From: John Joyce <dangerwillrobinsondanger@...>
Date: 2007-10-04T00:27:43+09:00
Subject: Re: RVideo - Ruby video transcoding library


On Oct 3, 2007, at 9:38 AM, Jon Dahl wrote:

> Ilmari Heikkinen wrote:
>>
>> One API idea:
>> RVideo.transcode("filename.mp4", "filename.avi",
>>   :resolution => [640,480],
>>   :video_codec => 'xvid',
>>   :audio_codec => 'mp3')
>>
>
> Thanks for the suggestion. I'd like to do something like that at some
> point, but I'm not exactly sure how.
>
> I spent quite a bit of time thinking about the best way to define a
> command. The problem is that ffmpeg is extremely complex, and a good
> quality transcoding job often involves more than just resolution,  
> codec,
> format, etc. There are literally hundreds of other options that can be
> set that control quality, file size, a/v sync, etc. So I didn't  
> want to
> reduce the power of ffmpeg by controlling the options too much.
>
> So I decided for now to just do the simplest thing possible and  
> pass in
> a command with variable interpolation. This allows you to store  
> recipes
> on your system (in your database, in a yaml config file, etc.), and to
> pass in whatever variables you want.
>
> For now, you can certainly build your own RVideo recipe constructor,
> which does exactly what you're describing. It should just output a
> string, and then pass that string to a RVideo::Transcoder object.
> -- 
> Posted via http://www.ruby-forum.com/.
>
Check VLC (video lan client) it's open source and they use ffmpeg.  
You might find some ideas in there.