IN PROGRESS: IDLffVideoWrite: Example Linux instructions to replace IDL 8.2 FFmpeg library with user obtained library from FFmpeg web site

Anonym Wednesday, January 2, 2013

==============================================================
Exelis Visual Information Solutions Technical Support:
example instructions to replace FFmpeg libs in 64-bit IDL 8.2
for Linux with user copy obtained from FFmpeg web site.
==============================================================

1.) DOWNLOAD FFMPEG VERSION NEEDED TO MODIFY IDL 8.2

Get the "FFmpeg 0.8.12 "Love"" release ("ffmpeg-0.8.12.tar.gz") from:

http://www.ffmpeg.org/download.html

[ Test download distribution files for Tech Support can be found
on tech support rhel 6.2 test machine under the directory:

~/Downloads/ffmpeg
]

2.) LIBRARY DEPENDENCIES

[ To get the resulting "ffmpeg" executable to run on an Exelis VIS
Tech Support RHEL 6.2 machine required additional installation
of "yasm" package. Had to download rpm file from http://rpmfind.net
and then installed the downloaded rpm package with a command
like:

sudo rpm -install /path/to/yasm-1.2.0-1.el6.x86_64.rpm

Not sure if this lib is needed to use the user-installed libs with
IDL 8.2.
]

3.) UNPACK DISTRIBUTION

gzip -d ./ffmpeg-0.8.12.tar.gz
tar xvf ./ffmpeg-0.8.12.tar

4.) INSTRUCTIONS TO ENABLE x264/H.264 ENCODING

See instructions provided by link on FFmpeg doc page:

http://www.ffmpeg.org/general.html#x264

[ At this time, this step has not been tested and we leave the
details of implementation to the end-user. ]

5.) BUILD/INSTALL INSTRUCTIONS

For general FFmpeg lib build/installation steps read INSTALL file
from unpacked distribution.

6.) CREATE BUILD/INSTALL DIRECTORY

Example commands below assume that destination directory will be
"/sw/util/ffmpeg-0.8.12" with a generic symbolic link directory
name of "ffmpeg".

    sudo mkdir /sw
    sudo mkdir /sw/util
    sudo mkdir /sw/util/ffmpeg-0.8.12
    sudo ln -s /sw/util/ffmpeg-0.8.12 /sw/util/ffmpeg

7.) BUILD AND INSTALL FFMPEG BINARIES

(Destination directory: /sw/utils/ffmpeg)

[ Run "./config --help" from FFmpeg source dir for config options. ]
[ To enable use of x264 module (I assume) you'll also need to
use the following "configure" switches:
--enable-libx264 --enable-gpl
See also step #4 above for installing x264/H.264 support.
]

    cd /path/to/ffmpeg-0.8.12/sourcefiles
    sudo ./configure --prefix=/sw/util/ffmpeg --enable-shared \
    --enable-libx264 --enable-gpl
    sudo make
    sudo make install

[ Note: Building of binaries resulted in lots of warnings but no errors. ]
[ If needed, before configuring/building libraries again, be sure to
issue "make clean" command. ]

8.) REPLACE ORIGINAL IDL LIBS WITH NEW FFMPEG LIBS

cd /usr/local/exelis/idl82/bin/bin.linux.x86_64
sudo mv libavcodec.so.53 libavcodec.so.53.orig
sudo mv libavformat.so.53 libavformat.so.53.orig
sudo mv libavutil.so.51 libavutil.so.51.orig
cd /sw/util/ffmpeg-0.8.12
sudo cp ./libavcodec/libavcodec.so.53* /usr/local/exelis/idl82/bin/bin.linux.x86_64/
sudo cp ./libavformat/libavformat.so.53* /usr/local/exelis/idl82/bin/bin.linux.x86_64/
sudo cp ./libavutil/libavutil.so.51* /usr/local/exelis/idl82/bin/bin.linux.x86_64/

9.) EXAMPLE TEST CODE USING REPLACEMENT FFMPEG LIBS WITH IDL 8.2:

;+
; :Description:
; Exelis VIS Technical Support example IDL program to test the
; use of user-provided FFmpeg libraries with IDL 8.2.
;-
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
PRO test_replace_ffmpeg_libs

; Get the current routine file directory (doesn't work with main level programs)
scope = SCOPE_TRACEBACK(/STRUCT)
thisfilename = (scope[-1]).FILENAME
thisdir = FILE_DIRNAME(thisfilename, /MARK_DIRECTORY)

READ_JPEG, FILE_WHICH('rose.jpg'), img, /TRUE
HELP, img

; Make frame dimensions even
img = CONGRID(img, 3, 228, 150)
PRINT, 'Make frame dimensions even:'
HELP, img

; Parameters for video
width = 228
height = 150
frames = 100
fps = 30

; Codec "wmv2" is not supported by default by
; IDL 8.2 IDLffVideoWrite
fileext = 'avi'
codec = 'wmv2'

; ; Codec "mpeg4" *is* supported by default by
; ; IDL 8.2 IDLffVideoWrite
; fileext = 'mp4'
; codec = 'mpeg4'

file = thisdir + 'myvid.' + fileext

ov = IDLffVideoWrite(file)
codecs = ov.GetCodecs(/VIDEO)

; Check for codec support
found = codecs[WHERE(STREGEX(codecs, codec, /BOOLEAN), /NULL)]
IF N_ELEMENTS(found) NE 0 THEN $
    PRINT, '% '+codec+' supported? > ', found $
ELSE BEGIN
    PRINT, 'Codec "', codec, '" not found. Returning...'
    RETURN
ENDELSE

; Add codec video stream. specified codec won't be
; used if not supported by currently installed ffmpeg libs.
vidstream = ov.AddVideoStream(width, height, fps, CODEC=codec)

; Add video frames
FOR I=0, 99 DO $
    time = ov.Put(vidstream, SHIFT(img, 0, 10*i, 10*i))

ov.Cleanup
OBJ_DESTROY, ov

PRINT, 'Video file created: ' + file
END
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