Oded Shimon <ods15@ods15.dyndns.org> writes:
On Sat, Jun 24, 2006 at 02:20:26PM +0100, Måns Rullgård wrote:
Rich Felker <dalias@aerifal.cx> writes:
On Sat, Jun 24, 2006 at 01:27:24PM +0200, Michael Niedermayer wrote:
so IMHO a id system must be able to achive the following, if it doesnt then IMHO its not worth considering 1. streamcopy (without decoder) every valid non broken stream from avi,mov,ogg to nut and produce a valid and playable file
this is inherently impossible due to missing pts. you must have a decoder (or at least a parser) to streamcopy from avi.
I consider pts != dts in avi broken.
OK, but B frames in mpeg PS files is not broken (at least according to ISO...), yet still needs a decoder/parser to figure out pts for every frame :)
You can get useful information from MPEG PS/TS without a decoder, but you get nothing whatsoever from AVI. MPEG PS/TS requires a frame to have either no timestamp at all (in which case they can be calculated by the decoder), only a PTS (which requires PTS == DTS), or both PTS and DTS (which may differ). With AVI you know nothing at all, which is what makes it troublesome. -- Måns Rullgård mru@inprovide.com