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• Picking the right gpu for ffmpeg decoding/encoding with nvidia/cuda

  14 avril 2020, par Reza Mir

  I am writing code using ffmpeg/nvidia/cuda library to decode and encode some video. I am trying to pick one specific GPU for decoding/encoding among some existing GPUs installed on the system. Here is the list of existing GPUs :

  



   nvidia-smi 
Tue Apr 14 00:14:59 2020       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 440.64.00    Driver Version: 440.64.00    CUDA Version: 10.2     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce RTX 208...  On   | 00000000:1A:00.0 Off |                  N/A |
| 41%   33C    P8    20W / 260W |      0MiB / 11019MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
|   1  GeForce GTX 108...  On   | 00000000:1B:00.0 Off |                  N/A |
| 41%   65C    P2   182W / 250W |   7167MiB / 11178MiB |     53%      Default |
+-------------------------------+----------------------+----------------------+
|   2  GeForce GTX 108...  On   | 00000000:1E:00.0 Off |                  N/A |
| 14%   55C    P2    61W / 250W |   1943MiB / 11178MiB |     26%      Default |
+-------------------------------+----------------------+----------------------+
|   3  Quadro P5000        On   | 00000000:3D:00.0 Off |                  Off |
| 26%   33C    P8     6W / 180W |      1MiB / 16278MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
|   4  TITAN RTX           On   | 00000000:3E:00.0 Off |                  N/A |
| 41%   38C    P0    72W / 280W |      0MiB / 24220MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
|   5  TITAN RTX           On   | 00000000:41:00.0 Off |                  N/A |
| 40%   32C    P8    14W / 280W |      0MiB / 24220MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+



  



  I would like to pick GPU #3 in my code and use it for decoding. I am using h264_nvenc and h264_cuvid as encoder and decoder in my program and setting the options of decoder/encoder using the following code :

  



  av_opt_set(decoder_context->priv_data, "gpu", "Quadro P5000", 0);


  



  But this code doesn't pick Quadro GPU for decoding/encoding. Instead, it always goes to GPU #4 in my test :

  



  nvidia-smi pmon | grep tx
    4      20096     C    22     3    44    16   tx            
    4      20096     C    26     4    49    17   tx            
    4      20096     C    25     4    49    17   tx     


  


• why FFMPEG process is slow ?

  4 septembre 2020, par puneet18

  I tried to process 4gb video using ffmpeg on server with 1 CPU & 2GB RAM but the command is hanged for 5 mins then starts and process very slowly. Following is the console output :

  


  Command

  


  ffmpeg -i input.mp4 -filter_complex '[0:v]trim=823.2:867.3,setpts=PTS-STARTPTS[v0];[0:v]trim=1074.1:1101.4,setpts=PTS-STARTPTS[v1];[0:v]trim=1142.2:1198.9,setpts=PTS-STARTPTS[v2];[0:v]trim=1227.9:1320.0,setpts=PTS-STARTPTS[v3];[0:v]trim=1887.1:1990.8,setpts=PTS-STARTPTS[v4];[0:v]trim=2008.1:2091.3,setpts=PTS-STARTPTS[v5];[0:v]trim=3090.1:3105.1,setpts=PTS-STARTPTS[v6];[0:v]trim=3185.3:3222.2,setpts=PTS-STARTPTS[v7];[0:v]trim=3306.4:3336.5,setpts=PTS-STARTPTS[v8];[0:v]trim=3426.7:3465.7,setpts=PTS-STARTPTS[v9];[0:v]trim=3548.7:3586.5,setpts=PTS-STARTPTS[v10];[v0][v1][v2][v3][v4][v5][v6][v7][v8][v9][v10]concat=n=11:v=1[out]' -map '[out]' output.mp4


  


  Output

  


  ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/down-net_http20200902-1614-1x7tk8f.mp4':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : 2020-08-28T14:02:14.000000Z
  Duration: 01:00:18.73, start: 0.000000, bitrate: 8895 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 8871 kb/s, 15 fps, 15 tbr, 6k tbn, 12k tbc (default)
    Metadata:
      creation_time   : 2020-08-28T14:02:14.000000Z
      handler_name    : Core Media Video
Stream mapping:
  Stream #0:0 (h264) -> trim
  Stream #0:0 (h264) -> trim
  Stream #0:0 (h264) -> trim
  Stream #0:0 (h264) -> trim
  Stream #0:0 (h264) -> trim
  Stream #0:0 (h264) -> trim
  Stream #0:0 (h264) -> trim
  Stream #0:0 (h264) -> trim
  Stream #0:0 (h264) -> trim
  Stream #0:0 (h264) -> trim
  Stream #0:0 (h264) -> trim
  concat -> Stream #0:0 (libx264)
Press [q] to stop, [?] for help
[libx264 @ 0x563bd0d2c520] using SAR=1/1
[libx264 @ 0x563bd0d2c520] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x563bd0d2c520] profile High, level 3.1
[libx264 @ 0x563bd0d2c520] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=15 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '/opt/app/tmp/file_1599089716.mp4':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 15 fps, 15360 tbn, 15 tbc (default)
    Metadata:
      encoder         : Lavc57.107.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x 




  


  How can I improve the speed ?

  


  ==================

  


  I tried following command and getting an error :

  


  Command

  


  ffmpeg -ss 823.2 -to 867.3 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -ss 1074.1 -to 1101.4 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -ss 1142.2 -to 1198.9 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -ss 1227.9 -to 1320.0 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -ss 1887.1 -to 1990.8 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -ss 2008.1 -to 2091.3 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -ss 3090.1 -to 3105.1 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -ss 3185.3 -to 3222.2 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -ss 3306.4 -to 3336.5 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -ss 3426.7 -to 3465.7 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -ss 3548.7 -to 3586.5 -i /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4  -filter_complex '[0:v][1:v][2:v][3:v][4:v][5:v][6:v][7:v][8:v][9:v][10:v]concat=n=11:v=1:a=0[v]' -map '[v]' /opt/app/tmp/file_1599127170.mp4


  


  Error

  


  Option to (record or transcode stop time) cannot be applied to input url /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4 -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to.
Error parsing options for input file /opt/app/tmp/down-net_http20200903-4776-1o4wkhk.mp4.
Error opening input files: Invalid argument


  


• How to : stream with ffmpeg and nginx rtmp, Ubuntu

  3 décembre 2020, par WurmD

  nginx installed with https://nginx.org/en/linux_packages.html in Ubuntu 18.04

  


  sudo apt -y install curl gnupg2 ca-certificates lsb-release ;
echo "deb http://nginx.org/packages/ubuntu `lsb_release -cs` nginx" | sudo tee /etc/apt/sources.list.d/nginx.list ;
curl -fsSL https://nginx.org/keys/nginx_signing.key | sudo apt-key add - ;
sudo apt update ;
sudo apt install nginx ;


  


  nginx up and running

  


  $ ps -aux | grep nginx
root      5602  0.0  0.0  33348   880 ?        Ss   17:03   0:00 nginx: master process nginx
nginx     5603  0.0  0.0  33744  2748 ?        S    17:03   0:00 nginx: worker process


  


  with /etc/nginx/nginx.conf

  


  rtmp {
    server {
        listen 1935;
        chunk_size 4096;

        application live {
            live on;
            record off;
            allow publish 127.0.0.1;
            deny publish all;
        }
    }
}


  


  ffmpeg -f lavfi -i testsrc -t 30 -pix_fmt yuv420p -f flv rtmp://localhost/live/test yields

  


  ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, lavfi, from 'testsrc':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
[tcp @ 0x5611668b8c00] Connection to tcp://localhost:1935 failed: Connection refused
[rtmp @ 0x5611668b8520] Cannot open connection tcp://localhost:1935
rtmp://localhost/live: Connection refused


  


  Clue :
Nothing seems to be listening on port 1935. netstat -tap | grep 1935 yields nothing
Clue2 :
Albeit ps shows app as running, systemctl status nginx.service shows app status down

  


  ● nginx.service - nginx - high performance web server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2020-12-03 19:37:17 CET; 7min ago
     Docs: http://nginx.org/en/docs/
  Process: 5709 ExecStart=/usr/sbin/nginx -c /etc/nginx/nginx.conf (code=exited, status=1/FAILURE)


  


  Things checked given other stackoverflow questions :

  


  

  • trying to connect to rtmp://localhost/live/test and in nginx.conf the application is correctly named live

  


  • nginx.conf correctly placed at /etc/nginx/, no other nginx.conf files exist, and nginx -s reload called to make sure it is loaded

  


  • no localhost instances in the conf file, all renamed to 127.0.0.1