User:Juhovh

Google Summer of Code 2010 student 
[http://juho.vähä-herttua.fi/ Personal website] 
[http://wiki.videolan.org/SoC_2010_Shader_Support GSoC2010 project page]

SoC 2010 projects

2010-05-05T20:39:04Z

Juhovh: /* Shader support for video post-processing */

Here is a list of the accepted projects for Google Summer of Code 2O10.

= List of current VLC projects =
==Shader support for video post-processing==

* '''Project page: [[SoC 2010 Shader Support]]'''
* '''Student''': [[User:Skoruga|Sasha Koruga]]
* '''Mentor''': Adrien Maglo
* '''Abstract''':

A lot of video post-processing such as RGB-YUV conversion can be accelerated by using the GPU. This can either be achieved through a fragment shader, where it is the last step before a pixel is displayed on the screen, or it can be done with DirectCompute/CUDA/OpenCL. The method will vary depending on the task and intent. I will implement support for shaders by using the DirectX and OpenGL API and write a few shaders such as RGB-YUV conversion.

* '''Project page: [[SoC 2010 ASF Demuxer]]'''
* '''Student''': [[User:juhovh|Juho Vähä-Herttua]]
* '''Mentor''': Ilkka Ollakka
* '''Abstract''':

I was selected to do a project related to ASF and Matroska demuxers, but since there's some overlap related to Matroska, my main goal now is to improve the ASF demuxer as much as I can and then find another similar project to work on the rest of the time.

= List of current x264 projects =

= List of current VLMC projects =
==Enhancing VLMC==

* '''Project page: [[SoC 2010/Youtube Integration VLMC|SoC 2010/Youtube Integration in VLMC]]'''
* '''Student''': [[User:Rohityadav|Rohit Yadav]]
* '''Mentor''': Ludovic 'etix' Fauvet
* '''Abstract''':

Youtube is the most popular video sharing website, right now. VLMC is a video editing software and having features in VLMC to search-retrieve videos, directly upload/update/delete videos on Youtube, within the application itself, would be awesome. The aim of this project is to write a small C++/Qt based Youtube client library for VLMC that provides her all the APIs to perform all those things.

= List of current Phonon projects =
== PCM I/O API ==

* '''Project page''': [[SoC 2010/PCM IO API (Phonon)]]
* '''Student''': [[User:Mforney|Michael Forney]]
* '''Mentor''': Jean-Baptiste Kempf
* '''Abstract''':

Design a fully featured PCM I/O API for Phonon, and provide an implementation for the Phonon-VLC backend and one other (either MPlayer or Xine). This API will allow developers to capture PCM data from devices like a sound card, or to play back raw audio from memory, or elsewhere. This will provide some important missing features in Phonon, and open the door for many applications waiting to make use of an API like this.

[[Category:SoC_2010_Project]][[Category:SoC]]

SoC 2010 ASF Demuxer

2010-05-05T20:36:38Z

Juhovh: Created page with '{{SoCProject|year=2010|student=Juho Vähä-Herttua|mentor=Ilkka Ollakka}} =ASF and other demuxer support= ==Abstract== I was selected to do a project relate…'

VLC GPU Decoding

2010-04-25T21:51:04Z

Juhovh: Add a link to the new API

= Introduction to GPU decoding in VLC =

The {{VLC}} framework can use your '''''graphic card''''' (aka GPU) to decode H.264 streams (wrongly called HD videos) under certain circumstances.

VLC, in its '''modular''' approach and its transcoding/streaming capabilities, does decoding in GPU at the '''decoding stage only''' and then gets the data back to go to the other stages (streaming, filtering or plug any video output after that).

What that means is that, compared to some other implementation, GPU decoding in VLC can be slower because it needs to get the ''data back from the GPU''. But you can plug '''ANY''' video output (sink) to it and use '''all '''the VLC video filters.

=== Windows ===
VLC 1.1 supports [http://en.wikipedia.org/wiki/DirectX_Video_Acceleration DxVA] in its version '''2.0'''. That means that ''Windows Vista'', ''Windows 2008'' or ''Windows 7'' are '''required'''. If you are using ''Windows XP'', VLC cannot work for you yet.

=== Linux ===

On Linux, there is code for VDPAU and VAAPI. There is also some code for a VAAPI video output, that isn't merged in the current Git.

Read [[VLC_VAAPI]] and [thresh's blog|http://strangestone.livejournal.com/107092.html] for more details.

=== Mac OS X ===
Mac OS X (X.6.3) provides a [http://developer.apple.com/mac/library/technotes/tn2010/tn2267.html new API] for decoding in GPU. This isn't working yet with VLC. Help is welcome.

= Requirements for Windows DxVA2 in VLC =

To check your DxVA compatibility, please '''download [http://bluesky23.hp.infoseek.co.jp/en/index.html#DXVAChecker DxVA Checker]'''

== Graphic card ==
VLC developers recommend to use nVidia cards so far to have the best performance.

=== nVidia ===

For nVidia GPU, you are required to use a GPU supporting [http://en.wikipedia.org/wiki/Nvidia_PureVideo PureVideo] in its 2nd generation (VP2 or newer), which means that you need a [http://en.wikipedia.org/wiki/GeForce_8_Series GeForce 8], [http://en.wikipedia.org/wiki/GeForce_9_Series GeForce 9] (advised), [http://en.wikipedia.org/wiki/GeForce_200_Series GeForce 200] or newer.

To be sure, check your GPU against this table on [http://en.wikipedia.org/wiki/Nvidia_PureVideo#Table_of_PureVideo_.28HD.29_GPUs wikipedia] and check if you are VP2 or newer.

=== ATI ===

For ATI GPUs, it is a bit trickier.

First, you are required to use a GPU supporting [http://en.wikipedia.org/wiki/Unified_Video_Decoder Unified Video Decoder].

We believe you need a [http://en.wikipedia.org/wiki/Unified_Video_Decoder#UVD_enabled_GPUs GPU supporting UVD+], but you might require a UVD2 compatible GPU. We don't have the hardware to test so far. We have tested against ''Radeon 4K'' so far.

Then, ATI cards seems to be very slow to get the data back from the GPU. So far, it seems that you need a SSE4.1 compatible CPU to decode, in order to use MOVNTDQA instruction. This may change in the future!

=== Intel ===

We haven't tested any Intel implementation so far.