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  • FFmpeg start slowly with multiple instance on nvidia T4 GPU

    3 août 2020, par wyWang
    


    environment：

    


      

    1. OS:Centos7

      2. 


    2. FFMPEG version : 4.2

      3. 


    3. GPU : NVIDIA Tesla T4

      4. 


    


    


    I have a requirement to work with multiple FFMPEG instance,command like this :

    


    ffmpeg -y -loglevel info -hwaccel cuvid -hwaccel_output_format cuda -c:v h264_cuvid \
    -i http://xx/xxxx.mp4 \
    -c:v  h264_nvenc  -ss 0 -t 600 out.mp4


    


    and the output like this :

    


    ffmpeg version 4.2.git Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39)
  configuration: --enable-cuda-nvcc --enable-cuda --enable-cuvid --enable-nvenc --enable-libnpp --prefix=/snbeauty//platform/centos --pkg-config-flags=--static --extra-cflags='-I/snbeauty//platform/centos/include -I/usr/local/cuda/include/ -Werror=implicit-function-declaration -std=gnu99' --extra-ldflags='-L/snbeauty//platform/centos/lib64 -L/snbeauty//platform/centos/lib -L/usr/local/lib64 -L/usr/lib64 -L/usr/local/cuda/lib64 -L/lib64' --extra-libs='-lpthread -lm -lEGL -lGL -lpng -lYNEffect -ltracker -lcuda -lcudart' --bindir=/snbeauty//platform/centos/bin --enable-static --enable-nonfree --enable-libfreetype --enable-libfribidi --enable-libfontconfig --enable-filters --enable-version3 --enable-gpl --enable-libass --enable-libfdk_aac --enable-encoder=libfdk_aac --enable-opengl --enable-filter=xiu --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libtheora --enable-libwebp --enable-frei0r --enable-openssl --enable-gray --enable-libxml2 --enable-libxvid
  libavutil      56. 42.100 / 56. 42.100
  libavcodec     58. 73.102 / 58. 73.102
  libavformat    58. 39.101 / 58. 39.101
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 77.100 /  7. 77.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://xxx/xxxx.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:38:52.05, start: 0.000000, bitrate: 5370 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080, 5245 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 119 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (h264_cuvid) -> h264 (h264_nvenc))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'out.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.39.101
    Stream #0:0(und): Video: h264 (h264_nvenc) (Main) (avc1 / 0x31637661), cuda, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 2000 kb/s, 25 fps, 12800 tbn, 25 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc58.73.102 h264_nvenc
    Side data:
      cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000 vbv_delay: N/A
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      encoder         : Lavc58.73.102 aac
frame=15000 fps=336 q=26.0 Lsize=  152462kB time=00:10:00.00 bitrate=2081.6kbits/s speed=13.4x    
video:142668kB audio:9418kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.247139%
[aac @ 0x32437c0] Qavg: 168.657

real    0m45.568s
user    0m29.034s
sys 0m2.961s


    


    is very fast

    


    But when I try concurrent 10 processes to run this command with different input url,ffmpeg start is very slowly. Then I found FFmpeg is slowly in this step :

    


    Stream mapping:
  Stream #0:0 -> #0:0 (h264 (h264_cuvid) -> h264 (h264_nvenc))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))


    


    When the video is very short(like 0.5s or 1s), FFmpeg takes a long time to start.The actual codec takes less time than the boot time.

    


    I would like to ask what causes this problem ? (Nvidia GPU limit or FFmpeg) .And any way to solve it.

    


    Thanks !

    


  • FFMPEG(C++) - Iam getting this error while accessing webcam [closed]

    31 juillet 2020, par Vetagiri Hrushikesh

    2020-08-01 00:31:56.099431+0530 Video_Encoder[30853:426264] [] CMIOHardware.cpp:917:CMIODeviceStopStream the System is exiting
2020-08-01 00:31:56.099508+0530 Video_Encoder[30853:426264] [] CMIOHardware.cpp:1332:CMIOStreamCopyBufferQueue the System is exiting
2020-08-01 00:31:56.124804+0530 Video_Encoder[30853:426264] [] CMIOHardware.cpp:333:CMIOObjectGetPropertyData the System is exiting
2020-08-01 00:31:56.124880+0530 Video_Encoder[30853:426264] [] CMIO_DALA_System.cpp:264:GetPropertyData error 1970171760 (unop) getting property selector (inot) scope (glob) element 0
2020-08-01 00:31:56.125011+0530 Video_Encoder[30853:426264] [] CMIOHardware.cpp:333:CMIOObjectGetPropertyData the System is exiting
2020-08-01 00:31:56.125055+0530 Video_Encoder[30853:426264] [] CMIO_DALA_System.cpp:264:GetPropertyData error 1970171760 (unop) getting property selector (inot) scope (glob) element 0
Program ended with exit code : 1

    


    Thanks in Advance

  • FFMPEG cannot find H264 encoder

    31 juillet 2020, par Serban Stoenescu

    I am running ffmpeg from a program, and we built ffmpeg ourselves (we did not install it with package managers or pre-built stuff).
This is the command that is built :

    


    2020-07-31 12:14:11.942 INFO ffmpeg::FFTranscoder Executing: "../deps/ffmpeg/bin/ffmpeg" -y -r 26.062 -i ""/home/sstoenescu/Work/myproject/sample/myvideo.h264"" -c:v openh264 -vcodec h264 -movflags +faststart ""/home/sstoenescu/Work/myproject/sample/myvideo.mp4""


    


    The file myvideo.h264 is valid, I can play it with ffplay and I can run ffprobe on it without problems.
However, the command above gives this error :

    


    ffmpeg version N-98068-g16bdc2b541 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --arch=x86_64 --cpu=nehalem --disable-ffplay --enable-shared --enable-network --enable-gpl --enable-libx265 --enable-encoder=libx265 --disable-hwaccels --enable-hwaccel=h264_qsv --enable-hwaccel=h264_vaapi
  libavutil      56. 50.100 / 56. 50.100
  libavcodec     58. 90.100 / 58. 90.100
  libavformat    58. 44.100 / 58. 44.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 84.100 /  7. 84.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
[h264 @ 0x5597c38defc0] error while decoding MB 86 45, bytestream -30
[h264 @ 0x5597c38defc0] concealing 2723 DC, 2723 AC, 2723 MV errors in I frame
Input #0, h264, from '/home/sstoenescu/Work/edvr/laba/gaoazar.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1200k tbn, 50 tbc
Multiple -c, -codec, -acodec, -vcodec, -scodec or -dcodec options specified for stream 0, only the last option '-c:v h264' will be used.
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_v4l2m2m))
Press [q] to stop, [?] for help
[h264 @ 0x5597c38e30c0] error while decoding MB 86 45, bytestream -30
[h264 @ 0x5597c38e30c0] concealing 2723 DC, 2723 AC, 2723 MV errors in I frame
[h264_v4l2m2m @ 0x5597c3905500] Could not find a valid device
[h264_v4l2m2m @ 0x5597c3905500] can't configure encoder
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


    


    It used to work, I did not change anything in the command, so I'm assuming it's something in the way we build ffmpeg. We are using these flags : --enable-decoder=h264 --enable-encoder=h264_qsv    --enable-encoder=h264_vaapi --enable-decoder=h264 --enable-decoder=h264_qsv
Here's the full configuration :

    


    ./configure \
    --arch=x86_64 --cpu=nehalem \
    --disable-ffplay --enable-shared \
    --enable-network \
    --enable-gpl --enable-libx265 \
    --enable-encoder=libx265\
    --disable-hwaccels --enable-hwaccel=h264_qsv --enable-hwaccel=h264_vaapi \
     #--enable-encoder=libopenh264 \
     --enable-encoder=h264_qsv \
        --enable-encoder=h264_vaapi --enable-encoder=mjpeg --enable-encoder=gif \
    --enable-decoder=h264 --enable-decoder=h264_qsv \
        #--enable-decoder=libopenh264 
    --enable-libx264 \
        --enable-decoder=png \
    --enable-protocol=tcp \
    --enable-demuxer=rtsp --enable-demuxer=mov --enable-demuxer=h264 --enable-demuxer=image2 \
    --enable-muxer=mp4 --enable-muxer=h264 --enable-muxer=image2 \
    --prefix="./build"\
    --disable-doc


    


    Any ideas what could be wrong ?
Thanks.

    


    Regards,
Serban

    


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