[FFmpeg-user] Can't concat Garmin DashCam videos with telemetry (GPS data)

[Suporte JM]

Hi,

I have a Garmin 66W dashcam for my work (street mapping surveyor) which
produces several 1min. MP4 videos of my journey (60 min. = 60 videos). All
these videos have telemetry data on it as metadata (GPS location, speed,
etc...).

I want to concatenate every 5 files excluding the audio but preserving the
video and the telemetry in the metadata.

What I have tried so far:


   - Export GPS information as GPX file (result: successful)

*exiftool -p gpx.fmt -ee X:\video_place\videos_1m\GRMN0005.mp4 >
GRMN0005.gpx*


   - Merge MP4 videos as a single MP4 video (result: partially successful)

*ffmpeg -f concat -safe 0 -i X:\video_place\videos_1m\mylist.txt -c copy
X:\video_place\videos_1m\GRMN0005to0011.mp4*

When I use the above command on ffmpeg *I lose all my telemetry data*.

I tried in several different ways for days, searching on several forums, I
even tried to export all GPS data from each single 1min. file merge them,
and then merge the videos and put the telemetry back.

The ffprobe output of my 1min. video is as following:





















*Metadata:major_brand : avc1minor_version : 0compatible_brands:
avc1isomcreation_time : 2021-07-26T17:08:23.000000ZDuration: 00:01:00.06,
start: 0.000000, bitrate: 19553 kb/sStream #0:0(eng): Video: h264 (Main)
(avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 19182 kb/s, 29.97 fps,
29.97 tbr, 30k tbn (default)Metadata:creation_time :
2021-07-26T17:08:23.000000Zhandler_name : Ambarella AVCvendor_id :
[0][0][0][0]encoder : Ambarella AVC encoderStream #0:1(eng): Audio: aac
(LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 128 kb/s
(default)Metadata:creation_time : 2021-07-26T17:08:23.000000Zhandler_name :
Ambarella AACvendor_id : [0][0][0][0]Stream #0:2(eng): Subtitle: mov_text
(text / 0x74786574), 0 kb/s (default)Metadata:creation_time :
2021-07-26T17:08:23.000000Zhandler_name : Ambarella EXT*

I have tried as well with following code, but none of them seems to work:


*ffmpeg -f concat -safe 0 -i X:\video_place\videos_1m\mylist.txt -c copy
-scodec copy X:\video_place\videos_1m\GRMN0005to0011_scodec.mp4*


*ffmpeg -f concat -safe 0 -i X:\video_place\videos_1m\mylist.txt -c:s copy
-c:v copy X:\video_place\videos_1m\GRMN0005to0011.mp4*

*ffmpeg -f concat -safe 0 -i X:\video_place\videos_1m\mylist.txt -c copy
-c:s mov_text X:\video_place\videos_1m\GRMN0005to0011.mp4*

What am I missing?

Thanks.
Rodrigo