How good is the video compression in vp3.2? For example, how does it compare (bit rate & quality) to mpeg1, mpeg2, Divx, real Video 8+, Windows Media, etc. etc. It being open source is nice and all, but if it can't be reasonably competitive then there isn't much point to it. I just haven't seen anything that compares vp32 to anything else. (Although to be honest, I haven't seen much on honest comparisons of the other formats, either.) <p><p><p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'theora-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
If you do not know the difference between the format results you need to do some comparison tests then. I have a DV 8 minute piece that I convert with most new codecs it shows up all sorts of artifacting from video compression. This file is About 1.4Gb. I converted it to MPEG 2 and it made a file that was full PAL format and about 270 MB in size. I converted it to MPEG1 at QCIF or a quarter of the frame resolution and the result was afile about 80Mb in size I converted it to Quicktime using Sorensen and got a file about twice this size 160MB at the same frame size as the MPEG 1 I then ran the MPEG 1 through VP3 and got a file of 17MB all of these used an audio of MPEG3 at 128k I used the Lame MP3 encoder and Video Studio Pro 6 to make the files Quality wise there was little difference between the MPEG 1 and the VP3 footage So you ask what is the point. Small file size high quality video footage that can be played back on PC and MAC By adjusting the parameters of the codec it is possible to get high quality streaming footage that will play over broadband As to Reals Helix or Windows Media 9 or Divx 5.02 they all show far more artifacting and have larger file sizes than VP3 Hope this helps ----- Original Message ----- From: "Freun Laven" <FreunLaven@earthlink.net> To: <theora@xiph.org> Sent: Tuesday, November 12, 2002 4:03 PM Subject: [theora] Quality of vp3.2 codec? <p>> How good is the video compression in vp3.2?> > For example, how does it compare (bit rate & quality) to mpeg1, mpeg2, > Divx, real Video 8+, Windows Media, etc. etc. > > It being open source is nice and all, but if it can't be reasonably > competitive then there isn't much point to it. > > I just haven't seen anything that compares vp32 to anything else. > (Although to be honest, I haven't seen much on honest comparisons of the > other formats, either.) > > > > > --- >8 ---- > List archives: http://www.xiph.org/archives/ > Ogg project homepage: http://www.xiph.org/ogg/ > To unsubscribe from this list, send a message to 'theora-request@xiph.org' > containing only the word 'unsubscribe' in the body. No subject is needed. > Unsubscribe messages sent to the list will be ignored/filtered. >--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'theora-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
Bitrate and quality are fairly closely related... when you compare codecs, you have to look at them together. When I think of codecs, I generally separate them into different "eras" Within an "era" codecs generally have a similar quality:size ratio, and similar playback requirements. Between eras, the quality:size difference becomes much much more significant. I consider MPEG1 and MPEG2 to be in an era together with Sorenson 2, and perhaps Indeo 5 (I have not tested indeo 5 very much). VP3 lies together with divx, WM9, MPEG-4, Zygovideo etc... anyway, to cut a long story short, I consider them to be largely equivalent in quality:size to those other codecs. As to specific performance, I have been using VP3 for about 2 years. I spend a lot of time testing out different codecs. I generally re-encode DVDs, and try to fit them onto a CD. (Note: about 90% of the DVDs that I rip I own. I end rip each DVD about 4-10 times, testing out different codecs and settings... I am more interested in playing around with codecs than with copying movies)... I use the quicktime component, and it doesn't have the flexibility that it could.... for example, you can't encode at a constant quality... it is only quasi-CBR, so the quality of Theora should be better... anyway, in my experience, VP3 can reproduce low action scenes with amazingly high quality, at very low bitrates (I consider 50-60KB/s to be low bitrates for 640x272). Where VP3 does fall down, however, is with scenes with fairly high action. VP3 does not give enough data to the scenes with high action, so it gets very blocky very quickly (it produces 8x8 blocks of solid colour).. even so, most codecs have trouble with high action scenes, and, for the most part, it is not too bad. Generally, I prefer VP3 to pretty much every other codec that is widely available, except in certain high motion scenes. Blibbler On Tuesday, November 12, 2002, at 01:03 PM, Freun Laven wrote:> How good is the video compression in vp3.2? > > For example, how does it compare (bit rate & quality) to mpeg1, mpeg2, > Divx, real Video 8+, Windows Media, etc. etc. > > It being open source is nice and all, but if it can't be reasonably > competitive then there isn't much point to it. > > I just haven't seen anything that compares vp32 to anything else. > (Although to be honest, I haven't seen much on honest comparisons of > the > other formats, either.) > > > > > --- >8 ---- > List archives: http://www.xiph.org/archives/ > Ogg project homepage: http://www.xiph.org/ogg/ > To unsubscribe from this list, send a message to > 'theora-request@xiph.org' > containing only the word 'unsubscribe' in the body. No subject is > needed. > Unsubscribe messages sent to the list will be ignored/filtered. >--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'theora-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.