Possible to have 2 different resolutions in one MPEG 2 file?

[j1d10t]

Is it possible to have 2 different resolutions in an MPEG 2 file? Like, if I have a TV show that I have in one resolution (704x480), then to save space can I encode the credits in a lower resolution (352x480), with a lower bit rate, then multiplex them together in to one file? Is that possible? This would be for an XSVCD.

Thanks

[txpharoah]

No.

[j1d10t]

So I would have to have it as a separate track, huh? Maybe just set that file to play right after the first track that has the show...

[hotwings]

So I would have to have it as a separate track, huh? Maybe just set that file to play right after the first track that has the show...

I believe you've answered your own question, this should be relatively simple on a good dvd authoring program (I am assuming you're trying to make a dvd).

[j1d10t]

No, I'm making an XSVCD. I was just hoping to avoid that slight jump when it switchs tracks. Oh well

Thanks.

[Donny661]

what you can do is encode your credits separately at a lower bitrate, but the same resolution and that could save you some space. you could also encode your credits at "half" the framerate. go into tmpg and the settingd. select the framerate settings and change the box in the middle to 2. you will have the same framerate it will duplicate every other frame. so, in essence, you will have half the frames and it will look better at a 704x480 and a lower bitrate.

[j1d10t]

donny661:
So you mean use the 14.985 fps setting? The end credits are pictures of the show with the credit text over it, so it's not like it's really moving much. Do I need to add any pulldown, or anything like that? Will that work for XSVCD, to have the frame rate at 14.985 (internally 29.97fps)?

[Donny661]

Any decoder will think it is 29.97fps so you don't need to add any pulldown or anything like that, and you should be able to join it with the rest of your show with tmpg's mpeg tools.

[j1d10t]

Cool! One more question; the source is interlaced. Do I need to de-interlace it, or set the encoding to non-interlaced?

[Donny661]

I think it can stay interlaced, but i'm not sure. I can't think of a reason why it would need to be de-interlaced. give it a try and see if it works .

[j1d10t]

I tried encoding the credits at 14.985fps, and it looks great. The still images with the credits overlaid looks excellent. The 20th Century Fox logo at the end of the credits looks a little choppy, but I don't really care about that. And encoding them at 14.985fps let me use half the bitrate that I had been using, so that is letting me up the bitrate for the rest of the video a little. I didn't have to de-interlace, or encode as non-interlaced - it might have helped the 20th Century Fox logo not look so choppy if I had de-interlaced, but as I said, I really don't care about that part. Now after I encode the rest of the video, can I then multiplex the credits on to the end of the main video, even though they are different frame rates (kind of)? Since the video will be encoded at 29.97fps, and the credits are 14.985 (internally 29.97fps), can they be multiplexed together? Or should I just stick with the 2 files, and just set the credits to play right after the video? Thanks for all your help, I really appreciate it

[Ejoc]

no you dont multiplex em.

just add both mpeg's to your XSVCD, put the movie first then the credits.

[Donny661]

use the merge part of tmpg's mpeg tools to make your movie and credits one file. it should work.

[SaSi]

I didn't have to de-interlace, or encode as non-interlaced - it might have helped the 20th Century Fox logo not look so choppy if I had de-interlaced, but as I said, I really don't care about that part

When the source video is interlaced, you will do well to leave it alone as interlaced. However, you must tell the encoder to encode in interlaced mode, otherwise the resulting video stream will have a strong comb effect and "choppiness".

[j1d10t]

Yeah, I let TMPGEnc encode as interlaced. The motion still looked a little choppy, but since it was just the 20th Century Fox logo, I really didn't care. I went ahead and merged the two files together, and they look great. Thanks everyone for your help