# Gopro Hero 8 Black Video Sampling

**URL:** <https://forum.mapillary.com/t/gopro-hero-8-black-video-sampling/4139>\
**Category:** Action cameras\
**Created:** [June 8, 2020, 12:24pm UTC](https://forum.mapillary.com/t/gopro-hero-8-black-video-sampling/4139 "2020-06-08T12:24:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bigbang001](https://avatars.discourse-cdn.com/v4/letter/b/71c47a/32.png) [@bigbang001](https://forum.mapillary.com/u/bigbang001)\
**Post date:** [June 8, 2020, 12:24pm UTC](https://forum.mapillary.com/t/gopro-hero-8-black-video-sampling/4139/1 "2020-06-08T12:24:15Z")

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Hi,  
According to instruction [here](https://github.com/mapillary/mapillary_tools#video-support) I run this command:

mapillary\_tools video\_process --import\_path “path/to/images” --video\_import\_path “path/to/videos” --user\_name “mapillary\_user” --advanced --geotag\_source “gopro\_videos” --geotag\_source\_path “path/to/videos” --interpolate\_directions --video\_sample\_interval 0.5 --overwrite\_EXIF\_gps\_tag

image frames extracted from video but images does not have geo tags with this error:

Running geotag\_process for 60 images, skipping 0 images.  
It is assumed that the image timestamps are in UTC. If not, try using the option --local\_time.  
Inserting gps data into image EXIF: 0%| | 0/60 [00:00\<?, ?it/s]Warning, time t not in scope of gpx file by 1591617283.33 seconds, interpolation of latitude and longitude failed for image c:\mp\m\2\i\mapillary\_sampled\_video\_frames\GX011994\GX011994\_000001.jpg  
Warning, time t not in scope of gpx file by 1591617282.83 seconds, interpolation of latitude and longitude failed for image c:\mp\m\2\i\mapillary\_sampled\_video\_frames\GX011994\GX011994\_000002.jpg  
for all images I have same error!  
any one can help solve the problem?

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**Author:** ![bob3bob3](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.mapillary.com/bob3bob3/32/68393_2.png) [@bob3bob3](https://forum.mapillary.com/u/bob3bob3)\
**Post date:** [June 8, 2020, 6:12pm UTC](https://forum.mapillary.com/t/gopro-hero-8-black-video-sampling/4139/2 "2020-06-08T18:12:41Z")

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That number of seconds is the time from the Unix epoch. It kind of implies that whatever mechanism you had to determine video creation time is seeing zero. I have seen another post that suggests an error may exist in the tools over this.

As a workaround try adding the switch --video\_start\_time and the epoch time for the start of your video.

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**Author:** ![bigbang001](https://avatars.discourse-cdn.com/v4/letter/b/71c47a/32.png) [@bigbang001](https://forum.mapillary.com/u/bigbang001)\
**Post date:** [June 13, 2020, 8:26pm UTC](https://forum.mapillary.com/t/gopro-hero-8-black-video-sampling/4139/3 "2020-06-13T20:26:35Z")

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Thank you bob3bob3  
How I find exact epoch time?

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**Author:** ![bob3bob3](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.mapillary.com/bob3bob3/32/68393_2.png) [@bob3bob3](https://forum.mapillary.com/u/bob3bob3)\
**Post date:** [June 13, 2020, 11:48pm UTC](https://forum.mapillary.com/t/gopro-hero-8-black-video-sampling/4139/4 "2020-06-13T23:48:24Z")

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Epoch time is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT). Here is a website calculator if you wish to do it one at a time [https://www.epochconverter.com/](https://www.epochconverter.com/)