RUN(video.src = URL.createObjectURL(source))
EVENT(sourceopen)
RUN(sourceBuffer1 = source.addSourceBuffer("audio/mock; codecs=mock"))
RUN(sourceBuffer2 = source.addSourceBuffer("video/mock; codecs=mock"))
RUN(sourceBuffer1.appendBuffer(initSegment))
EVENT(updateend)
RUN(sourceBuffer2.appendBuffer(initSegment))
EVENT(loadedmetadata)
EVENT(updateend)
EXPECTED (source.activeSourceBuffers.length == '2') OK
END OF TEST