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• does ffmpeg allocate memory and will not release immediately when encoding and decoding?

  24 June 2021, by Tangtoo

  i want to transform videos to jpeg and wav as output. I wrote the programm by myself with FFmpeg-api. The video(.webm e.g.) is decoded and video and audio frames are encoded to jpeg and wav. With running of the program, more and more videos are converted but more and more rss are used(top cmd in linux).

  


  I have also used valgrind to test if there is memory leak. And there is None.

  


  The rss increases not linear and like follows(just example):

  


  1 video: 30m
2 video: 150m
3 video: 200m
4 video: 220m
5 video: 220m
6 video: 230m

  


  The programm run in docker container and k8s with memory limit(2G). After days(about 30000 videos are processed for example) the pod will be force restarted.

  


  Is it real memory leak? Or these memory are keeped by ffmpeg lib as memory pool or something?
Thanks

  


• Why does CreateDXGIFactory occupy GPU even if I call it's release interface

  13 May 2022, by TONY

  First I run the following code:

  


  IDXGIFactory* pFactory;
    HRESULT hr = CreateDXGIFactory(__uuidof(IDXGIFactory1), (void**)(&pFactory));
    if (FAILED(hr))
    {
        return -1;
    }


  


  then I tried to use ffmpeg's nvenc_h264 function:

  


      AVCodec* m_encoder = avcodec_find_encoder_by_name("h264_nvenc");
    if (!m_encoder) {
        m_encoder = avcodec_find_encoder_by_name("nvenc_h264");
    }

    if (!m_encoder) {
        err = -1;
        std::cout << "find 264 encoder failed" << std::endl;
        return 0;
    }

    AVCodecContext* m_encoder_ctx = avcodec_alloc_context3(m_encoder);
    if (!m_encoder_ctx) {

        err = -1;
        std::cout << "avcodec_alloc_context3 failed" << std::endl;
        return 0;
    }

    m_encoder_ctx->width = 1280;
    m_encoder_ctx->height = 720;
    m_encoder_ctx->time_base = { 1, (int)25 };

    m_encoder_ctx->codec_id = m_encoder->id;
    m_encoder_ctx->codec_type = AVMEDIA_TYPE_VIDEO;
    m_encoder_ctx->pix_fmt = AV_PIX_FMT_YUV420P;

    ret = avcodec_open2(m_encoder_ctx, m_encoder, nullptr);


  


  it's failed. the avcode_open2 would fail, it shows that
"[h264_nvenc @ 0000016AE3F06F00] dl_fn->cuda_dl->cuInit(0) failed -> CUDA_ERROR_NO_DEVICE: no CUDA-capable device is detected"
but if I don't call the CreateDXGIFactory, then the avcodec_open2 would success.

  


• Flutter app crashes in release mode when initializing FlutterFFmpegConfig();

  18 February 2021, by Mahmoud Eidarous

  The app is working on Android on Debug mode(only) with no errors in the logcat/terminal.
But when I tested it on iOS (even in debug mode), it crashes on a specific page.
After long tests, I could know that this line was causing the app to crash.

  


  FlutterFFmpegConfig _flutterFFmpegConfig = FlutterFFmpegConfig();


  


  If I comment that line, the app won't crash, but I need that line to manipulate videos in the app.

  


  I'm using flutter_ffmpeg: ^0.3.0 in pubspec.yaml, and full-gpl package is set in android\build.gradle

  


  ext {
    flutterFFmpegPackage  = "full-gpl"
}


  


  Related package initializations code snippet:

  


  final FlutterFFmpegConfig _flutterFFmpegConfig = new FlutterFFmpegConfig();
final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();
final FlutterFFprobe _flutterFFprobe = new FlutterFFprobe();


  


  I'm not sure, but it seems like the app can't handle creating all these objects at the same class!
Anyone familiar with this problem?