MPEG4Extractor: ensure kKeyTrackID exists before creating an MPEG4Source as track.
GenericSource: return error when no track exists. SampleIterator: make sure mSamplesPerChunk is not zero before using it as divisor. Bug: 21657957 Bug: 23705695 Bug: 22802344 Change-Id: I7664992ade90b935d3f255dcd43ecc2898f30b04
Loading