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We are almost ready to start the encoding process. We'll cover the final details.
Resize & Crop
DVDs are sized at 720x480, which is 1:1.5 ratio. The standard is that 8 pixels from left & right borders should be cropped, (however, this value varies, so just crop the black part on the sides) and that it be resized to NTSC
ratio (1:1 1/3) for playback. Some common ones are shown on the table below. I
generally try to keep the full source resolution of 640xXXX.
| Resolution |
Pixels |
Bitrate |
| 320x240 |
76800 |
430 |
| 352x240 (VCD)* |
88480 |
500 |
| 352x264 |
92928 |
510 |
| 384x288 |
110592 |
620 |
| 416x312 |
129792 |
725 |
| 448x336 |
148736 |
825 |
| 480x360 |
172800 |
950 |
| 512x384 |
196608 |
1100 |
| 544x408 |
221952 |
1200 |
| 480x480 (SVCD)* |
230400 |
1250 |
| 576x432 |
248832 |
1350 |
| 608x456 |
277248 |
1500 |
| 640x480 |
307200 |
1650 |
* Not 1:1 1/3 ratio.
For movies with ratio other than 1:1 1/3, you should crop the black borders after the resize by adding null transform and doing crop on that.
Use Precise Bilinear or Precise Bicubic. Bilinear help in increasing compression efficiency by causing minor blur, while Bicubic will retain sharp details. I always use Bicubic.
Set range
After you've checked and tested your settings, set the range that you want to encode using the starting/ending mark tool in VirtualDub. Here's a tip: if you turn off the Display Output option, you can move around the movie much quicker to set the marker by bypassing the processing of filters for preview.
If you set the starting position to other than the first frame and use DVobSub, you'll need to split the vobsub files to offset for the delay. This also saves space by chopping off parts that you don't need. VobSub comes with splitter utility that you can launch like this:
RUNDLL32.EXE vobsub.dll,Cutter
Tip: Create a shortcut with above as the Target, and Start In set to the directory with vobsub.dll.
Once launched, you should see this:
Click Open and load the vobsub files you created initially. The 4 text boxes in each row corresponds to hours, minutes, seconds, and mili seconds. You can find out what you need to put in from VirtualDub. Do Edit -> Go to Selection Start (or Selection End), and then do Edit -> Go to.. You should see something like this:
24:34.711
This means you should put in 0, 24, 34, and 711. After you set both start and end, do Save As. You'll now end up with 3 new files required to use with DVobSub or VobSub.
Start Encode - Nandub_OnePass
First go to Video->SBC Options->Bitrate Calculator and set the bitrate as
needed. Then do File->Save as AVI.
Start Encode - Nandub
First go to Video->SBC Options->Bitrate Calculator and set the bitrate as
needed. Then do File->First Pass, and then File->Second Pass.
Start Encode - VirtualDub with Divx, Xvid, etc.
Go to Video->Compression. Select and configure the codec as needed. Then do
File->Save as AVI.
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