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• How can I solve the error when installing ffmpeg [closed]

  11 mars 2024, par zhiyang hou

  OS :
uname -r
3.10.0-957.27.2.el7.x86_64

  


  I performed the following steps on CentOS :

  


  1.Installed dependency libraries :

  


  sudo yum install epel-release -y
sudo yum install autoconf automake cmake freetype-devel gcc gcc-c++ git libtool make      mercurial nasm pkgconfig zlib-devel -y


  


  2.Cloned the FFmpeg repository :

  


  git clone https://git.ffmpeg.org/ffmpeg.git


  


  3.Compiled and installed FFmpeg :

  


  cd ffmpeg
./configure --enable-shared
make -j$(nproc)
sudo make install


  


  Then, I encountered the following issue :

  


  (123) [root@b0a30580415d ffmpeg]# make install
INSTALL libavdevice/libavdevice.a
X86ASM  libavcodec/x86/vvc/vvc_mc.o
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:55: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:56: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:57: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
libavcodec/x86/vvc/vvc_mc.asm:58: error: operand 1: expression is not simple or relocatable
make: *** [libavcodec/x86/vvc/vvc_mc.o] Error 1


  


  I am trying to find relevant information on the ffmpeg official website, but I don't know how to solve it. I hope to get guidance from someone with strong technical skills. Thank you.

  


• Right way to use vmaf with ffmpeg

  14 juin, par dravit

  I am trying to calculate the VMAF score of a processed video wrt the original file.

  


  Command I have used :

  


  ffmpeg -y -loglevel info -stats -i original.mp4 -i processed.mp4 -lavfi "[0]null[refdeint];[refdeint]scale=1920:1080:flags=neighbor[ref];[1]setpts=PTS+0.0/TB[b];[b]scale=1920:1080:flags=neighbor[c];[c][ref]libvmaf=log_fmt=json:phone_model=1:model_path={model_path_here}/vmaf_v0.6.1.json:n_subsample=1:log_path=log.json" -f null -


  


  Now as per the official documentation of vmaf with ffmpeg found here, it says source/reference file followed by the encoded/distorted/processed file.

  


  But almost all of the blogs I came across, they are using the other way round order of the args, i.e. processed file followed by the original file.

  


  Few examples :

  


  


  1. https://medium.com/@eyevinntechnology/keep-an-eye-on-the-video-quality-b9bcb58dd5a1 : search for "Using VMAF within FFMPEG" in it.

     


  


  2. https://websites.fraunhofer.de/video-dev/calculating-vmaf-and-psnr-with-ffmpeg/ : search for "Metric Calculation with FFmpeg" in it.

     


  


  


  EDIT

  


  NOTE : Changing the order does change the VMAF score.

  


• FFmpeg decode OGG Vorbis audio as float, how to get float data from decoder

  19 novembre 2020, par cs guy

  I am trying to decode a OGG Vorbis audio file with the following :

  


  // if opening input failed
    if (avformat_open_input(&pFormatContext, filePath.c_str(), av_find_input_format("ogg"),
                            nullptr) != 0) {
        
        LOGE("FFmpegExtractor can not open the file! %s", filePath.c_str());
        return FAILED_TO_LOAD;
    }

    durationInMillis = pFormatContext->duration / AV_TIME_BASE * secondsToMilli;
    LOGD("FFmpegExtractor opened the file, Duration: %llu", durationInMillis);

    avformat_find_stream_info(pFormatContext, nullptr);

    LOGD("pFormatContext streams num: %ui", pFormatContext->nb_streams);

    int sendPacketResult = 0;
    int receiveFrameResult = 0;

    for (int i = 0; i < pFormatContext->nb_streams; i++) {
        AVCodecParameters *pLocalCodecParameters = pFormatContext->streams[i]->codecpar;

        if (pLocalCodecParameters->codec_type == AVMEDIA_TYPE_AUDIO) {
            avCodecContext = avcodec_alloc_context3(avCodec);
            if (!avCodecContext) {
                
                LOGE("FFmpegExtractor avcodec_alloc_context3 failed!");
                return FAILED_TO_LOAD;
            }

            if (avcodec_parameters_to_context(avCodecContext, pLocalCodecParameters) < 0) {
                
                LOGE("FFmpegExtractor avcodec_parameters_to_context failed!");
                return FAILED_TO_LOAD;
            }

            if (avcodec_open2(avCodecContext, avCodec, nullptr) < 0) {
                
                LOGE("FFmpegExtractor avcodec_open2 failed!");
                return FAILED_TO_LOAD;
            }
        }

        while (av_read_frame(pFormatContext, avPacket) >= 0) {
            
            sendPacketResult = avcodec_send_packet(avCodecContext, avPacket);

            
            receiveFrameResult = avcodec_receive_frame(avCodecContext, avFrame);

            // TODO: Get frames PCM data from the decoder, 
        }
    }


  


  I am stuck on the last part. I want to get the decoded data of the current frame as a float between -1 to +1 for all the channels the audio has but I have no idea how to. I looked at the official documents but I could not understand them. How can I get the data from the decoder on the line

  


  


  // TODO : Get frames PCM data from the decoder,