Extract GPS epoch timestamps from RMKN maker note in Ricoh Theta videos#814
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Extract GPS epoch timestamps from RMKN maker note in Ricoh Theta videos#814
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Ricoh Theta cameras write CAMM Type 5 GPS data (lat/lon/alt only, no
epoch timestamps). However, the RMKN (Ricoh Maker Note) box in the MP4
udta container includes a GPS IFD with GPSDateStamp and GPSTimeStamp
tags—true GPS-derived UTC timestamps recorded at the start of video
recording.
This change:
- Parses the RMKN TIFF/EXIF structure in camm_parser.py to extract the
GPS datetime from the GPS IFD (tags 0x001D and 0x0007)
- Adds a gps_datetime field to CAMMInfo to carry the extracted timestamp
- Enriches CAMM Type 5 points with computed epoch timestamps in
CAMMVideoExtractor using the formula:
epoch = rmkn_gps_epoch + (point.time - first_point.time)
- Converts enriched points to CAMMGPSPoint (Type 6) so downstream
consumers receive proper GPS epoch times
- Adds unit tests for RMKN parsing (valid, little-endian, missing GPS
IFD, truncated, bad magic) and point enrichment logic
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Ricoh Theta cameras write CAMM Type 5 GPS data (lat/lon/alt only, no epoch timestamps). However, the RMKN (Ricoh Maker Note) box in the MP4 udta container includes a GPS IFD with GPSDateStamp and GPSTimeStamp tags—true GPS-derived UTC timestamps recorded at the start of video recording.
This change: