On Tue, Apr 20, 2021 at 6:46 AM Jan Ekström <jee...@gmail.com> wrote: > > On Tue, Apr 20, 2021 at 12:11 AM Marton Balint <c...@passwd.hu> wrote: > > > > > > > > On Mon, 19 Apr 2021, zheng qian wrote: > > > > > Is there anyone who could review this patch? > > > > Jan was interested in this, so preferably he should also comment, but it > > looks fine to me. > > > > OK, this explains why I didn't see my response on patchwork. > Apparently he had CC'd me and thus the "reply" button in gmail sent an > e-mail directly to him and I was hurrying due to being on a lunch > break -_- (and thus didn't notice). > > In any case, I did some comments and am now waiting for a second > opinion regarding the usage of stream_identifiers in the ARIB context. > After all, the specifications do let one utilize 0x30-0x37 for profile > A/full-seg ARIB captions, so there must be a reason for them to not be > as limited as profile C/1seg to a single identifier :) >
I've found related definitions in ARIB TR-B14, Fascicle 1, 4.2.8.1 and you can find it in http://web.archive.org/web/20160319090430/http://arib.or.jp/english/html/overview/doc/8-TR-B14v2_8-1p3-2-E2.pdf 4.2.8.1 section says: "However, for component tag values of default ES of caption, set 0x30 or 0x87, for component tag value of default ES of superimpose, set 0x38 or 0x88." That means 0x30 is considered as the default value for Profile A caption ES. The section didn't describe how to utilize other values rather than 0x30 in the 0x30~0x37 range, and due to the second language caption is designed to be multiplexed in the same ES, seems that it's assumed that there will be usually only one ARIB caption within a program. Anyway, I have never seen a TS program that carries 2 or more arib_caption streams among Japanese TV channels. Even if we manually try to remux 2 or more arib_caption streams into a TS program and both use the component tag of 0x30, it shouldn't cause any playback problems. Best regards, zheng qian > Jan > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
