Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread stefan
Jonathan Woithe schrieb: > The very noticeable degradation comes about due to a bug in libdv which is > used to do the encoding to DV from cinelerra. When I last looked into this > about 2 years ago ffmpeg's DV codec wasn't as badly affected but it still > wasn't great. hmm, great? Great would be

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread Steven M. Schultz
On Thu, 23 Nov 2006, Richard Rasker wrote: > question I have deals with one of the elusive Holy Grails of video > processing: how to render a given DV file into the highest possible > quality DVD. In addition to being a holy grail it is also known as a 'wild goose chase' ;)

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread Roman Shaposhnik
On Fri, 2006-11-24 at 09:02 +1030, Jonathan Woithe wrote: > > Unfortunately, Cinelerra doesn't allow for CLI driven rendering other > > than the rather inflexible batch render functions, and I though I found > > that rendering an edited project first to DV, then rendering the DV file > > to MPEG, g

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread Roman Shaposhnik
On Fri, 2006-11-24 at 09:33 +0100, stefan wrote: > Jonathan Woithe schrieb: > > The very noticeable degradation comes about due to a bug in libdv which is > > used to do the encoding to DV from cinelerra. When I last looked into this > > about 2 years ago ffmpeg's DV codec wasn't as badly affected

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread Roman Shaposhnik
On Thu, 2006-11-23 at 12:16 +0100, Richard Rasker wrote: > It would be nice if there was a tool to calculate which values for bit > rate and quantization would still result in a valid DVD MPEG file, based > on a given DV file, without actually having to go through the lengthy > rendering process it

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread stefan
Roman Shaposhnik schrieb: >> hmm, great? Great would be something which allows for reencoding 10 >> times and is still hard to see... >> > > I guess I find it a bit hard to parse this particular statement. Are > you referring to a particular degradation of a quality you've observed > or is

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread Richard Rasker
Op vr, 24-11-2006 te 00:26 -0800, schreef Steven M. Schultz: > > On Thu, 23 Nov 2006, Richard Rasker wrote: > > > question I have deals with one of the elusive Holy Grails of video > > processing: how to render a given DV file into the highest possible > > quality DVD. > > In addition to b

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread stefan
Here some other stress-tests: http://people.freenet.de/mb1svcd/DV/small_comparison_of_dv_codices.htm http://www.slashcam.de/artikel/Grundlagen/Der-Canopus---Unterschied.html (german) cu Stefan - Take Surveys. Earn Cash. Inf

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread Roman Shaposhnik
Hi On Fri, 2006-11-24 at 11:19 +0100, stefan wrote: > Yes, I do refer to massive quality-loss I have observed in such an > "encoder-stress-test". I can, if you wish, do this test again. That'll be *very* much appreciated (if not the tests themselves, then just a complete recipe for reproducin

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread Linetec
Op vr, 24-11-2006 te 00:26 -0800, schreef Steven M. Schultz: > > On Thu, 23 Nov 2006, Richard Rasker wrote: > > > question I have deals with one of the elusive Holy Grails of video > > processing: how to render a given DV file into the highest possible > > quality DVD. > > In addition to b

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread Dan Maas
Hi guys - I've some done work on ffmpeg's DV codec recently, on contract for some of my clients. Quality-wise, the video encoder should be competitive with popular commerical encoders. In some of my benchmarks it attains higher image quality than Apple's software encoder. Which is not to say it is

Re: [Mjpeg-users] DV analyzer tool / optimizing video rendering?

2006-11-24 Thread Steven M. Schultz
On Fri, 24 Nov 2006, Linetec wrote: > Hmm, then how do you call it when quantization (-q) is chosen too low, > resulting in mplex reporting buffer underrun errors? "bit rate too high". ;) I know I've "lectured" on this before but maybe newer/different wording w