Body: <blockquote>
  <p>environment：</p>
  <ol>
  <li>OS:Centos7</li>
  <li>FFMPEG version: 4.2</li>
  <li>GPU: NVIDIA Tesla T4</li>
  </ol>
  </blockquote>
  <p>I have a requirement to work with multiple FFMPEG instance,command like this:</p>
  <pre><code>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
  </code></pre>
  <p>and the output like this:</p>
  <pre><code>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 -&gt; #0:0 (h264 (h264_cuvid) -&gt; h264 (h264_nvenc))
    Stream #0:1 -&gt; #0:1 (aac (native) -&gt; 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
  </code></pre>
  <p>is very fast</p>
  <p>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:</p>
  <pre><code>Stream mapping:
    Stream #0:0 -&gt; #0:0 (h264 (h264_cuvid) -&gt; h264 (h264_nvenc))
    Stream #0:1 -&gt; #0:1 (aac (native) -&gt; aac (native))
  </code></pre>
  <p>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.</p>
  <p>I would like to ask what causes this problem? (Nvidia GPU limit or FFmpeg) .And any way to solve it.</p>
  <p>Thanks!</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-08-03T09:42:14.507Z
Comments.Text: You are not by any chance using google colab, right? It could be since they also use the T4 gpu, which is why I'm asking..
Comments.UserDisplayName: Florian Claaßen
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-08-03T10:19:49.337Z
Comments.Text: This command is run on my pc
Comments.UserDisplayName: tor br
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-08-03T14:28:31.040Z
Comments.Text: Hmm alright, thank you for clarifying. In that case I am afraid I cannot help
Comments.UserDisplayName: Florian Claaßen
Tags: <ffmpeg><nvidia>
Title: FFmpeg start slowly with multiple instance on nvidia T4 GPU
UserDisplayName: tor br
ThreadText: # FFmpeg start slowly with multiple instance on nvidia T4 GPU
  
  (Asked by: username_0 on 2020-08-03)
  
  > environment：
  >
  > 1. OS:Centos7
  > 2. FFMPEG version: 4.2
  > 3. GPU: NVIDIA Tesla T4
  
  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!
  
  **Tags:** ffmpeg, nvidia
  
  > **Comments:**
  > **username_1**: You are not by any chance using google colab, right? It could be since they also use the T4 gpu, which is why I'm asking..  
  > **username_0**: This command is run on my pc  
  > **username_1**: Hmm alright, thank you for clarifying. In that case I am afraid I cannot help  
  
  ---
  
  ## 0 answers
  
  