This is 2009, back in 2001 or so, there used to be no good bindings for sound playback in ruby.
Has there been a change? I am looking for something to control playback of either raw sound or mp3, ogg and flac. My Googling has turned up dry.
Edit: Linux, OSX and if possible Windows.
You don't mention a platform. This page describes the win32-sound library, which seems to support at least WAV playback.
For a more platform-neutral way, Ruby/SDL provides bindings for the ever-popular SDL library.
Related
So, assuming we got a distribution without proprietary codecs installed.
Let's take Linux Mint for example. I want to store and playback wav and ogg format sounds, either by using my own software, or by using another developer's software. So far so good right?
Imagine now that we have the following scenario. For some reason, I wanna playback a file that is either an mp4 or mp3 or mpeg or any other format, made by proprietary codecs. Instantly, I will need a codec for these formats.
I read somewhere that Fluendo sells solutions for "legal codec usage" for linux distros.
URL of fluendo: http://www.fluendo.com/en/
So here comes the questions:
Using VLC and ffmpeg is enough for me to convert a file to an ogg or ogv so I can playback a song or a video using an open format. You can also playback playback files made by proprietary formats. But are VLC and ffmpeg legal to use, to playback such files made by proprietary codecs? For example, ss VLC codecs okay to be used without paying anyone for mp4 playback? Is it okay to convert a file from mp4 to ogv?
If not, are there any legal and open source and free (as in freedom) codecs around that can solve the issue, or does someone have to pay a product, to be ethically correct, to the developers of the proprietaty codecs?
Note that I do not ask for Windows, since codec licenses are included to the price of the operating system. I ask exclusively for a free linux distribution.
Since #LordNeckbeard pointed me to the FAQ of FFmpeg, that I really can't believe I missed, it became clear to me that there is a problem in using proprietary codecs, thus there are some file formats that could be avoided to keep ourselves safe. Otherwise if someone can afford a license to use them too, that would be perfectly fine.
So mp3, mp4, mpeg and some more patented formats are to be avoided, if not licensed.
ffmpeg can be built so it can exclude support for such formats and if you need to use sound or video to your software ogg and ogv are nice and efficient formats as we all know.
Digging a little deeper Ι found that too.
https://www.fsf.org/resources/playogg_radiostation.pdf
I need to export an MP4 file containing several streams of audio. There is no video at all at this point in time, though this might be requested sometimes in the future.
All this is on the Mac running a decently recent version of Mac OS X. QT Kit is not an option. Portability to iOS would be a bonus.
Where should I look? A very casual look at AV Foundation suggests this might be a way, but doesn't look simple at all.
Or should I rather look for a third party library? ffmpeg? mp4v2?
Thanks for any suggestion.
This question arises out of a combination of this being my first time working with video and unfamiliarity with Macs. Basically I'm finding it difficult to figure out how to play a video (within a QWidget, or otherwise) using any standard format, e.g. avi, mpeg, mov, etc. In particular,
QMovie::supportedFormats() gives me only .gif and .mng, but I need to use standard formats. Is there a way to increase the number of supported formats?
Phonon requires the presence of a 'backend' which the user has to implement himself. I looked to see if I could somehow do this with Quicktime, but I couldn't get the application to launch--and anyway I didn't really see how to do that. Also, Phonon looks pretty heavyweight, I'd like to avoid it if I could.
While there are plenty of avi (et al.) players floating around on the web, I think it's probably unlikely I'd be able to use them--I need to start, stop, and change the playback speed of videos programmatically i.e. through my C++ program.
I'm not sure why this should be so hard--working with images in Qt is a snap by comparison. So: What's a good way to play videos from within a C++/Qt program?
Stop what you are doing right now: Phonon is the past, Qt Mobility is the future.
After you download, compile and install Qt Mobility, check the examples: videowidget and videographicsitem, located at: qt-mobility-opensource-src-1.2.0/examples/
They pretty much answer all your questions.
Anyone know of a vorbis decoder library that can be used on Windows Phone 7?
The lack of native code interop make re-using any of the native code implementations difficult (impossible?) but if there are tricks to do that, I'm open to that as well.
There is a managed implementation for mono called csvorbis, it includes a sample which outputs a wav file this didn't need many changes to work with XNA's SoundEffect class. I did a whole track at once, this took a few seconds in the emulator so you may need to stream it using DynamicSoundEffect for better results. The mooncodecs folder has a codec for the desktop version based on csvorbis which may be worth a look aswell.
Ogg Vorbis is not a supported codec on Windows Phone 7 and the platform supports no way of adding support for custom codecs.
The options available are to write your own decoder/converter in managed code or to convert the original source files.
I suspect the second option will be easier.
I saw, in an application from a major software vendor a dll called "DivXDecoder.dll" - which intrigued me as (a) it implies the existence of an easy to use divx library, and (b) I'd rather like to play divx compressed movies in a product I work on.
The DivX project itself seems to concentrate on making Codecs and tools for end users. Are there any C/C++ friendly projects that make playback of divx content in Win32 or Cocoa apps possible?
Look at mplayer sources - it uses the ffmpeg library that handles decoding from a number of formats.
DivX is a compressor that conforms to MPEG-4 Part 2. XviD and some versions of Windows Media are also implementations of the standard. So anything that can decompress MPEG-4 Part 2 should be able to handle things compressed with DivX.
As for actual decompression libraries, I'd recommend libavcodec. It's widely-used (= good support), cross-platform, and open-source (LGPL, so can be used in commercial apps). It's also fairly easy to use from it's C binding. It can open and play many different codecs (and with libavformat, handle many different wrappers i.e. avi, mkv, etc.).
If it's Windows-only, using the OS-provided Video For Windows might be a better option if you just want to play MPEG since you wouldn't need to ship it with your app and you avoid potential license issues. Be warned, though, that this requires the user to have certain codecs installed. On Win7 (and Vista I think) the MPEG codecs required to play DivX/XviD are installed by default, however they're not on XP...
Don't waste your time trying to implement DivX playback in a Cocoa application. Use QTKit. If someone wants to playback DivX content in your app they will install a DivX QuickTime plug-in.