On Thu, Apr 30, 2020 at 4:30 AM Kieran Kunhya <kier...@obe.tv> wrote: > > On Thu, 30 Apr 2020 at 07:22, Roger Pack <rogerdpa...@gmail.com> wrote: > > > > > c9153590e5f167e41910d867639eb887164e28d2 > > 0001-closed-caption-decoder-accept-and-decode-a-new-codec.patch > > > > From bf29fe5330e83e37cf064b18918185c6b00d9b9f Mon Sep 17 00:00:00 2001 > > > > From: rogerdpack <rogerpack2...@gmail.com> > > > > Date: Tue, 28 Apr 2020 05:15:15 +0000 > > > > Subject: [PATCH 1/3] closed caption decoder: accept and decode a new > > codec > > > > type of 'raw 608 byte pairs' > > > > How does this content exist? Are you defining your own file format with the > byte pairs?
It's transmitted as "raw byte pairs" by analog TV broadcast in the US. https://en.wikipedia.org/wiki/EIA-608 has details. I believe it transmits one closed caption character (or control code) per frame (basically a single byte pair on "line 21") so it can do 30 closed caption chars/second. Anyway that's where it's originating from. Good question :) Thanks! _______________________________________________ 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".
