Hi We need a list of fourcc <-> subtitle codecs for nut. Any tips where i can find one? (yes i tried google) -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Breaking DRM is a little like attempting to break through a door even though the window is wide open and the only thing in the house is a bunch of things you dont want and which you would get tomorrow for free anyway
Michael Niedermayer <michaelni@gmx.at> writes:
Hi
We need a list of fourcc <-> subtitle codecs for nut. Any tips where i can find one? (yes i tried google)
If you want to reuse values from another container, maybe MOV has something. AVI doesn't support subtitles, so that can't be used as a reference here (and I still think using AVI as a model for anything is utterly stupid). -- Måns Rullgård mans@mansr.com
On Sun, Mar 02, 2008 at 11:33:47PM +0000, Måns Rullgård wrote:
Michael Niedermayer <michaelni@gmx.at> writes:
Hi
We need a list of fourcc <-> subtitle codecs for nut. Any tips where i can find one? (yes i tried google)
If you want to reuse values from another container, maybe MOV has something.
our mov demuxer only has: const AVCodecTag ff_codec_movsubtitle_tags[] = { { CODEC_ID_MOV_TEXT, MKTAG('t', 'e', 'x', 't') }, { CODEC_ID_MOV_TEXT, MKTAG('t', 'x', '3', 'g') }, { CODEC_ID_NONE, 0 }, }; (the rest has to be detected by other messy ways ...) and the spec says: "The data format field in the sample description is always set to 'text'." so i dont see how this could be used ...
AVI doesn't support subtitles, so that can't be used as a reference here (and I still think using AVI as a model for anything is utterly stupid).
Ironically avi is pretty much the only container with simple and working codec identification. In .mp4 we couldnt even agree which value identifies the codec :) mpeg-ps/ts has a dozen identifiers and tables but all of them together are insufficient to distingish h.264 from mpeg2 in practice. ogg leaves codec identification to the codec (aka it has no codec identification) Whats left is mov (which is kinda similar to avi) and dozens of formats which only support a single codec thus dont need a identification system. And of course matroska which has a dozen different id systems. [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Those who are too smart to engage in politics are punished by being governed by those who are dumber. -- Plato
Michael Niedermayer <michaelni@gmx.at> writes:
On Sun, Mar 02, 2008 at 11:33:47PM +0000, Måns Rullgård wrote:
Michael Niedermayer <michaelni@gmx.at> writes:
Hi
We need a list of fourcc <-> subtitle codecs for nut. Any tips where i can find one? (yes i tried google)
If you want to reuse values from another container, maybe MOV has something.
our mov demuxer only has: const AVCodecTag ff_codec_movsubtitle_tags[] = { { CODEC_ID_MOV_TEXT, MKTAG('t', 'e', 'x', 't') }, { CODEC_ID_MOV_TEXT, MKTAG('t', 'x', '3', 'g') }, { CODEC_ID_NONE, 0 }, }; (the rest has to be detected by other messy ways ...)
and the spec says: "The data format field in the sample description is always set to 'text'."
so i dont see how this could be used ...
I didn't look at the spec. I just couldn't thing of any other format using 32-bit codec tags and supporting subtitles at all.
AVI doesn't support subtitles, so that can't be used as a reference here (and I still think using AVI as a model for anything is utterly stupid).
Ironically avi is pretty much the only container with simple and working codec identification.
ROTFL
In .mp4 we couldnt even agree which value identifies the codec :)
Do you mean MP4 or MOV? MP4 is much cleaner than MOV, although I admit I've never read the specs carefully.
mpeg-ps/ts has a dozen identifiers and tables but all of them together
Er, no. TS has one table, PS has a slightly different table using the same values. PS also defaults to MPEG2 if the PSM is missing. No problems there.
are insufficient to distingish h.264 from mpeg2 in practice.
Only with bastardised versions violating the specs. The files you're thinking of are no different in principle from an AVI with the wrong codec tag in the header.
ogg leaves codec identification to the codec (aka it has no codec identification) Whats left is mov (which is kinda similar to avi) and dozens of formats which only support a single codec thus dont need a identification system. And of course matroska which has a dozen different id systems.
AVI and MOV are fundamentally flawed because they muddle the distinction between codec specification and implementation. I agree the other formats you mention are messy. -- Måns Rullgård mans@mansr.com
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Måns Rullgård