Displaying 20 results from an estimated 1000 matches similar to: "16 bits, cast on idct function"
2006 Jul 02
5
What goes to Hardware ?
Hi people,
As I said before: I did the IDCT to run on the FPGA.
My friends from university did the Reconstruction routines running on the FPGA.
I'm helping with the LoopFilter, and it is almost there.
(all VHDL)
I did a small profiling of the libTheora running on a Altera Stratix II device:
The processor used was the NIOS II with 8Kb of data and instruction
cache, branch prediction and
2007 May 09
2
Next step of Hardware Theora
Hello,
First of all, I would like to say that my work that I wrote in the other
email would be to do in hardware the functions: CopyRecon, LoopFilter and
UpdateUMVBorder. These are modules that Leonardo had made, but it wasn't ok
in FPGA. When I had a chat with Leonardo we were thinking in rewrite these
module for to do this running in FPGA (to debug in a Hardware level is much
more
2005 Jul 20
1
MMX IDCT for theora-exp
Hello,
I'm attaching IDCT MMX patch. I reused IDCT from theora-a3-MMXd.zip.
It should work on 64bit X86 platform too.
Here is most used functions when playing video with jet aircrafts (gripen)
Ogg logical stream 310b2968 is Theora 720x480 29.97 fps video
Encoded frame content is 720x480 with 0x0 offset
I can play this video with like 200-300 frame drops on Athlon XP 1700+
CPU load (with
2011 Mar 18
3
alghorithm of working encoder in libtheora
Hi,
Is somewhere alghorithm description of encoder process implemented in
libtheora? May be some drafts? May be frame dataflow throw encoder stages?
PLEASE
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2006 Jun 05
0
Idct - fpga - improved
Good news,
Working with synchrounous RAM (fpga internal SRAM blocks) the area
usage drop from 20% to 5% of Logic Cells.
And the clock frequency from 30 Mhz to 90 Mhz.
Now I'm improving the latency of samples (number of clock cycles
needed to decode a data sample).
Report:
--------------
Fitter Status : Successful - Mon Jun 5 16:38:21 2006
Quartus II Version : 5.1 Build 176 10/26/2005 SJ
2007 May 07
2
Theora running on FPGA
Great news! Theora is running on FPGA.
After almost a year of a great effort we have Theora validated on
FPGA. Now I will try to integrated the hardware with a video
controller to see the video!
I completely implemented the ExpandBlock, CopyRecon, LoopFilter and
UpdateUMVBorder functions.
The ReconRefFrames function was partially implemented and the part
before will run on a software compiled
2007 Sep 18
4
FOSS Codecs for Online Video: Usability, Uptake and Development - First Draft
Dear Theora/Xiph folk,
*
FOSS Codecs for Online Video: Usability, Uptake and Development - First
Draft*
A review of available tools for the creation, playback and embedding of
online video using Free and Open Source Software video codecs and a look
at the most pressing areas for development to enhance their adoption by
social change video projects on the web.
2007 Sep 18
4
FOSS Codecs for Online Video: Usability, Uptake and Development - First Draft
Dear Theora/Xiph folk,
*
FOSS Codecs for Online Video: Usability, Uptake and Development - First
Draft*
A review of available tools for the creation, playback and embedding of
online video using Free and Open Source Software video codecs and a look
at the most pressing areas for development to enhance their adoption by
social change video projects on the web.
2002 Dec 10
2
mingw compiling problem for libogg
(i hope this is correct m.list)
Hi,
there is a small compiling problem for mingw
when compiling on libogg..
in include/ogg/os_types.h :
ogg_int64_t, ogg_int32_t, etc are defined
correctly on cygwin and MSVC/Borland
but not on mingw...
i have attached a patch that will fix
this problem (i hope it attaches
correctly)
thx, Nehal
--- os_types.h.old Fri Jul 19 02:25:52 2002
+++ os_types.h Tue
2008 Mar 07
1
Bug in reference idct.
Hi
The Theora specification states, in section 7.9.3 ("The 1D Inverse DCT")
steps 14-16:
14. Assign T[5] the value T[4] - T[5].
15. Truncate T[5] to a 16-bit representation by dropping any higher-order
bits.
16. Assign T[5] the value C4 * (-T[5]) >> 16.
However, the relevant section of code in the reference decoder
(lib/dec/idct.c line 50) is:
2008 Mar 26
3
Theora logo master
Hello
I would like to ask if it's possible to display Theora logo at
http://ronja.twibright.com/sw.php
I use Theora for automatically generated videos at
http://ronja.twibright.com/3d/
If yes can I please have the master of the logo? I cannot use the small logo you have
on the website.
Thanks,
Karel Kulhavy
2006 May 31
0
Theora Decoding on FPGA
Hello people
My name is Felipe and I sent a proposal to the Google Summer of Code
that the goal is to get a FPGA embeded system decoding Theora Streams
in real-time.
It was accepted and the mentor is the Ralph Giles.
The proposal can be viewd here:
http://atlas.lsc.ic.unicamp.br/~portavales/wp-content/uploads/2006/05/soc_proposal.txt
There is also a presentation with a better division of the
2005 Feb 11
1
Changing the IDCT spec
So, in preparation for some decoder optimization work planned by Rudolf
Marek, the subject of the size of the registers needed in the IDCT
came up.
The current spec language ensures that the result is exactly compatible
with the C code for VP3. This language requires that some of the
arguments to the multiplies be 17 or 18 bits, because they need to hold
the sum or difference of two 16-bit
2008 Apr 10
2
Delay occurred when the makefile change
I have tried to add a plunging to the "libtheora-1.0beta2" (network
bandwidth measuring component was added) and Got it success for some far
now the problem is when it is added the encoding process get extremely slow
(around 20 seconds delay).
I think that the problem is with my modified Makefile (some flag may have
missed).
the following is my modified Makefile.am which is in the
2004 Aug 24
5
MMX/mmxext optimisations
quite some speed improvement indeed.
attached the updated patch to apply to svn/trunk.
j
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2007 Oct 02
3
Multi-Thread Theora Encoder
Hello,
I'm happy to announce I developed a Multi-Threaded version of the
Theora encoder. I changed the Motion Vector Search part of the
algorithm to be executed in parallel.
I've chosen the Motion search part after a careful set of profilings
that shown that the Motion Vector Search is responsible by 70% of
CPU-time on average and up to 95% of CPU-time in some cases. I also
have chosen
2005 Aug 20
0
[PATCH] remove some FZIGZAG
Hello,
As we discussed with derf some time ago, it seems it is not neccessary to enforce "forward" order of dct_coeffs.
This patch gains .99366902855226196000% so approx 1% speedup.
Meausurement method:
time nice -n -19 ./dump /mnt/disc4/theora/unix/gripen.ogg > /dev/null
Ogg logical stream 310b2968 is Theora 720x480 29.97 fps video
Encoded frame content is 720x480 with 0x0 offset
2011 Jan 22
2
ffmpeg2theora multi-threading
Is there a way to use multi-threading with ffmpeg2theora? Pretty much any
type i'm ok with, including multi-threaded theora encoding or multi-threaded
ffmpeg decoding, or using half of my cpu cores on ffmpeg decoding and the
other half on theora encoding. Is there a way to do multithreaded thoera
encoding?
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2009 Apr 13
2
academic papers that promote theora
Are there any academic papers that promote theora?
I know of one, are there more?
Universal Multimedia Access and Open Standards
<http://www.t4p.no/t4p.no/conference/media/Vaaler.pdf>
tom_a_sparks
Please avoid sending me Word or PowerPoint attachments.
but instead use OpenDocument File Formats or
use OpenOffice
http://en.wikipedia.org/wiki/OpenDocument
2008 Mar 24
2
Theora performance
Hi list,
I just came across this site:
http://web.mit.edu/xiphmont/Public/theora/demo.html
I was wondering are these issues being addressed or will be addressed before
the 1.0 release?
Theora is like the only open sourced free code people can use, i will be
nice if it performs close to other libs.
please keep up the good work!
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