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Minimum bit-rate

ranchu
Guru 20755 points

Hello,

The following question refer to MPEG-2,MPEG-4,H.264 encoder/decoder for HDVICP2, DM8168:

Some of our required bit rates are very slow (e.g., < 0.128 Mbits/sec). Will the encoder/decoder able to support encoding and decoding at < 0.128 Mbps when for a specific combination of level, FPS, and resolution? Stated another way, will a decoder be capable of handling a stream at any bit rate < the maximum indicated for the decoder, and will an encoder allow the user to specify any bit rate < the maximum indicated?

Best Regards,

Ran

  • 0
    TI__Genius 17215 points

    Ran - 

    Decoder -  The decoding operation of decoder does not depend on the bitrate or framerate. Hence the decoder does not have any limit of framerate or bitrate in terms of functionality. You can decode any low value of framerate or bitrate.

    Encoder - There is a minimum framerate and bitrate provided. I think min framerate supported is 0.5fps or 1 fps (not sure between these 2 numbers) and the min value of targetBitrate should also be in the user guide. I think you should be able to encode anything above 10kbps (pls check the UG though). But of course if you set 10kbps for a D1 resolution and 30fps, you may see the encoder not being able to achieve this bitrate even with highest QP. So very low bitrate us supported but you need to ahve framerate and resolution set according to get a meaningful operation out of that low bitrate.

    regards

    Yashwant

  • 0 in reply to Yashwant Dutt
    Guru 20755 points

    Hi Yashwant,

    I did not find in the H.264,MPEG-4 encoder UG's minimum bit rate, can you please refer me to this, or verify what is the minimum bitrate values ?

    Best Regards,

    Ran