Original commit message from CVS:
* ext/ffmpeg/gstffmpegcodecmap.c: (gst_ffmpeg_avpicture_get_size),
(gst_ffmpeg_avpicture_fill), (gst_ffmpeg_img_convert):
* ext/ffmpeg/gstffmpegcodecmap.h:
* ext/ffmpeg/gstffmpegdec.c: (gst_ffmpegdec_chain):
Fix strides and plane sizes when dealing with odd sized
movies.