i.MX ProcessorsのトピックRe: VPU Bitrate changes on the fly

VPU Bitrate changes on the fly

jparrish88 — Tue, 24 Jun 2014 15:08:44 GMT

Could someone throw out ideas on how to change the bitrate of an H264 video encoding on the fly?

I believe that, the bitrate configuration is fixed at launch for the VPU.

Does anyone have suggestions on how to work on this?

Re: VPU Bitrate changes on the fly

gusarambula — Thu, 26 Jun 2014 16:04:22 GMT

joanxie , would you please help us with this question?

Re: VPU Bitrate changes on the fly

joanxie — Fri, 04 Jul 2014 07:56:22 GMT

mx6 vpu can support it. refer to the vpu api,

bitRate is the target bit rate in kbps. If 0, there is no rate control and pictures are encoded with a quantization parameter equal to quantParam in EncParam.

for example,

+ {

+ int bitrate = 1000;

+ if (frame_id==100)

+ vpu_EncGiveCommand(handle, ENC_SET_BITRATE, &bitrate);

+ }

ret = vpu_EncStartOneFrame(handle, &enc_param);