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help with tmpgenc re encoding

 
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Spiet



Joined: 04 May 2004
Posts: 4

PostPosted: Tue 4 May 2004, 14:31    Post subject: help with tmpgenc re encoding Reply with quote

howdie

first post here and i have a pretty annoying problem here, perhaps any of you can help me out.

well i have an avi file

details : 512x288 (1.78:1) [=16:9] divx 3 low motion, 731 kb/S, 23.97 fps, and with 128 kbit mp3 44100hz.

now what i want to do is convert this file to mpeg2 with tmpgenc and then run it through tmpgenc dvd author to create menu etc.
i have read alot of the compression options , and hq options etc but i do not manage to keep, when re encoding the file to 16:9 format.
i does work tho but the video type and source is so confusing (it works but then the screen on the widescreen tv is too small (even when its in 16:9)

g-spot says this info above so the file is in 16:9. i did a few other files (avi also) with tmpgenc , mostly in 4:3 but then i used custom size (660x440), worked pretty good.

i did get some weird color and distortion images when viewing the file on the dvd player , i have no idea what went wrong, it does happen a few times but like 1 second.

so main question, when using the wizard of tmpgenc , what do i need to check and uncheck to get that file in the best quality, converting to mpeg2 and that the tv will convert it to 16:9.

thanks.
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RMN
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Joined: 04 Feb 2003
Posts: 587
Location: Lisboa, Portugal

PostPosted: Tue 4 May 2004, 22:03    Post subject: Reply with quote

I wouldn't recommend using the Wizard at all. It does not give you full control over the options. Are you trying to encode to PAL or NTSC?

RMN
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Spiet



Joined: 04 May 2004
Posts: 4

PostPosted: Wed 5 May 2004, 12:47    Post subject: Reply with quote

To ntsc since it is 23.97 fps

dvd standalone player and tv can handle the signal so its not a problem. i'm only very confused about the video type and display settings in tmpgenc with this file (and pretty with all files)
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RMN
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Joined: 04 Feb 2003
Posts: 587
Location: Lisboa, Portugal

PostPosted: Wed 5 May 2004, 13:10    Post subject: Reply with quote

Set the source aspect ratio to "1:1 VGA". Set the output aspect ratio to "16:9 display". Set the video arrange method to "full screen" (without "keep aspect ratio"). That should do the trick; it will stretch the image to 720x480 and set the 16:9 flag so the player knows how to display it.

RMN
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Spiet



Joined: 04 May 2004
Posts: 4

PostPosted: Wed 5 May 2004, 13:18    Post subject: Reply with quote

Ok thnx alot

i'll try these settings.

btw does that also mean that the video will be reencoded with better quality etc ?

i want setting that will encode the divx video to as best as possible.
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Spiet



Joined: 04 May 2004
Posts: 4

PostPosted: Wed 5 May 2004, 14:15    Post subject: Reply with quote

BTW another question i got

lets say u got a divx file which is in 750 kbit

is it necessary then to select for example in tmpgenc 8000 kbit for video bit rate? i mean will that make a difference ?

so if u for example just use 2000 or 4000 instead of 8000 , the file will be smaller (more place on the dvd for other things), but what about the quality? Will it be the same , 2000-4000 compare to 8000 since the original source is only divx at 750?
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RMN
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Joined: 04 Feb 2003
Posts: 587
Location: Lisboa, Portugal

PostPosted: Wed 5 May 2004, 15:16    Post subject: Reply with quote

DivX and DVD use different encoding algorithms, so there is no relationship between the bitrate of one and the bitrate of the other. Generally, DVD will need a higher bitrate to produce equivalent quality, since it uses an older, less efficient algorithm, but you'll have to make a few tests to determine the best settings for each case.

Recompressing video (ex., from DivX to MPEG-2) will nearly always introduce a loss of quality, even if you use a very high bitrate.

The best way to see DivX movies on the TV with good quality is to use a graphics card with TV-out. That way you don't need to convert the video, and you can use your PC to decode (PC decoders normally have better quality than set-top decoders).

RMN
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