hambalan

Correct me if I am wrong, but it seems that people are asking about the size of movies and there is no definitive answers - except fibrizo saying several times that if you encode a video according to his guide, the size of the movie will be around 1.2MB/minute.

Well, for what it is worth, the following may help:

The size of a multimedia file (video or audio) is predominately dependent on its bit rate. To calculate the "rough" size of a file (in MB) of a certain length, simply multiply its bit rate by its length and divide by 8200:

e.g. for a one minute mp3 audio track encoded using "standard" 128kbps:

128 * 60 / 8200 = 0.94MB

For video, add the bit rate for audio + video

e.g. using 32kbps for audio and 128kbps for video, the total bit rate for the file is 160kbps. Applying the formula, 160 * 60 / 8200 = 1.17MB/minute

Using 32kbps audio & 256kbps video will give approx. 2.11MB/minute

Doing some reverse engineering, suppose you have 100MB spare space on you storage card and you want to fit a tv episode of 35 minutes onto it,

100 * 8200 / (35*60) = 390kpbs max. (say, 320kpbs for video and 64kpbs for audio, assuming you want to have the best quality under the space constraint). Of course, any combination under 390kpbs will do.

The above is just a way of doing some rough calculations, but at least it should help in determining what bit rate you should (or can) use for video and audio encoding.

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geezer

Handy and a good starting point for file sizing. I apologize for not replying on the first read. (I get so easily distracted these days...)

Now, are you going to put this into a (PPC) spreadsheet for further ease of use, or shall I?

Thanks,
Jeff

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fibrizo

Although speaking from a practical standpoint, There is an upper limit to bitrate because any higher and the axim can't handle it...

The highest I've personally encoded at was 256bit video and 64bit audio...

or 192kbit video and 128 kbit audio.

both at a total of 320kbit/sec. They play with minimal frame dropping (like maybe 1-5 frames out of a 45 min clip)

These settings both work, granted that you are using the 0.80 version of the PDD file, and not the standard file comes with pocketmvp..

Anyone else try higher settings? What were your results? How many frames dropped.

ceej13

I have a Wedding video at a bit rate of 229KBps, size: 320X240, plays at 218KBps at 20fps and it is approximately 36.1MB. Handles nicely on the Axim Advance with the PXA255 and tweeking the GlyphCache from default 8192 to 32768. If I left it at default, then I would see frame drops. I have audio files that are at 64KBps,96Kbps, 128Kbps, and 192Kbps. I have a few that are 5MB And those are 196 or 128 kbps and ther rest average 2MB. All play nicely.

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