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• Possible to stream video over 115kbps ?

  15 mai 2014, par Arcadio Alivio Sincero

  I need some advice from people experienced with streaming video.

  I have a task to put together a system that allows video coming from RS-170 (composite) video cameras and have them displayed on an iPad. The catch is that no wireless (no Wi-Fi, no bluetooth) is allowed. Only a wired interface.

  The physical I/O options on an iPad are apparently extremely limited, but I did manage to come across a company named Redpark that makes an RS232-to-Lightning cable. So my proposed solution is to have the video feeds go into a box with software that digitizes and encodes the video, and then sends it over RS232 to the iPad using that cable. The catch here is that the maximum bandwidth on that cable is 115kbps.

  My preliminary testing of this setup on a prototype system have been less than stellar so far. I set up two PCs, each with serial ports, and hooked them together with a null modem. I then set the baud rates of the ports to 115kpbs and then attempted to stream a web cam video feed over the serial connection in real-time using ffmpeg. The results weren’t very encouraging, but I at least did manage to get some sort of image to show up.

  I guess I need to play around with the ffmpeg encoding options some more. But I need to ask : am I wasting my time with this idea, or should what I am asking here be possible ?

• Revision 1eb6e683f2 : Add superframe support for frame parallel decoding. A superframe is a bunch of

  13 juin 2014, par hkuang

  Changed Paths :
   Modify /vp9/vp9_dx_iface.c

  
  
  Add superframe support for frame parallel decoding.

  A superframe is a bunch of frames that bundled as one frame. It is mostly
  used to combine one or more non-displayable frames and one displayable frame.

  For frame parallel decoding, libvpx decoder will only support decoding one
  normal frame or a super frame with superframe index.

  If an application pass a superframe without superframe index or a chunk
  of displayable frames without superframe index to libvpx decoder, libvpx
  will not decode it in frame parallel mode. But libvpx decoder still could
  decode it in serial mode.

  Change-Id : I04c9f2c828373d64e880a8c7bcade5307015ce35

• Revision 7eca086707 : Add segmentation map array for current and last frame segmentation. The origina

  17 juillet 2014, par hkuang

  Changed Paths :
   Modify /vp9/common/vp9_alloccommon.c

  
   Modify /vp9/common/vp9_alloccommon.h

  
   Modify /vp9/common/vp9_entropymode.c

  
   Modify /vp9/common/vp9_onyxc_int.h

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/decoder/vp9_decoder.c

  
  
  Add segmentation map array for current and last frame segmentation.

  The original implementation only allocates one segmentation map and this
  works fine for serial decode. But for frame parallel decode, each thread
  need to have its own segmentation map and the last frame segmentation map
  should be provided from last frame decoding thread.

  After finishing decoding a frame, thread need to serve the old segmentation
  map that associate with the previous decoded frame. The thread also need to
  use another segmentation map for decoding the current frame.

  Change-Id : I442ddff36b5de9cb8a7eb59e225744c78f4492d8