Recherche avancée

Sur d’autres sites (5941)

• Forward youtube-dl output to ffmpeg with hardware-accelerated encoding [closed]

  16 mars 2021, par Yehor

  I'm trying to download some videos from youtube and simultaneously forward those to ffmpeg for hardware decoding to h265 (just for purpose of seeing how it works).

  


  My command, that works, but uses (as I understand) software encoding :

  


  youtube-dl -o "./%(playlist)s/%(title)s.%(ext)s" --merge-output-format mkv --postprocessor-args "-c:v libx265 -c:a opus -strict experimental" "target_url"


  


  When I specify the hardware acceleration, I receive the error "Invalid argument". The command is :

  


  youtube-dl -o "./%(playlist)s/%(title)s.%(ext)s" --merge-output-format mkv --postprocessor-args "-hwaccel cuda -c:v hevc_nvenc -c:a opus -strict experimental" "target_url"


  


  What I've done wrong ?

  


  System info :

  


  

  • OS : Windows 10 x64

  


  • GPU : Nvidia GeForce 960M (installed the latest driver and CUDA) and should be supported by CUDA

  


  • latest youtube-dl and ffmpeg build

  


  


  The ffmpeg -encoders output contains 265 codecs, so they also should be supported :

  


  V..... libx265              libx265 H.265 / HEVC (codec hevc)
V..... nvenc_hevc           NVIDIA NVENC hevc encoder (codec hevc)
V..... hevc_amf             AMD AMF HEVC encoder (codec hevc)
V..... hevc_nvenc           NVIDIA NVENC hevc encoder (codec hevc)
V..... hevc_qsv             HEVC (Intel Quick Sync Video acceleration) (codec hevc)


  


• avformat/iamf : byteswap values in OpusHeader

  16 juillet 2024, par James Almer

  avformat/iamf : byteswap values in OpusHeader
  Clause 3.11.1 of IAMF[1] states the values are stored in big endian, in
  
  contrast to the Ogg Encapsulation for Opus[2] where they are in little endian.
  [1]https://aomediacodec.github.io/iamf/v1.0.0-errata.html#opus-specific
  
  [2]https://datatracker.ietf.org/doc/html/rfc7845#section-5.1
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/iamf_parse.c
  • [DH] libavformat/iamf_writer.c
  • [DH] tests/ref/fate/iamf-5_1-copy
  • [DH] tests/ref/fate/iamf-5_1-demux

• FFmpeg send duplicate frames until input have have new frames

  16 mai 2020, par Zahid Nisar

  I am feeding MKV file into ffmpeg using stdin the mkv has h264 and opus codecs in it I want to send this to rtmp the mkv is genrated at run time 
the problem is that some time mkv pause for a time at this time I want to send last frame to rtmp server I am doing this as following but no result

  



  streamer = spawn(ffmpegPath, ['-y', '-i', '-', '-i', '-', '-f', 'lavfi', '-i', 'nullsrc=s=1280x720:d=35:r=25', '-vcodec', 'libx264', '-preset', 'medium', '-g', '20', '-r', '30', '-b:v', '2500k', '-acodec', 'aac', '-b:a', '128K', '-ac', '1', '-bufsize', '512k',
                    '-filter_complex', '[1:v][0:v]overlay[video]', '-map', '[video]', '-map', '0:a', '-f', 'flv', "rtmp://x.x.x.x/cc/"]);