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H264 CBR image jump as "heart-hit" && CBR quality is poor and bit rate is higher compare to FIXED QP or VBR mode

william wang63854
Intellectual 715 points

Hi

We are doing development on DM368/DM365 platform and facing some issues as below with the latest H264 codec lib v02.30.00.01.

1. H264 CBR image has many mosaic and jump as "heart-hit" if QP is more than 30.

2. CBR quality is poor and bit rate is higher compare to FIXED QP or VBR mode

we find the strange issue on “CBR vs Fixed QP(or VBR) mode”.

if set the codec with Fixed QP (or VBR) mode, the video quality will be ok and the bit-rate is low, suppose it is 2400Kbps.

After change the compression mode from Fixed QP to CBR(QP range from 25 to 35), the bit-rate increasing , suppose 3000kbps, but the video quality will be poor compare with Fixed QP(QP value is 30) mode.