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• does ffmpeg not support rtsp push with udp ?

  29 septembre 2017, par jimmy

  I’m trying to push a mp4 file through rtsp,and work ok using the cmd below :

  ffmpeg  -i 1.mp4  -vcodec copy -an -rtsp_transport tcp -f rtsp rtsp://192.168.164.40/test.sdp

  But when I try rtsp with udp protocol,it’s not work,cmd like this :

  ffmpeg  -i 1.mp4  -vcodec copy -an -f rtsp rtsp://192.168.164.40/test.sdp

  I tryed to add "-preset:v ultrafast -tune:v zerolatency",and it not worked,and I trace the package flow,and find that ffmpeg just TEARDOWN rtsp after 192.168.164.40 reply RECORD call.

  Below is the output log :

  ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
    configuration: --enable-gpl --enable-nonfree --prefix=/home/share/_release --cc= --enable-nvenc --enable-cuda --enable-cuvid --enable-libnpp --enable-static --disable-shared --disable-debug --extra-cflags='-I/home/server/share/_release/include -I/usr/local/cuda/include' --extra-ldflags='-L/home/server/share/_release/lib -L/usr/local/cuda/lib64 -lm -ldl' --disable-ffplay --disable-ffprobe --disable-ffserver --disable-doc --enable-postproc --enable-zlib --enable-parsers --enable-libx264 --enable-libmp3lame --enable-libfdk-aac --enable-pthreads --extra-libs=-lpthread --enable-encoders --enable-decoders --enable-avfilter --enable-muxers --enable-demuxers
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/server/share/media/1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isom
  
      creation_time   : 2017-02-08T02:33:57.000000Z
  
      encoder         : My MP4Box GUI 0.6.0.6 /my-mp4box-gui.zymichost.com>
  
    Duration: 00:57:23.35, start: 0.000000, bitrate: 330 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], 164 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-12-23T15:11:53.000000Z
  
        handler_name    : 1.mp4
  
        encoder         : AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-02-08T02:34:00.000000Z
  
        handler_name    : 1.mp4
  
      Stream #0:2(und): Data: none (rtp  / 0x20707472), 25 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-02-08T02:34:03.000000Z
  
        handler_name    : GPAC ISO Hint Handler
  
      Stream #0:3(und): Data: none (rtp  / 0x20707472), 9 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-02-08T02:34:07.000000Z
  
        handler_name    : GPAC ISO Hint Handler
  
  Output #0, rtsp, to 'rtsp://192.168.164.40/test.sdp':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isom
  
      encoder         : Lavf57.71.100
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 164 kb/s, 30 fps, 30 tbr, 90k tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 2015-12-23T15:11:53.000000Z
  
        handler_name    : 1.mp4
  
        encoder         : AVC Coding
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  av_interleaved_write_frame(): Invalid argument
  
  frame=    1 fps=0.0 q=-1.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=0.0647x    
  
  video:41kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB 
  
  muxing overhead: unknown
  
  Conversion failed!

  Here is some of the debug log,past it here

      Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  [rtp @ 0x27379c0] Sending NAL 6 of len 15 M=0
  
  [rtp @ 0x27379c0] Sending NAL 5 of len 42371 M=1
  
  [rtp @ 0x27379c0] NAL size 42371 > 1460
  
  av_interleaved_write_frame(): Invalid argument
  
  No more output streams to write to, finishing.
  
  [AVIOContext @ 0x2d4ad80] Statistics: 0 seeks, 32 writeouts
  
  frame=    1 fps=0.0 q=-1.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=0.0743x    
  
  video:41kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Input file #0 (/home/server/share/media/1.mp4):
  
  Input stream #0:0 (video): 1 packets read (42394 bytes); 
  
    Input stream #0:1 (audio): 0 packets read (0 bytes); 
  
    Input stream #0:2 (data): 0 packets read (0 bytes); 
  
    Input stream #0:3 (data): 0 packets read (0 bytes); 
  
    Total: 1 packets (42394 bytes) demuxed
  
  Output file #0 (rtsp://192.168.164.40/test.sdp):
  
    Output stream #0:0 (video): 1 packets muxed (42394 bytes); 
  
  Total: 1 packets (42394 bytes) muxed
  
  0 frames successfully decoded, 0 decoding errors
  
  [AVIOContext @ 0x273afa0] Statistics: 2119132 bytes read, 2 seeks
  
  Conversion failed!

  I googled one day up with no idea,any one helps me !

• yet another screenshot encoding exercise with ffmpeg - stuck at getting AVFrame from ALT::CImage - VC++

  11 septembre 2013, par sith

  Total AV newbee here - trying to learn the ropes on using FFMpeg functions to encode movies. On searching for tutorials I found a few similar questions that I have linked here for reference :

  Encoding a screenshot into a video using FFMPEG

  [Libav-user] Encoding a screenshot into a video using FFMPEG

  Save bitmap to video (libavcodec ffmpeg)

  When converting from RGB to YUV using ffmpeg the video file the color is spread why ?

  How to convert RGB from YUV420p for ffmpeg encoder ?

  Encode bmp sequence with libavcodec...Help !

  Not able to encode image with ffmpeg

  For my setup FFMPEG is on VS12 - VC++ with MFC on win7.

  With the help of above samples, I am able to get "some" output from the encoder, but I am not sure in what format or state the output has been encoded. Neither VLC nor WMP can play this file. It does not even seem to recognize the metadata in the file to display the FPS or video length. What would normally cause that ? Also any pointers on what could be going wrong and how to approach fixing the problems would be great. [1]

  Here is the flow of my code :

  Step1 : capture desktop on to a CImg :

  int W=GetSystemMetrics(SM_CXSCREEN), H=GetSystemMetrics(SM_CYSCREEN), bpp=24; 
  
  CImage cImg; cImg.Create(W,H,bpp) 
  
  HDC hDC = cImg.GetDC(); 
  
  CWindowDC winDC(GetDesktopWindow()); 
  
  
  
  BitBlt(hDC, 0,0, rez.W(), rez.H(), winDC.m_hDC, 0, 0, SRCCOPY);

  At this point I am able to dump a screen shot into a bmp file -
  using cImg.Save( _T("test.bmp"), Gdiplus::ImageFormatBMP) ;

  Step2 : Extract the BMP bits from the CImg.

  HBITMAP hBitmap = (HBITMAP)cImg;
  
  HDC memDC = CreateCompatibleDC(NULL);
  
  SelectObject( memDC, hBitmap );
  
  
  
  BITMAPINFO bmi; // initialized bmi with {W,-H, plane=1, bitCount=24, comp=BI_RGB, size=W*H*3 }
  
  << removed bmi init code for conciseness. >>>
  
  
  
  BYTE *rgb24Data = new BYTE[W*H*3]; // 3 for 24bpp. 4 for 32...
  
  int ret = GetDIBits(memDC, hBitmap, 0, H, rgb24Data, &bmi, DIB_RGB_COLORS);

  At this point I faithfully believe rgb24Data points to pixel data :) - copied out of the cImg bitmap

  Step 3 : next I try to create an AV frame with the rgb24Data got from this CImg. Also this is where I have a massive knowledge gap. I am going to try and recover

  // setup the codecs and contexts here as per mohM's post
  
  
  
  AVCodec *currCodec = avcodec_find_encoder(CODEC_ID_MPEG4);
  
  
  
  AVCodecContext *codeCtxt = avcodec_alloc_context();  // init this with bate=400k, W, H,
  
  << removed codeCtxt init code for conciseness. >>>   //  time base 1/25, gop=10, max_b=1, fmt=YUV420
  
  
  
  avcodec_open(codeCtxt, currCodec);
  
  
  
  SwsContext *currSWSCtxt = sws_getContext( W, H, AV_PIX_FMT_RGB24, // FROM
  
                                            W, H, AV_PIX_FMT_YUV420P, // TO
  
                                            SWS_FAST_BILINEAR,
  
                                            NULL, NULL, NULL);
  
  
  
  // allocate and fill AVFrame
  
  int numBytes = avpicture_get_size(PIX_FMT_YUV420P, W, H);
  
  uint8_t *buffer=new uint8_t[numBytes];
  
  AVFrame *avFrame = avcodec_alloc_frame();
  
  avpicture_fill( (AVPicture*)avFrame, buffer, PIX_FMT_YUV420P, W, H );

  Step 4 : transform the data frame into YUV420P as we fill the frame.

  uint8_t * inData[1] = { rgb24Data };
  
  int inLinesize[1] = { 3*W }; // RGB stride
  
  sws_scale( currSWSCtxt, inData, inLinesize, 0, H,
  
             avFrame->data, avFrame->linesize);

  step 5 encode the frame and write out the output buffer into a file.

  int out_size = avcodec_encode_video( codeCtxt,
  
                                       outBuf,
  
                                       outBufSize,
  
                                       avFrame );
  
  
  
  fwrite(outBuf, 1, outBufSize, outFile );

  finally I close the file off with [0x00 0x00 0x01 0xb7]

  The first hint of things gone haywire is that for a 50 screens of 1920X1080 at 24bpp encoded at 25fps gives me a 507MB unplayable-mpeg file.

  As mentioned earlier, neither VLC nor WMP can play this file nor they even recognize the metadata in the file to display the FPS or video length. What would normally cause that ? Also any pointers on what could be going wrong and how to approach fixing the problems would be great. [2]

  Any guidance is much appreciated.

• How to use ffmpeg capture screen (not command) ?

  16 novembre 2022, par Tom

  I am looking for example on the Internet, but none of the relevant examples can be run. Always I compile the no match ffmpeg version. Could someone share a example to learn ?