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• how to configure ffmpeg pipline for streaming

  30 juin 2021, par Changhoon Lee

  I want to get real-time streaming data (use mediasuop) and send it to nginx-rtmp-server via ffmpeg, but if I run it through the pipeline, the error occurs after logging as below. I checked that the rtmp server works well through OBS studio program, but when I run with the pipeline I prepared, the error occurs. Do you know where this problem occurs ?

  


  Problems with the pipeline ? Problem with Sdp ? Or something else ?

  


  my pipe line

  


  ffmpeg
-loglevel
debug
-nostdin
-protocol_whitelist
file,pipe,udp,rtp,rtmp
-analyzeduration 30M
-probesize
30M
-f
sdp
-i
pipe:0
-map 0:v:0
-c:v copy -map
0:a:0 -strict -2
-c:a aac

-flags +global_headers

{filePath}.flv

-pix_fmt
yuv420p
-preset
ultrafast
-use_wallclock_as_timestamps
1
-tune zerolatency
-qmin 2
-qmax 51
-muxrate 1300k
-sdp_file {file}.sdp
-r 30
-b:v 1000k
-bufsize 3000k
-minrate 500k
-maxrate 2000k
-qscale 3
-threads 4
-b:a 128k
-framerate 30
-g 50
-crf 30
-ar 44100
-s 400x700
-f
flv

rtmp://{rtmpServerUri}


  


  and my sdp file

  


      v=0
  o=- 0 0 IN IP4 127.0.0.1
  s=FFmpeg
  c=IN IP4 127.0.0.1
  t=0 0
  m=video 23490 RTP/AVP 101 
  a=rtpmap:101 VP8/90000
  a=sendonly
  m=audio 29773 RTP/AVP 100 
  a=rtpmap:100 opus/48000/2
  a=sendonly


  


  and ErrorLog

  


  ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers
built with Apple clang version 12.0.5 (clang-1205.0.22.9)

'  libavutil      56. 70.100 / 56. 70.100\n' +
  '  libavcodec     58.134.100 / 58.134.100\n' +
  '  libavformat    58. 76.100 / 58. 76.100\n' +
  '  libavdevice    58. 13.100 / 58. 13.100\n' +
  '  libavfilter     7.110.100 /  7.110.100\n' +
  '  libavresample   4.  0.  0 /  4.  0.  0\n' +
  '  libswscale      5.  9.100 /  5.  9.100\n' +
  '  libswresample   3.  9.100 /  3.  9.100\n' +
  '  libpostproc    55.  9.100 / 55.  9.100\n' +

"Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'
"Reading option '-nostdin' ... matched as option 'stdin' (enable or disable interaction on standard input) with argument 0"
"Reading option '-protocol_whitelist' ... matched as AVOption 'protocol_whitelist' with argument 'file,pipe,udp,rtp,rtmp'"
"Reading option '-analyzeduration' ... matched as AVOption 'analyzeduration' with argument '30M'"
"Reading option '-probesize' ... matched as AVOption 'probesize' with argument '30M'"
"Reading option '-f' ... matched as option 'f' (force format) with argument 'sdp'"
"Reading option '-i' ... matched as input url with argument 'pipe:0'"
"Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '0:v:0'"
"Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'copy'"
"Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '0:a:0'"
"Reading option '-strict' ..."

Routing option strict to both codec and muxer layer

matched as AVOption 'strict' with argument '-2'.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'aac'.
Reading option '-flags' ... matched as AVOption 'flags' with argument '+global_header'.
Reading option '{filePath}.flv' ... matched as output url." +
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv420p'" 
Reading option '-preset' ... matched as AVOption 'preset' with argument 'ultrafast'." 
Reading option '-use_wallclock_as_timestamps' ... matched as AVOption 'use_wallclock_as_timestamps' with argument '1'." 
Reading option '-tune' ... matched as AVOption 'tune' with argument 'zerolatency'." 
Reading option '-qmin' ... matched as AVOption 'qmin' with argument '2'." 
Reading option '-qmax' ... matched as AVOption 'qmax' with argument '51'." 
Reading option '-muxrate' ... matched as AVOption 'muxrate' with argument '1300k'." 
Reading option '-sdp_file' ... matched as option 'sdp_file' (specify a file in which to print sdp information) with argument '{filename}.sdp'." 
Reading option '-r' ... matched as option 'r' (set frame rate (Hz value, fraction or abbreviation)) with argument '30'"
Reading option '-b:v' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '1000k
Reading option '-bufsize' ... matched as AVOption 'bufsize' with argument '3000k'
Reading option '-minrate' ... matched as AVOption 'minrate' with argument '500k'
Reading option '-maxrate' ... matched as AVOption 'maxrate' with argument '2000k'
Reading option '-qscale' ... matched as option 'qscale' (use fixed quality scale (VBR)) with argument '3'
Reading option '-threads' ... matched as AVOption 'threads' with argument '4
Reading option '-b:a' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '128k'
Reading option '-framerate' ... matched as AVOption 'framerate' with argument '30'
Reading option '-g' ... matched as AVOption 'g' with argument '50'
Reading option '-crf' ... matched as AVOption 'crf' with argument '30'
Reading option '-ar' ... matched as option 'ar' (set audio sampling rate (in Hz)) with argument '44100
Reading option '-s' ... matched as option 's' (set frame size (WxH or abbreviation)) with argument '400x700'
Reading option '-f' ... matched as option 'f' (force format) with argument 'flv'.
Reading option 'rtmp:{rtmpserver} ' ... matched as output url
Finished splitting the commandline.\n' +
Parsing a group of options: global .\n' +
Applying option loglevel (set logging level) with argument debug.\n' +
Applying option nostdin (enable or disable interaction on standard input) with argument 0.\n' +
Applying option sdp_file (specify a file in which to print sdp information) with argument {filename}.sdp
Successfully parsed a group of options
Parsing a group of options: input url pipe:0
Applying option f (force format) with argument sdp.
Successfully parsed a group of options
Opening an input file: pipe:0.
[sdp @ 0x12e008e00] Opening 'pipe:0' for reading

[sdp @ 0x12e008e00] video codec set to: vp8\n' +
[sdp @ 0x12e008e00] audio codec set to: opus\n' +
[sdp @ 0x12e008e00] audio samplerate set to: 48000\n' +
[sdp @ 0x12e008e00] audio channels set to: 2\n' +
[udp @ 0x12c610b70] end receive buffer size reported is 393216\n' +
[udp @ 0x12c610c30] end receive buffer size reported is 393216\n' +
[sdp @ 0x12e008e00] setting jitter buffer size to 500\n' +
[udp @ 0x12c611290] end receive buffer size reported is 393216\n' +
[udp @ 0x12c611330] end receive buffer size reported is 393216\n' +
[sdp @ 0x12e008e00] setting jitter buffer size to 500\n' +
[sdp @ 0x12e008e00] Before avformat_find_stream_info() pos: 310 bytes read:310 seeks:0 nb_streams:2\n'

[sdp @ 0x12e008e00] Could not find codec parameters for stream 0 (Video: vp8, 1 reference frame, yuv420p): unspecified size\n' +
  "Consider increasing the value for the 'analyzeduration' (30000000) and 'probesize' (30000000) options

'Codec AVOption qmin (minimum video quantizer scale (VBR)) specified for output file #1 (rtmp:{rtmpserver}) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream

[rtmp @ 0x11c604310] No default whitelist set
[rtmp @ 0x11c604310] No default whitelist set

Starting connection attempt to {server} port 1935
[tcp @ 0x10c6054a0] Successfully connected to {server} port 1935
[rtmp @ 0x11c604310] Handshaking...
[rtmp @ 0x11c604310] Proto = rtmp, path = {serverpath}, app = live, fname = {filename}'
[rtmp @ 0x11c604310] Window acknowledgement size = 5000000
[rtmp @ 0x11c604310] Max sent, unacked = 5000000
[rtmp @ 0x11c604310] New incoming chunk size = 4096
[rtmp @ 0x11c604310] Releasing stream
[rtmp @ 0x11c604310] FCPublish stream
[rtmp @ 0x11c604310] Creating stream
[rtmp @ 0x11c604310] Sending publish command for {filename}

Successfully opened the file

Stream mapping

Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (opus (native) -> aac (native)
Stream #0:1 -> #1:0 (opus (native) -> mp3 (libmp3lame)
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:1 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
pipe:0: Operation timed out
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:3] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:1 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
detected 8 logical cores
[graph_0_in_0_1 @ 0x10c605b50] Setting 'time_base' to value '1/48000
[graph_0_in_0_1 @ 0x10c605b50] Setting 'sample_rate' to value '48000'
[graph_0_in_0_1 @ 0x10c605b50] Setting 'sample_fmt' to value 'fltp'
[graph_0_in_0_1 @ 0x10c605b50] Setting 'channel_layout' to value '0x3'
[graph_0_in_0_1 @ 0x10c605b50] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x3
[format_out_0_1 @ 0x10c605ea0] Setting 'sample_fmts' to value 'fltp'
[format_out_0_1 @ 0x10c605ea0] Setting 'sample_rates' to value '96000|88200|64000|48000|44100|32000|24000|22050|16000|12000|11025|8000|7350'
[AVFilterGraph @ 0x12d204de0] query_formats: 4 queried, 9 merged, 0 already done, 0 delayed

//// error ////

[flv @ 0x10c80aa00] dimensions not set
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:1

[AVIOContext @ 0x10c6040a0] Statistics: 0 seeks, 0 writeouts
[AVIOContext @ 0x10c6040a0] Statistics: 0 seeks, 0 writeouts
[rtmp @ 0x11c604310] UnPublishing stream
[rtmp @ 0x11c604310] Deleting stream
[aac @ 0x10c80ce00] Qavg: nan\n']
[AVIOContext @ 0x12d005120] Statistics: 310 bytes read, 0 seeks
Conversion failed!


  


  I'd appreciate it if you could tell me why not...

  


• How can I get matplotlib to show full subplots in an animation ?

  12 mars 2015, par Matt Stone

  I’m trying to write a simple immune system simulator. I’m modeling infected tissue as a simple grid of cells and various intracellular signals, and I’d like to animate movement of cells in one plot and the intensity of viral presence in another as the infection progresses. I’m doing so with the matshow function provided by matplotlib. However, when I plot the two next to each other, the full grid gets clipped unless I stretch out the window myself. I can’t address the problem at all when saving to an mp4.

  Here’s the default view, which is identical to what I observe when saving to mp4 :
  

  And here’s what it looks like after stretching out the viewer window
  

  I’m running Python 2.7.9 with matplotlib 1.4.2 on OS X 10.10.2, using ffmpeg 2.5.2 (installed via Homebrew). Below is the code I’m using to generate the animation. I tried using plt.tight_layout() but it didn’t affect the problem. If anyone has any advice as to how to solve this, I’d really appreciate it ! I’d especially like to be able to save it without viewing with plt.show(). Thanks !

  def animate(self, fname=None, frames=100):
  
      fig, (agent_ax, signal_ax) = plt.subplots(1, 2, sharey=True)
  
  
  
      agent_ax.set_ylim(0, self.grid.shape[0])
  
      agent_ax.set_xlim(0, self.grid.shape[1])
  
      signal_ax.set_ylim(0, self.grid.shape[0])
  
      signal_ax.set_xlim(0, self.grid.shape[1])
  
  
  
      agent_mat = agent_ax.matshow(self.display_grid(),
  
                                   vmin=0, vmax=10)
  
      signal_mat = signal_ax.matshow(self.signal_display(virus),
  
                                     vmin=0, vmax=20)
  
      fig.colorbar(signal_mat)
  
  
  
      def anim_update(tick):
  
          self.update()
  
          self.diffuse()
  
          agent_mat.set_data(self.display_grid())
  
          signal_mat.set_data(self.signal_display(virus))
  
          return agent_mat, signal_mat
  
  
  
      anim = animation.FuncAnimation(fig, anim_update, frames=frames,
  
                                     interval=3000, blit=False)
  
  
  
      if fname:
  
          anim.save(fname, fps=5, extra_args=['-vcodec', 'libx264'])
  
      else:
  
          plt.show()

• ffmpeg can't read png data on iphone

  10 octobre 2014, par user2789801

  I’m using ffmpeg to decode a png picture and use the AVFrame as a opengl texture.
  But the strangest thing is that I can get the png converted to opengl texture nicely on a iphone simulator, but I got a blank texture on a real iphone.

  on both simulator and iphone, I got a null pointer for AVFrame’s data

  avcodec_decode_video2(codecContext/* AVCodecContext* */,frame /* AVFrame */,&finished,&tempPacket); 

  Then I covert the color space to AV_PIX_FMT_RGBA

  void convertToRGBColor()
  
  {
  
      int numBytes = avpicture_get_size(
  
                                    AV_PIX_FMT_RGBA,
  
                                    codecContext->width,
  
                                    codecContext->height);
  
      uint8_t *buffer = (uint8_t *)av_malloc(numBytes);
  
      avpicture_fill(rgbFrame/* AVFrame* */, buffer, AV_PIX_FMT_RGBA, codecContext->width, codecContext->height);
  
  
  
      struct SwsContext *img_convert_ctx = NULL;
  
      img_convert_ctx = sws_getCachedContext(
  
                           img_convert_ctx,
  
                           codecContext->width,
  
                           codecContext->height,
  
                           codecContext->pix_fmt,
  
                           codecContext->width,
  
                           codecContext->height,
  
                           COLOR_SPACE,
  
                           SWS_BILINEAR,
  
                           NULL,
  
                           NULL,
  
                           NULL);
  
  
  
      if( !img_convert_ctx )
  
      {
  
          fprintf(stderr, "Cannot initialize sws conversion context\n");
  
      }
  
  
  
      sws_scale(img_convert_ctx,
  
                frame->data,
  
                frame->linesize,
  
                0,
  
                codecContext->height,
  
                rgbFrame->data,
  
                rgbFrame->linesize);
  
      sws_freeContext(img_convert_ctx);
  
  }

  On a simulator, rgbFrame’s data[0] will be a valid pointer, but on a iphone, it’s null.

  So, does anyone had the same problem before ?