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Old 7th September 2011, 13:46   #1  |  Link
gradinternatwd
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Internal SRT Subtitles

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
- SRT subtitles are purely text.
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Old 7th September 2011, 14:00   #2  |  Link
sneaker_ger
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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.
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Old 7th September 2011, 14:12   #3  |  Link
gradinternatwd
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Quote:
Originally Posted by sneaker_ger View Post
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
MPEG4 Timed Text spec

Is there another format for 'internal SRT' or are these two formats what SRTs are transcoded into?
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Old 7th September 2011, 14:35   #4  |  Link
sneaker_ger
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Well, in mkv it obviously has nothing to do with any MPEG standards, as shown in the link. I have no idea about mp4.
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Old 8th September 2011, 09:14   #5  |  Link
Chetwood
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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.
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Old 8th September 2011, 13:10   #6  |  Link
gradinternatwd
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Quote:
Originally Posted by Chetwood View Post
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).
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Old 8th September 2011, 13:31   #7  |  Link
Keiyakusha
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Quote:
Originally Posted by gradinternatwd View Post
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.
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Old 8th September 2011, 13:32   #8  |  Link
gradinternatwd
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Quote:
Originally Posted by Keiyakusha View Post
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!
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Old 9th September 2011, 05:49   #9  |  Link
Chetwood
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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.
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