Re: [FFmpeg-devel] [PATCH 2/2] avutil: add HDR10+ dynamic metadata serialization function

["Raphaël Zumer" <raphael.zumer@vimeo.com>]

On 3/2/23 13:57, James Almer wrote:
>  > The SEI for HEVC does keep the country code in the payload, but not AV1.
> Are you sure about HEVC? I just checked a sample and trace_headers 
> reported this:
>
> [trace_headers] Prefix Supplemental Enhancement Information
> [trace_headers] 0  forbidden_zero_bit               0 = 0
> [trace_headers] 1  nal_unit_type               100111 = 39
> [trace_headers] 7  nuh_layer_id                000000 = 0
> [trace_headers] 13 nuh_temporal_id_plus1          001 = 1
> [trace_headers] 16 last_payload_type_byte    00000100 = 4
> [trace_headers] 24 last_payload_size_byte    01000000 = 64
> [trace_headers] User Data Registered ITU-T T.35
> [trace_headers] 32 itu_t_t35_country_code    10110101 = 181
> [trace_headers] 40 itu_t_t35_payload_byte[1] 00000000 = 0
> [trace_headers] 48 itu_t_t35_payload_byte[2] 00111100 = 60
> [trace_headers] 56 itu_t_t35_payload_byte[3] 00000000 = 0
> [trace_headers] 64 itu_t_t35_payload_byte[4] 00000001 = 1
> [trace_headers] 72 itu_t_t35_payload_byte[5] 00000100 = 4
> [trace_headers] 80 itu_t_t35_payload_byte[6] 00000001 = 1
>
> Which is in line with section 8.3.1 of ITU-T Rec. H.274 as well as 
> section D.2.6 of ITU-T Rec. H.265.
>
> So i think this function should not set the country code at all as part 
> of the payload, and start with itu_t_t35_terminal_provider_code.

OK, I will make that change since both HEVC and AV1 implementations seem to match.

Thanks
Raphaël Zumer


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