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• FFmpeg Hardware Acceleration with NVENC produces Half Green output video

  17 juin 2016, par Dan Sandland

  Using the FFmpeg build found here : https://github.com/illuspas/ffmpeg-hw-win32

  gcc 5.3.0
  
  --enable-nvenc nvidia_video_sdk_6.0.1
  
  --enable-libmfx Intel(R)_Media_SDK_2016.0.1
  
  --enable-libfdk-aac 0.1.4
  
  --enable-libspeex 1.2rc1
  
  --enable-libx264 1:148.20150725
  
  --enable-libopenh264 1.5.0
  
  --enable-libx265 1.8
  
  --enable-libopus 1.1.2
  
  --enable-libmp3lame 3.99.5
  
  --enable-libkvazaar 0.8.2

  ./configure —prefix=/home/aliang/FFmpeg/x86_64 —enable-small —disable-debug —disable-doc —arch=x86_64 —cc=’ccache x86_64-w64-mingw32-gcc’ —cross-prefix=x86_64-w64-mingw32- —enable-cross-compile —target-os=mingw32 —enable-libfdk-aac —enable-libmp3lame —enable-libopus —enable-libspeex —enable-libx264 —enable-libx265 —enable-libmfx —enable-nvenc —enable-libopenh264 —enable-libkvazaar —enable-gpl —enable-nonfree

  I’m running Windows on a MacBook Pro. I also tried with a more recent build and had the same output.

  Input video is from sample-videos.com.

  The ffmpeg command I am running is :

  ffmpeg -y -i sample.mp4 -vcodec nvenc_h264 -pixel_format yuv420p -f mp4 sample-out-nvenc.mp4

  sample-out-nvenc.mp4 looks like this via ffplay or vlc :

  

  When I grab a frame using jpeg2, the colors appear normal, but the height is squished.

  ffmpeg -y -ss 15.5 -i sample.mp4 -vframes 1 -s 480x300 -f image2 grab.jpg

  

  The ffprobe results for the output (sample-out-nvenc.mp4) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sample-out-nvenc.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.25.100
  
    Duration: 00:00:31.02, start: 0.021333, bitrate: 1994 kb/s
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p(tv), 640x480 [SAR 1:1 DAR 4:3], 1650 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 342 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  Lastly the output from the nvenc encoding command :

  ffmpeg -y -i sample.mp4 -vcodec nvenc_h264 -pixel_format yuv420p -f mp4 sample-out-nvenc.mp4
  
  ffmpeg version 3.0 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.0 (GCC)
  
    configuration: --prefix=/home/aliang/FFmpeg/x86_64 --enable-small --disable-debug --disable-doc --arch=x86_64 --cc='ccache x86_64-w64-mingw32-gcc' --cross-prefix=x86_64-w64-mingw32- --enable-cross-compile --target-os=mingw32 --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libspeex --enable-libx264 --enable-libx265 --enable-libmfx --enable-nvenc --enable-libopenh264 --enable-libkvazaar --enable-gpl --enable-nonfree
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sample.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.24.2
  
    Duration: 00:00:31.00, start: 0.000000, bitrate: 1353 kb/s
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 966 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : SoundHandler
  
  Output #0, mp4, to 'sample-out-nvenc.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.25.100
  
      Stream #0:0(und): Video: h264 (nvenc_h264) ([33][0][0][0] / 0x0021), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 2000 kb/s, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.24.102 nvenc_h264
  
      Side data:
  
        unknown side data type 10 (24 bytes)
  
      Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, 5.1, fltp, 341 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : SoundHandler
  
        encoder         : Lavc57.24.102 aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (nvenc_h264))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=  774 fps=253 q=-0.0 Lsize=    7551kB time=00:00:30.99 bitrate=1995.6kbits/s speed=10.1x
  
  video:6236kB audio:1297kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.243011%
  
  [aac @ 000001cdd9900520] Qavg: 743.457

• Fastest way to combine an image and audio file to make a video using ffmpeg

  10 septembre 2020, par Ritik Sahu Student

  i am using ffmpeg to combine an image and audio to make video with this command from my python program

  


  process = subprocess.Popen('ffmpeg -loop 1 -i "{picture}" -i "{audio}" -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest "{out_path}"'.format(picture=picture, audio=audio, out_path=out_path), stdout=subprocess.PIPE, shell=False)


  


  but it is taking very long almost 30-45 minutes on my pc with specifications 1GB Ram and intel xenon processor. is there any way to make this process faster
i am ready to compromise the quality (decent).

  


• dnn/openvino : add log error message

  27 août 2020, par Ting Fu

  dnn/openvino : add log error message
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  

  • [DH] libavfilter/dnn/dnn_backend_openvino.c