[Bug]: Media sdk sample(sample_encode) encoding problem with bit rate control doesn't work on the specific yuv file.

### Which component impacted?

Encode

### Is it regression? Good in old configuration?

None

### What happened?

1. Run Media SDK sample, sample_decode, on Linux platform, to generate **target.yuv file** by decoding the given hevc source.
Running Command line: ./sample_decode h265 -gpucopy::on -device /dev/dri/card0 -i ./program_2.hevc -o ./**target.yuv** -n 300
You can access the input source file program_2.hevc here:
_**program_2.hevc ： https://pan.baidu.com/s/1fjsNCfDrsBoTos-_qm6POQ Extraction code：7lym**_
2. Run Media SDK sample , sample_encode , on Linux platform, bit rate control doesn't work well on the **target.yuv file**. The output bit rate is much higher than the set value.
3. Running command: ./sample_encode h265 -gpucopy::on -i ./**target.yuv** -o ./output.h265 -w 1920 -h 1080 -dstw 1920 -dsth 1080 -b 10000 -f 50 -hw -async 1 -u speed -r 1 -g 100 .
4. The input yuv file only contains 300 frames, but with bit rate set value being 10000, framerate being 50, the output.h265 files is about 28MB which is much higher than the expected.
5. We have tried with cbr , vbr, la and other methods, all failed but except method : **"extbrc:on"** .The output file with extbrc method on is about 7.4MB, but the output file has a few totally black frames. We have no idea about it.
6. Please help us find a valid bit rate control method without any problem on the given source .

Thank you very much!

### What's the usage scenario when you are seeing the problem?

Playback, Video Analytics

### What impacted?

intel media sdk version

# /opt/intel/mediasdk/bin/vainfo

libva info: VA-API version 1.12.0
libva info: Trying to open /opt/intel/mediasdk/lib64/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_12
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.12 (libva 2.12.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 21.2.3 (008fb3b4)
vainfo: Supported profile and entrypoints

os version :5.10.0-1044-oem ubuntu1~20.04

### Debug Information

_No response_

### Do you want to contribute a patch to fix the issue?

None