Re: [LAU] Making videos with jack and a webcam or something else, band recording.

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To: <linux-audio-user@...>
Date: Sunday, May 9, 2010 - 6:43 pm

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for me to record a music video I would:

- buy a Canon 550d (t2i) and record at 25p (or 24p -24 progressive frames -
if you are from the states) recording the sound with the camera
- at the same time record sound with a jackd
- use kdenlive to transcode video to dnxhd
- in kdenlive, sync the camera sound with the master from the jackd app
- delete camera sound, and render the final video.

(use a gooooooooood PC if you doin' full HD recordings)

Atentamente, Jorge Salgueiro (Incitec S.L.)
______________________________________
Use GNU/Linux: free culture for a free society

2010/5/9 Niels Mayer

> [[resending to list as it bounced the first time due to >30K length]]

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for me to record a music video I would:- buy a Canon 55=
0d (t2i) and record at 25p (or 24p -24 progressive frames - if you are from=
the states) recording the sound with the camera=A0- at the same=
time record sound with a jackd=A0

- use kdenlive to transcode video to dnxhd- in kdenlive, sy=
nc the camera sound with the master from the jackd app- delete c=
amera sound, and render the final video.(use a go=
oooooooood PC if you doin' full HD recordings)

Atentamente, =A0 =A0 Jorge Salgueiro =
(Incitec S.L.)______________________________________Use GNU/Linux: =
free culture for a free society
2010/5/9 Niels Mayer &=
lt;nielsmayer@gmail.com>

[[resending to list as it bounced the first time due to >30K length=
]]Loki Davison <loki.davison@gmail.com>:

digital=A0camera then try and sync the audio afterwards or what? What video=
=A0recording apps work with jack?One simpl=
e possibility: use whatever you'd use to record and transfer video into=
mp4/etc and then use=A0xjadeo/qjadeo for playback sync'd with an exter=
nal sequencer/daw. (I use the one from PlanetCCRMA:=A0http://cc=
rma.stanford.edu/planetccrma/mirror/fedora/linux/planetccrma/12/i386/repovi=
ew/xjadeo.html
=A0

http://ccrma.stanford.edu/planetccrma/mirror/fedora/linu=
x/planetccrma/12/x86_64/repoview/xjadeo.html
=A0)

Installed Packages

Name =A0 =A0 =A0 : xjadeo

Arch =A0 =A0 =A0 : x86_64

Version =A0 =A0: 0.4.7

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

Size =A0 =A0 =A0 : 356 k

Repo =A0 =A0 =A0 : installed

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

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

URL =A0 =A0 =A0 =A0:=A0http://sourceforge.net/pr=
ojects/xjadeo

License =A0 =A0: GPL

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

=A0=A0 =A0 =A0 =A0 =A0 : a sequencer like Muse or Rosegarden acts as a time=
base master,

=A0=A0 =A0 =A0 =A0 =A0 : xjadeo will display the video frame in sync with t=
he sequencer

=A0=A0 =A0 =A0 =A0 =A0 : transport. This means that you can visually synchr=
onize an audio

=A0=A0 =A0 =A0 =A0 =A0 : event with a certain frame in the movie, which com=
es quite handy

=A0=A0 =A0 =A0 =A0 =A0 : when you want to create a soundtrack for a video c=
lip.

> 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.=A0For 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 r=
ate differs from container frame rate: 59.94 (60000/1001) -> 29.97 (3000=
0/1001)" and "Seems stream 2 codec frame rate differs from contai=
ner frame rate: inf (1/0) -> -nan (0/0)" :-)=A0).... Transcoding &q=
uot;off the air" files recorded in, e.g. mythtv, fixes the issue:

> xjinfo=A0Videos/India_Music_Voyager_PBS.mpg

Videos/India_Music_Voyager_PBS.mpg: Error while opening f=
ile

> ffmpeg -i=A0Videos/India_Music_Voyager_PBS.mpg

FFmpeg version SVN-r20372, Copyright (c) 2000-2009 Fabrice Bellard, et al.<=
/blockquote>

=A0=A0built on Nov =A07 2009 10:57:27 with gcc 4.4.2 20091027 (Red Hat 4.4.=
2-7)

=A0=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/India_Music_Voyager_PB=
S.mpg':

=A0=A0Duration: 00:27:50.47, start: 34145.227389, bitrate: 3363 kb/s

=A0=A0Program 1=A0

=A0=A0 =A0Stream #0.0[0x940]: Video: mpeg2video, yuv420p, 544x480 [PAR 20:1=
7 DAR 4:3], 15000 kb/s, 29.97 tbr, 90k tbn, 59.94 tbc

=A0=A0 =A0Stream #0.1[0x941](eng): Audio: ac3, 48000 Hz, stereo, s16, 192 k=
b/s

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

=A0=A0 =A0Stream #0.3[0x9c1](spa): Audio: ac3, 0 channels, s16=
It happily decodes just about everything else, an=
d its 'xjinfo' utility gives me some useful XML to boot:=

=A0Nielshttp://nielsmayer.com=
PS: speaking of extracting structured information from=
=A0videos=A0&& before i have to cobble together m=
y own: does anybody know of a lib that extracts captions and caption-timing=
information from=A0videos=A0and outputs some nice struct=
ured output (e.g. timedtext, SMIL)?? And also the same API should transpare=
ntly allow access to YouTube's Google-voice-based automatic caption ext=
ractor (=A0http://www.digitaltrends.com/computing/softwa=
re-computing/youtube-opens-automatic-captioning-to-everyone/
=A0...=A0http://co=
de.google.com/apis/youtube/2.0/developers_guide_protocol_captions.html
=
=A0) Even if it's imprecise/hilarious, it's also a giant onset-dete=
ction corpora for a good portion of the internet's video. :-)

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Re: [LAU] Making videos with jack and a webcam or something ..., Jorge Salgueiro, (Sun May 9, 6:43 pm)