Does not read well altitude in GoPro Hero 6

Does not read well altitude in GoPro Hero 6
With other programs, the altitude is correct, with this, the altitude is poorly indicated, near 180ft would be interesting to review these data, as I tested with other programs and exits the right altitude, or leave in the Altimeter section, be able to adjust to an altitude Known and so the measure will be correct.
Tests made with same file, at altitude known to me and different programs.
Gopor Hero 6 Black

A number of members are having problems reading data from their Gopro's 5 and 6. You may want to export the data into a csv and see if there is no data corruption. Here is one workaround that was suggested:

QUOTE=ArnoldStorm;533199]I have found a workaround for this. Its a bit laborious, but in my circumstances seems to work. I also think I know what causes it. In my situation I am actually filming railway track inspection data, and my track inspector seems to have turned on the camera, (GoPro Hero 5) and started recording immediately. This seems to have started the recording before the GPS has locked on, so the first bunch of records have corrupted GPS and time stamps. This seems to upset Racerender (but not Dashware). Note that I am using the GoPro with its internal battery removed, and powered from a larger batterypack, to give me 6+ hours of recording. This may be compounding the issues as the Cameras internal clock is probably not set.

My fix for this is as follows. (Note, this is all assuming you have a long video the the GopRo has broken into multiple files)
Open Racerender and load ONLY the first Mp4 in the video set. Say YES to extereact GPS data. Export the GPS data to CSV
Repeat this for each subsequent video in the data set, so that you have a CSV file for each video.
Edit the first CSV in Excel. Check how many records at the top of the file are corrupted. Mine initially had zero for the Time and GPS, then a bunch with random time and GPS before the records appeared to come correct.
Replace the GPS coordinates that are wrong with a copy of the first GPS that is correct.
Select about 10 of the correct time fields, and drag up to overwrite the incorrect fields. Excel will decrement the time value by the same spacing as the 10 you had selected.
Then append the data from each subsequent CSV file to the bottom of the first file.
Save your modified file with "Merged" appended to the end of the file name.
Open Racerender and import the first MP4 in your dataset. Say YES to open linked videos. Say NO to extracting GPS data.
Import your modified MERGED data file.
Trim the first minute (or whatever is required) from both your video and merged data file so your video starts after the corrupted records.


Hope this helps anyone else in the same situation.[/QUOTE]