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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:

    enter image description here

    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
    

    enter image description here

    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:

    enter image description here

    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?