A 3GP_128X96 file describes a very early mobile video type created for 2G and 3G phones, where tiny screens, low storage, and slow networks forced extremely compressed videos, so the 128×96 size made clips easier to record and send while using old codecs like H. If you are you looking for more info regarding file extension 3MM review our own site. 263 and AMR-NB that modern players can’t interpret well, often causing black screens or audio-only playback because today’s software expects newer standards and hardware-optimized decoding not found in these legacy files.