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• Parse closed captions from H264 stream (HDHomeRun)

  5 mai 2018, par Ladinn

  I’ve been researching on here and other websites for the past few days and haven’t found anything that accomplishes exactly what I’m looking for.

  I have an HDHomeRun that transmits cable TV over LAN. I’m hoping to parse only the closed captioning and get the text output. I’ll eventually be using Fluent FFmpeg so I would hope that the text can be easily piped through there or to a text file.

  Here is the output of ffprobe :

  Input #0, mpegts, from 'http://10.0.0.10:5004/auto/v819':
 Duration: N/A, start: 32788.639133, bitrate: N/A
 Program 6
   Stream #0:0[0x18f0]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
   Stream #0:1[0x18f1](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s
   Stream #0:2[0x18f2]: Data: scte_35
   Stream #0:3[0x18f3]: Unknown: none (ETV1 / 0x31565445)
   Stream #0:4[0x18f4]: Unknown: none (ETV1 / 0x31565445)
   Stream #0:5[0x18f5]: Unknown: none ([192][0][0][0] / 0x00C0)

  As you can see, "Closed Captions" are on Stream #0:0. The captions appear on the VLC client, so I know they’re there.

  As mentioned I’m hoping to use FFmpeg, but VLC’s command line would work too.

  Thanks !

• avformat/mpegts : skip non-PMT tids earlier

  9 mai 2018, par Aman Gupta

  avformat/mpegts : skip non-PMT tids earlier
  This mimics the logic flow in all the other callbacks
  
  (pat_cb, sdt_cb, m4sl_cb), and avoids calling skip_identical()
  
  for non PMT_TID packets.
  Since skip_identical modifies internal state like
  
  MpegTSSectionFilter.last_ver, this change prevents unnecessary
  
  reprocessing on some streams which contain multiple tables in
  
  the PMT pid. This can be observed with streams from certain US
  
  cable providers, which include both tid=0x2 and another unspecified
  
  tid=0xc0.
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  

  • [DH] libavformat/mpegts.c

• DirectShow AJA Audio capture with FFMPEG

  29 septembre 2021, par NiCO

  I have an AJA board with an SDI input cable connected to it.
The input signal has video and audio embeded.

  



  The video is accesible through the "Vid" Pin and the audio is accesible through the "Aud 1-2" pin.

  



  Well running DirectShow filter graphs :

  



  

  



  

  



  "No Direct Show Audio Devices" :

  



  

  



  I cannot get FFMPEG to correctly map the audio part.

  



  This is what I tried without success to record the audio :

  



  ffmpeg -y -rtbufsize 2048M -f dshow -i audio="AJA S-Capture KonaLHi- 0"  -acodec pcm_s24le -ar 48000 output.wav

ffmpeg -y -rtbufsize 2048M -f dshow -audio_pin_name "Aud 1-2" -i audio="AJA S-Capture KonaLHi- 0"  -acodec pcm_s24le -ar 48000 output.wav


  



  this is the return error I get
return error :

  



  

  



  The filter is NOT being used by any other software.
I have no problems recording the video.