olly 2c20689237 Don't fail if we find a track is unsupported
Use AUDIO_UNKNOWN instead. This is in line with our handling
of video tracks with VIDEO_UNKNOWN.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=157209428
2017-05-31 11:31:44 +01:00
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