Is there Any open source, fast H263 decoder library for ARM9 than ffmpeg?
I've ported the Telenor H.263 decoder to ARM9. It seemed to run fine. Telenor doesn't distribute it any more, but the files here look like what I used.
may be x263 from Xirlink?
http://freshmeat.net/projects/helixplayer
http://freshmeat.net/projects/mediastreamer
http://sourceforge.net/projects/h263/
http://sourceforge.net/projects/mpeg4dec/
If any suits you say it!
Related
I am starting a project to test the audio performance on linux.
What I need to do is to play the audio on our websystem and check the audio quality (or just check it has audio output) on linux.
I am going to record the audio on linux with ffmpeg. Is there any other better choice?
I don't know how to (automation) check I recorded is what I played, as well as the quality of recorded audio.
I think what you need is PESQ (Perceptual Evaluation of Sound Quality). However I have not found anything which is open source/free and out of the box.
You can download the recommendation from here:
http://www.itu.int/rec/T-REC-P.862-200511-I!Amd2/en
Basically this is the reference implementation of PESQ.
Sevana has an audio quality analyser which is not an ITU standard, it is AQuA:
http://www.sevana.fi/aqua_wiki.php
It is available for linux but I think you have to pay for it.
You can also check the similarities for two audio files with cross-correlation, please refer to here:
https://dsp.stackexchange.com/questions/736/how-do-i-implement-cross-correlation-to-prove-two-audio-files-are-similar
I just learned that lot of people are using Matlab or Octave to generate the necessary data, for example:
http://bagustris.blogspot.ie/2011/11/calculate-time-lag-from-cross.html
I have a multi-platform application written in Free Pascal. This application plays a short sound on some event. On Windows, I can do this by MMSystem and sndPlaySound('sound.wav'). However, I don't know how to do this on Linux without external libraries.
I have a solution to play it with SDL and OpenAL, but I don't want any dependency on these libraries to play one short sound. Does there exist a Linux command line player that exists on most distros by default? The file format doesn't matter; I will convert it.
mplayer is command line and graphical. You can start it on tty and pty.
You could try aplay, but that has a dependency on ALSA. Maybe sox?
The program mplayer - "the movie player" gives you the option to use a graphical user interface or to use the console. So i would imagine it has a solution to your problem.
Are you looking to BEEP, BLEEP and BOOP and BOP ( and low frequency fart) ? Use sox. If youre looking to play a file: use sox or SDL.
You need a for looped array to get a sort-of piano effect, like a song. Its ugly, messy, and cant be tweaked much like the ole PC speaker, but its passable.
Beep is probably want you want, tho. Install the package, put one on your motherboard(YEAH...no hookup? use sox), and enable the pcspkr module. (On ubuntu its blacklisted by default.) If BEEP produces nothing, try sox.
At least youll have something. Yes, you can check for loaded modules and installed packages. I believe Ive done both.
How to play sound in lua? Is there any simple trick how to do it?
My goal is to play some ogg (or mp3) files during playing my game, which is programmed in lua. It's running on windows.
Lua does not have any built-in sound APIs. As you are on Windows, you have these options:
Write bindings for a sound system of choice (OpenAL or something more high-level — as a separate non-Lua-specific question if you need help picking one).
Use LuaJIT2 FFI to directly access DLL functions of the sound system of choice.
Otherwise, if you do not use LuaJIT2, use Alien FFI library.
Or, indeed, use LuaCOM to play some sound (with DirectSound?), if you're familiar with COM stuff.
Lua doesn't have any native sound APIs. If there is a plugin/extension for Lua to accomplish audio control/playback, you'd have to go dig that up seperately. Or if Lua supports COM, you could speak to the Windows audio facilities directly.
proteaAudio is a pretty easy library for lua to play audio or even generate audio on the fly.
You can use the Corona library:
--Loads the selected audio (make sure the name is the same as the .wav file)
local audio1 = audio.loadSound( "audio1.wav" )
--Plays the audio on any available channel (theres up to 32 channels)
local audio1Channel = audio.play( audio1 )
source: http://docs.coronalabs.com/api/library/audio/play.html
In windows, use luacom
require('luacom').CreateObject("wmplayer.ocx").URL="my.mp3"--Need to keep host process alive, not to close.
I undertaking a personal project which involves the development of a system which will automatically generate audio thumbnail clips (about 30 seconds in length) from a full length track.
In order to do this I want to look at the energy and pitch of the audio to try and correctly identify its major structural features.
Is there any open source software available that can do energy/pitch extraction? If not I will start looking into alternative methods using MATLAB.
Thanks!
YAAFE (Yet Another Audio Feature Extractor) http://yaafe.sourceforge.net/ does audio feature extraction in MATLAB, Python and C.
You might want to look into the Echo Nest API. It has a lot of audio analysis capabilities, and I know there's a script bundled in the Remix package that can automagically turn songs into shorter or longer versions (I believe the script is called earworm).
Audacity may do it.
Try JAudio which can extract features from an audio.
MARSYAS contains bextract for analysis, can find MFCCs and various other timbral and spectral features. http://marsyas.info/
Is there a freely available library to create a MPEG (or any other simple video format) out of an image sequence ?
It must run on Linux too, and ideally have Python bindings.
I know there's mencoder (part of the mplayer project), and ffmpeg, which both can do this.
ffmpeg is a great (open source) program for building all kinds of video, and converting one type of video (a sequence of images in this case) into other types of video.
Usually it is utilized from the command line, but that is really just a wrapper around its internal libraries. It is expressly available to be used from within another program.
There are also python bindings that wrap the c api, though this particular project doesn't seem to be getting the best support (there are probably other projects out there doing the same thing).
There's also this link where someone has used ffmpeg to do something similar to what you're looking for.
GStreamer is a popular choice. It's a full multimedia framework much like DirectShow or QuickTime, has the advantage of having legally licensed codecs available, and has excellent Python bindings.
in c++ OpenCV (open source Computer Vision library from Intel) let you create an AVI file and just push frames inside...
but it's like shooting with a cannon to a fly.
Not a library, but mplayer has the ability to encode JPEG sequences to any kind of format. It runs on Linux, Windows, BSD and other platforms and you can write a python script if you want to use it with python.
ffmpeg has an API and also python bindings, seems to be the way to go !
Thanks
ffmpeg minimal runnable C example
I have provided a full runnable example at: How to resize a picture using ffmpeg's sws_scale()?