AS sets major_brand of the MP4s as `isom,' this is non-conformant as Annex E of both :2015 and :2020 expressly states that any brands mentioned in the annex should not be used as major brands. These brands are`iso{m,2..9,a,b}, mp71, avc1, relo.'
Moreover, Note 2 to Section 5.5 of ETSI TS 126 244 implies that `isom' and `avc1' are mutually exclusive and may cause issues.
Given that the data comes from DASH, you might as well leave mp42 in major and mp42mp41avc1 as compatible.
Moreover, Note 2 to Section 5.5 of ETSI TS 126 244 implies that `isom' and `avc1' are mutually exclusive and may cause issues.
Given that the data comes from DASH, you might as well leave mp42 in major and mp42mp41avc1 as compatible.
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