Why does XVID avi file balloon in size when converting to mpeg2 or dvd?

[im2020]

I use TMPGEnc 4.0 Xpress for capture and TMGEnc DVD Author 2 for creating dvds.

I have an avi file 58 minutes long, size 703MB, which GSpot describes as DivX Style "packed bitstream" AVI; OpenDML (AVI v2.0); XviD 1.0.3; 672x512.

If I capture it with TMPGEnc and format/encode as DVD standard, PAL, 4:3, 720x576, 25 fps I get a 3940MB mpg file.

If I capture it with TMPGEnc and format/encode as mpeg2 PAL, 4:3, 720x576, 25 fps I get a 1735MB mpg file.

I'm sort of expecting/wanting something between 1000MB and 1400MB.

Any thoughts/ideas on what I'm doing wrong or what I might be misunderstanding?

Thanks in advance for your help.

Ian

[filmboss80]

Apples and oranges. Xvid uses a different compression scheme (MPEG-4) than MPEG-2. And your differences between DVD standard MPEG-2 and your other MPEG-2 file are simply a matter of bitrate settings. The bigger-sized file will be better qualtity.

[im2020]

Thanks filmboss for such a prompt and concise reply. I've obviously got a lot to learn about these different fruits.

I'm still left pondering, though, why a pretty bog-standard hour of non-widescreen TV should end up taking almost all of a standard single layer dvd.

[marioval]

Thanks filmboss for such a prompt and concise reply. I've obviously got a lot to learn about these different fruits.

I'm still left pondering, though, why a pretty bog-standard hour of non-widescreen TV should end up taking almost all of a standard single layer dvd.

Just as filmboss said, its a matter of bitrate. Lower the bitrate and your file will be smaller but will also be lower quality.