[youtube] new formats 266,298,299 seem to be DASH mp4's just like other DASH mp4's

[sdsucks]

why does youtube-dl say they are mov's?

format code extension resolution note
139 m4a audio only DASH audio 49k , audio@ 48k (22050Hz), 1.20MiB (worst)
140 m4a audio only DASH audio 129k , audio@128k (44100Hz), 3.20MiB
141 m4a audio only DASH audio 255k , audio@256k (44100Hz), 6.36MiB
160 mp4 82x144 DASH video 111k , video only, 2.72MiB
133 mp4 136x240 DASH video 247k , video only, 6.09MiB
134 mp4 202x360 DASH video 386k , video only, 7.46MiB
135 mp4 270x480 DASH video 719k , video only, 15.22MiB
298 mov 406x720 DASH video 1931k , h264, 60fps, video only, 44.73MiB
136 mp4 406x720 DASH video 1319k , video only, 30.22MiB
299 mov 608x1080 DASH video 3291k , h264, 60fps, video only, 76.25MiB
137 mp4 608x1080 DASH video 2486k , video only, 57.14MiB
264 mp4 810x1440 DASH video 5793k , video only, 136.85MiB
266 mov 1080x2160 DASH video 10784k , h264, video only, 248.42MiB
138 mp4 1080x2160 DASH video 12560k , video only, 259.33MiB

[phihag]

mplayer identified them as such:

$ mplayer -vo null -ao null -identify * | grep ^Detected
Detected file format: QuickTime / MOV (libavformat)

It seems that a more appropriate extension would be m4v, but for now, I've just changed everything to mp4.