&id=1pGsnknkoIDRPKrW-YPFS7U31J09PeM4N

  


  I followed through many google results to come up with these command, Some of them are :

  


  

  1. FFMPEG Transcode H265 video from 10-bit to 8-bit

  


  2. https://blender.stackexchange.com/questions/73743/lossless-10-bit-colorspace-yuvj420p-video-output

  


  3. https://askubuntu.com/questions/922563/set-bit-depth-in-ffmpeg-encoding-for-hevc

  


  


• How to transcode to another video parameters ? [on hold]

  23 mai 2014, par user3668381

  Google, man pages and any docs I found didn t shown anything relevant so...

  I want to be able to concatene video with ffmpeg, this part is simple, but fail (freeze or massive frame dropping) if the videos don t have the same properties.

  But for now, I didn t found anything else but trying to set a lot of options, expecting to get the good properties... But when they aren t rounded down (or up), you just can t set them (tbr, tbn...).

  So my question is, is there any hidden option in ffmpeg to take the properties of another video (so -copy won t work) as the properties of the transcode.

  Illustration :

  This is the video from which I wan t to copy the parameters :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cdr.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 2013-07-04 11:04:27
  
      encoder         : Lavf54.11.100
  
    Duration: 00:06:26.96, start: 0.000000, bitrate: 804 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 854x480 [SAR 1280:1281 DAR 16:9], 753 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2013-07-04 11:04:27
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 44 kb/s (default)
  
      Metadata:
  
        creation_time   : 2013-07-04 11:04:27
  
        handler_name    : SoundHandler
  
  At least one output file must be specified

  For now, my command is ffmpeg -i video.mp4 -c:v h264 -c:a libfdk_aac -aspect 16:9 -b:v 753k -b:a 44k output.mp4

  But it turn out that output.mp4 reveal :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.21.100
  
    Duration: 00:00:07.11, start: 0.046440, bitrate: 685 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 854x480 [SAR 1280:1281 DAR 16:9], 637 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 45 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  At least one output file must be specified

  As we can see, audio bitrate is rounded, tbn is off the chart, general bitrate isn t the same and on and on and on...

  Is there any better way but to add options again and again and hope that nothing will be rounded ? Something like ffmpeg -i video.mp4 -use_properties_of model.mp4 output.mp4 ?