Hi,
Robert Osfield wrote:
Hi J.P,
I'm currently looking at introducing using of sws_scale, but don't
find these methods in the ffmpeg I built. Looking at the links to the
mailing list thread you provided I could quite work out whether these
methods require the sws library to be built, or whether there would be
sws_ functions in other ffmpeg libs, and if so then would have to
guess that they are only in an svn rev later/earlier than the one I
have.
Could you provide any more clarity on which rev of ffmpeg I'd need +
and what build options.
The one I compiled with LGPL only, has the sws functions in libavcodec.so.
nm ./libavcodec/libavcodec.so | grep sws
0008c1b0 T sws_freeContext
0008d1f0 T sws_getCachedContext
0008d0f0 T sws_getContext
0008caf0 T sws_scale
I compiled it using the debian source from:
http://www.debian-multimedia.org/
So I recompiled the debian package (not straight from svn). The source
package was called ffmpegcvs-20090128. I don't think it differs too much
from the svn repo.
I disabled the following in the debian rules file:
swscaler, gpl, postproc, x264, faad
I also paste my instructions I saved for myself at the bottom.
My aim is to be able to use off the self
versions of ffmpeg from linux repositories as well svn versions of
ffmpeg.
This is going to depend a lot on what the repositories compile by
default. I know the debian ones from http://www.debian-multimedia.org/
has swscaler compiled in by default. So has the ubuntu packages if I
remember correctly. A guy here that uses gentoo does not have swscale,
but has the lgpl version.
To cover everything we would need to check:
if (img_resample available) {
use it (Tanguys code)
do not link to swscale
} else {
use swscale
if (swscale in libavcodec) {
do not link to swscale
} else {
link to swscale
}
}
The img_resample check can prob be made by using ffmpeg version info
from the headers.
I'm not certain how to check for where swscale lives.
jp
---8<---
compile lgpl only version
set sources:
deb-src http://www.debian-multimedia.org/ sid main
mkdir ffmpeg-lgpl
cd ffmpeg-lgpl
sudo apt-get source ffmpeg
cd ffmpegcvs-20090128/debian
edit 'rules' and remove --enable-swscaler and --enable-gpl and
--enable-postproc and x264 and faad
edit 'control' and remove libswscale packages
$ cd ..
get build deps
$ sudo apt-get build-dep ffmpeg
build
$ sudo dpkg-buildpackage -uc -b
One gotcha, we need the swscale header to be installed even in
libswscale is not installed. The header is LGPL tho.
---8<---
Robert.
--
This message is subject to the CSIR's copyright terms and conditions, e-mail legal notice, and implemented Open Document Format (ODF) standard.
The full disclaimer details can be found at http://www.csir.co.za/disclaimer.html.
This message has been scanned for viruses and dangerous content by MailScanner,
and is believed to be clean. MailScanner thanks Transtec Computers for their support.
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
