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• ffmpeg dshow Frame dropped on removal and re-insertion of headset

  11 février 2019, par Debendra Modi

  I am using avformat_open_input and av_read_frame to capture audio frames from my usb headset (speaker and mic - "audio=virtual-audio-capturer" and my usb mic device) and then further processing of the frame. Everything works fine. I can run my code for days without any issue. However, when I remove my headset from the usb jack, as expected av_read_frame gives an error code -5.

  At this time, I close my input device using avformat_close_input and try to open the input device. This continues to fail till I re-insert my headset. I am then again able to capture the frames and process them. However, after some time, I get messages as follows from the ffmpeg library -

  [dshow @ 0a529040] real-time buffer [virtual-audio-capturer] [audio input] too full or near too full (99% of size : 3041280 [rtbufsize parameter]) ! frame dropped !

  It appears dshow continues to capture frames although I have closed the input. Most forums mention to increase the rtbufsize, but that may not be a proper solution specially if I want to remove my headset for long duration.

  Isn’t there any way to stop dshow from capturing frames so that i am able to run my code without dropping frames, regardless of how many times or how long I remove the headset ?

  Thanks in advance.

• How to see what default settings are set in FFMPEG Libx264/265 ? [closed]

  4 septembre 2023, par Олег Ю.

  I want to see the full settings that codecs use. Otherwise, you constantly need to try to encode and see the result.

  


  I tried

  


  -h encoder=libx265
x265 --help



  


  It shows a little information. The same is of interest for libx264.

  


• subprocess.call can't find file/shutil.which failed in pycharm

  4 décembre 2022, par Percy Yang

  I am trying to transform a mp3 to a wav file in pycharm using subprocess

  


  import subprocess
subprocess.call(['ffmpeg', '-i','test.mp3','test.wav'])


  


  It returns error of not finding file, so I change the 'ffmpeg' to its path on my pc and it work.

  


  The problem is that I am making an app and others might install ffpmeg on other's location (since it is download with zip and can be unzip at any place), but I don't know how to get its full path.

  


  I tried using os module

  


  import os
print(os.path('ffmpeg.exe'))


  


  but it seems like it is not able to get the path of exe

  


  Traceback (most recent call last):&#xA;  File "C:\Users\Percy\PycharmProjects\APP\test3.py", line 8, in <module>&#xA;    print(os.path(&#x27;ffmpeg.exe&#x27;))&#xA;TypeError: &#x27;module&#x27; object is not callable&#xA;</module>

  


  I also tried shutil module

  


  import shutil
print(shutil.which('ffmpeg'))
print(shutil.which('ffmpeg.exe'))


  


  but it returns 2 None (prob wrong cause I am 100% sure I have installed ffmpeg)

  


  None
None


  


  I want to ask if there is any way to get the full path of ffmpeg in pycharm or any method that I can make ffmpeg install in designated path with the app when it is downloaded by users