Encoding 65 frames with intra period 32 gives only 2 IRAP frames

[bart-kroon]

Hi all, I have a question and it may be related to #311 .

For MPEG experiments we use 65 frames with an intra period 32 to have three I-frames. When upgrading from VVenC 1.7.0 to 1.11.1, the final frame is now a B-frame (STSA). I suppose this is intended behavior, but is there a way to convince vvencFFapp to output three I-frames like before?

This is a current log-file for context: TMIV_A65_B02_RP4_geo_c00.log.
The structure in decoding order is: 31:IDR_W_RADL, RADL..., 63: IDR_W_RADL, RADL..., 64: STSA
(I switched DecodingRefreshType from 1 to 2 for testing. In both cases the STSA is there.)

This is from a previous experiment with VVenC 1.7.0: TMIV_A65_B02_RP4_geo_c00.log.
The structure in decoding order is: 0:IDR_N_LP, 32:CRA, RASL..., 64:CRA, RASL...

[adamjw24]

You have to specify --POC0IDR=1, which forces the old behavior.

Best, Adam

[bart-kroon]

I'll try. Thanks for the hint.

Update: it works. I'll close the issue.