Rockbox Development > Feature Ideas
Here's an idea! ISO Video Support
gevaerts:
--- Quote from: qtipextra on August 23, 2008, 01:03:48 PM ---Yeah, another good point. Almost all DVD video files are split into multiple files so you would not have to worry about the 4 GB size limit. So really all we would need is the AC3 audio and DVD video (.VOB) support.
--- End quote ---
dvd video is easy. That's plain mpeg2 which we support. The main issue will be scaling
Llorean:
If I understand, our AC3 isn't the fastest codec on the block either. So we're decoding 4.5 times the number of pixels we normally do and decoding a slower audio codec. So performance is definitely going to be a significant question as well.
Chronon:
It's not covered in the CodecPerformanceComparison and SoundCodecs claims that it works "very efficiently". Do you have some idea of how fast it is compared with some of our other, better tested codecs?
Llorean:
No, that's why I said "If I understand." I'm just going off the impression I got from talking with amiconn earlier. But I expect that just getting DVD-resolution MPEG-2 playing realtime is going to be a considerable hurdle. We have approximately twice the speed of the Gigabeat F and we need four times the pixels plus scaling. Not to mention many DVDs have multichannel AC3 (5.1 surround) which, even if AC3 is as efficient as MP3, means we have to deal with quit a bit more data.
saratoga:
The S's CPU is tremendously faster per clock then the F's, and it does have a coprocessor that can probably handle the scaling without bothering the main CPU. Its certainly possible to do this, but a lot of work.
Adding scaling to mpegplayer would be a great first step.
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