Bitrate?

[frankusho]

I have about 3 hours worth of movies, and I want to fit them onto a dvd+r. What would you say is the lowest bitrate I should encode them with in TMPGEnc 3.0 Xpress? I'm currently trying to encode them each at a constant bitrate of 4000 kbits/sec, and I know I can go lower, but I don't know how much bitrate I should encode them with to fit them all on one dvd+r and still have a good/average quality.

[Cole]

I am not sure if it is the same for TEMPGEnc3, but on 2.5. when you encode them with TEMPGEnc using the wizard, there is a percentage guide and selecting the DVD as the destination, you should be able to get an idea of what bit rate for any particular film will fit onto how much of the DVD.

For example, if each film is one hour long, then aim at making each film about 30-32% of the total DVD. The bit rate will be calculated for you.

Hope that this helps.

[frankusho]

Thanks, but thats not what I want to know. I want to know the lowest you can go for the bitrate to still get a good quality.

[Baldrick]

read https://www.videohelp.com/forum/viewtopic.php?t=245249&highlight=352x480

and please post converting in our converting forum. moving you.

[jimmalenko]

Thanks, but thats not what I want to know. I want to know the lowest you can go for the bitrate to still get a good quality.

How long is that piece of string ??????

There's no "magical formula" to work this out. It depends on the type of footage, the quality of the source, and the encoder settings, but to name a few. The time you wish to put on 1 DVD determines the bitrate you must use. The bitrate you need to use determines the resolution you should use.

3 hours on 1 DVD needs a video bitrate of about 3150kbps with 224kbps audio, and no menus. If you want menus you need to reduce this to about 3000kbps or so.

Cole had a very similar question to this, and this is what I posted in reply:

Given a perfect (DVD quality 720 * 480/576) source, I use the following:

(where ave is the calculated video bitrate)

If ave is < 1000kbps, I'd use 352 * 240/288 2-Pass VBR (min 100 ave ave max 2000)
If ave is > 1000kbps & < 2000kbps, I'd use 352 * 240/288 ave CBR
If ave is > 2000kbps & < 5000, I'd use 352 * 480/576 2-Pass VBR (min 1000 ave ave max 5000)
If ave is > 5000kbps & < 7500, I'd use 720 * 480/576 2-Pass VBR (min 1000 ave ave max 9000)
If ave is > 7500kbps, I'd use 720 * 480/576 ave CBR

[frankusho]

THANK YOU, but would that be with 720 x 480 or 352 x 480.

[jimmalenko]

3 hours on 1 DVD needs a video bitrate of about 3150kbps with 224kbps audio, and no menus. If you want menus you need to reduce this to about 3000kbps or so.

Given a perfect (DVD quality 720 * 480/576) source, I use the following:

(where ave is the calculated video bitrate)

If ave is < 1000kbps, I'd use 352 * 240/288 2-Pass VBR (min 100 ave ave max 2000)
If ave is > 1000kbps & < 2000kbps, I'd use 352 * 240/288 ave CBR
If ave is > 2000kbps & < 5000, I'd use 352 * 480/576 2-Pass VBR (min 1000 ave ave max 5000)
If ave is > 5000kbps & < 7500, I'd use 720 * 480/576 2-Pass VBR (min 1000 ave ave max 9000)
If ave is > 7500kbps, I'd use 720 * 480/576 ave CBR

Calculated bitrate is about 3000kbps, so use 352 x 480.