Bitrates

[banzai]

I'm quite curious as to what bitrates people are encoding video content with mpeg4.

My understanding of mpeg4 is that it is optimized for lower bitrate applications. When you compare mpeg4 to mpeg2 (same resolution and framerate), mpeg4 outperforms mpeg2 (for visual quality) at bitrates of less than around 1 megabit, and mpeg2 outperforms mpeg4 at bitrates in excess of around 1.5-1.75 megabit (mostly due to overhead). In between it's about a tie.

What are your experiences with this?

[Gotenks420]

i did an encode of a 93 minute movie with all the new options b frame etc. on, i used a bitrate of around 730 and the final product was well under 700mb, 620mb if i remember correctly (audio data was 86mb). so out of pure curiostity i reencoded the video with all the same settings except i changed the bitrate to 906. i was very pleased with the output combined with the audio (86mb) the final product was 704mb, i cropped off a little bit of the end credits and it it fit nicely on to the cd.

Over all i was very pleased at the ease and the final product with divx 5 encoding.

[khp]

Why did you use bitrate=730 the first time ?

I'am at work atm, so I don't have a bitrate calculator here.

But calculating by hand i get bitrate=923 assuming no avifile overhead. Allowing for avifile overhead, 906 sounds like the correct bitrate.

[Gotenks420]

for some reason it was what gnot told me to use 730, i think i calculated the audio wrong.