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• How do I save `RTSP` streams as `*.mp4` files in Golang ? [closed]

  14 septembre 2021, par Clancy Zeng

  I need to use Golang to save the data from the RTSP stream to a *.mp4 video file for a specified length of time.

  


  I wanted to install an FFmpeg application and then call a command like this from Golang to solve my needs.

  


  


  ffmpeg -i rtsp ://192.168.108.132:8554/profile0 -r 16 -tt 60 /tmp/test.mp4

  


  


  But installing FFMPEG takes up hundreds of megabytes of space.So this idea was rejected by the leadership.

  


  Is there a pure Golang implementation library that can address my needs ?Or is there a golang-only library that parses RTSP streams and saves them as *.MP4 video files ?

  


• Trying to save frames as colored image using Ffmpeg in C++

  2 septembre 2021, par Tolga

  I am new to FFmpeg and I am trying to save the video frames as colored images. I have achieved saving them as grayscale using Netpbm, however, I need to save the frames as colored. I have tried implementing the code in this link.

  


  However, I get an error :

  


  'Exception thrown at 0x00E1FC4F (swscale-5.dll) in VideoDecoding2.exe:
 0xC0000005: Access violation writing location 0xCCCCCCCC.'


  


  Is there any way to improve this code or another way to save frames as colored ?

  


  Here is my code below.

  


  

  • src_pix_fmt is AV_PIX_FMT_YUV420p.

  


  • dst_pix_fmt is AV_PIX_FMT_RGB24.

  


  


  src_pix_fmt = avcc->pix_fmt;

src_width = avcc->width;
src_height = avcc->height;

dst_width = src_width;
dst_height = src_height;

numBytes = av_image_get_buffer_size(dst_pix_fmt, dst_width, dst_height, 0);

buffer = (uint8_t*)av_malloc(numBytes);

if ((ret = av_image_alloc(src_data, src_linesize, src_width, src_height, src_pix_fmt, 16)) < 0)
{
    printf("Couldn't allocate source image.\n");
    return 0;
}

av_image_fill_arrays(frameRGB->data, frameRGB->linesize, buffer, dst_pix_fmt, dst_width, dst_height, 0);

while (av_read_frame(avfc, packet) >= 0)
{
    ret = avcodec_send_packet(avcc, packet);
    if (ret < 0)
    {
        printf("Packets could not supplied to decoder.\n");
        return -1;
    }

    ret = avcodec_receive_frame(avcc, frame);
    printf("%d", ret);

    if (packet->stream_index == videoStream)
    {
        sws_ctx = sws_getContext(src_width, src_height, src_pix_fmt,
            dst_width, dst_height, dst_pix_fmt,
            SWS_BILINEAR, NULL, NULL, NULL);

        if (!sws_ctx)
        {
            printf("Cannot create scale context for conversion\n"
                "fmt:%s s:%dx%d --> fmt:%s s:%dx%d\n",
                av_get_pix_fmt_name(src_pix_fmt), src_width, src_height,
                av_get_pix_fmt_name(dst_pix_fmt), dst_width, dst_height);
            return 0;
        }

        sws_scale(sws_ctx, (const uint8_t* const*)frame->data, frame->linesize, 0, frame->height, dst_data, dst_linesize);

        FILE* f;
        char szFilename[32];
        int y;

        snprintf(szFilename, sizeof(szFilename), "frame%d.ppm", avcc->frame_number);
        fopen_s(&f, szFilename, "wb");
        
        if (f == NULL)
        {
            printf("Couldn't open file.\n");
            return 0;
        }
        
        fprintf(f, "P6\n%d %d\n255\n", dst_width, dst_height);

        for (y = 0; y < dst_height; y++)
            fwrite(frameRGB->data[0] + y * frameRGB->linesize[0], 1, dst_width * 3, f);
        
        fclose(f);
    }
}


  


• I am trying to recode my m4v video files with DRM to regular mp4 so I can play on Android [closed]

  5 novembre 2012, par user1708282

  I have several video files from itunes that are .m4v with normal Apple DRM.

  As my PC (Windows Vista) is authorised to play the video I can play them either through itunes or with VLC

  I know it is possible to do this with commercial software, most of which seems to play the video (on an authorised computer) and then re-encode the output stream. This is the approach I would like to take.

  My problem is that I can't get ffmpeg or Mencoder to play the DRM file... but surely it must be possible if VLC can play the file ???

  The goal is to ultimately play the new file on an Android device, but the re-coding will be done (I assume) on a PC.