linuxaudio.org

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Loki Davison :
> digital camera then try and sync the audio afterwards or what? What

quoted text
> 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...
http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetccrma/12...

 )
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.

quoted text
> 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

quoted text
> audio

           : event with a certain frame in the movie, which comes quite

quoted text
> 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

quoted text
> (60000/1001) -> 29.97 (30000/1001)

Seems stream 2 codec frame rate differs from container frame rate: inf (1/0)

quoted text
> -> -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

quoted text
> 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-...

 ...

http://code.google.com/apis/youtube/2.0/developers_guide_protocol_captio...

)

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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Content-Type: text/html; charset=UTF-8

Content-Transfer-Encoding: quoted-printable
[[resending to list as it bounced the first time due to >30K length=

]]Loki Davison <loki.davi=

son@gmail.com>:
digital=C2=A0camera then try and sync the audio afterwards or what? What vi=

deo=C2=A0recording apps work with jack?One=

 simple possibility: use whatever you'd use to record and transfer vide=

o into mp4/etc and then use=C2=A0xjadeo/qjadeo for playback sync'd with=

 an external sequencer/daw. (I use the one from PlanetCCRMA:=C2=A0http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetccr=

ma/12/i386/repoview/xjadeo.html=C2=A0

http://ccrma.stanford.edu/planetccrma/mirror/fedora/l=

inux/planetccrma/12/x86_64/repoview/xjadeo.html=C2=A0)
Installed Packages

Name =C2=A0 =C2=A0 =C2=A0 : xjadeo

Arch =C2=A0 =C2=A0 =C2=A0 : x86_64

Version =C2=A0 =C2=A0: 0.4.7

Release =C2=A0 =C2=A0: 1.svn200.fc12.ccrma

Size =C2=A0 =C2=A0 =C2=A0 : 356 k

Repo =C2=A0 =C2=A0 =C2=A0 : installed

quoted text
>From repo =C2=A0: /xjadeo-0.4.7-1.svn200.fc12.ccrma.x86_64

Summary =C2=A0 =C2=A0: Very simple video player that gets sync from Jack

URL =C2=A0 =C2=A0 =C2=A0 =C2=A0:=C2=A0http://=

sourceforge.net/projects/xjadeo

License =C2=A0 =C2=A0: GPL

Description: Xjadeo is a very simple video player that gets sync from jack.=

 When

=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : a sequencer like Muse or Rosegar=

den acts as a timebase master,

=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : xjadeo will display the video fr=

ame in sync with the sequencer

=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : transport. This means that you c=

an visually synchronize an audio

=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : event with a certain frame in th=

e movie, which comes quite handy

=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : when you want to create a soundt=

rack 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.qmOne p=

otential issue w/ xjadeo is that it appears to puke on some HD content that=

 ffmpeg-based playback has no problem with.=C2=A0For example when I record =

off digital cable, it fails to recognize or read the files, even though ffm=

peg says they're "ok" (modulo "Seems stream 0 codec fram=

e rate differs from container frame rate: 59.94 (60000/1001) -> 29.97 (3=

0000/1001)" and "Seems stream 2 codec frame rate differs from con=

tainer frame rate: inf (1/0) -> -nan (0/0)" :-)=C2=A0).... Transcod=

ing "off the air" files recorded in, e.g. mythtv, fixes the issue=

:
> xjinfo=C2=A0Videos/India_Music_Vo=

yager_PBS.mpg
Videos/India_Music_Voyager_PBS.mpg: Er=

ror while opening file
> ffmpeg -i=C2=A0Videos/India_Music=

_Voyager_PBS.mpg
FFmpeg version SVN-r20372, Copyright (c) 2000-2009 Fabrice Bellard, et al.<=

/blockquote>

=C2=A0=C2=A0built on Nov =C2=A07 2009 10:57:27 with gcc 4.4.2 20091027 (Red=

 Hat 4.4.2-7)

=C2=A0=C2=A0...

Seems stream 0 codec frame rate differs from container frame rate: 59.94 (6=

0000/1001) -> 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/Ind=

ia_Music_Voyager_PBS.mpg':
=C2=A0=C2=A0Duration: 00:27:50.47, start: 34145.227389, bitrate: 3363 kb/s<=

/blockquote>

=C2=A0=C2=A0Program 1=C2=A0

=C2=A0=C2=A0 =C2=A0Stream #0.0[0x940]: Video: mpeg2video, yuv420p, 544x480 =

[PAR 20:17 DAR 4:3], 15000 kb/s, 29.97 tbr, 90k tbn, 59.94 tbc=
=C2=A0=C2=A0 =C2=A0Stream #0.1[0x941](eng): Audio: ac3, 48000 Hz, stereo, s=

16, 192 kb/s

=C2=A0=C2=A0 =C2=A0Stream #0.2[0x9c0]: Video: mpeg2video, 90k tbn

=C2=A0=C2=A0 =C2=A0Stream #0.3[0x9c1](spa): Audio: ac3, 0 channels, s16It happily decodes just about everything=

 else, and its 'xjinfo' utility gives me some useful XML to boot:

=C2=A0Nielshttp://nielsmayer.com=

PS: speaking of extracting structured information=

 from=C2=A0videos=C2=A0&& befo=

re i have to cobble together my own: does anybody know of a lib that extrac=

ts captions and caption-timing information from=C2=A0videos=C2=A0and outputs some nice structured output (e.g. ti=

medtext, SMIL)?? And also the same API should transparently allow access to=

 YouTube's Google-voice-based automatic caption extractor (=C2=A0http://www.digitaltrends.com/computing/software-computing/y=

outube-opens-automatic-captioning-to-everyone/=C2=A0...=C2=A0http://code.go=

ogle.com/apis/youtube/2.0/developers_guide_protocol_captions.html=C2=A0=

) Even if it's imprecise/hilarious, it's also a giant onset-detecti=

on corpora for a good portion of the internet's video. :-)
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