H.264 bits-per-slice slicing mode gone in 2.00.00.xx version?

Misha Jiline

Hello all,

As I can see from the documentation to H.264 encoder v. 2.00.00.09, sliceMode=1 (bits-per-slice interpretation of sliceSize) is now "reserved" and according to my experiments, it does not work (it set entropyMode to 0 (CAVLC) and tried all possible encodingPreset's). It's a quite a serious problem for us as we use RTP streaming to clients which do not support FU mode of RTP packetization, thus they require slicing with a slice size fitting to ~1400 bytes MTU. I tried two other slicing modes, but both do not satisfy us: rows-per-slice mode occasionally (on IDR frames) produces too large slices even when sliceSize is set to the lowest possible value (1 row) and MBs-per-slice works only when sliceSize is set to quite low value (a few MBs) which produces low-quality encoded picture.

I wonder if it's possible to bring back the bits-per-slice (sliceMode=1) slicing mode?

With best regards,

Valery

over 15 years ago

0 Lakshmi over 15 years ago

TI__Prodigy 520 points

Valery

can you please let us know which platform are you reffering to here?

thanks

Lakshmi

0 Yashwant Dutt over 15 years ago in reply to Lakshmi

TI__Genius 17215 points

Hi Valery,

I assume you are referring to DM365 ver 2.00.00.09 version of codec. Yes, that version did not have support to specify slice_size in units of bytes. Good news is that we have added that support our upcoming codec release. See http://processors.wiki.ti.com/index.php/H.264_DM36x_Ver_2.0_Codec whose production releease will be available in Nov. It can do 720P@30fps on DM365(300Mhz) and 1080P@24fps on DM368

If you need something urgently, we have a beta release of that codec which you can use. Please ask your local TI contact for getting the beta release.

regards

Yashwant

0 Misha Jiline over 15 years ago in reply to Yashwant Dutt

Prodigy 200 points

Hello Yashwant,

Ok, I'll try to get the beta you mentioned. Do I understand correctly that the upcoming codec release supports bits-per-slice slicing mode even in "platinum" performance mode? In fact, I got MBs-per-slice mode more or less working for our tasks (though not perfect, so bits-per-slice mode is still very wishful), but it's only allowed in compatibilty mode (not platinum) which is less performant.

With best regards,

Valery

0 Yashwant Dutt over 15 years ago in reply to Misha Jiline

TI__Genius 17215 points

Yes, You will get this feature in platinum mode. The perfromance will be 720P@30fps(300Mhz) on DM365 and 1080P@24fps on DM368(432 Mhz). It is little less than the default performance of 1080P@30fps on DM368 which you otherwise get.

regards

Yashwant

0 Misha Jiline over 15 years ago in reply to Yashwant Dutt

Prodigy 200 points

Yashwant,

Ok, thanks a lot, that's just we need.

With best regards,

Valery

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H.264 bits-per-slice slicing mode gone in 2.00.00.xx version?