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• libavcodec/vaapi_decode : fix the problem that init_pool_size nb_surface

  11 janvier 2022, par Wenbin Chen

  libavcodec/vaapi_decode : fix the problem that init_pool_size < nb_surface
  For vaapi if the init_pool_size is not zero, the pool size is fixed.
  
  This means max surfaces is init_pool_size, but when mapping vaapi
  
  frame to qsv frame, the init_pool_size < nb_surface. The cause is that
  
  vaapi_decode_make_config() config the init_pool_size and it is called
  
  twice. The first time is to init frame_context and the second time is to
  
  init codec. On the second time the init_pool_size is changed to original
  
  value so the init_pool_size is lower than the reall size because
  
  pool_size used to initialize frame_context need to plus thread_count and
  
  3 (guarantee 4 base work surfaces). Now add code to make sure
  
  init_pool_size is only set once. Now the following commandline works :
  ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 \
  
   hwaccel_output_format vaapi -i input.264 \
  
   vf "hwmap=derive_device=qsv,format=qsv" \
  
   c:v h264_qsv output.264
  Signed-off-by : Wenbin Chen <wenbin.chen@intel.com>
  

  • [DH] libavcodec/vaapi_decode.c

• How to achieve 1x writing speed for 4K encoding in ffmpeg ?

  27 avril 2023, par Anand92

  Is it possible to encode 4K asset in 1x writing speed ?

  



  Below are our encoding commands and details of CPU, source assets, and encoding command output :

  



  Encoding command

  



  ffmpeg -i 4K_Source.mp4 -c:v libx265 -preset ultrafast
    -x265-params fps=60:profile=main:min-keyint=60:crf=19 -vf "scale=3840:2160"
    -sc_threshold 0 4K_UF_3840x2160_CRF19.mp4


  



  Source Asset Details

  



  Overall bit rate mode      : Constant
Overall bit rate           : 51.6 Mb/s
Format                     : HEVC
Format/Info                : High Efficiency Video Coding
Format profile             : Main 10@L5.1@High
Duration                   : 1 min 33 s
Width                      : 3 840 pixels
Height                     : 2 160 pixels
Display aspect ratio       : 16:9
Frame rate                 : 59.940 (60000/1001) FPS


  



  CPU details

  



  Intel(R) Xeon(R) CPU E7-8870 v3 @ 2.10GHz (144 core)


  



  FFMPEG command output

  



  ffmpeg version 3.2.4-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.1 (Debian 5.4.1-5) 20170205
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
  libavutil      55. 34.101 / 55. 34.101
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.101 / 57. 56.101
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
[mpegts @ 0x3a2b600] start time for stream 1 is not set in estimate_timings_from_pts
[mpegts @ 0x3a2b600] Could not find codec parameters for stream 1 (Audio:  
aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize'   
options
Input #0, mpegts, from 'Samsung_SUHD_Colorful_Food.mp4':
  Duration: 00:01:33.11, start: 1.050044, bitrate: 52076 kb/s
  Program 1
    Stream #0:0[0x101]: Video: hevc (Main 10) ([36][0][0][0] / 0x0024), yuv420p10le(tv), 3840x2160 [SAR 1:1 DAR 16:9], 59.94 fps, 59.94 tbr, 90k  
 tbn, 59.94 tbc
    Stream #0:1[0x102](und): Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
[libx265 @ 0x3a53d40] Unknown option: profile.
x265 [info]: HEVC encoder version 2.2+35-fe2f2dd96f8c
x265 [info]: build info [Linux][GCC 5.4.1][64 bit] 10bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
x265 [info]: Main 10 profile, Level-5.1 (Main tier)
x265 [info]: Thread pool 0 using 64 threads on numa nodes 0,1,2,3
x265 [info]: Thread pool 1 using 64 threads on numa nodes 0,1,2,3
x265 [info]: Slices                              : 1
x265 [info]: frame threads / pool features       : 8 / wpp(68 rows)
x265 [info]: Coding QT: max CU size, min CU size : 32 / 16
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge         : dia / 57 / 0 / 2
x265 [info]: Keyframe min / max / scenecut / bias: 60 / 250 / 0 / 5.00
x265 [info]: Lookahead / bframes / badapt        : 5 / 3 / 0
x265 [info]: b-pyramid / weightp / weightb       : 1 / 0 / 0
x265 [info]: References / ref-limit  cu / depth  : 1 / off / off
x265 [info]: AQ: mode / str / qg-size / cu-tree  : 1 / 0.0 / 32 / 1
x265 [info]: Rate Control / qCompress            : CRF-19.0 / 0.60
x265 [info]: tools: rd=2 psy-rd=2.00 early-skip rskip tmvp fast-intra
x265 [info]: tools: strong-intra-smoothing lslices=8 deblock
Output #0, mp4, to 'Samsung_UF_3840x2160_CRF19.mp4':
  Metadata:
    encoder         : Lavf57.56.101
    Stream #0:0: Video: hevc (libx265) ([35][0][0][0] / 0x0023), yuv420p10le, 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 59.94 fps, 60k tbn, 59.94 tbc
    Metadata:
      encoder         : Lavc57.64.101 libx265
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> hevc (libx265))
Press [q] to stop, [?] for help
frame= 5581 fps= 20 q=-0.0 Lsize=  212585kB time=00:01:33.05
bitrate=18713.8kbits/s speed=0.336x
video:212514kB audio:0kB subtitle:0kB other streams:0kB global headers:2kB muxing overhead: 0.033184%
x265 [info]: frame I:     23, Avg QP:24.29  kb/s: 133747.47
x265 [info]: frame P:   1401, Avg QP:26.43  kb/s: 31994.19
x265 [info]: frame B:   4157, Avg QP:29.67  kb/s: 13602.20
x265 [info]: consecutive B-frames: 1.3% 1.4% 1.5% 95.9%
encoded 5581 frames in 276.59s (20.18 fps), 18714.28 kb/s, Avg QP:28.83 


  



  The encoding speed we get is 0.3x only. we are trying encode HEVC codec asset to HEVC codec itself with 4K resolution in 1x writing speed.

  



  Are we missing any parameters in ffmpeg command which can tweak encoding speed ?

  


• How to acheive 1x writing speed for 4K encoding in ffmpeg ?

  11 octobre 2017, par Anand92

  Is it possible to encode 4K asset in 1x writing speed ?

  Below are our encoding commands and details of CPU, source assets, and encoding command output :

  Encoding command

  ffmpeg -i 4K_Source.mp4 -c:v libx265 -preset ultrafast
  
      -x265-params fps=60:profile=main:min-keyint=60:crf=19 -vf "scale=3840:2160"
  
      -sc_threshold 0 4K_UF_3840x2160_CRF19.mp4

  Source Asset Details

  Overall bit rate mode      : Constant
  
  Overall bit rate           : 51.6 Mb/s
  
  Format                     : HEVC
  
  Format/Info                : High Efficiency Video Coding
  
  Format profile             : Main 10@L5.1@High
  
  Duration                   : 1 min 33 s
  
  Width                      : 3 840 pixels
  
  Height                     : 2 160 pixels
  
  Display aspect ratio       : 16:9
  
  Frame rate                 : 59.940 (60000/1001) FPS

  CPU details

  Intel(R) Xeon(R) CPU E7-8870 v3 @ 2.10GHz (144 core)

  FFMPEG command output

  ffmpeg version 3.2.4-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.1 (Debian 5.4.1-5) 20170205
  
    configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [mpegts @ 0x3a2b600] start time for stream 1 is not set in estimate_timings_from_pts
  
  [mpegts @ 0x3a2b600] Could not find codec parameters for stream 1 (Audio:  
  
  aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
  
  Consider increasing the value for the 'analyzeduration' and 'probesize'   
  
  options
  
  Input #0, mpegts, from 'Samsung_SUHD_Colorful_Food.mp4':
  
    Duration: 00:01:33.11, start: 1.050044, bitrate: 52076 kb/s
  
    Program 1
  
      Stream #0:0[0x101]: Video: hevc (Main 10) ([36][0][0][0] / 0x0024), yuv420p10le(tv), 3840x2160 [SAR 1:1 DAR 16:9], 59.94 fps, 59.94 tbr, 90k  
  
   tbn, 59.94 tbc
  
      Stream #0:1[0x102](und): Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
  
  [libx265 @ 0x3a53d40] Unknown option: profile.
  
  x265 [info]: HEVC encoder version 2.2ßfe2f2dd96f8c
  
  x265 [info]: build info [Linux][GCC 5.4.1][64 bit] 10bit
  
  x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
  
  x265 [info]: Main 10 profile, Level-5.1 (Main tier)
  
  x265 [info]: Thread pool 0 using 64 threads on numa nodes 0,1,2,3
  
  x265 [info]: Thread pool 1 using 64 threads on numa nodes 0,1,2,3
  
  x265 [info]: Slices                              : 1
  
  x265 [info]: frame threads / pool features       : 8 / wpp(68 rows)
  
  x265 [info]: Coding QT: max CU size, min CU size : 32 / 16
  
  x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
  
  x265 [info]: ME / range / subpel / merge         : dia / 57 / 0 / 2
  
  x265 [info]: Keyframe min / max / scenecut / bias: 60 / 250 / 0 / 5.00
  
  x265 [info]: Lookahead / bframes / badapt        : 5 / 3 / 0
  
  x265 [info]: b-pyramid / weightp / weightb       : 1 / 0 / 0
  
  x265 [info]: References / ref-limit  cu / depth  : 1 / off / off
  
  x265 [info]: AQ: mode / str / qg-size / cu-tree  : 1 / 0.0 / 32 / 1
  
  x265 [info]: Rate Control / qCompress            : CRF-19.0 / 0.60
  
  x265 [info]: tools: rd=2 psy-rd=2.00 early-skip rskip tmvp fast-intra
  
  x265 [info]: tools: strong-intra-smoothing lslices=8 deblock
  
  Output #0, mp4, to 'Samsung_UF_3840x2160_CRF19.mp4':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: hevc (libx265) ([35][0][0][0] / 0x0023), yuv420p10le, 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 59.94 fps, 60k tbn, 59.94 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 libx265
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (hevc (native) -> hevc (libx265))
  
  Press [q] to stop, [?] for help
  
  frame= 5581 fps= 20 q=-0.0 Lsize=  212585kB time=00:01:33.05
  
  bitrate=18713.8kbits/s speed=0.336x
  
  video:212514kB audio:0kB subtitle:0kB other streams:0kB global headers:2kB muxing overhead: 0.033184%
  
  x265 [info]: frame I:     23, Avg QP:24.29  kb/s: 133747.47
  
  x265 [info]: frame P:   1401, Avg QP:26.43  kb/s: 31994.19
  
  x265 [info]: frame B:   4157, Avg QP:29.67  kb/s: 13602.20
  
  x265 [info]: consecutive B-frames: 1.3% 1.4% 1.5% 95.9%
  
  encoded 5581 frames in 276.59s (20.18 fps), 18714.28 kb/s, Avg QP:28.83 

  The encoding speed we get is 0.3x only. we are trying encode HEVC codec asset to HEVC codec itself with 4K resolution in 1x writing speed.

  Are we missing any parameters in ffmpeg command which can tweak encoding speed ?