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Autres articles (46)

MediaSPIP v0.2

21 juin 2013, par kent1

MediaSPIP 0.2 est la première version de MediaSPIP stable.
Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)
Mise à disposition des fichiers

14 avril 2011, par kent1

Par défaut, lors de son initialisation, MediaSPIP ne permet pas aux visiteurs de télécharger les fichiers qu’ils soient originaux ou le résultat de leur transformation ou encodage. Il permet uniquement de les visualiser.
Cependant, il est possible et facile d’autoriser les visiteurs à avoir accès à ces documents et ce sous différentes formes.
Tout cela se passe dans la page de configuration du squelette. Il vous faut aller dans l’espace d’administration du canal, et choisir dans la navigation (...)
MediaSPIP version 0.1 Beta

16 avril 2011, par kent1

MediaSPIP 0.1 beta est la première version de MediaSPIP décrétée comme "utilisable".
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Pour avoir une installation fonctionnelle, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ... | 16

Sur d’autres sites (7033)

Saving immediately each converted image to video file

5 juillet 2020, par Adam Lasota
I want to ask about solution to streaming many of image to video. I traied use ffmpeg java, Jcodec, Humble-Video but this api providing static convert. Is means that gets all images, process it and save to file.




For example (pseudocode) :



```
JCodec jcodec= new Jcoced(file.mp4);//could be ffmpgRecorder &#xA;for(image:images)&#xA;{&#xA;jcodec.record(image);&#xA;}&#xA;&#xA;jcodec.stop()&#xA;jcodec.release()&#xA;
```



If execute jcodec.stop() then to file is flushed converted images. Is possible to saving file image by image and stream to file ? Images for application are providing by client socket.




Expected solution (pseudocode) :



```
JCodec jcodec= new Jcoced(file.mp4);&#xA;for(image:images)&#xA;{&#xA;jcodec.record(image);&#xA;jcodec.flush();&#xA;jcodec.save();&#xA;}&#xA;&#xA;
```



or :



```
FileOutputStream file= new FileOutputStream(fff.mp4, append:true)&#xA;for(image:images)&#xA;{&#xA;frame f=convertImageToFrame(iamge)&#xA;byte[] b= f.toByte();&#xA;file.write(b);&#xA;}&#xA;file.close()&#xA;
```

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 &amp;&amp; !_video->finished())

    {

        boost::mutex::scoped_lock lock(_mutex);



        if(!_video->get_next_packet(&amp;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(&amp;packet);

        }



        StreamDecoder* strm_dc = decoder_it->second;



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

    {

        if(packet.stream_index == vi_first)

        {

            AVFrame* f = decoder.decode_packet(&amp;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() &amp;&amp; i &lt; 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.

Can you "stream" images to ffmpeg to construct a video, instead of saving them to disk ?

22 juin 2022, par Brandon
My work recently involves programmatically making videos. In python, the typical workflow looks something like this :




```
import subprocess, Image, ImageDraw&#xA;&#xA;for i in range(frames_per_second * video_duration_seconds):&#xA;    img = createFrame(i)&#xA;    img.save("%07d.png" % i)&#xA;&#xA;subprocess.call(["ffmpeg","-y","-r",str(frames_per_second),"-i", "%07d.png","-vcodec","mpeg4", "-qscale","5", "-r", str(frames_per_second), "video.avi"])&#xA;
```




This workflow creates an image for each frame in the video and saves it to disk. After all images have been saved, ffmpeg is called to construct a video from all of the images.





Saving the images to disk (not the creation of the images in memory) consumes the majority of the cycles here, and does not appear to be necessary. Is there some way to perform the same function, but without saving the images to disk ? So, ffmpeg would be called and the images would be constructed and fed to ffmpeg immediately after being constructed.

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Can you "stream" images to ffmpeg to construct a video, instead of saving them to disk ?

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