Pass video rotation info to LPMS transcoder

[AlexKordic]

Abstract

.MOV input files in VOD pipeline contain metadata describing video rotation/orientation that gets lost if MPEG-TS container is used. We want to include this info as part of transcode request.

Motivation

iPhone recorded VOD assets gets wrong orientation after transcode. Portrait videos are produced as landscape.

Proposed Solution

Before segmenting VOD rotation info is extracted by MistServer then passed to Broadcaster, then to Transcoder and into LPMS transcode3() where we rotate decoded image before passing to outputs.

Implementation Tasks and Considerations

MistServer task livepeer/catalyst-api#251
Catalyst-API task livepeer/catalyst-api#251
LPMS task livepeer/lpms#364

Testing Tasks and Considerations

Known Unknowns

Alternatives

If we used MOV container in entire pipeline this wouldn't be necessary.

Additional Context