28 Jun
2014
28 Jun
'14
3:46 p.m.
Thanks again Gérald! You know I think this fake 5.1 conversion is really useful.
Someone I work with, Pau, it's in cc of this message. We were talking
yesterday about doing this using your recipe so it can be integrated
in DCP-o-matic. Carl, I'm asking Pau to contact you directly to know
if this is possible, and what to provide.
Only L+R gives a really poor sound experience, and having to through
this extra step doesn't make it allways feasible.
I was proposing this remixing scenarios if whenever this arrives to DCP-o-matic:
-2.1 for the purists that doesn't want any change, just adding the
bass missing in screen speakers
-3.1 same but some mixing in the center channel, filling the empty
sound spot in the middle of the screen
-5.1 with phase inversion, the results are incredible and really
useful for many documentary and small productions
-5.1 musical or other options as proposed by other users.
It's nice to see so many active and helpful people around this
project. I will be trying to convince someone else that it's working
with subtitles to add some options to DCP-o-matic or a companion
software, that's my major requirement right now and the least
developed in open source software for DCP.
Thanks!
Manuel AC
On Sat, Jun 28, 2014 at 3:50 PM, Gérald Maruccia
<gerald.maruccia(a)yahoo.fr> wrote:
Hi everyone !
Here is my latest fabulous script.
It now takes a stereo video file as input and outputs one video file with 6
channels ready to use in dcp-o-matic. It does not "change" video settings,
only copy.
It uses sox and ffmpeg so checks if they are present on system and
eventually install them.
Because of that, it will work only on Ubuntu and derivatives (mint,
elementary a.s.o.) as it installs ffmpeg from Jon Sverrinson ppa on
launchpad.
(but the settings of sox and ffmpeg can be re-used anywhere else !)
There are 3 styles of upmixing :
1 - only dispatches bands of frequencies amongst 6 channels : it's a "soft"
way which never gave (me) bad surprise.
2 - dispatches band of frequencies + mixes : quite "boom-boom" style which
fit well for music, concerts, video clips. Not really good for movies as
there is "much" sound on every channel.
3 - a little more complex, dispatches band of frequencies, uses phase
inversion, delay : nice results so far (for me). Former version used a too
low peak level - because of phase inversion.
(more explanation about how and where I've found informations following the
links provided at the beginning of the script, mostly in french, sorry)
At the end of the process, it will ask if you want to save all the temporary
files allowing to deal with each separate channels, the "dumb" video and
others files created during the process.
So why do I post this again ? It needs improvements :
- when using the script, you have to be in the same folder as your initial
video, and the paths and files names must be without spaces and other
special characters. You also have to specify the output extension .mov
It seems to me more convenient to enter entire path to file(s) but not
skilled enough yet.
- it's only (fake) 5.1 channels, but is 7.1 usefull when upmixing from
stereo ?
- a "zenity" graphical version of this script might be easier to use but
might not work everywhere and once again I'm not skilled enough for the
moment.
- the output file is not seen as a 5.1 in audio properties. I guess it's
relative to -map in ffmpeg but what I've tested until now was not good.
- it's written in french
Thanks for reading, and don't hesitate to contact me, all suggestions and
pieces of advice welcome !
Still hope my english is understandable…
Best regards,
Gérald
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