Displaying 20 results from an estimated 8000 matches similar to: "A/V sync strategies"
2005 Mar 20
2
VCD tracks to theora
Hello,
I am looking for a way to convert VCD tracks to theora.
I'd rather a command line tool.
What would you suggest me?
I already found I can do that with mplayer, by ripping to yuv and wav,
then using the encoder_example to compress to theora, but would there be
another better way?
--
ASPO Infog?rance http://aspo.rktmb.org/activites/infogerance
Unofficial FAQ fcolc
2003 Jun 12
3
A/V sync in Theora
Hi,
I've been thinking about how a Theora encoder could be integrated into
mencoder or transcode and I'm not sure whether I understand the A/V sync
strategy of Theora/Vorbis correctly.
When transcoding from some video format (ie MPEG2 or DivX), at least
some images of the video stream will have time stamps, as well as the
fragments of the audio stream. Or at least time stamps can be
2004 Sep 12
1
using theora
Having built libtheora-1.0alpha3, I tried it out on a 46 second long,
161 MByte raw dv format video clip.
First, I copied these lines from ogg-theora-microhowto.html
<snip>
mplayer -ao pcm -aofile stream.wav -vo null file_to_be_encoded.avi &
mplayer -vo yuv4mpeg -ao null -nosound file_to_be_encoded.avi &
encoder_example -v 1 -a 1 stream.wav stream.yuv > theora_file.ogg
2008 Oct 10
4
ffmpeg2theora 0.22 released
ffmpeg2theora 0.22 is out - http://v2v.cc/~j/ffmpeg2theora
* enable v4l input again (-f video4linux or -f video4linux2)
* ability to set framerate for image sequences (--inputfps)
* fix several memory leaks
* if only width or height are given,
the other is set to preserve aspect ratio
* -start / -end options now work with audio only input
* new option --novideo to disable video
2008 Oct 10
4
ffmpeg2theora 0.22 released
ffmpeg2theora 0.22 is out - http://v2v.cc/~j/ffmpeg2theora
* enable v4l input again (-f video4linux or -f video4linux2)
* ability to set framerate for image sequences (--inputfps)
* fix several memory leaks
* if only width or height are given,
the other is set to preserve aspect ratio
* -start / -end options now work with audio only input
* new option --novideo to disable video
2002 Oct 02
2
Audio from fifo
My first guess about the problem would be that the programs want
to process the stuff in a different order, e.g. mplayer wants to
output some sound before anymore video and encoder_example wants
to receive some video before anymore sound. This could easily
depend on the order of stuff in the file mplayer is reading.
I guess something similar could happen for opening the pipes as
well.
The
2007 Jul 17
3
TS from DVB-T to Theora + Vorbis
Hello,
Could you kindly point me to some instruction, how to encode demuxed
files (.m2v and .mp2) to .ogg (Theora + Vorbis)? I was trying to use
ffmpeg2theora, but I don't know, how to put two files to ffmpeg2theora
(one audio an one video) and did not found, how to mux them into one
file?
Exist a way, how to do two pass encoding?
I'm using Ubuntu Fiesty Linux.
Thank you,
Jiri Navratil
2010 Apr 15
1
Webcam streaming with ptalarbvorm
Hey all! I'm sure you've all been missing my webcam stream, so I
decided to start it up again (also, I wanted to do it for my family
overseas).
However, this time, I'm doing things a little bit differently. For
starters, the encoder is the current (as of about an hour ago)
ptalarbvorm branch which is destined to become libtheora 1.2. Another
difference is that I'm using
2002 Sep 27
2
Using Theora Micro-HOWTO
Okay, thanks to some stubbornness on my part and helpfulness on the part
of people on this mailing list, I got the Ogg Theora alpha compiled up
and installed and running.
Yesterday, I went to the Prelinger archives (the public-domain video
archive at www.archive.com) to find a high-quality original to re-encode
as a test. The encoder worked just fine, and playback as well, and I thought
I'd
2005 Sep 29
1
Quicktime 2 Theora Transcoder's Nano-Howto
After a bunch of cumbersome testing I was able to transcode a Quicktime
MOV file to OGG with theora and Vorbis. The method's a bit fumbly, but
it works... It is automatable except for the initial audio decoding.
Software used: Xine, oggenc, ffmpeg, ffmpeg2theora, oggzmerge
Step 1: Get the video out of Quicktime
ffmpeg -i infile.mov -b 5000 -f mpeg2video outfile.mpg
Step 2: Get the video
2005 Apr 16
6
Video and audio not in sync
I had some shows on tivo that I figured I wanted to keep on a CD in case
I might ever want to watch them again. (Not that you care, butthis
really is for my own personal use. I wouldn't have the bandwidth to
"share" this stuff even if I wanted to.)
So I downloaded a 1 hour show with TiVo ToGo, and I jumped through a few
hoops to "free the mpeg", and I got a nice 2 GB
2006 Jan 03
3
[ANNOUNCE] libshout 2.2 released
libshout 2.2 has just been released. It's a fairly minor update:
* Speex support (this is why it's 2.2 instead of 2.1.1)
* Theora timing fix
* Double-free bug, response parser bug on failed login fixed.
It's at http://www.icecast.org/download.php
2003 Jun 09
2
[PATCH] Fix for YUV4MPEG support in encoder_example
As was briefly discussed on IRC, ffmpeg and mplayer currently output
two somewhat incompatible YUV4MPEG streams. This meant that
encoder_example could take input from mplayer, but not ffmpeg or
movtoy4m (a QuickTime->Y4M tool).
This is a patch that fixes this issue and should allow encoder_example to
take input from either format:
diff -urd xiph-cvs/theora/examples/encoder_example.c
2010 Mar 17
3
encoding raw file (.yuv) using ffmpeg2theora
Hello!
I'm trying to use ffmpeg2theora to encode raw (.yuv) files in I420
format (just frames, no headers at all), but failed to find
corresponding input format. Is there any documentation of supported
formats for ffmpeg2theora?
Or maybe there is another command-line tool for Windows to encode raw
video using Theora algorithm?
Thank you for help!
Alexander.
2004 Dec 03
3
trying to encode from dvd using mplayer
Hello. I'm trying to encode an Ogg Theora file from an unencrypted
dvd using mplayer and encoder_example.
I set up named pipes stream.wav and stream.yuv.
I then run:
mplayer -ao pcm -aofile stream.wav -vo null /dev/dvd &
mplayer -vo yuv4mpeg -ao null -nosound /dev/dvd &
encoder_example -v1 -a 1 stream.wav stream.yuv > lec1.ogg
but I get the following error:
File stream.wav is
2003 Feb 02
2
Encoding from fifo's
Hello, I'm new to the list, so if this is an FAQ, please point me to the
relevant docs.
I'm playing with Theora, to see what kind of quality I can expect (I
realise its not for production use yet). I've download the source from
CVS, and got it to build, with the example encoder and player.
While trying to find something to serve as a good source of input, I
decided I'd use a
2004 Jul 14
4
aspect ratio ?
Can someone enlighten me on what the status is of aspect ratio in theora
is ?
The ti structure has aspect_num and _den values, which I assume give the
intended display aspect ratio (e.g. 4/3).
The sample files on the bittorrent seem to say both values are 0 for all
files. I'd think it should at least be made impossible to have a 0 as
the denominator.
The library doesn't check the
2010 Apr 09
1
Google Puts Weight Behind Theora
"... we need a baseline to work from - one standard format that (if all else
fails) everything can fall back to. This doesn?t need to be the most complex
format, or the most advertised format, or even the format with the most companies
involved in its creation. All it needs to do is to be available, everywhere. The
codec in the frame for this is Ogg Theora..."
:)
2009 Nov 18
2
Move listeners problems
Hi!
I'm using Icecast 2.3.1 (xubuntu Hardy) and have problems moving
listeners. I thought it had to do with the client, but now that I've
tested cortado, mplayer and vlc I've begun to think it is actually the
server. I'm using the web administration interface to move listeners,
get '1' as result code but all clients hang after the buffer is empty.
Any ideas/pointers?
2009 Sep 02
2
issue with encoding of one particular file?
Hello,
I'm using ffmpeg2theora.linux to encode video casts from http://digit.cz
For one particular episode 24, I discovered two issues:
1. minor one - at beginnig, software is reporting very big and long
result
ffmpeg2theora.linux digit24.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'digit24.mp4':
Duration: 00:42:41.04, start: 0.000000, bitrate: 1177 kb/s
Stream #0.0(eng):