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• usb_fill_bulk_urb with less buffer_length gives no garbage Transport stream data

  4 février 2015, par user3570793

  Currently I am working on a DVB-T2 dongle which is connected to my Ubuntu laptop 14.04 using USB

  interface.

  I am using following applications to perform scanning and channel play.
  1. w_scan - which scans and gives me a channel.conf file
  2. vlc ./channel.conf - plays a channel using modulation parameters in channel.conf

  Things work fine when Pid filtering is disabled. But when Pid filtering is enabled, I see

  macroblocks on the screen instead of smooth AV. Even AV is breaking a lot.

  After going through the driver code, I tried increasing the URB buffer size from 3K (21*188) to

  64K (348*188). The AV became smooth.

  This urb buffer size is buffer_length (lenght of transport buffer) in below function.

  void usb_fill_bulk_urb (struct urb * urb, struct usb_device * dev,
  unsigned int pipe, void * transfer_buffer,
  int buffer_length, usb_complete_t complete_fn,
  void * context) ;

  As you can see the driver uses bulk mode of usb transfer.

  Could anyone explain me why increasing the buffer is solving the macroblock issue ?

  Give me some pointers to understand this issue better.

  Thanks in advance,
  Murali

• FFMPEG - Dynamic SWF File to MP4

  2 décembre 2014, par Mavichow

  I downloaded FFMPEG at here for my window x64.

  And here is my .php file that stored at Localhost :

  $ffmpeg = 'D:\Software\ffmpeg-20141202-git-4280150-win64-static\bin\ffmpeg.exe';
  
  $swf    = "http://symmetrydigital-labs.com/junior/kazim/portal/flv/Shahid_Kapoor_07.swf";
  
  
  
  $cmd    = "$ffmpeg -i $swf test.mp4";
  
  shell_exec($cmd);

  above code are working great and fine, because the SWF its a static SWF,
  But when I need to convert this SWF, that require Dynamic Parameter, or the swf is scripted in AS3.

  Then it went error and can’t convert to .mp4 file.

  $ffmpeg = 'D:\Software\ffmpeg-20141202-git-4280150-win64-static\bin\ffmpeg.exe';
  
  $swf    = "http://www.permadi.com/tutorial/flashQueryString/loaderInfoExample.swf?userName=12322";
  
  
  
  $cmd    = "$ffmpeg -i $swf test.mp4";
  
  shell_exec($cmd);

  And I try to execute on Command line,
  and I found out Could not find Codec parameter Error,

  

• Merge commit ’9d5fed6dc4cccb0689f694112f5026988bebc472’

  9 octobre 2014, par Michael Niedermayer

  Merge commit ’9d5fed6dc4cccb0689f694112f5026988bebc472’
  * commit ’9d5fed6dc4cccb0689f694112f5026988bebc472’ :
  
    avcodec : fix descriptions on color transfer options
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/options_table.h