- published: 23 Jul 2007
- views: 39704
AMV is a proprietary video file format, produced for MP4 players, as well as S1 MP3 players with video playback. There are now two different MTV formats: the older one for the Actions chip, and a newer one for ALi’s M5661 chip. This format for ALi one was ALIAVI.
The container is a modified version of AVI. The video format is a variant of Motion JPEG, with fixed rather than variable quantisation tables. The audio format is a variant of IMA ADPCM, where the first 8 bytes of each frame are origin (16 bits), index (16 bits) and number of encoded 16-bit samples (32 bits); all known AMV files run sound at 22050 samples/second.
Low decoder overhead is paramount as the S1 MP3 players have very low-end processors (a Z80 variant). Video compression ratio is low – around 4 pixels/byte, compared with over 10 pixels/byte for MPEG-2 – though as the files are of low resolution (96×96 up to 208×176) and frame rate (10, 12, or 16 frame/s), file sizes are small in bytes per second. With a resolution of 128×96 pixels and a framerate of 12 frame/s, a 30-minute video will be compressed into 80 MB.
I was driving through the night
Into an endless tunnel of fog
When it dawned on me something was wrong
I was in a trance, hypnotized
Bored beyond belief, I was listening to the same old song
I know every lick, every word every nuance
I'm on first name terms with the crew
But I'd better get used to this poop du jour
Sure as hell they won't play anything new
Oh yes, I love you really
Classic Rock Radio
Oh, my dear it's time for bed
Time for you to go
Everyone is asleep
The pirates took to the water stole the charts
But sadly that didn't go down well with those upstairs
Who require loyalty, the establishment considered
That the uncontrolled appreciation of music
Was a danger to royalty, the mighty empire roared
As Cash 'n' Everitt on the high seas
Looked like they'd get blown out of the water
They did of course eventually come ashore
As meek as mice or to be more accurate as lambs to the slaughter
Oh yes, I love you really
I stand to attention
Oh, Fanny, I love you dearly
Something else I should mention?
You sweet thing
Let's not talk about MTV
I don't even want to start
I want to take a look at Classic Rock Radio
We're talking about the state of the art
Mr Grover 'n' Mr Gillian
You musta made a million
The night that Frank Zappa caught on fire
Could you tell us all about it
Keep it short and use my version
Or everyone out there'll think I'm a liar
We can speak about bananas for one second
Just because I understand
You have to get them off your chest
But in the meantime while you're talking
Could you do some more of these here ID's
And then this station might maintain some interest
Oh yes, I love you dearly
But why do you exist?
Oh yes, I love you really