Re: In-band track metadata attribute

On Tue, 2014-03-11 at 06:41 +1100, Silvia Pfeiffer wrote:
Could you provide some examples of the data that goes there for mp2-ts?
The same data that's currently listed for inBandMetadataTrackDispatchType would work, except without base64 encoding:
Let stream type be the value of the "stream_type" field describing the text track's type in the file's program map section, interpreted as an 8-bit unsigned integer. Let length be the value of the "ES_info_length" field for the track in the same part of the program map section, interpreted as an integer as defined by the MPEG-2 specification. Let descriptor bytes be the length bytes following the "ES_info_length" field. The text track in-band metadata track dispatch type<http://www.w3.org/html/wg/drafts/html/CR/embedded-content-0.html#text-track-in-band-metadata-track-dispatch-type> must be set to the concatenation of the stream type byte and the zero or more descriptor bytes bytes, expressed in hexadecimal using uppercase ASCII hex digits<http://www.w3.org/html/wg/drafts/html/CR/infrastructure.html#uppercase-ascii-hex-digits>. [MPEG2]<http://www.w3.org/html/wg/drafts/html/CR/references.html#refsMPEG2>
Even better might be including the entire "elementary stream info data"<http://en.wikipedia.org/wiki/Program-specific_information>:

Name    Number
of bits         Description
stream type     8       This defines the structure of the data contained within the elementary packet identifier.
Reserved bits   3       Set to 0x07 (all bits on)
Elementary PID  13      The packet identifier that contains the stream type data.
Reserved bits   4       Set to 0x0f (all bits on)
ES Info length unused bits      2       Set to 0 (all bits off)
ES Info length length   10      The number of bytes that follow for the elementary stream descriptors.
Elementary stream descriptors   N*8     When the ES info length is non-zero, this is the ES info length number of elementary stream descriptor bytes.