On Mon, Mar 21, 2005 at 12:35:35AM +0200, Matti Haveri wrote: > >> PAL/NTSC 352x288/240 is a valid DVD resolution but I'm unsure whether > >> I should encode it as MPEG1 or MPEG2. > > > > MPEG1 > > Things were clear for a few days but now I'm confused again ;)
You've actually discovered a "cardinal" rule of sorts. "Don't trust a 1) software / 2) hardware player to prove that a 1) hardware / 2) software player will properly read and play a video". Usually, the more forgiving unit (meaning better able to interpret a somewhat not-to-spec video) is a software player. But in this case you've discovered one instance where a software player is the more picky of the two units. For the most part, if the DVD spec indicates that the resolution & format (mpeg1/mpeg2) is valid, you can presume that almost all hardware DVD players will reproduce it, provided you follow the other rules (bit rate, etc.). Beyond that, it's anyone's guess and the only way to know is to feed the video to the decoder (hardware or software) and watch what happens. And in this case, you do have two different containers, but your containers are "program stream" and "VOB". A "VOB" is almost, but not quite, a "program stream", and you've discovered a bug in your software player that does not like finding mpeg-1 format video inside of a "VOB" container. Why would this be, well one simple possible explanation is that because 99.95% of all DVD's contain mpeg-2 format video inside their "VOB" files, the programmer never tested with mpeg-1 in a "VOB" and as such, never realised that he/she didn't properly code for that particular outcome. Or maybe because 99.95% of all DVD's are mpeg-2, the programmer intentionally did not bother supporting mpeg-1 in a VOB, presuming that no one would ever notice the difference. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
