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  • Loss of frame order when saving AVFrames in a threaded environment

    10 juin 2015, par Orphid

    Context : I’m using ffmpeg’s api to extract frames from video files for test purposes. I’ve had a lot of issues getting it to work, and several re-writes. This time I’ve added tests at every stage to make sure I can isolate where errors are occurring.

    Problem : I want to have a producer-consumer relationship set-up - a FrameProcessor class has a thread which pushes decoded frames into a queue, which a test client consumes. After adding this in, I suddenly found that my frames were being saved out of order, but I can’t see why this is happening because everything should be locked, and there’s only one producer and one consumer. Here is a section of code that adds frames to the queue :

    void FrameProcessor::_do_processing()
    
{
    
    AVPacket packet;
    

    
    _is_processing = true;
    

    
    Logger::Info("Starting to buffer frames on a separate thread.");
    

    
    while(!_stop_processing_requested && !_video->finished())
    
    {
    
        boost::mutex::scoped_lock lock(_mutex);
    

    
        if(!_video->get_next_packet(&packet))
    
        {
    
            Logger::Info("The video ran out of frames, so FrameProcessor producer thread has stopped.");
    
            lock.unlock();
    
            break;
    
        }
    

    
        Logger::Info("FrameProcessor producer thread reads a packet from the stream (pts = " + std::to_string(packet.pts) + ").");
    

    
        int indx = packet.stream_index;
    

    
        auto decoder_it = _decoder_map.find(indx);
    

    
        if(decoder_it == _decoder_map.end())
    
        {
    
            Logger::Debug("FrameProcessor discarded a packet from stream index " + std::to_string(indx) + " because the stream was not enabled in the FrameProcessor.");
    
            av_free_packet(&packet);
    
        }
    

    
        StreamDecoder* strm_dc = decoder_it->second;
    

    
        AVFrame* frm = strm_dc->decode_packet(&packet);
    

    
        if(frm != NULL)
    
        {
    
            Logger::Debug("Producer thread pushed a frame into the FrameProcessor queue (pts = " + std::to_string(frm->pts) + ", coded num = " + std::to_string(frm->coded_picture_number) + ").");
    
            _frames.push(new TestFrame(frm));
    
            _print_queue();
    
        }
    

    
        av_free_packet(&packet);
    

    
        lock.unlock();
    

    
        _wait_for_buffer_space();
    

    
    }
    

    
    Logger::Info("Finished buffering. Buffer stop requested? " + std::to_string(_stop_processing_requested));
    

    
    _is_processing = false;
    
}

    The dequeue section of a test before adding producer thread :

    while(v->get_next_packet(&packet))
    
    {
    
        if(packet.stream_index == vi_first)
    
        {
    
            AVFrame* f = decoder.decode_packet(&packet);
    

    
            if(f != NULL)
    
            {
    
                TestFrame* tf = new TestFrame(f);
    

    
                Logger::Info("|MAIN| Dequeued frame with pts " + std::to_string(tf->av_frame->pts) + " and coded num " + std::to_string(tf->av_frame->coded_picture_number) + ".");
    

    
                int cdc_num = tf->av_frame->coded_picture_number;
    

    
                TestFrame* tf1 = formatter.format(*tf);
    

    
                Logger::Debug("|MAIN| Saving frame with coded id " + std::to_string(cdc_num) + " as frame" + std::to_string(i) + ".ppm");
    

    
                save_ppm_frame(tf1->av_frame, v1_ctx->width, v1_ctx->height, "tst3", i++);
    

    
                delete tf1;
    
            }
    
            if(i > 40)
    
                break;
    
        }
    
    }

    And the dequeue section of one of my tests after adding producer thread / FrameProcessor class :

    while(!v->finished() && i < 40)
    
{
    
    tf = processor->next_frame();
    

    
    if(tf == NULL)
    
        continue;
    

    
    Logger::Info("|MAIN| Dequeued frame with pts " + std::to_string(tf->av_frame->pts) + " and coded num " + std::to_string(tf->av_frame->coded_picture_number) + ".");
    

    
    //formatting the frame somehow seems to cause the coded_picture_number to be zeroed, so get it now.
    
    int cdc_num = tf->av_frame->coded_picture_number;
    

    
    TestFrame* tf1 = formatter->format(*tf);
    

    
    Logger::Debug("|MAIN| Saving frame with coded id " + std::to_string(cdc_num) + " as frame" + std::to_string(i) + ".ppm");
    

    
    save_ppm_frame(tf1->av_frame, width, height, "tst4", i++);
    

    
    delete tf1;
    
}

    The only two threads that should be in use are the main program thread, and the producer thread. The really odd thing is that I can see from my logs that all the coded ids are coming out in the correct order, but when I check the actual ppm files, the images are clearly not (hopefully you can see the dot in these images jumping backwards and forwards, when it should be moving in a smooth curve) :

    frame26
    frame27
    frame28
    frame29

    To be clear, before adding the threading in, these frames were coming out correctly. Here’s an example of the logging information from two runs, one without threading, and one with (please be aware that coded_picture_number is not the same as display order - I’m just using the values to check that they match the successful earlier run.) I greped the logs to just show the consumer side of the logging :

    Before adding producer thread & frame queue :

    [2015-Jun-10 11:01:44.783523]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 0.
    
[2015-Jun-10 11:01:44.783859]: <debug> |MAIN| Saving frame with coded id 0 as frame0.ppm
    
[2015-Jun-10 11:01:44.784811]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 2.
    
[2015-Jun-10 11:01:44.784982]: <debug> |MAIN| Saving frame with coded id 2 as frame1.ppm
    
[2015-Jun-10 11:01:44.785910]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 3.
    
[2015-Jun-10 11:01:44.786075]: <debug> |MAIN| Saving frame with coded id 3 as frame2.ppm
    
[2015-Jun-10 11:01:44.786896]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 1.
    
[2015-Jun-10 11:01:44.787060]: <debug> |MAIN| Saving frame with coded id 1 as frame3.ppm
    
[2015-Jun-10 11:01:44.787967]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 5.
    
[2015-Jun-10 11:01:44.788145]: <debug> |MAIN| Saving frame with coded id 5 as frame4.ppm
    
[2015-Jun-10 11:01:44.789004]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 6.
    
[2015-Jun-10 11:01:44.789173]: <debug> |MAIN| Saving frame with coded id 6 as frame5.ppm
    
[2015-Jun-10 11:01:44.789946]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 4.
    
[2015-Jun-10 11:01:44.790124]: <debug> |MAIN| Saving frame with coded id 4 as frame6.ppm
    
[2015-Jun-10 11:01:44.790909]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 8.
    
[2015-Jun-10 11:01:44.791075]: <debug> |MAIN| Saving frame with coded id 8 as frame7.ppm
    
[2015-Jun-10 11:01:44.791895]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 9.
    
[2015-Jun-10 11:01:44.792060]: <debug> |MAIN| Saving frame with coded id 9 as frame8.ppm
    
[2015-Jun-10 11:01:44.793512]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 7.
    
[2015-Jun-10 11:01:44.793704]: <debug> |MAIN| Saving frame with coded id 7 as frame9.ppm
    
[2015-Jun-10 11:01:44.794566]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 11.
    
[2015-Jun-10 11:01:44.794733]: <debug> |MAIN| Saving frame with coded id 11 as frame10.ppm
    
[2015-Jun-10 11:01:44.795638]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 12.
    
[2015-Jun-10 11:01:44.795802]: <debug> |MAIN| Saving frame with coded id 12 as frame11.ppm
    
[2015-Jun-10 11:01:44.796633]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 10.
    
[2015-Jun-10 11:01:44.796797]: <debug> |MAIN| Saving frame with coded id 10 as frame12.ppm
    
[2015-Jun-10 11:01:44.797594]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 14.
    
[2015-Jun-10 11:01:44.797759]: <debug> |MAIN| Saving frame with coded id 14 as frame13.ppm
    
[2015-Jun-10 11:01:44.798524]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 15.
    
[2015-Jun-10 11:01:44.798666]: <debug> |MAIN| Saving frame with coded id 15 as frame14.ppm
    
[2015-Jun-10 11:01:44.799332]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 13.
    
[2015-Jun-10 11:01:44.799470]: <debug> |MAIN| Saving frame with coded id 13 as frame15.ppm
    
[2015-Jun-10 11:01:44.800176]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 17.
    
[2015-Jun-10 11:01:44.800312]: <debug> |MAIN| Saving frame with coded id 17 as frame16.ppm
    
[2015-Jun-10 11:01:44.801048]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 18.
    
[2015-Jun-10 11:01:44.801186]: <debug> |MAIN| Saving frame with coded id 18 as frame17.ppm
    
[2015-Jun-10 11:01:44.801842]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 16.
    
[2015-Jun-10 11:01:44.801977]: <debug> |MAIN| Saving frame with coded id 16 as frame18.ppm
    
[2015-Jun-10 11:01:44.802629]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 20.
    
[2015-Jun-10 11:01:44.802766]: <debug> |MAIN| Saving frame with coded id 20 as frame19.ppm
    
[2015-Jun-10 11:01:44.803427]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 21.
    
[2015-Jun-10 11:01:44.803564]: <debug> |MAIN| Saving frame with coded id 21 as frame20.ppm
    
[2015-Jun-10 11:01:44.804289]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 19.
    
[2015-Jun-10 11:01:44.804429]: <debug> |MAIN| Saving frame with coded id 19 as frame21.ppm
    
[2015-Jun-10 11:01:44.805131]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 23.
    
[2015-Jun-10 11:01:44.805266]: <debug> |MAIN| Saving frame with coded id 23 as frame22.ppm
    
[2015-Jun-10 11:01:44.805987]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 24.
    
[2015-Jun-10 11:01:44.806132]: <debug> |MAIN| Saving frame with coded id 24 as frame23.ppm
    
[2015-Jun-10 11:01:44.806792]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 22.
    
[2015-Jun-10 11:01:44.806929]: <debug> |MAIN| Saving frame with coded id 22 as frame24.ppm
    
[2015-Jun-10 11:01:44.807604]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 26.
    
[2015-Jun-10 11:01:44.807742]: <debug> |MAIN| Saving frame with coded id 26 as frame25.ppm
    
[2015-Jun-10 11:01:44.808411]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 27.
    
[2015-Jun-10 11:01:44.808550]: <debug> |MAIN| Saving frame with coded id 27 as frame26.ppm
    
[2015-Jun-10 11:01:44.809201]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 25.
    
[2015-Jun-10 11:01:44.809339]: <debug> |MAIN| Saving frame with coded id 25 as frame27.ppm
    
[2015-Jun-10 11:01:44.810079]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 29.
    
[2015-Jun-10 11:01:44.810243]: <debug> |MAIN| Saving frame with coded id 29 as frame28.ppm
    
[2015-Jun-10 11:01:44.810887]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 30.
    
[2015-Jun-10 11:01:44.811001]: <debug> |MAIN| Saving frame with coded id 30 as frame29.ppm
    
[2015-Jun-10 11:01:44.811672]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 28.
    
[2015-Jun-10 11:01:44.811785]: <debug> |MAIN| Saving frame with coded id 28 as frame30.ppm
    
[2015-Jun-10 11:01:44.812450]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 32.
    
[2015-Jun-10 11:01:44.812565]: <debug> |MAIN| Saving frame with coded id 32 as frame31.ppm
    
[2015-Jun-10 11:01:44.813262]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 33.
    
[2015-Jun-10 11:01:44.813380]: <debug> |MAIN| Saving frame with coded id 33 as frame32.ppm
    
[2015-Jun-10 11:01:44.813964]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 31.
    
[2015-Jun-10 11:01:44.814076]: <debug> |MAIN| Saving frame with coded id 31 as frame33.ppm
    
[2015-Jun-10 11:01:44.814664]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 35.
    
[2015-Jun-10 11:01:44.814778]: <debug> |MAIN| Saving frame with coded id 35 as frame34.ppm
    
[2015-Jun-10 11:01:44.815375]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 36.
    
[2015-Jun-10 11:01:44.815489]: <debug> |MAIN| Saving frame with coded id 36 as frame35.ppm
    
</debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info>

    After adding producer thread & frame queue :

    [2015-Jun-10 11:01:44.827119]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 0.
    
[2015-Jun-10 11:01:44.827459]: <debug> |MAIN| Saving frame with coded id 0 as frame0.ppm
    
[2015-Jun-10 11:01:44.829389]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 2.
    
[2015-Jun-10 11:01:44.829751]: <debug> |MAIN| Saving frame with coded id 2 as frame1.ppm
    
[2015-Jun-10 11:01:44.831429]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 3.
    
[2015-Jun-10 11:01:44.831758]: <debug> |MAIN| Saving frame with coded id 3 as frame2.ppm
    
[2015-Jun-10 11:01:44.833583]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 1.
    
[2015-Jun-10 11:01:44.833906]: <debug> |MAIN| Saving frame with coded id 1 as frame3.ppm
    
[2015-Jun-10 11:01:44.834585]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 5.
    
[2015-Jun-10 11:01:44.834691]: <debug> |MAIN| Saving frame with coded id 5 as frame4.ppm
    
[2015-Jun-10 11:01:44.835167]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 6.
    
[2015-Jun-10 11:01:44.835273]: <debug> |MAIN| Saving frame with coded id 6 as frame5.ppm
    
[2015-Jun-10 11:01:44.835753]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 4.
    
[2015-Jun-10 11:01:44.835857]: <debug> |MAIN| Saving frame with coded id 4 as frame6.ppm
    
[2015-Jun-10 11:01:44.836336]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 8.
    
[2015-Jun-10 11:01:44.836440]: <debug> |MAIN| Saving frame with coded id 8 as frame7.ppm
    
[2015-Jun-10 11:01:44.836897]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 9.
    
[2015-Jun-10 11:01:44.837002]: <debug> |MAIN| Saving frame with coded id 9 as frame8.ppm
    
[2015-Jun-10 11:01:44.837460]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 7.
    
[2015-Jun-10 11:01:44.837565]: <debug> |MAIN| Saving frame with coded id 7 as frame9.ppm
    
[2015-Jun-10 11:01:44.838080]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 11.
    
[2015-Jun-10 11:01:44.838200]: <debug> |MAIN| Saving frame with coded id 11 as frame10.ppm
    
[2015-Jun-10 11:01:44.838666]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 12.
    
[2015-Jun-10 11:01:44.838772]: <debug> |MAIN| Saving frame with coded id 12 as frame11.ppm
    
[2015-Jun-10 11:01:44.839322]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 10.
    
[2015-Jun-10 11:01:44.839428]: <debug> |MAIN| Saving frame with coded id 10 as frame12.ppm
    
[2015-Jun-10 11:01:44.839910]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 14.
    
[2015-Jun-10 11:01:44.840018]: <debug> |MAIN| Saving frame with coded id 14 as frame13.ppm
    
[2015-Jun-10 11:01:44.867898]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 15.
    
[2015-Jun-10 11:01:44.868013]: <debug> |MAIN| Saving frame with coded id 15 as frame14.ppm
    
[2015-Jun-10 11:01:44.868925]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 13.
    
[2015-Jun-10 11:01:44.869039]: <debug> |MAIN| Saving frame with coded id 13 as frame15.ppm
    
[2015-Jun-10 11:01:44.869938]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 17.
    
[2015-Jun-10 11:01:44.870051]: <debug> |MAIN| Saving frame with coded id 17 as frame16.ppm
    
[2015-Jun-10 11:01:44.871000]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 18.
    
[2015-Jun-10 11:01:44.871154]: <debug> |MAIN| Saving frame with coded id 18 as frame17.ppm
    
[2015-Jun-10 11:01:44.871792]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 16.
    
[2015-Jun-10 11:01:44.871907]: <debug> |MAIN| Saving frame with coded id 16 as frame18.ppm
    
[2015-Jun-10 11:01:44.872873]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 20.
    
[2015-Jun-10 11:01:44.872993]: <debug> |MAIN| Saving frame with coded id 20 as frame19.ppm
    
[2015-Jun-10 11:01:44.873606]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 21.
    
[2015-Jun-10 11:01:44.873719]: <debug> |MAIN| Saving frame with coded id 21 as frame20.ppm
    
[2015-Jun-10 11:01:44.874324]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 19.
    
[2015-Jun-10 11:01:44.874432]: <debug> |MAIN| Saving frame with coded id 19 as frame21.ppm
    
[2015-Jun-10 11:01:44.874931]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 23.
    
[2015-Jun-10 11:01:44.875046]: <debug> |MAIN| Saving frame with coded id 23 as frame22.ppm
    
[2015-Jun-10 11:01:44.875507]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 24.
    
[2015-Jun-10 11:01:44.875620]: <debug> |MAIN| Saving frame with coded id 24 as frame23.ppm
    
[2015-Jun-10 11:01:44.876087]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 22.
    
[2015-Jun-10 11:01:44.876190]: <debug> |MAIN| Saving frame with coded id 22 as frame24.ppm
    
[2015-Jun-10 11:01:44.876654]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 26.
    
[2015-Jun-10 11:01:44.876757]: <debug> |MAIN| Saving frame with coded id 26 as frame25.ppm
    
[2015-Jun-10 11:01:44.877242]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 27.
    
[2015-Jun-10 11:01:44.877345]: <debug> |MAIN| Saving frame with coded id 27 as frame26.ppm
    
[2015-Jun-10 11:01:44.877816]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 25.
    
[2015-Jun-10 11:01:44.877919]: <debug> |MAIN| Saving frame with coded id 25 as frame27.ppm
    
[2015-Jun-10 11:01:44.878453]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 29.
    
[2015-Jun-10 11:01:44.878558]: <debug> |MAIN| Saving frame with coded id 29 as frame28.ppm
    
[2015-Jun-10 11:01:44.879066]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 30.
    
[2015-Jun-10 11:01:44.879187]: <debug> |MAIN| Saving frame with coded id 30 as frame29.ppm
    
[2015-Jun-10 11:01:44.879676]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 28.
    
[2015-Jun-10 11:01:44.879790]: <debug> |MAIN| Saving frame with coded id 28 as frame30.ppm
    
[2015-Jun-10 11:01:44.908448]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 32.
    
[2015-Jun-10 11:01:44.908569]: <debug> |MAIN| Saving frame with coded id 32 as frame31.ppm
    
[2015-Jun-10 11:01:44.909642]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 33.
    
[2015-Jun-10 11:01:44.909756]: <debug> |MAIN| Saving frame with coded id 33 as frame32.ppm
    
[2015-Jun-10 11:01:44.910879]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 31.
    
[2015-Jun-10 11:01:44.910992]: <debug> |MAIN| Saving frame with coded id 31 as frame33.ppm
    
[2015-Jun-10 11:01:44.911988]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 35.
    
[2015-Jun-10 11:01:44.912147]: <debug> |MAIN| Saving frame with coded id 35 as frame34.ppm
    
[2015-Jun-10 11:01:44.913108]: <info> |MAIN| Dequeued frame with pts -9223372036854775808 and coded num 36.
    
[2015-Jun-10 11:01:44.913222]: <debug> |MAIN| Saving frame with coded id 36 as frame35.ppm
    
</debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info></debug></info>

    And, basically, I can’t see the difference between what’s being logged between the two tests - they are both saving the frames with the same coded_picture_numbers in the same order as far as I can see, but the images are different. If you select one frame from both runs (say frame28.ppm), you can see that the frames at the same index are just not the same images. I’m still very new to C++, so apologies if this is just a trivial general error.

    EDIT :

    I’ve used a work around to solve this - by removing the whole producer-consumer model and having the FrameProducer simply decode the next frame when requested. This isn’t really an answer to what’s going wrong here, but I understand that it’s difficult for members to help with something for which it’s just impractical to give sufficient code to reproduce.

  • msrle : Use FFABS to determine the frame size in msrle_decode_pal4

    25 mai 2015, par Luca Barbato
    msrle : Use FFABS to determine the frame size in msrle_decode_pal4

    As done in msrle_decode_8_16_24_32.
    

    Bug-Id : CVE-2015-3395
    
CC : libav-stable@libav.org
    • [DH] libavcodec/msrledec.c

  • h264 : Make sure reinit failures mark the context as not initialized

    25 mai 2015, par Luca Barbato
    h264 : Make sure reinit failures mark the context as not initialized

    Bug-Id : CVE-2015-3417
    
CC : libav-stable@libav.org
    • [DH] libavcodec/h264_slice.c

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