[Mjpeg-users] mplex: peak bitrate average bitrate

2004-01-06 Thread Libor Stefek 
Hello,
I noticed  that  sometime mplex reports higher average bitrate than peak 
bitrate.
It is strange, isn't it?

I have been using mjpegtools for some time for DV-SVCD and
bitrates were different in usual way: peak ~ average + 20%.
Now I'm trying to create my first dvd, so I changed mpeg2enc and mplex 
options
so it looks like :
lav2yuv x.eli | mpeg2enc -f 8 -q 4  -4 1 -2 1 -b 7500 -s -g 6 -G 15 -B 
240 -o video.m2v
lav2wav x.eli | mp2enc -b 224  audio.mp1
mplex -V -f8 -h -o dvd.mpg video.m2v audio.mp1

and mplex reports usually average bitrate near to 7,5Mbit/s
but peak bitrate about 7Mbit/s.
I don't understand what I'm doing wrong.
What is acceptable difference between those bitrates?
I use mjpegtools 1.6.1.92.
Thanks for any hint.

Libor





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[Mjpeg-users] mpeg2enc messages - what they means?

2003-02-12 Thread Libor Stefek 
Hi everybody,
each time I do something with mjpegtools, I think about
meaning of INFO: messages from mpeg2enc.
for ex.:
   INFO: [mpeg2enc] GOP LENGTH = 12
   INFO: [mpeg2enc] Frame start 262 I 2 264
   INFO: [mpeg2enc] Frame end 262 307.19 14390.01 10.0 2652.17
   INFO: [mpeg2enc] Frame start 263 B 0 262
   INFO: [mpeg2enc] Frame end 263 34.73 14424.74 10.0 2662.17

It is possible to read from these numbers something useful about
encoding process? For example, I'm interested how to detect high motion
scenes in material, may I find them by inspecting mpeg2enc log?

Thanks in advance

Libor Stefek



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