Apple iPod touch (Original/1st Gen) 8, 16, 32 GB Specs
https://everymac.com/systems/apple/ipod/specs/ipod-touch-specs.html

"H.264 video, up to 1.5 Mbps, 640 by 480 pixels, 30 frames per second,
Low-Complexity version of the H.264 Baseline Profile with
AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;

H.264 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second,
Baseline Profile up to Level 3.0 with
AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats;

MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second,
Simple Profile with
AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats."

Handbrake dürfte am einfachsten sein