Encoding using TMPGENCgreenspun.com : LUSENET : Video CD : One Thread
I captured video from my Camcorder in .AVI file format and used TMPGENC to encode it to mpeg for VCD. I used VCD - NTSC - CQ-VBR Bit Rate and this made the file so large that a 10 minute video recording occupied 385MB in the VCD Mpeg format. The quality was so good but the size is too large , it normally would occupy around 175MB if COnstant BitRate is maintained but when objects are moving you will see flashes
Anyone help me please identify what i can do to get the size smaller
-- Iyappan (email@example.com), January 01, 2001
What was the resolution of your movie? Did you reduce it to 352x240 ?
-- Thumper Strauss (firstname.lastname@example.org), January 01, 2001.
Yes the resolution of the movie was 352x240 NTSC If i do the same with having the Bit Rate Control to 2 pass then the size is normal
-- Iyappan (email@example.com), January 02, 2001.
VCD is supposed to be CBR and not VBR. Constant Bit Rate versus Variable Bit Rate. Yes, you can do none standard VCD using VBR as well, but at the expense of filesize. You can't get quality without sacrificing disk space. This is a fact in mpeg1 encoding. Normally a 10 minutes clip will be 100Mb in size. When you encode it with VBR, the encoder automatically assigns data rate higher then normal VCD data rate (1150Kbps) to the high motion scenes(where things moving very fast and no flashes). This will cause that particular part of the movie to have more data stored = bigger file size. This is why your result is good and the file size is bigger then you have expected. Now, when you are using VBR for encoding, the max value needs to stay below 4000Kbps.
-- lnguyen (firstname.lastname@example.org), January 03, 2001.