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• avcodec/vulkan_video : Merge dec part of FFVkCodecMap and extension props

  7 mars 2024, par Andreas Rheinhardt

  avcodec/vulkan_video : Merge dec part of FFVkCodecMap and extension props
  All the fields of FFVkCodecMap are either decoder-only
  
  or encoder-only (with the latter being unused and unset for now).
  
  Yet there is already a per-decoder struct containing
  
  static information about these decoders, namely
  
  VkExtensionProperties.
  This commit merges the decoder-parts of FFVkCodecMap
  
  with the VkExtensionProperties into a common structure.
  Given that FFVkCodecMap is now unused, it is removed.
  Reviewed-by : Lynne <dev@lynne.ee>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/vulkan_av1.c
  • [DH] libavcodec/vulkan_decode.c
  • [DH] libavcodec/vulkan_decode.h
  • [DH] libavcodec/vulkan_h264.c
  • [DH] libavcodec/vulkan_hevc.c
  • [DH] libavcodec/vulkan_video.c
  • [DH] libavcodec/vulkan_video.h

• ffmpeg use complex_filter 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

• avfilter/yadif_common : factorize some part of the config_output and the uninit functions

  25 janvier 2024, par Marton Balint

  avfilter/yadif_common : factorize some part of the config_output and the uninit functions
  This unifies slightly diverged code and ensures that cc_fifo is always initialized.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavfilter/vf_bwdif.c
  • [DH] libavfilter/vf_bwdif_cuda.c
  • [DH] libavfilter/vf_bwdif_vulkan.c
  • [DH] libavfilter/vf_yadif.c
  • [DH] libavfilter/vf_yadif_cuda.c
  • [DH] libavfilter/vf_yadif_videotoolbox.m
  • [DH] libavfilter/yadif.h
  • [DH] libavfilter/yadif_common.c