How to set the h.264 'encoding level'?

[gennadii_mog]

Hi

we wondered how we can set the 'level' of our h.264 encoding

when we say 'level' we mean this level:http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC#Levels

thanks

Gennadii

[Chao_Y_Intel]

Gennadii,

Could you please check the level_idc parameter in the par file?

100 0 /* profile_idc (77-main, 100-high); level_idc

Thanks,
Chao

[gennadii_mog]

thanks Chao!

1. so if we want to use 5.1, we should put level_idc = 51?

2. wonder what it means -(check that num_ref_frames and frame size are in accordance with the level). how can we find the relation between these parameters?

thanks again

Genna

[Emmanuel_W_]

Hi Genna,

Check Annex A of the H.264 specs. It describes all the maximum parameter valueassociate with each level.

Emmanuel

[Chao_Y_Intel]

Hello,

>>so if we want to use 5.1, we should put level_idc = 51?

Right, See Annex A of H.264/AVC.

Options:

10 1 (supports only QCIF format and below with 380160 samples/sec)
11 1.1 (CIF and below. 768000 samples/sec)
12 1.2 (CIF and below. 1536000 samples/sec)
13 1.3 (CIF and below. 3041280 samples/sec)
....

51 5.1 (Supports 4096x2304 format. Frame coding only. 251658240 samples/sec)
...

Thanks,
Chao