xvid MPEG4 codec support

[Antoine Martin]

Related to #1107.

The ​xvid codec does MPEG4 and is available in Fedora.

[Antoine Martin]

xvid codec added in r12119, can be enabled using --encoding=mpeg4.
Requires a new build of ffmpeg (with mpeg4 decoding support) and xpra build against xvidcore-devel.

Still TODO:

• packaging updates: rpm and deb build dependencies
• win32 and osx build updates
• remove the xvid encode statistics overlayed on top of the video (but make it possible to re-enable them for debugging - could be quite useful)

[Antoine Martin]

r12125 adds packaging for all platforms except for win32 and osx as servers

This will do for now, not sure if it will help at all with container formats, but it may still help in some other ways (comparing with h264, legacy clients, etc)

How to check for this new codec:

• new "mpeg 4" encoding in the system tray (assuming both the client and server builds have support for it)
• loader.py (aka "Encoding info" exe) will show "mpeg4" under encodings for "dec_avcodec2" when ran with "-v"
• xpra attach --encoding=help
• xpra start --encoding=help

@afarr: just a FYI, feel free to close.

[Antoine Martin]

none of the development packages include a pkg-config file, so I made one (we use pkg-config to detect if the xvid development headers are installed)

[alas]

Interestingly, I find an xvid directory in my v0.17.x src, but not in my trunk (0.18.x), on the vm where I build xpra.

I'm not quite sure how to build a 0.17.x server that will include the mpeg4 (it doesn't show on my --encoder=help list for the server, though it does show on the list for the win32 client I downloaded from your repo).

Loader.py is giving me this output:

* csc_cython           : /usr/lib64/python2.7/site-packages/xpra/codecs/csc_cython/colorspace_converter.so
* csc_libyuv           :
* csc_opencl           :
* csc_opencv           : /usr/lib64/python2.7/site-packages/xpra/codecs/csc_opencv/colorspace_converter.pyc
* csc_swscale          : /usr/lib64/python2.7/site-packages/xpra/codecs/csc_swscale/colorspace_converter.so
* dec_avcodec2         : /usr/lib64/python2.7/site-packages/xpra/codecs/dec_avcodec2/decoder.so
* dec_pillow           : /usr/lib64/python2.7/site-packages/xpra/codecs/pillow/decode.pyc
* dec_vpx              : /usr/lib64/python2.7/site-packages/xpra/codecs/vpx/decoder.so
* dec_webp             : /usr/lib64/python2.7/site-packages/xpra/codecs/webp/decode.so
* enc_pillow           : /usr/lib64/python2.7/site-packages/xpra/codecs/pillow/encode.pyc
* enc_vpx              : /usr/lib64/python2.7/site-packages/xpra/codecs/vpx/encoder.so
* enc_webp             : /usr/lib64/python2.7/site-packages/xpra/codecs/webp/encode.so
* enc_x264             : /usr/lib64/python2.7/site-packages/xpra/codecs/enc_x264/encoder.so
* enc_x265             :
* nvenc4               :
* nvenc5               :
* nvenc6               :
* xvid                 :

codecs versions:
* PIL                             : 3.1.1
* avcodec2                        : 57.24.102
* buffer_api                      : 1
* cython                          : 1.0.24
* dec_pillow                      : 3.1.1
* dec_webp                        : 0.4.4
* enc_pillow                      : 3.1.1
* enc_webp                        : 0.4.4
* numpy                           : 1.9.2
* opencv                          : 2.4.12.2
* swscale                         : 4.0.100
* vpx                             : 1.5.0
* x264                            : 148

I'm not sure the mpeg 4 is meant to be built into a server unless I take some steps (I tried installing xvidcore-devel, but that alone wasn't sufficient).

I will go ahead and close and see is smo maybe has a tip for where that xvid.pc should be dropped in order to enable the mpeg 4... and open some other ticket if my failures persist.

[Antoine Martin]

To build the xvid codec, you need to drop the attachment/ticket/1142/xvid.pc into your pkg-config directory (ie: /usr/lib64/pkgconfig/).

[alas]

Sure enough, dropping it there it worked without a hitch.

I do notice that the xvid encode statistics are still displaying, but I assume you're aware. (Leaving closed.)