- From: wolenetz via GitHub <sysbot+gh@w3.org>
- Date: Tue, 22 Mar 2016 22:12:38 +0000
- To: public-html-media@w3.org
wolenetz has just created a new issue for https://github.com/w3c/media-source: == ISO BMFF bytestream: how can CEA 608 / 708 embedding be supported? == If I understand correctly, CEA 608 / 708 embedding of text track data is one option for sourcing text track data described within https://dev.w3.org/html5/html-sourcing-inband-tracks/#mpeg4 However, such embedding/signalling of the embedding occurs after the ISO BMFF initialization segment. Since track types and counts must remain consistent across initialization segments for a SourceBuffer, and the initialization segment received algorithm is the sole place in MSE where various track attributes (like SourceBuffer.TextTracks and HTMLMediaElements.TextTracks) are populated, is it impossible to support CEA 608 / 708 embedding of text track data in ISO BMFF in any compliant MSE implementation? @silviapfeiffer : Am I missing some part of signalling for CEA 608 / 708 in ISO BMFF that actually occurs within an MSE initialization segment? @jdsmith3000 / @mwatson2 / other MSE user agent implementors: Do you have this working somehow? Does the MSE ISO-BMFF bytestream spec and/or https://dev.w3.org/html5/html-sourcing-inband-tracks/#mpeg4 need some update, or am I indeed missing some simple signalling within the defined MSE ISO BMFF initialization segment which allows such embedded text tracks to be known at the time of executing the initialization segment received algorithm? Please view or discuss this issue at https://github.com/w3c/media-source/issues/58 using your GitHub account
Received on Tuesday, 22 March 2016 22:12:40 UTC