FFmpeg 内存泄漏

Question

我开发了一个简单的库，修改了我在互联网上找到的库。

让我害怕的是，当我播放 avi 时，它会在视频结束时播放并释放内存，但是当我播放视频时，就像内存泄漏一样！尽管视频已结束并且 FreeAll 方法（删除上下文的函数等）已被调用，但它仍增长到 138mb。

这是导致内存泄漏的方法的代码：

int VideoGL::NextVideoFrame(){
int frameDone = 0;
int result = 0;
double pts = 0;

if(!this->ended){

if (!_started) return 0;
AVPacket* packet;

// Get the number of milliseconds passed and see if we should display a new frame
int64_t msPassed = (1000 * (clock() - _baseTime)) / CLOCKS_PER_SEC;
if (msPassed >= _currentPts)
{
    // If this is not the current frame, copy it to the buffer
    if (_currentFramePts != _currentPts){
        _currentFramePts = _currentPts;
        memcpy(buffer_a,buffer, 3 * _codec_context_video->width * _codec_context_video->height);
        result = 1;
    }

    // Try to load a new frame from the video packet queue
    bool goodop=false;
    AVFrame *_n_frame = avcodec_alloc_frame();
    while (!frameDone && (packet = this->DEQUEUE(VIDEO)) != NULL)
    {
        if (packet == (AVPacket*)-1) return -1;

        goodop=true;

        _s_pts = packet->pts;
        avcodec_decode_video2(_codec_context_video, _n_frame, &frameDone, packet);
        av_free_packet(packet);

        if (packet->dts == AV_NOPTS_VALUE)
        {
            if (_n_frame->opaque && *(uint64_t*)_n_frame->opaque != AV_NOPTS_VALUE) pts = (double) *(uint64_t*)_n_frame->opaque;
            else pts = 0;
        }
        else pts = (double) packet->dts;

        pts *= av_q2d(_codec_context_video->time_base);

    }

    if (frameDone)
    {
        // if a frame was loaded scale it to the current texture frame buffer, but also set the pts so that it won't be copied to the texture until it's time
        sws_scale(sws_ctx,_n_frame->data, _n_frame->linesize, 0, _codec_context_video->height, _rgb_frame->data, _rgb_frame->linesize);


        double nts = 1.0/av_q2d(_codec_context_video->time_base);
        _currentPts = (uint64_t) (pts*nts);

    }

    avcodec_free_frame(&_n_frame);
    av_free(_n_frame);

    if(!goodop){
        ended=true;
    }
}
}

return result;
}

我会等待答案，谢谢。

Answer 1

我也有同样的问题。根据 ffplay.c 你应该打电话

av_frame_unref(pFrame);
avcodec_get_frame_defaults(pFrame);

每次sw_scale通话后。这将在解码期间释放所有 malloc。