On Mon, 22 Dec 2003, Daniel Silva wrote:
> When encoding a bitstream with the command:
>
> mpeg2enc "inputfile" -f 3 -b 7500 -q 5 -o "outputfile"
>
> What is the maximum bitrate I should expect?
That depends on what size of frames you're encoding.
> I was trying to reach a maximum bitrate of 7500 kbits/s, so I used the
> option "-b 7500", but I realised that it only reached a bitrate of
> 1000kbits/s. It seems that the mjpegtools start to control the buffer from
If you are encoding small frame sizes (160x120 or 320x240) then 1000
kbits is probably all that are needed.
> Is this normal? What can I do to reach a higher bitrate?
What type of data are you encoding? DV, computer generated,
analog capture, etc?
What is the target of the encoding - by that I mean are you creating
a SVCD, DVD, VCD, or none of those?
For DVD "-f 8" would be a better choice, SVCD is -f 4 and VCD -f 1.
It will probably be necessary to specify '-V 220' with the generic
(-f 3) format. The other pre-defined formats set -V automatically
but with generic you may need to explicitly set -V.
Steven Schultz
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