HDTV (MPEG-2 TS) to XviD help?

[trueimage]

I have been searching for an easy way to convert my TS caps to Xvid for weeks. Are there any up to date guides? The ones I find seem old, and they don't explain things, like:

starting with a 1080i video

crop(4,4,-4,-8)
resize to 960x528

well doesnt that takes the AR from 1.77 to 1.81 ? I don't get why they chose that numver. Another I've seen is 960x544. The 960 is obvious, but the 528 and 544 are not.

Right now here is what I have (very little)

1. Womble to cut out the parts i dont need in the TS
2. open new TS in DGIndex, Save and demux video
3. Still on AVISynth scripts... help?

I'm running out of space for all these TS files, I need to get some of this compressed ;)

Thanks!

[sysKin]

Why do you need any special guides, just pick any resolution you like best.
1680x944 is what I'm choosing right now, simply because my future monitor is going to be viewsonic 2025 :)
1280x720 makes perfect sense too.

Don't forget to IVTC/deinterlace if source is indeed 1080i without pulldown.

[edit]960*9/16 is 540. The closest mod16 is definitely 544, so I wouldn't say it's not obvious.

[trueimage]

Deinterlacing a 1080i I thought gave a 960x540 size because you are only keeping 1/2 the frames to get a progressive image.

the main issue is figuring out how much to crop and what to resize to as a general rule?

[trueimage]

Also, is it reasonable to compress 1080i TS with AC3 2.0 to 2GB XviD, after resizing, if it is roughly 100 minutes in length? I want to store 2 XviDs per DVD-R.

[shpitz]

Deinterlacing a 1080i I thought gave a 960x540 size because you are only keeping 1/2 the frames to get a progressive image.

the main issue is figuring out how much to crop and what to resize to as a general rule?

it's only 1/2 of the vertical res not the horizontal as well, so 1/2 a frame is 1920x540.

[APC2006]

starting with a 1080i video

crop(4,4,-4,-8)
resize to 960x528

well doesnt that takes the AR from 1.77 to 1.81 ? I don't get why they chose that numver. Another I've seen is 960x544. The 960 is obvious, but the 528 and 544 are not.


I usually use GK to encode because I'd like to do compressibility test, and this is how I usually crop and resize:

For 1080i (or 1088i)
crop(8,0,1904,1078)
LanczosResize(960,544)

GK shows the cropping and resizing above gives 0.1% aspect error.
The reason I remove not 8 but 10 lines on the bottom is that the 2 lines above the grey bar sometimes appear to be disturbed.
You could simply remove the grey bar (8 lines) from the bottom and 8 from each of left and right, that gives -0.1% aspect error.

For 720p
crop(8,0,1264,716)
LanczosResize(960,544)

GK shows the cropping and resizing above gives 0.0% aspect error.
I usually remove 4 lines from the bottom (and 8 fom each of left and right) because of black area.


Also, is it reasonable to compress 1080i TS with AC3 2.0 to 2GB XviD, after resizing, if it is roughly 100 minutes in length? I want to store 2 XviDs per DVD-R.


I think it is reasonable if you IVTC and resize to 960x544.
I haven't done any movies from 1080i but several of them from 720p (on ABC). For example, "Remember the Titans" (about 122 min) I encoded last month is about 2.18 GB with about 70 % of compressibility although the sound is in mp3.
In addition, I've encoded lots of 1 hr TV dramas from 1080i and 720p. Each episode is usually around 42-44 min w/o commercials, and the file size is usually around 700MB to 900 MB with about 70% compressibility (though the sound is mp3).