DM8107: DM8107 - H264 (v2.0) Picture timing SEI message and pic_struct_present_flag

Ivan Gonzalez Pagliere

Part Number: DM8107

Hello,

I'd like to request some clarification regarding the h264 codec's picture timing SEI message and pic_struct_present_flag. I'm developing on a DM8107 processor and the encoder's version is IVAHD_001 build iD 02.00.06.00.

In some cases (specifically for one-seg with ISDB-T norm), I have to send an elementary stream that has the picture timing SEI message, but with the SPS VUI parameters the pic_struct_present_flag = 0.

I was able to produce ES with both picture timing SEI message and buffering period SEI message, but I couldn't change the pic_struct_present_flag with these SEI messages enabled.

How can achieve this?

BR,

Ivan.

over 5 years ago

0 Prashanth Kumar15 over 5 years ago

Mastermind 8775 points

Hi Ivan,

The latest codec release version is 02.00.09.00. Recomming to use this if possible.

Please refer section Appendix B Control for Configurable NALU in Codec Userguide. along with VUICodingParams.

0 Ivan Gonzalez Pagliere over 5 years ago in reply to Prashanth Kumar15

Prodigy 30 points

Hi Prashanth,

Thank you for the prompt response.

These are the parameters I can edit regarding the vuiCodingParams :

staticParams->vuiCodingParams.vuiCodingPreset = IH264_VUICODING_USERDEFINED;
staticParams->vuiCodingParams.hrdParamsPresentFlag = 1;
staticParams->vuiCodingParams.timingInfoPresentFlag = 1;
staticParams->vuiCodingParams.numUnitsInTicks = algCreateParams->numUnitsInTick;
staticParams->vuiCodingParams.videoSignalTypePresentFlag = algCreateParams->enableVideoSignalType;
staticParams->vuiCodingParams.aspectRatioInfoPresentFlag = 1;
staticParams->vuiCodingParams.aspectRatioIdc = algCreateParams->aspectRatioIdc;

Maybe I can't change pic_struct_present_flag and this flag is conditioned only to the presence of the picture timing SEI message.
I thought that maybe there was some encoder's configuration that allowed the convination of pic_struct_present_flag = 0 and the presence of the picture timing SEI message at the same time.

Regarding the update of our codec's version, I'm afraid that is not possible for us.

BR,
Ivan.

0 Prashanth Kumar15 over 5 years ago in reply to Ivan Gonzalez Pagliere

Mastermind 8775 points

Hi Ivan,

Ivan Gonzalez Pagliere said:
Maybe I can't change pic_struct_present_flag and this flag is conditioned only to the presence of the picture timing SEI message.
I thought that maybe there was some encoder's configuration that allowed the convination of pic_struct_present_flag = 0 and the presence of the picture timing SEI message at the same time.

Yes, your understating is correct. pic_struct_present_flag will be conditioned with timing info SEI. There is no encoder parameter to control this flag independently.