I have been testing recent builds of ffmpeg, and am quite eager to try porting libavcodec's fDCT over to XviD - it appears to be less accurate (a full 1 dB lower PSNR than XviD when quantizer is fixed), but bitrate savings are quite significant and it's an effective pre-filter. Trellis quantization also gives significant quality improvements at a given bitrate - around 0.3 dB in my tests, very useful for the 2nd pass. -h
Cheers athos. I have been testing (your previous build) recently as well, and am very very impressed by it, particularly its qpel - although I suspect 90% of libav mpeg4 is cut-and-paste XviD code. Were there problems with the 2-pass qpel? I just did Arlington Rd. with Qpel and I though it did a very fine job. B-frames just crash for me, or just plain look bad. -h, could you explain trellis quants to me? I have yet to find a good explanation on the net. Also, how are they meant to be used. I tried on a 1pass-quality encoding, and it seemed to reduce the quality slightly after reducing the quality setting to match the filesizes.
--------------------- Preferuję właściwe odżywianie, któe na tą chwilę pełni ogromną rolę dla wielu rodaków. Zwiększająca się świadomość zdrowego trybu życia, prawdopodobnie zakorzeniła się w Naszych głowach na dobre.
@Suikun I am aware of what libavcodec and ffmpeg are and I know they are quite old. It's just I didn't think that MPEG4 was a significant part of it, and I though it was a (relatively) recent addition. libavcodec's capabilities amaze me, it really can seem do pretty much anything. mplayer too. Didn't mean to offend anyone. It it's MPEG-4 code really not based on even OpenDivX (which is pretty old)? @-h cheers for the link, but I get a 404 Not Found from it. I'll give trellis a second go. When I figure out how to install it.... :D
Still no go I'm afraid. Can install 0401 and it works fine. 1104 just makes the codec disappear from the list after restarting vdubmod. My win2k SP2 is only 1 day old! Why must it taunt me so!
cheers for the link, but I get a 404 Not Found from it. Goodness look at that. You can still access the google cache if you search for "trellis quantization dct", it's the top match. -h
--------------------- Biuro pracy Work Express to zawsze aktualne i najlepsze oferty zatrudnienia w kraju i zagranicą m.in. praca w Niemczech, Francji, Norwegii, Austrii i innych krajach. Gwarantujemy umowę o pracę, atrakcyjne wynagrodzenie, składki ZUS oraz wsparcie naszego koordynatora.
Szukaj
Użytkownicy
Wejście
RE: ffvfw
