[Mp4-tech] about Bitrate in JM13.2

[Ming Yang]

Hello, everybody:
I'm currently using JM13.2 to do some testing. I use QCIF sequence. The GOP
structure is I-B-B-P-B-B-P-B-B. I tried enabled Rate Control, and then tried
to compress the video sequence under different bit rate. However, after
encoding, the obtained bit rate is always very different from the designated
bit rate. For example, when I set the target rate to 100Kbps, the resulted
rate was around 200kbps. When I set the target rate to 200Kbps, the resulted
rate was around 400kbps. I'm very confused? Any idea about what's going on?
Thank you very much.
Sincerely,
Ming Yang
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