Support and General Use > Plugins/Viewers

MPEG playback problems

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Delta009:
youtube videos are in the FLV format (flash video)
the specs of FLV videos can be found there : http://blogs.chron.com/makingmovies/archives/2006/04/youtube_and_the.html

i made comparisons between mpeg and flv because the videos on youtube have a relatively low audio bitrate (64k) and it's in mono, so you don't need to set a higher audio bitrate for the output file if your original video is ripped from youtube

further, the videos on youtube are scaled to 320x240... which is the same size than the screen of an ipod !

even if the video bitrate on youtube is 200 kbps, we must set a higher bitrate than that for the output file, or else, because it would have been poorly converted twice, it would become very ugly

N.B..: i'm talking here about the standard videos we find on youtube. however, youtube plans to start a high-def service http://gizmodo.com/gadgets/clips/what-youtubehd-might-look-like-328366.php, which is in beta testing. also, some popular videos have a higher audio bitrate than the others.

astro2:
are you guys saying that ipod cpu isn't just crap when playing gameboy games but media files useless even with a mpeg viewer unless we rip the media ourselves and encode it suitable to rockbox??

Delta009:
the problem doesn't come from rockbox
it comes from the mpeg-4 decoding chip inside the ipod video

at the moment, rockbox can't access that chip to decode at reasonable speed mpeg-4 video
and, on old ipods such as the ipod photo and nano, this chip doesn't even exist

so, the firmware has to rely only on the ipod's cpu and ram to decode low quality and lagging mpeg-2 video

rockbox developers are doing the best they can
if you don't like it, you may develop your own mpeg-4 plugin if you wish (rockbox is open source)

EDIT: And, btw, I don't think that the main purpose of a customized ipod is to play gameboy games... especially when there are only 6 buttons on the mp3 player to control the 4 directions of the d-pad, the a and b buttons and select and start.

Chronon:

--- Quote from: astro2 on October 02, 2008, 09:21:40 AM ---are you guys saying that ipod cpu isn't just crap when playing gameboy games but media files useless even with a mpeg viewer unless we rip the media ourselves and encode it suitable to rockbox??

--- End quote ---

I'm having some difficulty parsing that.  Punctuation helps readability a lot.

The bottom line is that every device needs media in a compatible format or it's unplayable.  This is as true for a Rockboxed device as it is for any other.

Part of the discussion upthread had to do with issues transcoding from FLV to MPEG.  This doesn't have anything intrinsic to do with Rockbox, only with how transcoding from one lossy format to another works.

Hopefully this addresses some of what you were asking, though I'm not totally sure what you were commenting about.

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