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• vdpau : add av_vdpau_bind_context()

  4 octobre 2014, par Rémi Denis-Courmont

  vdpau : add av_vdpau_bind_context()
  This function provides an explicit VDPAU device and VDPAU driver to
  
  libavcodec, so that the application is relieved from codec specifics
  
  and VdpDevice life cycle management.
  A stub flags parameter is added for future extension. For instance, it
  
  could be used to ignore codec level capabilities (if someone feels
  
  dangerous).
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] doc/APIchanges
  • [DBH] libavcodec/vdpau.c
  • [DBH] libavcodec/vdpau.h
  • [DBH] libavcodec/vdpau_internal.h
  • [DBH] libavcodec/version.h

• ffserver streaming h.264 raw data

  11 novembre 2014, par Samuel David Hudson

  I have a c++/openGL application which generate a .h264 stream using a hardware encoder (nvidia grid). Im using ffserver to serve the stream to be consumed via a url.

  The application writes out the stream data to a file on disk, which gets added to as time goes by.

  ffserver.conf

  # Port on which the server is listening. You must select a different
  
  # port from your standard HTTP web server if it is running on the same
  
  # computer.
  
  HttpPort 8090
  
  
  
  <stream>
  
      File "/home/ec2-user/demo/movie.h264"
  
      NoAudio
  
      Format mpegts
  
  </stream>

  The problem i am having is that whenever you view the stream, it starts from the begining of the data, rather than from ’now’. I want the stream to be as realtime as possible.

  Does anyknow know how i might achieve this ?

• 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