The best MPEG4/MP4 file joiner depends entirely on whether your videos share the exact same resolution and frame rate, or if they are completely different.
When combining video files, you have two routing paths: Lossless Joining (instant merging without re-encoding) or Re-encoding/Encoding Mode (necessary if the videos have different aspect ratios, codecs, or frame rates). Super Easy & Free Way to Combine Multiple Video Files
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