Dynamic parameter FPS

Holger Eberhard102906

We use DM8168 / DVR_RDK version 3 and 4.

I have a question that belongs to the setting of dynamic encoder parameter. In function Venc_setDynamicParam(), case VENC_FRAMERATE "targetFps" and also "targetBitRate" is set.

Deeper in EncLink_codecSetFps() a check "if(params->targetBitRate != 0)" is done.

What's the reason of setting both parameter at the same time. targetBitRate is a dynamic parameter too and can be change always.

over 12 years ago

0 Badri Narayanan over 12 years ago

TI__Guru 59700 points

Change in frameRate is typically associated with change in bitrate as if you are reducing frameRate you would like to correspondingly adjust targetBitrate as well. To ensure both get applied simultanesously to the encoder this option is provided.Changing of bitrate or frameRate will result in encoder inserting an IDR frame in DVR RDK and this momentarily breaks GOP structure. To minimize the disruption it is preferred to apply bitrate and framerate changes together instead of as two separate commands.

0 Holger Eberhard102906 over 12 years ago in reply to Badri Narayanan

Genius 4570 points

Thanks for this information.

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Dynamic parameter FPS