Recherche avancée

Sur d’autres sites (3988)

• Revision e343988f9d : asm_*_offsets to define variables as constants This change is to allow obj_int_

  24 mai 2012, par Alpha Lam

  Changed Paths : Modify /vpx_ports/asm_offsets.h asm_*_offsets to define variables as constants This change is to allow obj_int_extract to extract all integers in the data segment. With the const keyword these variables are forced into the .rodata segment even for zero variable value. We had a (...)

• Transcode each stream in a different thread with ffmpeg

  30 mai 2018, par hedgar2017

  Is there a way of forcing ffmpeg to encode each audio stream in a different thread ?

  ffmpeg
  
      -i audio1.ac3 -c:a libopus
  
      -i audio2.ac3 -c:a libopus
  
      -i audio3.ac3 -c:a libopus
  
      output.mkv

  I mean only ffmpeg’s own instruments, without multiple processes and other OS features.

  Normally, there is only one core saturated, so encoding a file with many audio streams is very long.

  Exact command :

  ffmpeg -loglevel verbose
  
      -i 'Ярость (Fury).mkv'
  
      -i 'Fury (2014) [Ukr & Eng, Sub Eng] BDRip-AVC [Hurtom & HELLYWOOD].mkv'
  
      -threads 0 -max_muxing_queue_size 65536 -avoid_negative_ts 1 -metadata title=2014.Fury.BDRip.HEVC.1080p
  
      -map 0:0 -c:v copy -metadata:s:v:0 title=2014.Fury.BDRip.HEVC.1080p -disposition:v:0 +defaug-[forced
  
      -map 0:2 -c:a libopus -application audio -vbr on -packet_loss 0 -frame_duration 20 -mapping_family 255 -compression_level 10 -metadata:s:a:0 language=eng -metadata:s:a:0 title=Original -disposition:a:0 +defaug-[forced
  
      -map 1:1 -c:a libopus -application audio -vbr on -packet_loss 0 -frame_duration 20 -mapping_family 255 -compression_level 10 -metadata:s:a:1 language=ukr -disposition:a:1 -default-forced
  
      -map 0:1 -c:a libopus -application audio -vbr on -packet_loss 0 -frame_duration 20 -mapping_family 255 -compression_level 10 -metadata:s:a:2 language=rus -metadata:s:a:2 title=Dub -disposition:a:2 -default-forced
  
      -map 0:10 -c:s copy -metadata:s:s:0 language=eng -metadata:s:s:0 title=Original -disposition:s:0 -default-forced
  
      -f matroska ./2014.Fury.BDRip.HEVC.1080p.mkv

  Log :

  ... inputs ...
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:2 -> #0:1 (dts (dca) -> opus (libopus))
  
    Stream #1:1 -> #0:2 (ac3 (native) -> opus (libopus))
  
    Stream #0:1 -> #0:3 (ac3 (native) -> opus (libopus))
  
    Stream #0:10 -> #0:4 (copy)
  
  Press [q] to stop, [?] for help
  
  [graph_2_in_0_1 @ 0000019ca2cb29c0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x60f
  
  [format_out_0_3 @ 0000019ca2cb20c0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_3'
  
  [auto_resampler_0 @ 0000019ca2cb27c0] ch:6 chl:5.1(side) fmt:fltp r:48000Hz -> ch:6 chl:5.1(side) fmt:flt r:48000Hz
  
  [libopus @ 0000019ca2c9f3c0] No bit rate set. Defaulting to 384000 bps.
  
  [graph_0_in_0_2 @ 0000019ca2cb1ac0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x60f
  
  [format_out_0_1 @ 0000019ca2cb1bc0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_1'
  
  [auto_resampler_0 @ 0000019ca2cb14c0] ch:6 chl:5.1(side) fmt:fltp r:48000Hz -> ch:6 chl:5.1(side) fmt:flt r:48000Hz
  
  [libopus @ 0000019ca292c980] No bit rate set. Defaulting to 384000 bps.
  
  [graph_1_in_1_1 @ 0000019ca2cb2bc0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x60f
  
  [format_out_0_2 @ 0000019ca2cb26c0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_2'
  
  [auto_resampler_0 @ 0000019ca2cb0dc0] ch:6 chl:5.1(side) fmt:fltp r:48000Hz -> ch:6 chl:5.1(side) fmt:flt r:48000Hz
  
  [libopus @ 0000019ca292e980] No bit rate set. Defaulting to 384000 bps.
  
  Output #0, matroska, to './2014.Fury.BDRip.HEVC.1080p.mkv':
  
    Metadata:
  
      DATE_RELEASED   : 2014
  
      title           : 2014.Fury.BDRip.HEVC.1080p
  
      Released by     : Buba5473 for NNM-Club
  
      Copyright       : Encoded by Goor80
  
      encoder         : Lavf58.12.100
  
      Chapter #0:0: start 0.000000, end 478.228000
  
      Metadata:
  
        title           : Chapter 01
  
      ... chapters ...
  
      Stream #0:0: Video: hevc (Main 10), 1 reference frame, yuv420p10le(tv), 1920x800 (0x0) [SAR 1:1 DAR 12:5], q=2-31, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1(eng): Audio: opus (libopus) ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 5.1(side), flt, delay 312, 384 kb/s (default)
  
      Stream #0:2(ukr): Audio: opus (libopus) ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 5.1(side), flt, delay 312, 384 kb/s
  
      Stream #0:3(rus): Audio: opus (libopus) ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 5.1(side), flt, delay 312, 384 kb/s
  
      Stream #0:4(eng): Subtitle: subrip
  
  [matroska @ 0000019ca2d17f00] Starting new cluster due to timestamp=6175.5kbits/s speed=10.2x
  
  [matroska @ 0000019ca2d17f00] Starting new cluster due to timestamp=7530.8kbits/s speed=8.74x
  
  [matroska @ 0000019ca2d17f00] Starting new cluster due to timestamp=7955.1kbits/s speed=9.02x
  
  frame=156607 fps=205 q=-1.0 size= 8321971kB time=01:48:51.85 bitrate=10437.1kbits/s speed=8.55x
  
  ... not finished yet ...

  fps is always around 3000/number_of_audio_channels, meaning all audio transcoding is done with the only thread.

• Anyone know of a set of C# bindings for FFMPEG ?

  31 août 2011, par MikeJ

  Does anyone know of a set of bindings for C# to drive the FFMpeg library directly ? I could shell to ffmpeg.exe directly but I found it hard to sync/control as a separate process. any help would be appreciated.