[M4IF Technotes] Text

[Levantovsky, Vladimir]

I agree with you 100%, the coding of text as an image is both
quality-loosing and bandwidth-consuming technique.
As far as simple text messaging is concerned, current BIFS tools allow to
define "Text" node and "FontStyle" nodes, so it's possible to transmit the
text string and signal font family, style and direction of text rendering. A
text string is supposed to be rendered using one of the default fonts
available in the decoder and, in general, the resulting appearance of the
text string and it's layout will be unknown due to the fact the default
fonts and their metrics are not standardized by MPEG-4. 
If the exact appearance and layout of the text message is required, then it
would be possible to achieve it only if original font information is
embedded in the BIFS stream, which requires decoder to be able to render
specific font format(s). These advanced text support tools are considered to
be added to the MPEG-4 Systems.
I have related question: what is the font rendering capabilities and/or font
format(s) that are currently supported by your decoder?
Thanks,
Vlad
-----Original Message-----
From: the_ether [mailto:the_ether   btinternet.com]
Sent: Monday, September 09, 2023 3:29 PM
To: technotes   lists.m4if.org
Subject: Re: [M4IF Technotes] Text
I just mean that if I have a video with text on it and also know what that
text is, is there anything in MPEG-4 that will allow me to transmit that in
a better way than simply treating it as just an ordinary image? The
block-based technique makes it difficult to read.
So perhaps BIFS allows me to transmit text and the font type so that the
decoder can draw it from scratch, or perhaps I just make sure I use the
smallest block size possible, such as 4x4 in h26L.
----- Original Message ----- 
From: Levantovsky,  <mailto:Vladimir.Levantovsky   AgfaMonotype.com> Vladimir 
To: 'the_ether' <mailto:the_ether   btinternet.com>  ;
technotes   lists.m4if.org <mailto:technotes   lists.m4if.org>  
Sent: Monday, September 09, 2023 8:17 PM
Subject: RE: [M4IF Technotes] Text
Can you please be more specific on what kind of text handling functionality
you are looking for?
Thank you,
Vlad
-----Original Message-----
From: the_ether [mailto:the_ether   btinternet.com]
Sent: Monday, September 09, 2023 2:59 PM
To: technotes   lists.m4if.org <mailto:technotes   lists.m4if.org> 
Subject: [M4IF Technotes] Text
Hi
Is there anything within MPEG-4 to help with handling text?
Regards
graham
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