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• avcodec/bit_depth_template : Remove empty macro INIT_CLIP

  16 décembre 2024, par Zhao Zhili

  avcodec/bit_depth_template : Remove empty macro INIT_CLIP
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] libavcodec/bit_depth_template.c
  • [DH] libavcodec/h264pred_template.c
  • [DH] libavcodec/h264qpel_template.c
  • [DH] libavcodec/mips/h264qpel_mmi.c

• Empty audio backends for torchaudio list audio backends, with ffmpeg installed on system libraries [closed]

  28 mars, par Alberto Agudo Dominguez

  I installed torchaudio 2.5.1 and a system install of ffmpeg on Windows and get :

  


  PS C:\Users\> ffmpeg -version
ffmpeg version 2025-01-05-git-19c95ecbff-essentials_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
built with gcc 14.2.0 (Rev1, 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-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
libavutil      59. 54.101 / 59. 54.101
libavcodec     61. 31.100 / 61. 31.100
libavfilter    10.  6.101 / 10.  6.101
libswresample   5.  4.100 /  5.  4.100
libpostproc    58.  4.100 / 58.  4.100

PS C:\Users\> python
Python 3.12.5 (tags/v3.12.5:ff3bc82, Aug  6 2024, 20:45:27) [MSC v.1940 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import torchaudio
>>> torchaudio.list_audio_backends()
[]


  


  Hence ffmpeg is added to the path and recognized by the console, but not by torchaudio.

  


• Trying to get pixels from a transparent AVI file to use them in a Raylib image but AVFrame comes out empty

  27 novembre 2024, par Kolt Penny

  I was trying to open a video file with FFmpeg's API using C++. So far all the steps up until calling av_read_frame has no errors :

  


  

  • avformat_open_input, avformat_find_stream_info, avcodec_find_decoder, avcodec_alloc_context3 ,avcodec_parameters_to_context and avcodec_open2 pass the error checking.

  


  • AVFrame* av_frame and AVPacket* av_packet are correctly allocated.

  


  


  This following code is where I do the rest of the checks, to get the pixel data :

  


  int bufferSize = av_frame->width * av_frame->height * 4;
    unsigned char* data = new unsigned char[bufferSize];
    
    while (av_read_frame(av_format_ctx, av_packet) >= 0) {
        if (av_packet->stream_index == video_stream_idx) {
            if (avcodec_send_packet(av_codec_ctx, av_packet) == 0) {
                if (avcodec_receive_frame(av_codec_ctx, av_frame) == 0) {

                    memcpy(data, av_frame->data[0], bufferSize);

                    break; // We only need the first frame
                }
            }
        }
    }


  


  The issue is, up until ... if (avcodec_receive_frame(av_codec_ctx, av_frame) == 0) { ... and while inspecting the data, packet shows like this :
packet showing no data, but has size

  


  None of the function calls return any error so it should be working, yet the packet has no data, and consequently the frame comes out empty.

  


  Why could this be ? Should I keep looping on avcodec_send_packet(av_codec_ctx, av_packet) until it comes out not empty ?