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  • How to use ffmpeg on a stream input to extract frames

    21 juillet 2023, par Deepak Sharma

    I have tried piping the stream to a ffmpeg process for extracting the frames. It does process the small files and able to extract the frames successfully but for most of the files it throws error. The reference of the code I have used from this link- https://mathewsachin.github.io/blog/2017/07/28/ffmpeg-pipe-csharp.html
When I am running the below code

    


    `

    


        public static void RunFfmpeg()
    {
        
        //-framerate 20 -f rawvideo -pix_fmt rgb32 -video_size 1920x1080
        var inputArgs = "-i -";
        var outputArgs = "-ss 00:00 -t 20 -vf fps=5  $filename%03d.bmp";

        var process = new Process
        {
            StartInfo =
            {
                FileName = "ffmpeg",
                Arguments = $"{inputArgs} {outputArgs}",
                UseShellExecute = false,
                //CreateNoWindow = true,
                RedirectStandardInput = true,
                RedirectStandardOutput = true,
                WorkingDirectory = @"d:\ffmpegout"
            }
        };

        process.Start();

        var ffmpegIn = process.StandardInput.BaseStream;

        using (Stream contents = File.OpenRead("C:\\Desktop\\Videos\\B.mp4"))
        {
            contents.CopyTo(ffmpegIn);
        }

        // After you are done
        ffmpegIn.Flush();
        ffmpegIn.Close();

        // Make sure ffmpeg has finished the work
        process.WaitForExit();
    }`


    


    I am getting the below error

    


    ffmpeg version 2023-07-16-git-c541ecf0dc-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
configuration : —enable-gpl —enable-version3 —enable-static —disable-w32threads —disable-autodetect —enable-fontconfig —enable-iconv —enable-gnutls —enable-libxml2 —enable-gmp —enable-bzlib —enable-lzma —enable-libsnappy —enable-zlib —enable-librist —enable-libsrt —enable-libssh —enable-libzmq —enable-avisynth —enable-libbluray —enable-libcaca —enable-sdl2 —enable-libaribb24 —enable-libaribcaption —enable-libdav1d —enable-libdavs2 —enable-libuavs3d —enable-libzvbi —enable-librav1e —enable-libsvtav1 —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs2 —enable-libxvid —enable-libaom —enable-libjxl —enable-libopenjpeg —enable-libvpx —enable-mediafoundation —enable-libass —enable-frei0r —enable-libfreetype —enable-libfribidi —enable-libharfbuzz —enable-liblensfun —enable-libvidstab —enable-libvmaf —enable-libzimg —enable-amf —enable-cuda-llvm —enable-cuvid —enable-ffnvcodec —enable-nvdec —enable-nvenc —enable-d3d11va —enable-dxva2 —enable-libvpl —enable-libshaderc —enable-vulkan —enable-libplacebo —enable-opencl —enable-libcdio —enable-libgme —enable-libmodplug —enable-libopenmpt —enable-libopencore-amrwb —enable-libmp3lame —enable-libshine —enable-libtheora —enable-libtwolame —enable-libvo-amrwbenc —enable-libcodec2 —enable-libilbc —enable-libgsm —enable-libopencore-amrnb —enable-libopus —enable-libspeex —enable-libvorbis —enable-ladspa —enable-libbs2b —enable-libflite —enable-libmysofa —enable-librubberband —enable-libsoxr —enable-chromaprint
libavutil 58. 14.100 / 58. 14.100
libavcodec 60. 22.100 / 60. 22.100
libavformat 60. 10.100 / 60. 10.100
libavdevice 60. 2.101 / 60. 2.101
libavfilter 9. 8.102 / 9. 8.102
libswscale 7. 3.100 / 7. 3.100
libswresample 4. 11.100 / 4. 11.100
libpostproc 57. 2.100 / 57. 2.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000266a80179c0] Could not find codec parameters for stream 0 (Video : h264 (avc1 / 0x31637661), none(tv, bt709), 1280x720, 4023 kb/s) : unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'fd :' :
Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2avc1mp41
encoder : Lavf58.76.100
Duration : 00:00:21.22, start : 0.000000, bitrate : N/A
Stream #0:00x1 : Video : h264 (avc1 / 0x31637661), none(tv, bt709), 1280x720, 4023 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 30k tbn (default)
Metadata :
handler_name : VideoHandler
vendor_id : [0][0][0][0]
Stream mapping :
Stream #0:0 -> #0:0 (h264 (native) -> bmp (native))
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000266a80179c0] stream 0, offset 0xbb3a : partial file
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished
Conversion failed !

    


    I did check the metadata of the video is present in the start of the file before the mdat box.

    


    Looking to get some help to resolve this issue.

    


  • configure : don't disable '-ftree-vectorize' on GCC >= 13 on major architectures

    14 juillet, par Jiawei
    configure : don't disable '-ftree-vectorize' on GCC >= 13 on major architectures

    This changes configure to stop disabling -ftree-vectorize on
    
GCC versions 13 and newer, on major architectures.
    

    Background :

    - Original `-fno-tree-vectorize` was added in 2009 in commit
    
  973859f5230e to avoid compiler errors.

    - Re-enabled in 2016 in commit cb8646af24bd but caused failures due
    
  to inline CABAC assembly issues and was disabled again in
    
  fd6dbc53855fb.

    - Commit 182663a58a7a in 2023 fixed the inline CABAC assembly issues.

    - Recent versions of GCC, in particular 13 and newer, seem to
    
  generally work reliably with respect to vectorization, although bugs
    
  have been observed on Loongarch.
    

    Cautiously allow the GCC default of having vectorization enabled,
    
on major architectures where we expect to see enough testing. If
    
further issues are observed, they should be reported and noted here in
    
configure, so the workarounds can be scoped and version limited.
    • [DH] Changelog
    • [DH] configure

  • avutil : remove deprecated FF_API_HDR_VIVID_THREE_SPLINE

    19 février, par James Almer
    avutil : remove deprecated FF_API_HDR_VIVID_THREE_SPLINE

    Deprecated since 2023-03-17.
    

    Signed-off-by : James Almer <jamrial@gmail.com>
    • [DH] libavcodec/dynamic_hdr_vivid.c
    • [DH] libavutil/hdr_dynamic_vivid_metadata.h
    • [DH] libavutil/version.h

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