[Ffmpeg-devel] [PATCH] Add support for the NXV container

Eric Werness lists
Fri Feb 23 08:47:19 CET 2007

The NXV file format is used by the Brando MP4 watch and a few other 
small gadgets that seem to be based on the same core.

The format is documented here: 
http://wiki.multimedia.cx/index.php?title=NXV All of that is reverse 
engineered, so it's likely that some parts have errors or are incomplete.

The decoder portion of this code has been tested against a dozen or so 
NXV files encoded with the official Windows software at different 
resolutions and quality levels.

The encoder currently only support one quality level, but with different 
resolutions and framerates. The different quality levels, from a quick 
look, appear to just be telling the watch to scale by 2x2 or 4x4 instead 
of making the video a little window on the watch.

The A/V sync is a bit problematic, some of which is probably due to the 
format relying on the MP3 bitrate staying stable and precise.

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