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Ideally, videos share the same format, resolution and framerate for a homogeneous result. Merging automatically realigns streams, but overly different formats (720p + 4K) yield an unbalanced result.
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Ideally, videos share the same format, resolution and framerate for a homogeneous result. Merging automatically realigns streams, but overly different formats (720p + 4K) yield an unbalanced result.
Risks by difference
Different resolutions
The smaller video is stretched or has black bars
Different framerates
Stuttering or audio desync
Different codecs
Transcoding needed, degraded quality
Practical advice: first convert all videos to the same format with "Convert video", then merge.