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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.

• SDL2.0 Alternative for SDL_Overlay

  19 juin 2019, par Josh

  So I’ve been trying to go through the following tutorial on ffmpeg : http://dranger.com/ffmpeg/tutorial02.html

  However, when I try to compile using gcc, I get the following output :

  root:/Users/mbrodeur/Downloads/HACKATHON CONTENT/Tutorials-> gcc -o tutorial02 tutorial02.c -lavutil -lavformat -lavcodec -lz -lavutil -lm -lswscale -D_THREAD_SAFE -lSDL2
  
  tutorial02.c: In function ‘main’:
  
  tutorial02.c:41: error: ‘SDL_Overlay’ undeclared (first use in this function)
  
  tutorial02.c:41: error: (Each undeclared identifier is reported only once
  
  tutorial02.c:41: error: for each function it appears in.)
  
  tutorial02.c:41: error: ‘bmp’ undeclared (first use in this function)
  
  tutorial02.c:98: warning: assignment makes pointer from integer without a cast
  
  tutorial02.c:110: error: ‘SDL_YV12_OVERLAY’ undeclared (first use in this function)

  Now, I read that SDL_Overlay is no longer used in SDL2, so therein lies the problem. I’ve been poking around, but can’t seem to find anything helpful. Is there a replacement for SDL_Overlay ? Is it necessary ?

  SDL_Overlay is used in the following context :

  SDL_Overlay     *bmp;
  
  bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,
  
                         SDL_YV12_OVERLAY, screen);

• avformat/avformat.h : Correct some comments

  9 août 2019, par Andreas Rheinhardt

  avformat/avformat.h : Correct some comments
  1. When set_parameters was removed from AVOutputFormat in 2fb75019, it
  
  was forgotten to remove the comment pertaining to it. Said comment now
  
  appeared to apply to interleave_packet() ; it is of course nonsense and
  
  has been replaced by an accurate description.
  
  2. The description of av_write_uncoded_frame() suggested
  
  av_interleaved_write_frame() as a replacement if the input is not
  
  already correctly interleaved ; it also referred to said function for
  
  details. Given that said function can't write AVFrames and that the
  
  specifics of writing uncoded frames are explained in the description
  
  of av_interleaved_write_uncoded_frame(), both references have been fixed.
  
  3. Removed an outdated comment about avformat_seek_file().
  Reviewed-by : Marton Balint <cus@passwd.hu>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/avformat.h