Hi, I don’t if no one had this problem or I can’t use a search function…
I have recordings from some navitel dashcam I video from rear camera is flipped/mirrored left-right. I think someone mounted rear camera wrong side 
How to fix it not doing it file by file? One I fixed with clipchamp, but it’s not the way I would appreciate. GPS coordinates are in separate file, so this is not an issue.
Yes, unfortunately you will need to do this for each incorrect video file in a video editor (you can probably do a batch operation with something like ffmpeg, for example Flip Videos in Batch with These 3 Free Software)
Seems like Mediacoder is doing good job.
Thanks 
I’d be wary of image quality loss of a video conversion process, so this is what I would do.
- Run video_process from mapillary_tools. This creates all the individual geotagged images.
- mogrify -flop (mogrify is part of ImageMagick)
- Run upload from mapillary_tools
AFAIK mogrify wont adversely affect the EXIF tags nor touch the Mapillary specific json file. If filesize etc cross-checking is done in upload though one can mapillary_tools sample_video only, which creates the images with a creation date/time stamp only. Then run process_and_upload after the mogrify step.
Only real downside is that if you currently upload videos only, then the total upload size will approx double.