Jon has left a new comment on the post "Sony Walkman X-Series 32GB NWZ-X1060 review":
Try PSP Video 9. Make sure you set the resolution to 320x240 encoded using AVC Baseline Profile 1.3, or just select this default setting: "Fw2.00+ AVC 320x240 768kbps Stereo/128kbps". Transencoding your videos with that setting ought to make them compatible with the X-series.
h.264 is also supported but again only at 320x240. File extension would be either mp4 or m4v.
