Getting metadata when exporting via API
Answered
Hello,
While exporting a video from nx witness via the api (/rest/v3/devices/{id}/media) and storing to file, the created file (mkv) does not contain metadata, for example, the video start_time.
Is it possible to extract this metadata, either via the above api or some other api?
thanks
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anyone? please?
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Unfortunately, this API does not allow metadata insertion. However, if you need to modify or add metadata to achieve your goal, you can use FFmpeg or similar tools to create a new file with overwritten metadata.
For example, since you already know the desired timestamp, you can use a simple script with an FFmpeg command to generate a new file with the desired metadata. Here’s an example:
ffmpeg -i input.mkv -metadata creation_time='{your_timestamp}' -c copy output.mkv0 -
thank you for the reply.
i need the information concerning the video actual start time. although the export request contain a start time parameter, the actual video start time may be different. imagine record starts at time 10. if i export a video from time 0, i will get a video with the actual start time at 10. i am in need for this actual start time.0 -
Thanks for your comments. However, like you said, we will not know which part you may want to export, and it is likely you export a video which may across two different parts, as a result, I don't think there is a way to achieve that via mediaserver at the moment.
Instead, we suggest you can use the tool and insert the desired metadata.
To get the archive section or footage list, you can use the API -
/rest/v3/devices/{id}/footage
While you will have the footage startTime, and you can use this timestamp in FFMPEG if needed, and if you export the footage across two parts, or it is a long video, you can choose which timestamp is the better one for you - It gives you the flexibility to create the content and achieve the goal, thanks.
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