I've been struggling to multiplex DJI UAV footage with the FMV 1.4 plugin for ArcMap 10.6. I've tried running the geoprocessing tool many times and it usually successfully completes (thus giving me no errors!) and produces a file that is under 100KB. The original .MP4 is 2.7GB and the tool takes ~10 minutes to complete. I can also load the original .MP4 to the Video Manager and it plays.
The frustrating part is that a colleague of mine was able to multiplex the same .MP4 and.csv successfully and I too have in the past processed Garmin VIRB .MP4 and corresponding .csv. Anyone having this issue, where the tool successfully runs but produces an unusable output?