AdaptationSet switching with different codecs causes MSE error

[dsilhavy]

Description

When switching between Representations with different codecs (e.g. HEVC and H.264) of different AdaptationSets signaled by "urn:mpeg:dash:adaptation-set-switching:2016" dash.js throws an MSE error. This is likely caused by a missing call to changeType().

Example

    <AdaptationSet id="264" mimeType="video/mp4" frameRate="25/1" segmentAlignment="true" subsegmentAlignment="true" startWithSAP="1" subsegmentStartsWithSAP="1" bitstreamSwitching="false">
	  <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="265"/>
      <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main" />
      <Representation id="1" width="384" height="216" scanType="progressive" bandwidth="235197" codecs="avc1.640014">
        <BaseURL>videos/115045-000-A_x264_CRF20_246_8bits_v216.mp4</BaseURL>
        <SegmentBase indexRange="863-2102">
          <Initialization range="0-862" />
        </SegmentBase>
      </Representation>
     </AdaptationSet>
    <AdaptationSet id="265" mimeType="video/mp4" frameRate="25/1" segmentAlignment="true" subsegmentAlignment="true" startWithSAP="1" subsegmentStartsWithSAP="1" bitstreamSwitching="false">
	  <SupplementalProperty schemeIdUri="urn:mpeg:dash:adaptation-set-switching:2016" value="264"/>
      <Role schemeIdUri="urn:mpeg:dash:role:2011" value="main" />
      <Representation id="7" width="384" height="216" scanType="progressive" bandwidth="233574" codecs="hev1.2.4.L63.B0">
        <BaseURL>videos/115045-000-A_x265_CRF20_246_10bits_v216.mp4</BaseURL>
        <SegmentBase indexRange="3369-4608">
          <Initialization range="0-3368" />
        </SegmentBase>
      </Representation>
</AdaptationSet>