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• How to send loading data before sending a file in Express Get Request

  2 octobre 2023, par TheHangel

  I have an express Node.js server.

  


  The objective of this server is make a process with ffmpeg and to send the file as result.

  


  I manage to know the percentage of the process. But I don't know how to make the client aware of the percentage before it sends the file.

  


  So here is my server-side code :
(I omitted some part of the ffmpeg process because, this is not very important, the important thing is to send the variable 'percent').

  


  const ffmpeg = require('fluent-ffmpeg');

app.get('/download', (req,res) => {
    const video = new ffmpeg('myaudio.mp3');
    let total;
    video
        .format('mp3')
        .on('codecData', (data) => {
            total = parseInt(data.duration.replace(/:/g, ''));
        })
        .on('progress', (progress) => {
            const time = parseInt(progress.timemark.replace(/:/g, ''));
            const percent = (time / total) * 100;
            console.log(percent); // I want to send 'percent' to the client instead of console.log
        })
        .on('end', () => {
            res.status(200).sendFile(output); // then it sends the file to client
        })
        .save(output);
});


  


  if you have a solution, can you show the client-side example, (axios or fetch) please ?

  


• FFmpeg, access violation on av_frame_free when running though Unity

  1er février 2021, par Mockarutan

  I'm working on a video recording plugin for Unity using ffmpeg. I'm new to the video encoding domain and just got my code to work today. But I think a might have a few memory leaks and trying to fix them crashes Unity.

  



  The plugin is written i c++ (as external "C" code) and imported in a c# script in unity with a simple DllImport. Again, this is not my comfort area either, but it works.

  



  When a screen buffer is rendered, I put in a RGB24 buffer and send it to my c++ function, this one :

  



  int encode_frame(uint8_t* rgb24Data)
{
    AVFrame *frame = av_frame_alloc();
    if (!frame)
        return COULD_NOT_ALLOCATE_FRAME;

    frame->format = codec_context->pix_fmt;
    frame->width = codec_context->width;
    frame->height = codec_context->height;

    int ret = av_image_alloc(frame->data, frame->linesize, codec_context->width, codec_context->height, codec_context->pix_fmt, 32);
    if (ret < 0)
        return COULD_NOT_ALLOCATE_PIC_BUF;

    SwsContext * ctx = sws_getContext(codec_context->width, codec_context->height,
        AV_PIX_FMT_RGB24, codec_context->width, codec_context->height,
        AV_PIX_FMT_YUV420P, 0, 0, 0, 0);


    uint8_t * inData[1] = { rgb24Data };
    int inLinesize[1] = { 3 * codec_context->width };

    sws_scale(ctx, inData, inLinesize, 0, codec_context->height, frame->data, frame->linesize); // From RGB to YUV

    frame->pts = frame_counter++;

    ret = avcodec_send_frame(codec_context, frame);
    if (ret < 0)
        return ERROR_ENCODING_FRAME_SEND;

    AVPacket pkt;
    av_init_packet(&pkt);
    pkt.data = NULL;
    pkt.size = 0;

    while (true)
    {
        ret = avcodec_receive_packet(codec_context, &pkt);
        if (!ret)
        {
            if (pkt.pts != AV_NOPTS_VALUE)
                pkt.pts = av_rescale_q(pkt.pts, codec_context->time_base, video_st->time_base);
            if (pkt.dts != AV_NOPTS_VALUE)
                pkt.dts = av_rescale_q(pkt.dts, codec_context->time_base, video_st->time_base);

            av_write_frame(outctx, &pkt);
            av_packet_unref(&pkt);
        }
        else if (ret == AVERROR(EAGAIN))
        {
            frame->pts = frame_counter++;
            ret = avcodec_send_frame(codec_context, frame);
            if (ret < 0)
                return ERROR_ENCODING_FRAME_SEND;
        }
        else if (ret < 0)
            return ERROR_ENCODING_FRAME_RECEIVE;
        else
            break;
    }

    // This one
    av_frame_free(&frame);
}


  



  Now, this code might have a lot of issues that I'm not aware of, and you are free to point them out if you like. But the line that gives me error is av_frame_free(&frame);.

  



  If I run this in a synthetic test app in c++ that I made, it works. I can even run it in a c# synthetic test app (exactly like the c++ one), and it works. But if I run it though Unity, it crashes on the first frame. The log says "Read from location fe7f8097 caused an access violation.".

  



  I have tried with av_freep() and av_free(). Not sure exactly what makes them different (different example codes use different ones), but none work.

  



  So, what I'm I missing ? The frame is leaking if I don't free it right ? But why does it crash in Unity ?

  



  The whole thing works great in Unity if I don't have the av_frame_free(&frame);. Resulting video looks great !

  



  PS. I'm aware (as far as I know) that the frame also leaks if something fails and returns an error code. But one thing at a time.

  


• FFmpeg, access violation on av_frame_free when running though Unity

  27 octobre 2016, par Mockarutan

  I’m working on a video recording plugin for Unity using ffmpeg. I’m new to the video encoding domain and just got my code to work today. But I think a might have a few memory leaks and trying to fix them crashes Unity.

  The plugin is written i c++ (as external "C" code) and imported in a c# script in unity with a simple DllImport. Again, this is not my comfort area either, but it works.

  When a screen buffer is rendered, I put in a RGB24 buffer and send it to my c++ function, this one :

  int encode_frame(uint8_t* rgb24Data)
  
  {
  
      AVFrame *frame = av_frame_alloc();
  
      if (!frame)
  
          return COULD_NOT_ALLOCATE_FRAME;
  
  
  
      frame->format = codec_context->pix_fmt;
  
      frame->width = codec_context->width;
  
      frame->height = codec_context->height;
  
  
  
      int ret = av_image_alloc(frame->data, frame->linesize, codec_context->width, codec_context->height, codec_context->pix_fmt, 32);
  
      if (ret < 0)
  
          return COULD_NOT_ALLOCATE_PIC_BUF;
  
  
  
      SwsContext * ctx = sws_getContext(codec_context->width, codec_context->height,
  
          AV_PIX_FMT_RGB24, codec_context->width, codec_context->height,
  
          AV_PIX_FMT_YUV420P, 0, 0, 0, 0);
  
  
  
  
  
      uint8_t * inData[1] = { rgb24Data };
  
      int inLinesize[1] = { 3 * codec_context->width };
  
  
  
      sws_scale(ctx, inData, inLinesize, 0, codec_context->height, frame->data, frame->linesize); // From RGB to YUV
  
  
  
      frame->pts = frame_counter++;
  
  
  
      ret = avcodec_send_frame(codec_context, frame);
  
      if (ret < 0)
  
          return ERROR_ENCODING_FRAME_SEND;
  
  
  
      AVPacket pkt;
  
      av_init_packet(&pkt);
  
      pkt.data = NULL;
  
      pkt.size = 0;
  
  
  
      while (true)
  
      {
  
          ret = avcodec_receive_packet(codec_context, &pkt);
  
          if (!ret)
  
          {
  
              if (pkt.pts != AV_NOPTS_VALUE)
  
                  pkt.pts = av_rescale_q(pkt.pts, codec_context->time_base, video_st->time_base);
  
              if (pkt.dts != AV_NOPTS_VALUE)
  
                  pkt.dts = av_rescale_q(pkt.dts, codec_context->time_base, video_st->time_base);
  
  
  
              av_write_frame(outctx, &pkt);
  
              av_packet_unref(&pkt);
  
          }
  
          else if (ret == AVERROR(EAGAIN))
  
          {
  
              frame->pts = frame_counter++;
  
              ret = avcodec_send_frame(codec_context, frame);
  
              if (ret < 0)
  
                  return ERROR_ENCODING_FRAME_SEND;
  
          }
  
          else if (ret < 0)
  
              return ERROR_ENCODING_FRAME_RECEIVE;
  
          else
  
              break;
  
      }
  
  
  
      // This one
  
      av_frame_free(&frame);
  
  }

  Now, this code might have a lot of issues that I’m not aware of, and you are free to point them out if you like. But the line that gives me error is av_frame_free(&frame);.

  If I run this in a synthetic test app in c++ that I made, it works. I can even run it in a c# synthetic test app (exactly like the c++ one), and it works. But if I run it though Unity, it crashes on the first frame. The log says "Read from location fe7f8097 caused an access violation.".

  I have tried with av_freep() and av_free(). Not sure exactly what makes them different (different example codes use different ones), but none work.

  So, what I’m I missing ? The frame is leaking if I don’t free it right ? But why does it crash in Unity ?

  The whole thing works great in Unity if I don’t have the av_frame_free(&frame);. Resulting video looks great !

  PS. I’m aware (as far as I know) that the frame also leaks if something fails and returns an error code. But one thing at a time.