Netflix created a spec to encapsulate VPx codecs in ISO-BMFF (MP4) Container [1]. This CL adds support for VP8 and VP9 video codecs in the MP4 container. [1] https://github.com/Netflix/vp9-dash/blob/master/Downloads/VPCodecISOMediaFileFormatBinding.pdf ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=123160650
