code:
vcodec=<value>
Employ the specified codec (default: mpeg4).
mjpeg Motion JPEG
ljpeg Lossless JPEG
h263 H.263
h263p H.263+
mpeg4 MPEG-4 (DivX 4/5)
msmpeg4 DivX 3
msmpeg4v2 MS MPEG4v2
wmv1 Windows Media Video, version 1 (AKA WMV7)
wmv2 Windows Media Video, version 2 (AKA WMV8)
rv10 an old RealVideo codec
mpeg1video MPEG-1 video
mpeg2video MPEG-2 video
huffyuv HuffYUV
asv1 ASUS Video v1
asv2 ASUS Video v2
ffv1 FFmpeg’s lossless video codec