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MediaInfoLib
Convenient unified display of the most relevant technical and tag data for video and audio files.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
can you use https://mediaarea.net/MediaInfo and post the text output. maybe there is something malformed in the source that the render engine is unhappy with. as soon as i see sync issues that dont make any sense, i always blame the source media and look to reencode it or somehow repackage it (like with handbrake) into a known and not wierdo format. remember mp4 is just a box. there might be a cat in that box, there might not be a cat at all.
https://handbrake.fr/ its very easy to use.