mp4box not processing tags in .SRT subtitle mux

bennynihon · 20th July 2014, 06:45

I'm trying to properly import a .SRT file, using MP4Box, that contains <xml> or <html> type tags

Code:

1
00:00:00,010 --> 00:01:55,110
<font color="#ffff80"><i><b>This is a test</b></i></font>

Problem is, when playing the muxed output .m4v file on an Apple TV or in iTunes, those tags are shown in the actual subtitle text. It's clear the options I have tried fail to get MP4Box to properly process the .SRT into an Apple compatible .mp4/.m4v file. I'm doing something like the following.

Code:

mp4box.exe -add movie.h264 -add audio.ac3:lang=en -add subtitles.srt:lang=en:hdlr=sbtl -new output.m4v

Documentation is a bit spotty, so it's unclear to me if there are better options to ensure Apple compatible output, or if it simply cannot process tags properly.

Oddly though, if you use

Code:

mp4box.exe -ttxt subtitles.srt

that seems to incorrectly process the tags too.

Code:

<TextSample sampleTime="00:00:00.010" xml:space="preserve">&lt;font color=&quot;#ffff80&quot;&gt;This is a test;&lt;/font&gt;<Style fromChar="24" toChar="71" styles="Bold Italic " fontID="1" fontSize="18" color="ff ff ff ff"/>
</TextSample>

Any help is appreciated.

Selur · 20th July 2014, 13:24

Nor really surprising, that the whole html tagging of the fonts is not supported by most programs, since afaik. the official srt sepcification didn't include any formating. So all formating additions are kind of in official.
-> your might want to look at tools which specify in subtitle handling and conversion to get a better srt -> ttxt conversion

Kurtnoise · 21st July 2014, 10:41

It doesnt make any sense to have a font color without knowing the font name or the font family related...

SeeMoreDigital · 21st July 2014, 20:16

Agreed...

A typical 'TTXT' header contains the following type of information: -

Code:

<?xml version="1.0" encoding="UTF-8" ?>
<!-- GPAC 3GPP Text Stream -->
<TextStream version="1.1">
<TextStreamHeader width="1024" height="432" layer="0" translation_x="0" translation_y="0">
<TextSampleDescription horizontalJustification="center" verticalJustification="bottom" backColor="0 0 0 0" verticalText="no" fillTextRegion="no" continuousKaraoke="no" scroll="None">

<FontTable>
<FontTableEntry fontName="Serif" fontID="1"/>
</FontTable>

<TextBox top="0" left="0" bottom="432" right="1024"/>
<Style styles="Normal" fontID="1" fontSize="24" color="ff ff ff ff"/>
</TextSampleDescription>
</TextStreamHeader>

<TextSample sampleTime="00:00:00.000" xml:space="preserve"></TextSample>

<TextSample sampleTime="00:00:01.000" xml:space="preserve">TTXT UTF-8 Subtitle Test.
For use with the High-Definition Network Media Players.</TextSample>
<TextSample sampleTime="00:00:06.000" xml:space="preserve"></TextSample>

EDIT: Thinking about it some more... I can't imagine that Apple devices fully support ISO/IEC 14496-17 '.ttxt subtitles'. Surely they use some weird half-ass proprietary Apple format!?

Cheers

hello_hello · 21st July 2014, 20:45

Someone was having subtitle problems here. I don't know if it's related. http://forum.doom9.org/showthread.ph...68#post1686268

SeeMoreDigital · 21st July 2014, 21:27

Quote:

Originally Posted by hello_hello

Someone was having subtitle problems here. I don't know if it's related. http://forum.doom9.org/showthread.ph...68#post1686268

Nope... That poster is working with (multiple) 'graphics based' idx/sub subtitles

foxyshadis · 23rd July 2014, 02:33

There are a variety of mutually-incompatible versions of formatted TTXT (TTML is supported here and there), I don't know if iOS supports any of them. HTML-formatted SRT files are a proprietary extension from VobSub/VSFilter, nothing else reads them but AegiSub, although there's a WebVTT that's similar but stuck in draft hell. Running yours through AegiSub will handily convert to ASS, then you can upload to Subtitle Converter and mux to see if iOS supports the creaky standard TTML. GPAC will mux that if you rename it to .ttxt.

Problem is that site isn't very stable, and the only other converter I can find is payware called EZTitles. Not much ttxt authoring support in the open source world.

Kurtnoise · 23rd July 2014, 07:54

Subtitle Edit supports ttxt format as well...

Anyway, you don't need to worry about the font color during the mux for Apple devices as target because using iOS 7.1 and higher, you can override the colors for subtitles by using your own style.

It's available through Settings -> General -> Accessibility -> Subtitles & Captioning :

SeeMoreDigital · 23rd July 2014, 09:38

Quote:

Originally Posted by foxyshadis

GPAC will mux that if you rename it to .ttxt.

Hmmm...

I'm of the opinion that bennynihon might be wasting his time trying to create .ttxt subtitles. As I'm not sure Apple TV or iTunes supports them. I know for sure that QuickTime player doesn't support ttxt subtitles placed within the .mp4 container...

Kurtnoise · 23rd July 2014, 10:18

Quote:

Originally Posted by SeeMoreDigital

As I'm not sure Apple TV or iTunes supports them.

I'm sure that iTunes does...

SeeMoreDigital · 23rd July 2014, 14:39

That's encouraging...

I see there's a coloured font. Are you able to provide a short sample so I can add it to my collection?

Cheers

bennynihon · 31st July 2014, 17:08

yeah, I've come to the conclusion that mp4box doesn' support tags, as it may not even be a supported tag in the SRT format. So I've just made sure to find subtitles that don't include those tags. And yes, I've been successful getting subtitles to work just fine in iTunes, Apple TV, etc. Thanks

Kurtnoise · 1st August 2014, 13:40

Quote:

Originally Posted by bennynihon

yeah, I've come to the conclusion that mp4box doesn' support tags, as it may not even be a supported tag in the SRT format.

This has been added in revision 5333...

@SMD: oops...I missed your post. I'll upload a sample asap.

SeeMoreDigital · 4th August 2014, 15:34

Quote:

Originally Posted by Kurtnoise

@SMD: oops...I missed your post. I'll upload a sample asap.

Thanks, that will be great

Kurtnoise · 6th August 2014, 14:14

http://www.mediafire.com/download/16...ample_ttxt.m4v

SeeMoreDigital · 6th August 2014, 14:24

Many thanks

SeeMoreDigital · 6th August 2014, 17:48

Hi Kurtnoise,

I've tried using Yamb to de-mux the ttxt stream from the sample you provided. But the ttxt stream was not visible!

Do you have a version of MP4box that works?

Kurtnoise · 7th August 2014, 11:09

That's strange...Using any builds from here should work.

Anyway, here is the ttxt :

Code:

<?xml version="1.0" encoding="UTF-8" ?>
<!-- GPAC 3GPP Text Stream -->
<TextStream version="1.1">
<TextStreamHeader width="400" height="60" layer="0" translation_x="0" translation_y="0">
<TextSampleDescription horizontalJustification="center" verticalJustification="bottom" backColor="0 0 0 0" verticalText="no" fillTextRegion="no" continuousKaraoke="no" scroll="None">
<FontTable>
<FontTableEntry fontName="Serif" fontID="1"/>
</FontTable>
<TextBox top="0" left="0" bottom="60" right="400"/>
<Style styles="Normal" fontID="1" fontSize="20" color="ff ff 00 ff"/>
</TextSampleDescription>
</TextStreamHeader>
<TextSample sampleTime="00:00:00.000" xml:space="preserve"></TextSample>
<TextSample sampleTime="00:00:05.570" xml:space="preserve">Aren't you eating breakfast, Nao?</TextSample>
<TextSample sampleTime="00:00:07.820" xml:space="preserve">I've already eaten.</TextSample>
<TextSample sampleTime="00:00:09.450" xml:space="preserve">What about you, Yuki? Today's your shift as drill instructor, isn't it?</TextSample>
<TextSample sampleTime="00:00:13.580" text="" />
</TextStream>

20th July 2014, 06:45	#1 \| Link
bennynihon Registered User Join Date: Oct 2001 Posts: 106	mp4box not processing <font> tags in .SRT subtitle mux I'm trying to properly import a .SRT file, using MP4Box, that contains <xml> or <html> type tags Code: 1 00:00:00,010 --> 00:01:55,110 <font color="#ffff80"><i><b>This is a test</b></i></font> Problem is, when playing the muxed output .m4v file on an Apple TV or in iTunes, those <font> tags are shown in the actual subtitle text. It's clear the options I have tried fail to get MP4Box to properly process the .SRT into an Apple compatible .mp4/.m4v file. I'm doing something like the following. Code: mp4box.exe -add movie.h264 -add audio.ac3:lang=en -add subtitles.srt:lang=en:hdlr=sbtl -new output.m4v Documentation is a bit spotty, so it's unclear to me if there are better options to ensure Apple compatible output, or if it simply cannot process <font> tags properly. Oddly though, if you use Code: mp4box.exe -ttxt subtitles.srt that seems to incorrectly process the <font> tags too. Code: <TextSample sampleTime="00:00:00.010" xml:space="preserve"><font color="#ffff80">This is a test;</font><Style fromChar="24" toChar="71" styles="Bold Italic " fontID="1" fontSize="18" color="ff ff ff ff"/> </TextSample> Any help is appreciated.

20th July 2014, 13:24	#2 \| Link
Selur Registered User Join Date: Oct 2001 Location: Germany Posts: 7,504	Nor really surprising, that the whole html tagging of the fonts is not supported by most programs, since afaik. the official srt sepcification didn't include any formating. So all formating additions are kind of in official. -> your might want to look at tools which specify in subtitle handling and conversion to get a better srt -> ttxt conversion __________________ Hybrid here in the forum, homepage

23rd July 2014, 07:54	#8 \| Link
Kurtnoise Swallowed in the Sea Join Date: Oct 2002 Location: Aix-en-Provence, France Posts: 5,191	Subtitle Edit supports ttxt format as well... Anyway, you don't need to worry about the font color during the mux for Apple devices as target because using iOS 7.1 and higher, you can override the colors for subtitles by using your own style. It's available through Settings -> General -> Accessibility -> Subtitles & Captioning : Last edited by Kurtnoise; 23rd July 2014 at 10:21.

23rd July 2014, 14:39	#11 \| Link
SeeMoreDigital Life's clearer in 4K UHD Join Date: Jun 2003 Location: Notts, UK Posts: 12,279	That's encouraging... I see there's a coloured font. Are you able to provide a short sample so I can add it to my collection? Cheers __________________ \| I've been testing hardware media playback devices and software A/V encoders and decoders since 2001 \| My Network Layout & A/V Gear \|

31st July 2014, 17:08	#12 \| Link
bennynihon Registered User Join Date: Oct 2001 Posts: 106	yeah, I've come to the conclusion that mp4box doesn' support <font> tags, as it may not even be a supported tag in the SRT format. So I've just made sure to find subtitles that don't include those tags. And yes, I've been successful getting subtitles to work just fine in iTunes, Apple TV, etc. Thanks

21st July 2014, 10:41	#3 \| Link
Kurtnoise Swallowed in the Sea Join Date: Oct 2002 Location: Aix-en-Provence, France Posts: 5,191	It doesnt make any sense to have a font color without knowing the font name or the font family related...

21st July 2014, 20:45	#5 \| Link
hello_hello Registered User Join Date: Mar 2011 Posts: 4,938	Someone was having subtitle problems here. I don't know if it's related. http://forum.doom9.org/showthread.ph...68#post1686268

23rd July 2014, 02:33	#7 \| Link
foxyshadis Angel of Night Join Date: Nov 2004 Location: Tangled in the silks Posts: 9,562	There are a variety of mutually-incompatible versions of formatted TTXT (TTML is supported here and there), I don't know if iOS supports any of them. HTML-formatted SRT files are a proprietary extension from VobSub/VSFilter, nothing else reads them but AegiSub, although there's a WebVTT that's similar but stuck in draft hell. Running yours through AegiSub will handily convert to ASS, then you can upload to Subtitle Converter and mux to see if iOS supports the creaky standard TTML. GPAC will mux that if you rename it to .ttxt. Problem is that site isn't very stable, and the only other converter I can find is payware called EZTitles. Not much ttxt authoring support in the open source world.

6th August 2014, 14:14	#15 \| Link
Kurtnoise Swallowed in the Sea Join Date: Oct 2002 Location: Aix-en-Provence, France Posts: 5,191	http://www.mediafire.com/download/16...ample_ttxt.m4v

6th August 2014, 14:24	#16 \| Link
SeeMoreDigital Life's clearer in 4K UHD Join Date: Jun 2003 Location: Notts, UK Posts: 12,279	Many thanks __________________ \| I've been testing hardware media playback devices and software A/V encoders and decoders since 2001 \| My Network Layout & A/V Gear \|

6th August 2014, 17:48	#17 \| Link
SeeMoreDigital Life's clearer in 4K UHD Join Date: Jun 2003 Location: Notts, UK Posts: 12,279	Hi Kurtnoise, I've tried using Yamb to de-mux the ttxt stream from the sample you provided. But the ttxt stream was not visible! Do you have a version of MP4box that works? __________________ \| I've been testing hardware media playback devices and software A/V encoders and decoders since 2001 \| My Network Layout & A/V Gear \| Last edited by SeeMoreDigital; 6th August 2014 at 18:36.

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