Small ffmpeg & bitrate question

[vvkeer]

Hello,

Can somebody tell me what the meaning is of the 2 bitrates outputted here :

bitrate: 6272 kb/s (on the duration line)
and 8000 kb/s (on the stream #0.0 line)

What do they both mean ?
What is actually the bitrate of the movie ?

I picked this from following ouput :

FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
configuration: --prefix=/usr --libdir=${prefix}/lib --incdir=${prefix}/include/ffmpeg --enable-shared --enable-mp3lame --enable-gpl --enable-faad --mandir=${prefix}/share/man --enable-vorbis --enable-pthreads --enable-faac --enable-xvid --enable-dts --enable-amr_nb --enable-amr_wb --enable-pp --enable-libogg --enable-a52 --enable-theora --enable-libgsm --enable-x264 --enable-a52bin
libavutil version: 49.0.0
libavcodec version: 51.9.0
libavformat version: 50.4.0
built on Jun 4 2006 15:08:12, gcc: 4.0.3 (Ubuntu 4.0.3-1ubuntu5) Input #0, avi, from '15022009.mpg':
Duration: 02:10:00.0, start: 0.000000, bitrate: 6272 kb/s
Stream #0.0, 25.00 fps(r): Video: mpeg2video, yuv420p, 720x576, 8000 kb/s
Stream #0.1: Audio: mp3, 48000 Hz, stereo, 320 kb/s Must supply at least one output file

Thanks a lot !

[poisondeathray]

This is a MPEG2 file. I think 8000kb/s refers the the max bitrate when a 2pass encode is used, the 6272kb/s refers to the actual average bitrate.
You can double check this by doing the math:

Filesize = bitrate x running time