File this under "old, but we missed it" and since s2gordon asked about them in comments yesterday, figured we'd answer...

We're going to leave this to you folks to determine if this list of officially supported audio and video codecs in Windows Phone 7 is a good thing/bad thing, since to be honest we're not aficionados in that area.

Our off-the-cuff first take? It's basic and expected. Nothing extraordinary. 

Full list of WP7 codecs after the break.

 

Codec Type

Decoder Support

Container

Audio

WAV (PCM, MSADPCM, IMAADPCM, G.711)

WAV

Audio

MP3

MP3

Audio

WMA Lossless

ASF (WMA)

Audio

WMA Pro

ASF (WMA)

Audio

WMA Standard v9

ASF (WMA)

Audio

AAC-LC (Low Complexity)

3GP, 3G2, MP4, M4A

Audio

HE-AAC v1 (AAC+)

3GP, 3G2, MP4, M4A

Audio

HE-AAC v2 (eAAC+)

3GP, 3G2, MP4, M4A

Audio

Adaptive Multi-Rate Narrow Band (AMR-NB)

3GP, 3G2, MP4

Audio

Adaptive Multi-Rate ide Band (AMR-WB)

3GP, 3G2, MP4

Audio

Qcelp

3GP, 3G2, MP4

Video

WMV (VC-1) - Simple Profile

ASF (WMV)

Video

WMV (VC-1) - Main Profile

ASF (WMV)

Video

WMV (VC-1) - Advanced Profile

ASF (WMV)

Video

WMV v9

ASF (WMV)

Video

MPEG-4 Part 2 - Simple Profile

3GP, 3G2, MP4, AVI

Video

MPEG-4 Part 2 – Advanced Simple Profile

AVI, MP4

Video

DivX 4.x/5.x/6.x

AVI

Video

MPEG-4 Part 10 (MPEG-4 AVC, H.264) - Baseline Profile

3GP, 3G2, MP4, M4V

Video

MPEG-4 Part 10 (MPEG-4 AVC, H.264) - Main Profile

3GP, 3G2, MP4, M4V

Video

MPEG-4 Part 10 (MPEG-4 AVC, H.264) - High Profile

3GP, 3G2, MP4, M4V

Video

H.263

3GP, 3G2

Images

JPEG

JPG

Images

PNG

PNG

Images

GIF (both GIF87a and GIF89a)

GIF

[Don's Blog via Midnight Programmer]