Fit 1 hour 52 min on 1 dvd

[humbleboy]

hello all
I have an mpeg2 file i hour and 58 minutes, ntsc 720x480, with 8000kbit bitrate. currently i can fit about 1 hour 45 minutes on one dvd -R disc keeping the same specifications. Is there a way to fit this video on the same disc ? what do i need?
thanks for any help

[trickyman]

Reencode at a lower bitrate. TMPGenc can do this for you...

[Nilfennasion]

MPEG-2 was designed so that the bitrate can be varied up and down to match the requirements of the video. The best thing to do would be to get a program that estimates when and where the bitrate can best be lowered, and use that to reencode the content. DVDShrink can do this with DVD-Video files in a directory on your hard drive.

[thegeeman]

If quality is an issue then keep max bitrate as the output from TMPGEnc. May be higher than what can fit on a disc but better quality. Simply drop it into DVD Shrink to fit on a single disc. But to minimise drop in quality select deep analysis and also sharp compression. Probably add another 1hr to output time.

The output from this would be better than reducing the size of the output file and thus the bitrate in TMPGEnc.

[bugster]

The output from this would be better than reducing the size of the output file and thus the bitrate in TMPGEnc.

Wrong. Encoding in TmpGenc (or any decent mpeg-2 encoder) at the correct bitrate is always preferable to encoding too high and then shrinking. Sure, if you only go slightly over size and then shrink, the loss in quality will be hardly noticeable, but if you need to shrink more than 20% or so, getting it right 1st time will be much better.

Even with deep analysis and sharp compression in DVDshrink, getting it right 1st time is better.

[trickyman]

The output from this would be better than reducing the size of the output file and thus the bitrate in TMPGEnc.

Wrong. Encoding in TmpGenc (or any decent mpeg-2 encoder) at the correct bitrate is always preferable to encoding too high and then shrinking. Sure, if you only go slightly over size and then shrink, the loss in quality will be hardly noticeable, but if you need to shrink more than 20% or so, getting it right 1st time will be much better.

Even with deep analysis and sharp compression in DVDshrink, getting it right 1st time is better.

Agreed. for BEST results I would reencode w/ TMPGenc using 2-pass VBR. But if u want a quick solution, DVD Shrink will do the job....

[mats.hogberg]

The output from this would be better than reducing the size of the output file and thus the bitrate in TMPGEnc.

Wrong. Encoding in TmpGenc (or any decent mpeg-2 encoder) at the correct bitrate is always preferable to encoding too high and then shrinking.

Of course, since reencoding a DVD to lower bitrate yields better results than transcoding the same DVD down. Only advantage of transcoding is that it's faster. If it can be avoided - it should be.

/Mats

[schematic2]

How can you get 1:45 min on a -R DvD at a bitrate of 8000? I can only squeeze 1:15 min or so...
What am I doing wrong?

[bugster]

How can you get 1:45 min on a -R DvD at a bitrate of 8000? I can only squeeze 1:15 min or so...
What am I doing wrong?

You can't. you need about 5500 to get 1h45. Of course if you use VBR you can set the MAX at 8000 and Average at 5500.

[Capmaster]

How can you get 1:45 min on a -R DvD at a bitrate of 8000? I can only squeeze 1:15 min or so...
What am I doing wrong?

What audio format are you using? LPCM?

[schematic2]

Yes, I'm using PCM. Should I be using something else to save space? What would you recommend that would still be very compatable with home DvD players?

Thanks

[yoda313]

Yes, I'm using PCM. Should I be using something else to save space? What would you recommend that would still be very compatable with home DvD players?

Thanks

Hello,

ac3 is the dvd standard compressed audio format Or mp2 - it's not 100% compatible like ac3 but it seems to be 99% compatible in my experience (my wintv pvr 250 card records in mp2 and I've never had a problem.

You can use a program like besweet to convert the audio after you strip it with tmpgenc (file - mpeg tools - demultiplex).

Kevin

[BSR]

A simpler WAV to AC3 program is ffmpeggui.
Much simpler than besweet and I do believe uses the same AC3 encoder.

[Capmaster]

Yes, I'm using PCM. Should I be using something else to save space? What would you recommend that would still be very compatable with home DvD players?

Thanks

It was already answered. Yep ..MP2 or AC3 ...the only way to go.

LPCM is an uncompressed format. You know it as .WAV in the PC world. Very inefficient, and not unusual to take up over 1GB on the disc, for just the audio, for a feature-length video

[jimmalenko]

Demux the MPEG file. Convert the WAV file to AC3 with ffmpeggui. Remux the M2V with the new AC3 file. Job's right

[Phoebos]

lame is better to use as a plug in of Tmpgenc for PAL? (mp2)

[jimmalenko]

lame is better to use as a plug in of Tmpgenc for PAL? (mp2)

I use Lame for MP3, toolame for MP2, and SSRC for resampling (all available in the tools section) - it used to be the case where TMPGEnc's inbuilt audio conversion was subpar - don't know if it's improved now, but I stick to what has worked well for me

[schematic2]

Thanks Gents
I used ffmpeggui and found it worked well.

All is good!

[jimmalenko]

Thanks Gents

I am a woman















Nah, not really

Glad it worked for you

[Nilfennasion]

Generally speaking, the longer options for MPEG-2 encodes (especially two or three-pass VBR) are the best to go with. Depending on the quality of your source, if you set your bitrate to allow lots of variation, you can fit 112 minutes fairly easily. There has been a bit of exaggeration regarding the space requirements of LPCM. 48/16 LPCM should only require about 600-700 megs of space for 112 minutes of video. Which is still quite a lot more than the 300-400 that 448 kilobit Dolby Digital requires.

Every user is different, so don't forget to experiment around a bit until you find a procedure you like.

[jimmalenko]

There has been a bit of exaggeration regarding the space requirements of LPCM. 48/16 LPCM should only require about 600-700 megs of space for 112 minutes of video. Which is still quite a lot more than the 300-400 that 448 kilobit Dolby Digital requires.

I don't think there has. Sorry to be pedantic, but by my calculations:

For 448 AC3/MP2:
112 min = 6720 s
448 Kbps = 56 KBps
6720 * 56 = 376,320 KB = 367.5 MB

For 1536 PCM:
112 min = 6720 s
1536Kbps = 192KBps
6720 * 192 = 1,290,240 KB = 1260 MB = 1.23GB

I'd say the numbers are pretty accurate

[wulf109]

I'm assuming your using VBR in TMPEG. 8000 is your maximum and does not determine how much time will fit,that's a function of the average bitrate.
TMPEG will convert directly to MP2 audio which will play on most NTSC DVD players. Mp2 audio is not part of the NTSC DVD spec,but I've never encountered a DVD player that wouldn't play MP2. MP2 files are the same size as ac3,both about 1/7th of PCM.

[Nilfennasion]

Well, I have used DVDShrink on a couple of discs with LPCM soundtracks now, and I have never encountered a soundtrack that took up more than 800MB.

Oh wait, I just checked an 89 minute music video on DVD. The LPCM soundtrack on that takes up about 999MB. My bad.

MPEG-2 actually was part of the original DVD-Video specifications. Philips lobbied to get it added to the spec, and other studios supported the action in the hope that it would make Region 1 discs more incompatible with Region 2/4 players. Where it all went wrong, of course, was that receivers that could decode MPEG 5.1 soundtracks were few and far between, and remained so until even the most ardent supporters of the format abandoned it.

[humbleboy]

ok gents i encoded my dv again to mpeg2 with bitrate 5100, 720x480 pcm audio and the file size is 4.1 gb, when import into ulead dvd moviefactory the size jumps over 5 gb and can not burn on 1 disc again.

I wonder what i am doing wrong i used a bit calculater.

the only way i could do it is encoding to 352 x 480 can fit more than 2 hours but quality is horrible i still need to keep high resolution but don't know how. shall i use dvd shrink but seems will lose quality for the whole file !!
thanks

[jimmalenko]

I'd say dvd moviefactory is trying to re-encode either the audio or the video or both. There should be a way to tell it not to re-encode DVD-compliant files.

[mats.hogberg]

I suggest using a "author only" application to author - what goes on onside these editor/author/burn/make coffee/walk the dog applications are (to me) hard to control and understand...

/Mats

[johns0]

Theres no way your file size can be 4.1 gb with 118 minute video with a bitrate of 5100 and pcm audio.Encode at 4400kbps and use 448kbps ac3 and then it will fit.

[humbleboy]

I'd say dvd moviefactory is trying to re-encode either the audio or the video or both. There should be a way to tell it not to re-encode DVD-compliant files.

this is true because ulead is encoding all mpeg2 files before buring no matter what bitrate or resolution they are, this must be the worst tool i use, if my mpeg2 is dvd compliant there should be a way to burn without encoding ! is this right ? but how?

[bugster]

I'd say dvd moviefactory is trying to re-encode either the audio or the video or both. There should be a way to tell it not to re-encode DVD-compliant files.

this is true because ulead is encoding all mpeg2 files before buring no matter what bitrate or resolution they are, this must be the worst tool i use, if my mpeg2 is dvd compliant there should be a way to burn without encoding ! is this right ? but how?

There is a button or checkbox somewhere that says 'do not convert DVD compliant files'. Find it and set it to on. If it still converts, your source files are not DVD compliant.

[Nilfennasion]

Check into turning your LPCM audio into something AC3 or even DTS compliant, too, in case you haven't already.