[John Farrell] “although I haven’t worked with windows media players. “
Do you mean Windows Media Player such as WMP11?
I take it you mean devices like Zune (iPod type Players that play Windows Media).
See this
https://support.microsoft.com/kb/928192?sd=zune
Looks like it can play .m4v
So it can play files encoded for iPod.
and this has more specifics
https://support.microsoft.com/kb/932614/
We recommend the following settings for playback on a Zune device:
• Width: 320
• Height: 240
• Frame rate: 30 frames per second
• Complexity: Main Profile, variable bit rate (VBR)
• Video bit rate (average): 500,000 bits per second (BPS) to 800,000 BPS
Note This setting is a tradeoff between file size and quality. If you use a setting that is less than 500,000 BPS, the video quality may be too low. If you use a setting that is greater than 800,000 BPS, the file may occupy too much storage space.
• Video Bit Rate (peak): 1,500,000 BPS
• Complexity: Simple Profile, constant bit rate (CBR)
• Video Bit Rate (peak==average): 736,000 BPS
• Audio track of .wmv video file: 128,000 BPS recommended for to limit file size or up to 192,000 BPS to maximize quality, 44.1 kHz sample rate, stereo, CBR