TmpGenc settings

[chobo321321]

I have some avi files that I want to encode to mpeg-2, but I'm kinda confused with which resolution, and frame rate I should use. Up until now I have been using a resolution of 720X480, and a framerate of 29.97. The reason I ask is because the AVI files are 640X360, with a framerate of 23.97.

Should I change the settings to match the AVI files, or should I continue using the other settings? Would there be a difference in quality between the two settings? I ask this because I've noticed some of the encodes seem a bit cropped, and sometimes the motion is a bit jerky.

Any help is appreciated.

[DRP]

I have some avi files that I want to encode to mpeg-2, but I'm kinda confused with which resolution, and frame rate I should use.

What is your intended result? Do you want to make SVCD (you have a CD-writer drive) or do you want to make a DVD (you have a DVD writer drive)?

Up until now I have been using a resolution of 720X480, and a framerate of 29.97. The reason I ask is because the AVI files are 640X360, with a framerate of 23.97.

I'll assume you're talking about making DVD compliant files for the time being. You're also obviously talking NTSC which is fine. I'm more experienced with SVCD creation but the same principals should apply I would think. Firstly, if you think the picture quality you've been getting so far is pretty good, then I'd just suggest you go back down to a 704x480 resolution instead of 720x480. 704 is also a DVD compliant resolution and is closer to the original 640 dimension so the resize is not quite so large resulting in slightly higher picture quality. There is no need for you to encode at 29.97fps. you are just creating more frames (which your eyes/brain can't see) over which the limited number of bits you have, get spread more thinly. Better to encode at the 23.976 bitrate of the AVI and get tell your DVD player to do the telecine up to 29.97fps on the fly in realtime as it gets played. Your DVD player is more than capable of doing this without you noticing any difference at all, though the picture quality will be higher because the bits are being better utilised to paint fewer frames.

Should I change the settings to match the AVI files, or should I continue using the other settings?

You can't change the resolution settings to match the AVI if you still want it to play in a DVD player. I am assuming of course that this is your intended purpose because you haven't said. If you are wanting to create an MPEG-2 file for some other purpose than playing via DVD player, then please stop reading now.

The resolution you choose is dictated by the SVCD/DVD standards. You must stick to these resolutions otherwise the DVD player won't recognise the file you ask it to read and it'll just say the disc is incompatible with the player. For the NTSC file you are talking about, the valid resolutions are 352x240, 352x480, 704x480 & 720x480. If you don't make it one of those resolutions at least, then it likely won't play it at all. You may also find that hybrid resolutions like 704x240 & 720x240 *may* also play but I can't imagine you wanting to use those.

I ask this because I've noticed some of the encodes seem a bit cropped, and sometimes the motion is a bit jerky.

The jerky motion you describe is symptomatic of an NTSC -> PAL conversion taking place by the DVD player software in realtime. Are you sure you have a NTSC outputting DVD player and an NTSC TV set? If you don't then an NTSC -> PAL conversion might be happening somewhere as you watch it and then jerky motion is normal because of the duplicated frame being created every second to make up for the difference between 23.976 (24fps) and 25fps difference of the two systems.

[johns0]

The jerky motions are caused by encoding 23.976 fps to 29.97,encode at 23.976 using 2:3 pulldown if you use tmpgenc.You can read here what pulldown is.

[chobo321321]

Thanks for the help guys. Ya the jerky motion was caused by not using 3:2 pull down, and changing the frame rate from 23.97 -> 29.97. These are anime encodes which are considered film, and should be encoded at 23.97 frames.

The resolution setting still confuses me. I'm not how to go about figuring out which resolution to use, and which ones are valid. The encode I downloaded seems to be widescreen (640x360). How would I figure out the DVD resolution for this?

I re-read the above post that stated there are 4 DVD resolutions, and a few hybrid ones. So are those aspect ration calculators only for people who are doing VCD/SVCD encoding? Seems kinda confusing, so many SVCD guides not enough DVD ones

[DRP]

Thanks for the help guys. Ya the jerky motion was caused by not using 3:2 pull down, and changing the frame rate from 23.97 -> 29.97. These are anime encodes which are considered film, and should be encoded at 23.97 frames.

The resolution setting still confuses me. I'm not how to go about figuring out which resolution to use, and which ones are valid. The encode I downloaded seems to be widescreen (640x360). How would I figure out the DVD resolution for this?

I re-read the above post that stated there are 4 DVD resolutions, and a few hybrid ones. So are those aspect ration calculators only for people who are doing VCD/SVCD encoding? Seems kinda confusing, so many SVCD guides not enough DVD ones

Click on the link in the top left corner of this website called WHAT IS DVD

https://www.videohelp.com/dvd

It tells you everything you wanna know

[ZippyP.]

Rule of thumb: Pick a resolution close to your source without upsizing, or upsize as little as possible.