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• How save an audio buffer with Fluent FFmpeg

  17 juin 2016, par Luke

  I have a Buffer object that contains audio data and I'm wondering if I can save this Buffer through Fluent FFmpeg without writing it to a file temporary first.

  I came across this other question: fluent-ffmpeg module: "end" event does not fire

  Which seems to do what I need but with video, however, this technique doesn't seem to work for me. I get the following error:

  ffmpeg write error 'Input stream error: not implemented'
  

  How can I pipe a Buffer directly to Fluent FFmpeg without writing it to a temporary file first?

• 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
  

• Use Ffmpeg on android with linux commands

  17 juin 2016, par soheila

  I'm new programmer for android. I want to use ffmpeg with android.

  But my question is can I use ffpmeg on android programming with Linux commands? for example use this ffmpeg code :

  ffmpeg -framerate 1/5 -i img%03d.png -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4
  

  on android programming??

• libx265 motion compensation and CU traverse

  17 juin 2016, par Ariana

  I'm trying to play with the H.265 motion compensation and search (HEVC- libx265 implementation from here: https://bitbucket.org/multicoreware/x265/downloads). I need to slightly extend the edge extension search, and fill the macro block with left-most pixels as if my sample videos are like cylinder (rightmost is connected to leftmost).

  What I need to do is basically this:

  

  One way to do that is to modify the edge extension area (which is already in the code, in the frameFilter.cpp), and do that for rightmost and fill parts of blocks which are out with leftmost pixels. I identified the piece of code here which apparently is responsible for that. Can someone help me with implementing this feature?

  if ((col == 0) | (col == m_frameFilter->m_numCols - 1))
      {
          // TODO: improve by process on Left or Right only
          primitives.extendRowBorder(reconPic->getLumaAddr(m_rowAddr), stride, reconPic->m_picWidth, realH, reconPic->m_lumaMarginX);
  
          if (m_frameFilter->m_param->internalCsp != X265_CSP_I400)
          {
              primitives.extendRowBorder(reconPic->getCbAddr(m_rowAddr), strideC, reconPic->m_picWidth >> hChromaShift, realH >> vChromaShift, reconPic->m_chromaMarginX);
              primitives.extendRowBorder(reconPic->getCrAddr(m_rowAddr), strideC, reconPic->m_picWidth >> hChromaShift, realH >> vChromaShift, reconPic->m_chromaMarginX);
          }
      }
  
      // Extra Left and Right border on first and last CU
      if ((col == 0) | (col == m_frameFilter->m_numCols - 1))
      {
          copySizeY += lumaMarginX;
          copySizeC += chromaMarginX;
      }
  
      // First column need extension left padding area and first CU
      if (col == 0)
      {
          pixY -= lumaMarginX;
          pixU -= chromaMarginX;
          pixV -= chromaMarginX;
      }
  

• Push multiple videos after each other

  16 juin 2016, par hansa testa

  i'm trying to understand to do something simple, but i'm not able to find out example or understand how to do that. Let say i have 10 videos inside my folder:

  01.mp4
  02.mp4
  03.mp4
  04.mp4
  05.mp4
  06.mp4
  07.mp4
  08.mp4
  09.mp4
  10.mp4
  

  is it possible to push the video as rtmp to my server where it push first video 01.mp4 and when video 01.mp4 is done it start doing same with video 02.mp4 etc..?

  if yes can you please show me how so i can learn doing that?