480 X 480Resolution Question

[sherman]

I know that this is standanrd SVCD resolution, but it is 1:1 resolution and TV's are 1.33. So would the video at this resolution be distorted in some way when viewed on TV.

I am experimenting with various MPEG 1 resolution.
Standard VCD is two blurry for me.
XVCD 702X480 is sharper but there is block noise at 2500 bitrate which is the highest my DVD player can handle (Apex AD-700).

Would 480 X 480 be better at bitrate 2500.

Sherman
sbalsom@nf.sympatico.ca

[vhelp]

sherman,

I'm no expert, but the specs for SVCD is:
* 480x480
* 2520k bitrate
* 225 or 192** for audio
...anything else is an xSVCD

But, try it this way.
* 352x480 - the 480 gives it much sharper*** picture on TV.
* you may be able to correct some of loss in sharpness w/ a "sharp"
filter or tmpg's "sharpen endge" filter. I do this with all my xSVCD
encodes at 352x480, and looks great on my TV.

-vhelp

** cause I see this in other documentations on SVCD specs.

*** as for sharpness on TV viewing. I belive (could be wrong) that
the interlace (if you source is interlace) once it's de-interlaced, will
cause it to blur. If you enocode with interlace in tacked, and play
on your TV, you'll noticed that it pretty much retained it's sharpness,
but you'll have the jittery/studder movements during play on your TV.


<font size=-1>[ This Message was edited by: vhelp on 2002-01-13 19:20:39 ]</font>

[kinneera]

Just for information's sake, I believe the 192Kbps is the maximum supported for mono sound. The range of supported audio bitrates for SVCD is something like 96-384, but some standalones seem to have trouble with anything other than 224.

@sherman: for MPEG1, if the output aspect ratio is specified to be "4:3 (525 line)" for NTSC or "4:3 (625 line)" for PAL, it should be fullscreen on your TV. Should being the operative keyword of course, as some DVD players choose not to honor that MPEG header information (it is non-standard after all). And yes, 480x480, or 352x480 will be less blocky at the same bitrate.

[rcbax]

480x480 is automatically stretched for your TV screen and I notice no loss in resolution.

I record at 2200 CBR for my DVD711. If I go much higher, it skips. Also, I noticed that I don't get any perceived quality difference higher than 2200 for SVCD anyway.

[Vejita-sama]

Ok, first your confusing resolution with display aspect ratio (DAR). Take a look at:

http://www.doom9.org/aspectratios.htm

for more info. Popular DARs include 1:1 (PC), 4:3 (TV) and 16:9 (film). However, it's possible (in theory) to have these DARs at ANY resolution.

[sherman]

Ok guys. I tried encoding a 702x480 capture (satilite broadcast of 5 minutes clip of a hocky game with lots of motion to test the bitrate) to 480 x 480 MPEG1 with bitrate of 2500.

Result good pitcure quality and not blockness but the pitchure was shown on my DVD player with black borders top and bottom and the pitchure was streached making people shorter and fatter.

What did I so wrong.

Sherman

[sudsbrewer]

Make sure your source aspect ratio is set to 4:3. If you are using TMPGENC click on Settings and go to the Advanced tab. Make sure the aspect is not set to 1:1. I know that is the default on my setup.

Suds

<font size=-1>[ This Message was edited by: sudsbrewer on 2002-01-16 17:20:52 ]</font>

[Vejita-sama]

How did you encode it? If using TMPGenc

Load template
Choose input source, and name output file
Click on settings, then click on the advance tab
Under Video arrange method choose "full screen <keep aspect ratio> and for TV type choose "4:3 525line NTSC"

[sherman]

I took your suggestions and tried it agian with the following settings in TMPGEnc.

Source avi is 702X 480 with MJPG compression.

Video Source - Interlaced
Source Aspec Ratio 4:3 525 NTSC
Video Arange - Full Screen Keep Aspec Ratio
Video Stream - MPEG1
Sixe 480 x 480
Aspec Ratio - 4:3 525 NTSC

I got the same results. Output wide screen on my DVD player with image streached and people shorter and fater.

Befor I pull my hair out someone tell me what I'm doing wrong

Sherman

[kinneera]

I suspected that would happen. I think what Vejita-sama said is correct, except you want to select the "Full Screen"-only option (not the preserve aspect ratio option).

[NedDorsey]

I saved the Source Aspect Ratio of 4:3 525 NTSC as a motified template in TMPGEnc, but every time I start a new project and load my motified template the Source Aspect Ratio is back at 1:1 VGA...
Make sure it's at 4:3 right before you start encoding.

[House de Kris]

I don't know if this is the issue or not, but I was under the impression that MPEGs that are to be played back on a DVD player should have resolutions as multiples of 16. In which case 702x480 won't do it. 704x480 does match the multiple of 16 rule. Give that a try and see if it is squished/stretched again.

[sherman]

Kinneera your right I tried full screen (not keep aspect ratio) and it worked perfectly thanks.

House de Kris 702x480 was a typo. I ment to say that my orignal avi was in 704x480.

I got one other question. What setting does most peoplee use for Motion Search Precision.

Sherman 8)

[zzyzzx]

The encoded MPEG file should look funny on your computer screen when played with something like Windows Media Player but OK on the TV screen.

[sherman]

Thats exactly what happened zzyzzy and thats what I hoped for becaus I was mainly concerned with how it looked on TV with my DVD Player.

I have had great success converting my avi's to MPEG1 480 X480 VBR bitrate (min 1100 ave 1800 max 2500).

I Burn to CDR with VCD Easy & CDRWIN. The resulting XVCD look great on my Apex DVD Player.

This is my best comprimise between MPEG file size and video quality.

Thanks for all the help guys.

Sherman :P

[sherman]

Thats exactly what happened zzyzzy and thats what I hoped for becaus I was mainly concerned with how it looked on TV with my DVD Player.

I have had great success converting my avi's to MPEG1 480 X480 VBR bitrate (min 1100 ave 1800 max 2500).

I Burn to CDR with VCD Easy & CDRWIN. The resulting XVCD look great on my Apex DVD Player.

This is my best comprimise between MPEG file size and video quality.

Thanks for all the help guys.

Sherman :P