Question for Doom9 about XviD

[NeVeRLiFt]

Doom9 or anyone that can answer this...

Here is the question, the Home DVD units that support Mpeg4 that are coming out and hopefully soon to be released ;)
Will these play our encoded movies? Are will we have to use DivX-5?

I thought they where both 100% compliant.

One last question about the the Home DVD units playing our XviD encoded movies. Will they need to use certain setings, like they do for VCD/SVCD ? Will we need to do anything special that you know of to get our encodes to play?

Thank you

And thanks for anyone who takes the time to help and try to answer this! :)

[dattrax]

Sorry to butt in here, as the question was directed at doom9, but I feel 'qualified' to answer some of your questions reguarding this topic.

Certinly there are issues about an 'embedded profile' which need to be addressed, as a small device doesn't have infinite compute resource to handle a multitude of different formats. Given this as a fact you will see from the major vendors later this year, some kind of loose specifications as to what will play, and what wont play.

Here's what is looking likely, but not finalised.

bitrate upto 2.4mbits (the SVCD bitrate which is no suprise)
framesize upto D1
ASP features looking like B frames only at the moment

given these features then you shouldn't have any problems playing back your encoded content on the next set of DVD players.

As far as your XVID question goes, as long as the developers keep to the ISO syntax then you'll be OK.

Jim

[N_F]

Does anyone have a good link to some site/document that explains the development of standalone DivX players ?

[ivan_alias]

@dattrax do you know anything about the audio format? Is it aac? I can only presume you can't just burn an avi to a CD and it will play. You'll need to put it on the CD in some special way or am I wrong here?

[dattrax]

I have looked at this particular question, and I think that from a hardware vendor point of view, we need to maintain quality within a consumer device. This is not like a PC where reboots are the norm and particulally audio/video sync drifts are not an option.

The first implementation will probably be a .avi file with embedded cbr mp3 track, within the bounds of the 'embedded profile' I mentioned earlier. It will also probably decode an AAC track embedded in a MP4 system stream. (so the answer to your question is both) File system constraints are probably a ISO9660 format disk (sorry to all you mode2 people) with no more than 8 levels of directory structure.

A lot of hardware manufactures are batting the specifications around between the various interested parties, so it's just a case of watch this space.

[MaTTeR]

AAC makes perfect sense to me but MP3.. well I dunno, I've already written it off as legacy(kidding sort of).

My hope is that Vorbis audio might be given some serious consideration on the 2 channel front though. The decoder is after all finished and has been ready for hardware implmentation for quite some time. If not then it might be time for me to start some 5.1 AC3->5.1 AAC transcoding testing with Psytel.

[Nic]

It will be along time before we can/should write mp3 off....
...and as the using public, we shouldn't be encoding raw aac at all...(ivan's naughty like that ;) )

-Nic

[chemmajik]

Just make sure you get a 30day money back return policy just in case. :) the decoder is no good

[MaTTeR]

Originally posted by chemmajik
the decoder is no good

Your talking about the Vorbis decoder or AAC?

[ivan_alias]

@Nic

Hey we shouldn't be using XviD either should we? Oh.. hang on.. Its all for Educational use ;) XviD is educating me in the ways of MPEG4 encoding!

[Nic]

Very true :) But Dolby are the most protective of all the MPEG-4 affiliates..... :)

-Nic