[[resending to list as it bounced the first time due to >30K length]]
Loki Davison <loki.davison@email-addr-hidden>:
> digital camera then try and sync the audio afterwards or what? What
> video recording apps work with jack?
One simple possibility: use whatever you'd use to record and transfer video
into mp4/etc and then use xjadeo/qjadeo for playback sync'd with an external
sequencer/daw. (I use the one from PlanetCCRMA:
http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetccrma/12/i386/repoview/xjadeo.html
http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetccrma/12/x86_64/repoview/xjadeo.html
)
Installed Packages
Name : xjadeo
Arch : x86_64
Version : 0.4.7
Release : 1.svn200.fc12.ccrma
Size : 356 k
Repo : installed
From repo : /xjadeo-0.4.7-1.svn200.fc12.ccrma.x86_64
Summary : Very simple video player that gets sync from Jack
URL : http://sourceforge.net/projects/xjadeo
License : GPL
Description: Xjadeo is a very simple video player that gets sync from jack.
> When
: a sequencer like Muse or Rosegarden acts as a timebase master,
: xjadeo will display the video frame in sync with the sequencer
: transport. This means that you can visually synchronize an
> audio
: event with a certain frame in the movie, which comes quite
> handy
: when you want to create a soundtrack for a video clip.
> > rpm -ql xjadeo
/usr/bin/qjadeo
/usr/bin/xjadeo
/usr/bin/xjinfo
/usr/bin/xjremote
/usr/share/doc/xjadeo-0.4.7
/usr/share/doc/xjadeo-0.4.7/AUTHORS
/usr/share/doc/xjadeo-0.4.7/COPYING
/usr/share/doc/xjadeo-0.4.7/ChangeLog
/usr/share/doc/xjadeo-0.4.7/NEWS
/usr/share/doc/xjadeo-0.4.7/README
/usr/share/doc/xjadeo-0.4.7/TODO
/usr/share/man/man1/qjadeo.1.gz
/usr/share/man/man1/xjadeo.1.gz
/usr/share/man/man1/xjinfo.1.gz
/usr/share/man/man1/xjremote.1.gz
/usr/share/qjadeo/locale/qjadeo_fr.qm
One potential issue w/ xjadeo is that it appears to puke on some HD content
that ffmpeg-based playback has no problem with. For example when I record
off digital cable, it fails to recognize or read the files, even though
ffmpeg says they're "ok" (modulo "Seems stream 0 codec frame rate differs
from container frame rate: 59.94 (60000/1001) -> 29.97 (30000/1001)" and
"Seems stream 2 codec frame rate differs from container frame rate: inf
(1/0) -> -nan (0/0)" :-) ).... Transcoding "off the air" files recorded in,
e.g. mythtv, fixes the issue:
> xjinfo Videos/India_Music_Voyager_PBS.mpg
Videos/India_Music_Voyager_PBS.mpg: Error while opening file
> ffmpeg -i Videos/India_Music_Voyager_PBS.mpg
FFmpeg version SVN-r20372, Copyright (c) 2000-2009 Fabrice Bellard, et al.
built on Nov 7 2009 10:57:27 with gcc 4.4.2 20091027 (Red Hat 4.4.2-7)
...
Seems stream 0 codec frame rate differs from container frame rate: 59.94
> (60000/1001) -> 29.97 (30000/1001)
Seems stream 2 codec frame rate differs from container frame rate: inf (1/0)
> -> -nan (0/0)
Input #0, mpegts, from 'Videos/India_Music_Voyager_PBS.mpg':
Duration: 00:27:50.47, start: 34145.227389, bitrate: 3363 kb/s
Program 1
Stream #0.0[0x940]: Video: mpeg2video, yuv420p, 544x480 [PAR 20:17 DAR
> 4:3], 15000 kb/s, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0.1[0x941](eng): Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
Stream #0.2[0x9c0]: Video: mpeg2video, 90k tbn
Stream #0.3[0x9c1](spa): Audio: ac3, 0 channels, s16
It happily decodes just about everything else, and its 'xjinfo' utility
gives me some useful XML to boot:
Niels
http://nielsmayer.com
PS: speaking of extracting structured information from videos && before i
have to cobble together my own: does anybody know of a lib that extracts
captions and caption-timing information from videos and outputs some nice
structured output (e.g. timedtext, SMIL)?? And also the same API should
transparently allow access to YouTube's Google-voice-based automatic caption
extractor (
http://www.digitaltrends.com/computing/software-computing/youtube-opens-automatic-captioning-to-everyone/
...
http://code.google.com/apis/youtube/2.0/developers_guide_protocol_captions.html
)
Even if it's imprecise/hilarious, it's also a giant onset-detection corpora
for a good portion of the internet's video. :-)
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Received on Sun, 9 May 2010 11:05:34 -0700
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