[FFmpeg-devel] [PATCH v2 1/2] libavformat/mpegts: Extract arib_caption descriptor data into codecpar->extradata

[zheng qian]

On Mon, Apr 12, 2021 at 1:10 AM Jan Ekström <jeebjp at gmail.com> wrote:
> For context, just checked some random sample I had on hand:
>
> ARIB caption info: DMF: 0xa, reserved: 0x3, timing: 0x1
>
> So "both caption streams are selectable/showable when both received
> and playing back a recording" (0b1010), reserved bits are nonzero,
> timing is PTS based ("program based" seems to mean that).

I have checked several samples dumped from Japanese and
Brazilian TV shows that they all have a value of 0x3d for
additional_arib_caption_info that means they have value 0x3
for DMF field.

Regards,
zheng