---------------------------------------- > Date: Tue, 15 Apr 2008 11:23:26 -0400 > From: [EMAIL PROTECTED] > To: [email protected] > Subject: Re: [libav-user] quality of encoding > > Jasper Leemans a écrit : >> Hi all, >> >> I`m encoding raw frames to an mpeg1 stream and I`m just wondering, >> is there a way to raise the quality, for example through the codec context >> >> c->quality = ... >> >> or lower the compression ratio. >> >> I can`t find anything similar in the c example code. >> >> wkr, >> >> Jasper >> _________________________________________________________________ >> Invite your mail contacts to join your friends list with Windows Live >> Spaces. It's easy! >> http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx&mkt=en-us >> _______________________________________________ >> libav-user mailing list >> [email protected] >> https://lists.mplayerhq.hu/mailman/listinfo/libav-user >> > Hi > The first thing you should check is the bitrate. I think that by default > it's 200 kb/s. By increasing the bitrate you will for sure increase the > quality. > The compression ratio, by decreasing the gop you will add more key > frames and therefore have better quality there too. > > I would like to have feedback on this.
I decreased the gop from 10 to 1, I also changed the bitrate from 400kbit to 1000kbit, I notice these things: 1) when looking at the mpeg file info the bitrate went from 2600kbit to 3000kbit/s, so setting the bitrate with c->bitrate seems to have no real effect for me, as I seem to have no real control over it, it ignores the bitrate I set. 2) the file got bigger but I see no noticeable visual improvement. > > > JF > _______________________________________________ > libav-user mailing list > [email protected] > https://lists.mplayerhq.hu/mailman/listinfo/libav-user _________________________________________________________________ Explore the seven wonders of the world http://search.msn.com/results.aspx?q=7+wonders+world&mkt=en-US&form=QBRE _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
