Recherche avancée

Sur d’autres sites (3634)

• SNAP : Simulation and Neuroscience Application Platform [closed]

  19 avril 2024, par S_S

  Is there any documentation/help manual on how to use SNAP (Simulation and Neuroscience Application Platform)1.

  



  I wanted to run the Motor Imagery sample scenario with a .avi file for the stimulus instead of the image. How can that be done ?

  



  The following error is obtained when using the AlphaCalibration scenario which gives code to play an avi file.Any help appreciated

  



  :movies:ffmpeg(warning): parser not found for codec indeo4, packets or times may be invalid.
:movies:ffmpeg(warning): max_analyze_duration 5000000 reached at 5000000
:movies(error): Could not open /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:audio(error): Cannot open file: /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:audio(error): Could not open audio /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:movies:ffmpeg(warning): parser not found for codec indeo4, packets or times may be invalid.
:movies:ffmpeg(warning): max_analyze_duration 5000000 reached at 5000000
:movies(error): Could not open /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:gobj(error): Texture "/e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi" exists but cannot be read.
Traceback (most recent call last):
  File "E:\BCI_Feb2014\SNAP-master\src\framework\latentmodule.py", line 458, in _run_wrap
    self.run()
  File "modules\BCI\AlphaCalibration.py", line 30, in run
Exception during run():
    m = self.movie(self.moviefile, block=False, scale=[0.7,0.4],aspect=1.125,contentoffset=[0,0],volume=0.3,timeoffset=self.begintime+t*self.awake_duration,looping=True)
Could not load texture: bird.avi
  File "E:\BCI_Feb2014\SNAP-master\src\framework\basicstimuli.py", line 348, in movie
    tex = self._engine.base.loader.loadTexture(filename)
  File "E:\BCI_Feb2014\Panda3D-1.8.0\direct\showbase\Loader.py", line 554, in loadTexture
    raise IOError, message
IOError: Could not load texture: bird.avi


  


• movenc : Use packets in interleaving queues for the duration at the end of fragments

  20 avril 2016, par Martin Storsjö

  movenc : Use packets in interleaving queues for the duration at the end of fragments
  As long as caller only writes packets using av_interleaved_write_frame
  
  with no manual flushing, this should allow us to always have accurate
  
  durations at the end of fragments, since there should be at least
  
  one queued packet in each stream (except for the stream where the
  
  current packet is being written, but if the muxer itself does the
  
  cutting of fragments, it also has info about the next packet for that
  
  stream).
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/avformat.h
  • [DBH] libavformat/internal.h
  • [DBH] libavformat/movenc.c
  • [DBH] libavformat/movenc.h
  • [DBH] libavformat/mux.c
  • [DBH] libavformat/version.h

• lavc/h263dsp : R-V V {h,v}_loop_filter

  19 mai 2024, par Rémi Denis-Courmont

  lavc/h263dsp : R-V V h,v_loop_filter
  Since the horizontal and vertical filters are identical except for a
  
  transposition, this uses a common subprocedure with an ad-hoc ABI.
  
  To preserve return-address stack prediction, a link register has to be
  
  used (c.f. the "Control Transfer Instructions" from the
  
  RISC-V ISA Manual). The alternate/temporary link register T0 is used
  
  here, so that the normal RA is preserved (something Arm cannot do !).
  To load the strength value based on `qscale`, the shortest possible
  
  and PIC-compatible sequence is used : AUIPC ; ADD ; LBU. The classic
  
  LLA ; ADD ; LBU sequence would add one more instruction since LLA is a
  
  convenience alias for AUIPC ; ADDI. To ensure that this trick works,
  
  relocation relaxation is disabled.
  To implement the two signed divisions by a power of two toward zero :
  
   (x / (1 << SHIFT))
  
  the code relies on the small range of integers involved, computing :
  
   (x + (x >> (16 - SHIFT))) >> SHIFT
  
  rather than the more general :
  
   (x + ((x >> (16 - 1)) & ((1 << SHIFT) - 1))) >> SHIFT
  
  Thus one ANDI instruction is avoided.
  T-Head C908 :
  
  h263dsp.h_loop_filter_c :       228.2
  
  h263dsp.h_loop_filter_rvv_i32 : 144.0
  
  h263dsp.v_loop_filter_c :       242.7
  
  h263dsp.v_loop_filter_rvv_i32 : 114.0
  
  (C is probably worse in real use due to less predictible branches.)
  

  • [DH] libavcodec/h263dsp.c
  • [DH] libavcodec/h263dsp.h
  • [DH] libavcodec/riscv/Makefile
  • [DH] libavcodec/riscv/h263dsp_init.c
  • [DH] libavcodec/riscv/h263dsp_rvv.S