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• Undefined reference when building libvpx

  24 août 2016, par bot1131357

  I am trying to build libvpx as a static library, to be later used in an FFmpeg build and I am having trouble. The version of libvpx I am using is 1.6.0.

  Here’s my config :
  ./configure —prefix=/home/test/Dev/build-x64/libvpx/ —enable-static —disable-shared —target=x86_64-linux-gcc

  And during make, there are lots of errors being dumped on screen :

  [LD] test_libvpx
  
  test/add_noise_test.cc.o: In function `(anonymous namespace)::gtest_CAddNoiseTest_EvalGenerator_()':
  
  add_noise_test.cc:(.text+0x342): undefined reference to `vpx_plane_add_noise_c'
  
  test/add_noise_test.cc.o: In function `(anonymous namespace)::gtest_SSE2AddNoiseTest_EvalGenerator_()':
  
  add_noise_test.cc:(.text+0x492): undefined reference to `vpx_plane_add_noise_sse2'
  
  test/add_noise_test.cc.o: In function `(anonymous namespace)::AddNoiseTest_CheckCvsAssembly_Test::TestBody()':
  
  add_noise_test.cc:(.text+0x2437): undefined reference to `vpx_setup_noise'
  
  add_noise_test.cc:(.text+0x2448): undefined reference to `vpx_calloc'
  
  add_noise_test.cc:(.text+0x245a): undefined reference to `vpx_calloc'
  
  add_noise_test.cc:(.text+0x2779): undefined reference to `vpx_plane_add_noise_c'
  
  add_noise_test.cc:(.text+0x2934): undefined reference to `vpx_free'
  
  add_noise_test.cc:(.text+0x293c): undefined reference to `vpx_free'
  
  (...and a lot more.)

  Recognising that the error started with tests, I tried disabling unit test :
  ./configure —prefix=/home/test/Dev/build-x64/libvpx/ —enable-static —disable-shared —target=x86_64-linux-gcc —disable-unit-tests

  And got this instead :
  (...lots of lines...)
  [CC] examples/resize_util.c.o
  [LD] examples/resize_util
  examples/resize_util.c.o : In function

  main':
   resize_util.c:(.text.startup+0x1e8): undefined reference to

  vp9_resize_frame420’
  collect2 : error : ld returned 1 exit status
  make[1] : * [examples/resize_util] Error 1
  make : * [.DEFAULT] Error 2

  I have libogg 1.3.1 and libvorbis 1.3.2 on my computer. (Not sure if they’re used at all.)

  I’m stumped, and I would really appreciate some guidance here.

• gstreamer h264 multicast missing SPS/PPS information

  6 mars 2015, par RBI

  I have two video streaming units capable of streaming live video inputs :

  • AXIS Q7424-R Video Encoder
  • EPIPHAN VGADVI Broadcaster 99460 -

  I am using gstreamer to view these streams on client terminals running linux. I am interested in the h264, rtp multicast streams (which both units support).

  I can stream the Epiphan video using the following gstreamer pipeline :

  gst-launch-0.10 udpsrc multicast-group=ADDRESS port=PORT caps='application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264' ! rtph264depay ! ffdec_h254 ! autovideosink

  However, this pipeline does not work for the Axis unit as I get the following error repeatedly :

  ffmpeg:0:: non-existing PPS referenced
  
  ffmpeg:0:: non-existing PPS 0 referenced
  
  ffmpeg:0:: decode_slice_header error
  
  ffmpeg:0:: no frame!
  
  ffdec_h264: decoding error (len:-1, have_data: 0)

  I have read that this error means that the ffmpeg decoder is missing the SPS/PPS information provided by a keyframe. The axis unit has a GOV parameter which is the interval at which i-frames are sent ; it is set to 32.

  Note that I can view both units’ rtp streams in unicast with the following :

  gst-launch-0.10 rtspsrc location=rtsp://ADDRESS:PORT/... latency=100 ! rtph264depay ! ffdec_h264 ! autovideosink

  Since unicast works and the unicast and multicast pipelines are the same (except for the source), my guess is either :

  • My udpsrc caps are simply incorrect for the axis stream (and I don’t really know where/how to verify it)

  • or, the axis multicast format/encoding is different and requires a modification to the pipeline (I find this unlikely since unicast is working and I don’t understand why the encoding would change between unicast/multicast).

  Any suggestions are appreciated as I am limited by my knowledge of gstreamer and media formats in terms of what to try next.

• Revision 9e7b09bc5d : SSSE3 8x8 inverse 2D-DCT with first 10 coeffs non-zero This commit enables ssse

  3 mai 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/common/x86/vp9_idct_ssse3.asm

  
  
  SSSE3 8x8 inverse 2D-DCT with first 10 coeffs non-zero

  This commit enables ssse3 assembly implementation of the 8x8
  inverse 2D-DCT with only first 10 coefficients non-zero. The
  average runtime for this unit goes down from 198 cycles to 129
  cycles (34.8% faster).

  Change-Id : Ie7fa4386f6d3a2fe0d47a2eb26fc2a6bbc592ac7