-pvr <option1:option2:...> (PVR only)
 This option tunes various encoding properties of the PVR capture
 module. It has to be used with any hardware MPEG encoder based card
 supported by the V4L2 driver. The Hauppauge WinTV PVR-150/250/350/500
 and all IVTV based cards are known as PVR capture cards. Be aware that
 only Linux 2.6.18 kernel and above is able to handle MPEG stream through
 V4L2 layer. For hardware capture of an MPEG stream and watching it with
 MPlayer/MEncoder, use 'pvr://' as a movie URL.

 Available options are:
aspect=<0-3>
 Specify input aspect ratio:
 0: 1:1
 1: 4:3 (default)
 2: 16:9
 3: 2.21:1
arate=<32000-48000>
 Specify encoding audio rate (default: 48000 Hz, available: 32000,
 44100 and 48000 Hz).
alayer=<1-3>
 Specify MPEG audio layer encoding (default: 2).
abitrate=<32-448>
 Specify audio encoding bitrate in kbps (default: 384).
amode=<value>
 Specify audio encoding mode. Available preset values are 'stereo',
 'joint_stereo', 'dual' and 'mono' (default: stereo).
vbitrate=<value>
 Specify average video bitrate encoding in Mbps (default: 6).
vmode=<value>
 Specify video encoding mode: vbr: Variable BitRate (default)
 cbr: Constant BitRate
vpeak=<value>
 Specify peak video bitrate encoding in Mbps (only useful for VBR
 encoding, default: 9.6).
fmt=<value>
 Choose an MPEG format for encoding: ps: MPEG-2 Program Stream (default)
 ts: MPEG-2 Transport Stream
 mpeg1: MPEG-1 System Stream
 vcd: Video CD compatible stream
 svcd: Super Video CD compatible stream
 dvd: DVD compatible stream