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• FFmpeg : real-time buffer[ ] [input] too full or near too full (101% of size : 3041280 [rtbufsize parameter]) frame dropped

  16 décembre 2020, par lostin2010

  I use the library of ffmpeg to decode stream from [TTQ HD Camera] and encode it to a rtmp stream.
but I receive a lot of warnings like the picture below.
i try to set qmin and qmax , it seems a little better. but still not totally resolve the problem.

  



  encoder_context->qmin = 10;
encoder_context->qmax = 51;


  



  who knows this is why ?

  



  [dshow @ 04bfc640] real-time buffer [TTQ HD Camera] [video input] too full or near too full (101% of size: 3041280 [rtbufsize parameter])! frame dropped!


  



  

  


• How to get full name of default microphone ?

  9 août 2019, par Jiapeng Li

  Been trying to get full name of microphone as a variable on Python for usage of ffmpeg. I have already tried

  p = pyaudio.PyAudio()
  
  default_device = p.get_default_input_device_info()
  
  print(default_device['name'])

  and here was the output :

  Microphone (Conexant SmartAudio         #it was truncated to 31 characters length

  Obviously,that was truncated and not what i wanted.
  Tried sounddevice too :

  import sounddevice as sd
  
  s = sd.query_devices()
  
  print(s)

  Output :

     0 Microsoft Sound Mapper - Input, MME (2 in, 0 out)
  
  >  1 Microphone (Conexant SmartAudio, MME (2 in, 0 out)           #still truncated
  
     2 Microsoft Sound Mapper - Output, MME (0 in, 2 out)
  
  <  3 Speakers (Conexant SmartAudio H, MME (0 in, 2 out)
  
     4 Primary Sound Capture Driver, Windows DirectSound (2 in, 0 out)
  
     5 Microphone (Conexant SmartAudio HD), Windows DirectSound (2 in, 0 out)    #now got normal,but why?
  
     6 Primary Sound Driver, Windows DirectSound (0 in, 2 out)
  
     7 Speakers (Conexant SmartAudio HD), Windows DirectSound (0 in, 2 out)
  
     8 Speakers (Conexant SmartAudio HD), Windows WASAPI (0 in, 2 out)
  
     9 Microphone (Conexant SmartAudio HD), Windows WASAPI (2 in, 0 out)
  
    10 Stereo Mix (Conexant HD Stereo Mix), Windows WDM-KS (2 in, 0 out)
  
    11 Microphone (Conexant HD Audio capture), Windows WDM-KS (2 in, 0 out)
  
    12 Speakers (Conexant HD Audio output), Windows WDM-KS (0 in, 2 out)

  It can be seen that device number 1 was my default one and if that was full name it would be perfect but unfortunately that was not.

  Then the only thing i could have thought of was to capture full name from list that ffmpeg provided :

  'ffmpeg -list_devices true -f dshow -i dummy':
  
  [dshow @ 000001cc4f298d00] DirectShow video devices (some may be both video and audio devices)
  
  [dshow @ 000001cc4f298d00]  "USB2.0 VGA UVC WebCam"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_pnp_\\?\usb#vid_13d3&pid_5a07&mi_00#6&2f27e633&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
  
  [dshow @ 000001cc4f298d00]  "screen-capture-recorder"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{4EA69364-2C8A-4AE6-A561-56E4B5044439}"
  
  [dshow @ 000001cc4f298d00] DirectShow audio devices
  
  [dshow @ 000001cc4f298d00]  "Microphone (Conexant SmartAudio HD)"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{AFE404CD-A721-49BE-8AC5-669DA725185F}"
  
  [dshow @ 000001cc4f298d00]  "virtual-audio-capturer"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{8E146464-DB61-4309-AFA1-3578E927E935}"

  I used

  popen = subprocess.Popen('ffmpeg -list_devices true -f dshow -i dummy', stdout=subprocess.PIPE)
  
  popen.wait()
  
  
  
  lines = popen.stdout.readlines()
  
  print(lines)

  After that i got totally confused because the output was an empty list. Now i am lost in desert and know nowhere to go. Really appreciate it if you could help.

• Format ffmpeg command to extract the full klv for an mpg/ts file

  24 décembre 2020, par Andrew Marquez

  I am extracting the KLV data from an mpg file using klvdata and ffmpeg.

  



  Following the readme, I have downloaded the sample "Day Flight.mpg" video file that contains KLV data. Running the quick start command works (I get the exact same result as the readme example for the first 6 frames.)

  



  However, for the life of me I don't know how I can extract the KLV data for the entire video file.

  



  As an experiment, I tried creating the KLV data file from an offset start :

  



  ffmpeg -ss 5 -i Day\ Flight.mpg -map data-re -codec copy -f data - > out.klv


  



  and when I run it through my code with different start times (5, 25, etc.) I do get different results.

  



  This (to me) would suggest that the mpg file does contain KLV data throughout, but I can only access 6 frames at a time.

  



  I would expect to be able to run an ffmpeg command to output the full KLV data. I need help formatting my ffmpeg command to properly provide all the data.

  



  To replicate, download the "Day Flight.mpg" file from the klvdata project page and run the command I posted above. You will note it is less than a page long. It should be many, many pages long. Thank you for your help !