Internal SRT Subtitles

[gradinternatwd]

Question: When people refer to 'internal SRT' subtitles, what formats are they referring to?

From the muxing processes which I have tried (primarily HandBrake), SRT subtitles are transcoded to MPEG-4 Timed Text for .mkv / m4v (mp4). And my searching of Doom9, HandBrake, and Google has not revealed any relevant information.

Notes:
- MPEG-4 Timed Text standard link (http://en.wikipedia.org/wiki/MPEG-4_Part_17)
- SRT subtitles are purely text.

[sneaker_ger]

For mkv:
http://matroska.org/technical/specs/subtitles/srt.html

When speaking of embed srt subtitles in mkv, it's usually called that way, because mkvtoolnix uses srt for input and output format for these simple text subtitles.

[gradinternatwd]

For mkv:
http://matroska.org/technical/specs/subtitles/srt.html

When speaking of embed srt subtitles in mkv, it's usually called that way, because mkvtoolnix uses srt for input and output format for these simple text subtitles.

I understand that the video community at large refers to it as 'internal srt'. I am curious to if the 'internal srt' is purely Timed Text as defined by Timed Text specification or MPEG4 Timed Text.

Timed Text spec (http://www.w3.org/AudioVideo/TT/)
MPEG4 Timed Text spec (http://en.wikipedia.org/wiki/MPEG-4_Part_17)

Is there another format for 'internal SRT' or are these two formats what SRTs are transcoded into?

[sneaker_ger]

Well, in mkv it obviously has nothing to do with any MPEG standards, as shown in the link. I have no idea about mp4.

[Chetwood]

Internal simply refers to the fact, that the sub file is inside the container. So you can take pretty much any type of 'regular' subtitle you like, SRT, SSA, PGS, Vobsub and mux it into an MKV or MP4. Inside MKVs the subs keep their format, don't know about MP4 though.

[gradinternatwd]

Internal simply refers to the fact, that the sub file is inside the container. So you can take pretty much any type of 'regular' subtitle you like, SRT, SSA, PGS, Vobsub and mux it into an MKV or MP4. Inside MKVs the subs keep their format, don't know about MP4 though.

Yes, I understand what internal refers to. And no, this isn't always the case (i.e. when an external SRT is muxed into a .mp4, it is transcoded to Timed Text).

[Keiyakusha]

Yes, I understand what internal refers to. And no, this isn't always the case (i.e. when an external SRT is muxed into a .mp4, it is transcoded to Timed Text).

Actually he said that the subs keep they format in MKV, and he don't know about mp4...
And mp4, afaik only supports vobsub and timed text. And adding to that, ttxt is not very well supported bu current subtitle renderers.

[gradinternatwd]

Actually he said that the subs keep they format in MKV, and he don't know about mp4...
And mp4, afaik only supports vobsub and timed text. And adding to that, ttxt is not very well supported bu current subtitle renderers.

This is true. So much for posting at 5 in the morning. Thanks! :thanks:

[Chetwood]

With Google you'll find some threads on Apple forums dealing with SRTs and MP4s. Maybe this will help to determine whether it's actually possible. Wikipedia doesn't help.