[FFmpeg-devel] [PATCH v3 1/1] avformat/mpegtsenc: Write necessary descriptors into PMT for arib_caption muxing

[zheng qian]

On Fri, Apr 16, 2021 at 12:22 AM zheng qian <xqq at xqq.im> wrote:
> +
> +                // data_component_descriptor, defined in ARIB STD-B10, part 2, 6.2.20
> +                *q++ = 0xFD;  // descriptor_tag: ARIB data coding type descriptor
> +                *q++ = 3;     // descriptor_length
> +                put16(&q, data_component_id);  // data_component_id
> +                // additional_arib_caption_info: defined in ARIB STD-B24, fascicle 1, Part 3, 9.6.1
> +                // Use most commonly used value 0x3D: DMF(0x3), Reserved(0x3), Timing(0x1)
> +                *q++ = 0x3D;

I have tested lots of TV streams in Japan from terrestrial channels
near Tokyo, and plenty of BS/CS satellite channels. All of them have
a value of 0x3d for the additional_arib_caption_info field so I used it.

Regards,
zheng

>              }
>          break;
>          case AVMEDIA_TYPE_VIDEO:
> --
> 2.29.2
>