Recherche avancée

Sur d’autres sites (18173)

• Double subtitles when hardcoding from .mkv container

  4 novembre 2022, par Goran Hinic

  I'm trying to hardcode subtitles into a file that's in .mkv container, using one of the subtitle strams from the container. I want subtitles to have a black background on them. I'm also trying to keep 10bit encoding and preserve high quiality. Result is ok, except that all subtitles are doubled. So there is a layer of good subtitles in white on black background, and also, half of the font size down, same subtitles in black. Can someone point out the issue with my command ?
Thank you.

  


  Ran this command :

  


  


  ffmpeg -i movie.mkv -vf "subtitles=movie.mkv:si=0:force_style='OutlineColour=&000000000,BorderStyle=3,Outline=3,Shadow=0,MarginV=20'" -c:v libx265 -crf 23 -preset slow -x265-params profile=main10 -c:a copy movie_subs.mkv

  


  


  Expected : White subtitles on black background
Actual : White subtitles on black background with black subtitles half font size down

  


• swscale/aarch64 : dotprod implementation of rgba32_to_Y

  3 mars, par Krzysztof Pyrkosz

  swscale/aarch64 : dotprod implementation of rgba32_to_Y
  The idea is to split the 16 bit coefficients into lower and upper half,
  
  invoke udot for the lower half, shift by 8, and follow by udot for the
  
  upper half.
  Benchmark on A78 :
  
  bgra_to_y_128_c :                                       682.0 ( 1.00x)
  
  bgra_to_y_128_neon :                                    181.2 ( 3.76x)
  
  bgra_to_y_128_dotprod :                                 117.8 ( 5.79x)
  
  bgra_to_y_1080_c :                                     5742.5 ( 1.00x)
  
  bgra_to_y_1080_neon :                                  1472.5 ( 3.90x)
  
  bgra_to_y_1080_dotprod :                                906.5 ( 6.33x)
  
  bgra_to_y_1920_c :                                    10194.0 ( 1.00x)
  
  bgra_to_y_1920_neon :                                  2589.8 ( 3.94x)
  
  bgra_to_y_1920_dotprod :                               1573.8 ( 6.48x)
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libswscale/aarch64/input.S
  • [DH] libswscale/aarch64/swscale.c

• How to split and scale streams in ffmpeg with cuda ?

  30 décembre 2020, par Samyak

  So, I want to create streams of multiple resolutions for hls streaming. Here's what I've tried so far :

  


  ffmpeg -vsync 0 -hwaccel cuvid -i input.mkv -c:a aac -c:v h264_nvenc \
-c:s webvtt -crf 20 -filter_complex \
'[v:0]hwupload_cuda,split=2[vtemp001][vout002]:[vtemp001]hwupload_cuda,scale_npp=w=960:h=540:format=yuv420p:interp_algo=lanczos,hwdownload,format=yuv420p[vout001]'  \
-map "[vout001]" -b:v:0 2000k -map "[vout002]" \
-b:v:1 6000k -map 0:v -map 0:a -map 0:s -map 0:v \ 
-map 0:a -map 0:s -var_stream_map 'v:0,a:0,s:0 v:1,a:1,s:1' \ 
-force_key_frames:v "expr:gte(t,n_forced*2.000)" -hls_time 6 -hls_playlist_type event -hls_flags \
delete_segments+independent_segments+discont_start+program_date_time \
-master_pl_name master.m3u8 -hls_segment_filename \
fire/segment_%v/file%06d.ts fire/stream_%v.m3u8


  


  Running this, I am getting the following error :

  


  Impossible to convert between the formats supported by the filter 
'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:0


  


  When I do the same thing without gpu, I am getting an out of memory error which to me sounds like I can't do this without a gpu (i.e I have to run separate ffmpeg commands to get this to run on the CPU). Would love to know if anyone has any insights or suggestions.

  


  I tried something more easy to understand here :

  


  ffmpeg -vsync 0 -hwaccel cuvid -i input.mkv -c:v h264_nvenc -filter_complex \
'[v:0]hwupload_cuda,split=2[vtemp001][vout002];[vtemp001]hwupload_cuda,scale_npp=w=960:h=540:format=yuv420p:interp_algo=lanczos,hwdownload,format=yuv420p[vout001]' \
-map "[vout001]" -b:v:0 2000k output1.mkv -map "[vout002]" -b:v:1 6000k output2.mkv


  


  The above gives the same error which to me suggests that the issue is with the filter complex.