TheoraPlay - simple Theora playback lib

Hi, has anybody checked this out?

http://icculus.org/theoraplay/

Quote: TheoraPlay is a simple library to make decoding of Ogg Theora videos easier.

---

It looks like it could be very useful.

Cheers,
Kyungjoon Lee

Re: Newbie Question: Seeking on remote .ogg files (audio)

(Replying to list in addition to you)

I was able to seek in this file without any problem.  I didn't try the
MP3.  I am using Firefox 5.  Can you verify that you're having the
problem with this same file on this server?

On 11/30/2011 03:37 PM, Rich Caloggero wrote:
> *>The problem may reside, however, on the server, if it does not support
> range-request headers.  Was the MP3 on the same server as the Ogg file
> you were testing with?
>
> Hmm, I'm no apache expert and its been a few years since I set it up,
> but its pretty much running a standard apache2 server. Can you point
> me to some place where I can find out how to tell apache to send the
> headers?
>
> *>P.S.  If the file is something you can provide a link to, that would
> make it easier for others to help find the source of the problem.
>
> Here are links to two files, one .mp3 and one .ogg living on my server
> (not the same file, but should be ok for this purpose):
>
> http://narita.mit.edu/theora/file.ogg
>
> http://narita.mit.edu/theora/file.mp3
>
> Thanx very much for your response.
> -- Rich
>
>

Newbie Question: Seeking on remote .ogg files (audio)

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Re: Changing frame rate in an ogg

On 25 August 2011 23:57, Stefano Luceri <stefano.luceri <at> agilex.it> wrote:

> Reading theora documentation it seems that frame rate (FRN and FRD) only
> affects granulepos/timestamp but changing it (manually) in the ogg files
> causes bad decoded frames while playing (I’ve also tried other ogg videos).

Two things:

Theora is strictly fixed frame rate. If the incoming video data is not
at a fixed frame rate, then your encoder will need to check against
the playback clock and duplicate or drop frames to make it so. Since
RTP has per-packet timestamps, this can be relaxed to simplify the
sender implementation, but once saved to an Ogg file, all players will
treat the stream as fixed frame rate. This is likely the reason your
file doesn't behave as you expect.

If you just want to adjust the frame rate of an already saved file,
you could try the little 'rogg_theora' utility I wrote.

  http://downloads.xiph.org/releases/rogg/rogg-0.4.tar.gz

Be aware that it doesn't support Ogg chains or files over 2 GB on 32
bit systems.

 -r
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Changing frame rate in an ogg

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Reading audio data from an .ogv video

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Re: Ripping theora stream

On 08/17/2011 09:34 AM, Stefano Luceri wrote:
> Now I've the following problem, playing the ogg file is very fast, is there
> a way in theora to 'control' frame rate?

The frame rate is written in the setup header.  You should check that
frame rate and see if it is correct.  One possibility is that the
transmitter is lying to you about the frame rate.  Another possibility is
that some frames are getting lost (RTP is a lossy protocol).  When a frame
is lost, you should probably insert an empty (size 0) packet in the Ogg
stream so that you don't lose temporal synchronization.

> Moreover my next step consists in muxing audio/video (I can save it as a
> separate WAV for now), what tool or library do you suggest for muxing?

You can do the muxing using liboggz (it's not much more code than you have
already).

--Ben

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Re: Ripping theora stream

Thanks to #theora IRC channel I've ripped the RTP/THEORA packet stream to an
ogg file.
I used liboggz to write packet content (oggz_write_feed function).
The only problem I've found is related to header packets since rtp_theora
specification
(http://svn.xiph.org/trunk/theora/doc/draft-ietf-avt-rtp-theora-00.txt)
suggests to merge identification header and setup header in a single rtp
packet payload suppressing the comment one. 
Solution to this problem is trivial:
1) Extract identification header it has a fixed length (42) and write it
down using oggz_write_feed
2) Create a dummy comment header:
	Theora_comment tcom;
	ogg_packet op_header_comment;

	theora_comment_init(&tcom);
	theora_encode_comment(&tcom, &op_header_comment)
	
	// and write it down using oggz_write_feed

3) Extract setup header (the remaining playload from 1)) and write it using
oggz_write_feed

Now I've the following problem, playing the ogg file is very fast, is there
a way in theora to 'control' frame rate?
Moreover my next step consists in muxing audio/video (I can save it as a
separate WAV for now), what tool or library do you suggest for muxing?

Thank you,

Stefano

> Hi,
>
> I'm new to this mailing list. I'm trying to save a theora stream into an
OGG file (or something else). I've the theora packets received from a VoIp
application > (over RTP). I'm able to convert a single frame to a jpeg image
but I've no idea about how to write video file.
> Maybe this is not the right place to answer this question but I'm loosing
my mind reading specs about file formats and conversion tools . any help
appreciated.

> Thank you very much

OGG Theora streaming

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Seeking with Theora

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Ripping theora stream

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