Recherche avancée

Sur d’autres sites (4483)

• lavc/qsvenc : pass the color properties to the SDK

  28 juillet 2021, par Haihao Xiang

  lavc/qsvenc : pass the color properties to the SDK
  Otherwise the color properties won't be encoded into the bitstream
  
  header
  Reviewed-by : Xiang, Haihao <haihao.xiang@intel.com>
  
  Reviewed-by : Soft Works <softworkz@hotmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/qsvenc.c
  • [DH] libavcodec/qsvenc.h

• How to change color scheme of frame extracted via FFMPEG library on C++ ?

  22 septembre 2014, par user2742299

  I have been able to decode the video file using the FFMPEG as well as to save them in *.ppm files.

  I would like to know how can I change the color of each frame soon after decoding and before saving them ?

  For example : if I have a colored frame which I decoded and extracted from the video file, I would now like to change it to black and white frame and then save it to the file.

  I am quite new to FFMPEG library and further more less documentation is available on it for developers. Therefore any help on it would be highly appreciable.

  Thanks

• Color spot in FFmpeg output

  2 juin 2022, par Fabian Garcia

  I work in a company that serves multimedia content to different clients and one of these requests that the videos contain the following specifications :

  


  

  • Codec : H264 High@4.0

  


  • Mode : CBR 1 pass

  


  • Window Buffer : 5 secs

  


  • Frame Rate : 29.97/23.97

  


  • Key Frame Interval : 2 secs

  


  • Bitrate : 4000 Kbps

  


  • Size : 1920x1080

  


  • Window Buffer : 5 secs

  


  • GOP : closed

  


  • GOP size : fixed (no scene change detection)

  


  • Window Buffer : 5 secs

  


  • B Frames : As needed

  


  


  For the above, i build following script :

  


  ffmpeg -hide_banner -nostats -loglevel error -y
-init_hw_device cuda=cuda -hwaccel cuda -hwaccel_device cuda
-i 'video_source.mxf' -filter_hw_device cuda
-filter_complex '[0:v]format=nv12,hwupload,yadif_cuda,scale_cuda=1920:1080[v0]'
-map '[v0]' -c:v h264_nvenc -rc cbr -b:v 4M -bufsize 8M -x264-params "keyint=60:min-keyint=48:no-scenecut" -r '30000/1001' -profile:v high -level:v 4
-map 0:1 -c:a libfdk_aac -b:a 96k -ar 44100 -ac 2 -sample_fmt s16
'output.mp4'


  


  The inconvenience is that the generated output presents some color spots in the scene changes (it's a fade) as can be seen in the attached image.

  


  I could notice that in the output video, the time does not match the input precisely, the output is a few milliseconds ahead, I think that the color spot corresponds to the image that should be shown at that moment in the original video.

  


  Can you see something wrong in script ? Or maybe some concept that i don't know is causing a conflict with the output (This is my first time using ffmpeg).

  


  Thank for your help !