On Friday 08 November 2002 17:27, Diego Zuccato wrote:
[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
Chris Phillips wrote:
But TFM says just "-vop scale" without parameters... Is -1:-2 the default?
TFM says: scale[=w:h[:c[:p]]] Scales the image with the software scaler (slow) and performs a YUV<->RGB colorspace conversion (see -sws option too). The value 0 is used for scaled (aspect) destination w/h. (default: original w/h, destination w/h with -zoom) Optionaly chroma skipping (c from 0-3) and scaling parameters can be specified. (see the -sws option for details)
so all this stupidly long drawn out and sidetracked thread was started when you'd not even bothered to try an option you already knew about, and is even called "scale"???
I haven't access to that machine from here. And I read about scale only after encoding the movie. More, TFM cited it relative to VCDs, not DVDs. More again, WHY IN THE HELL should one think about using a scale option if NO SCALING is desired ??? I followed the (IMO) most logical path: I want a 3-CD rip (for really hi-quality) of the DVD. I don't want to mess the video part too much, and the "native" resolution is good for me (if you scale to anything that's not an integer divisor of the source you lose more quality - then I keep the source resolution). So I use the minimum number of options, better if taken from someone that already used 'em.
If ignoring aspect header when encoding from mpeg (but NOT when playing) is a feature, it's a really strange one. I'd call it bug if it wasn't (at least partially) documented...
No its not a bug, its totally normal. It is because avi is not able to store AR , so if we had a better container , we could forget all these stuff. What I did not understand is why you bother about scaling and loosing quality trough that and in the same time you try to recompress video. Recompressing mpeg2 -> mpeg4 will let you lose a lot of information (thats the reason you do it I guess), so it is not the question how to not losin information, more it is the question on how to loose them , so it is not noticable as much as you could. Downscaling is a good method for that, since it could be easily restored by upscaling without much quality loss. Compressionartefacts will suck a lot more. I think this thread is very informative, but I don't know if this is the right forum for it. If someone can give an advice for where doing such discussions I would love to do it there ;o) Greets Steffen