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  • 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 2.2fe2f2dd96f8c
    
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 ?

  • Using ffmpeg to obtain video durations in python

    14 mars 2017, par OSK

    I’ve installed ffprobe using the pip ffprobe command on my PC, and installed ffmpeg from here.

    However, I’m still having trouble running the code listed here.

    I try to use the following code unsuccessfully.

    SyntaxError : Non-ASCII character ’\xe2’ in file GetVideoDurations.py
    on line 12, but no encoding declared ; see
    http://python.org/dev/peps/pep-0263/ for details

    Does anyone know what’s wrong ? Am I not referencing the directories correctly ? Do I need to make sure the .py and video files are in a specific location ?

    import subprocess
    

    
def getLength(filename):
    
  result = subprocess.Popen(["ffprobe", "filename"],
    
    stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
    
  return [x for x in result.stdout.readlines() if "Duration" in x]
    

    
fileToWorkWith = ‪'C:\Users\PC\Desktop\Video.mkv'
    

    
getLength(fileToWorkWith)

    Apologies if the question is somewhat basic. All I need is to be able to iterate over a group of video files and get their start time and end time.

    Thank you !

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