#V-lab motion
09-Jan-95 21:26:20
Sb: #181020-#V-lab motion
Fm: Ed Vishoot 71271,2165
To: Thomas H. Giebink 75573,3541
Tom… drive friendly in texas,
Sorry about the response time but I've been playing really hard lately <grin>!
Let's see, question about the VLAB-M — I hope you have seen some of my
previous postings on the VLAB because they addressed some of the things you are
asking about in more detail from my perspective.
The weak-link with the VLAB-M software (MovieShop version 1.2) is audio
editing! It's about as simiplistic as you can get — specify an audio file to
play while the video stream is playing. Any audio editing out side of simply
playing has to currently be done with another program called Samplitude (which
is provided). This is a pain if all you want to do is shorten an audio segment,
but sufficient if you want to do fun things like add echo, cut & paste, invert,
reverse, etc. I am also experiencing a slight delay of the audio playback that
is noticeable if you are doing head shots (lip-sync problem). I've heard
rumors that the upcoming MovieShop Version 2.0 software will fix the slight
audio delay problem, but don't know if any audio editing facilities have been
added. If you want to lock audio to video for insertion, I suspect you would
need to use SMPTE "optional module" for the Toccata audio board.
When it comes to capturing decent video, there is NO such thing as a big hard
drive <grin>. The first drive I abused with my VLAB-M was a Syquest 270
removeable — I was able to capture about 5 minutes of video at a 50% JPEG
factor setting (looked like VHS tape playback to me with some visible JPEG
artifacts). I soon went out and purchased a Micropolis 1Gb drive so I don't
really know how well suited the Syquest is for heavy duty editing. I'm now
running the Micropolis with a 80% JPEG factor and getting what I consider very
impress output. I don't know how long of a video clip a can get on the
Micropolis. I was messing around one day and don't remeber what JPEG factor I
had set (probably 50%) but I recorded over 12 minutes of straight video before
I got bored and stopped it. To me, this was incredible especially when I look
back at my little adventure with the Broadcaster 32 board.
I have dedicated 6Mb RAM for MovieShop buffering, but I have 18Mb in my
system. How much RAM to use depends if your drives are up to the task of high
sustained data rates. I noticed little difference if I went above 6MB, in fact,
the 6Mb buffer offered just a little improvement over the MovieShop default of
4Mb but I have the memory so I said why not <grin>! If I didn't like
multitasking so much, I'd probably give some more.
I have experienced crashes <surprise, surprise>! Through experimentation, I
have learned there are things you can do to cause a crash. Most of these are
associated with setting MovieShop parameters, so once you've found the magical
settings, it becomes pretty stable. As an example, if you monkey with the
transfer buffers after using the system at least once, then I highly recommend
you save your changes as defaults, quit MovieShop, and then restart it! If you
don't follow this procedure, I will bet that your system will crash as soon as
you attempt to record/playback after the change. Makes it a pain to setup, but
this might prevent you inventing the same new curse words I spouted while
setting mine up <grin>!
I use the IV24 24 bit RGB/video board. You do not need a 24 bit board to use
MovieShop! I use a good old flicker-free Amiga screen for all the MovieShop
windows, but I only have certain ones open — the ones I use most <wink>. It is
my understanding that with the Retina board will give you two things I don't
have: A huge visible screen to open ALL the MovieShop windows on (if your
monitor can support it), and the ability to view the MovieShop reference
images/icons in full color vice my 16 color greyscale images (more like
greyscale blobs!). I personally don't miss either but wouldn't turn it down if
someone wanted to give it to me <grin>.
You can export images out of any captured video scene which can then be
processed by any Amiga image processing software! The exported images will
reveal the JPEG artifacting much more readily than the video stream does and so
if you are looking for good images, you need to bump up the JPEG factor to
around 80% or higher. I use the IV24 for framegrabbing becuase it's obviously
much faster. The VLAB-M does 60 fields/second. When exporting (or even
importing) images, you can select field or frame mode.
I have the VLAB-M and Toccata boards installed in my A3000 that has a 25MHz
'040 squeezed into it. For all the effects you may want to do (they are all
rendered), the '040 definately helps (I'm going to get an '060 for sure now)
but I don't think it has much influence on the capturing/playback of the video.
I believe the biggest bottle neck in any machine to achieving the 100% JPEG
factor setting (the highest quality) is it's ability to transfer sustained data
rates across the zorro bus through your SCSI controller and finally to your
hard drive. I have used a maximum 80% JPEG factor with no problem but don't
know what my upper limit is.
I'm in the process of converting some captured video into Amiga anim files. I
have no doubt that I could export these same individual images to a MAC or
CLONE to create quicktime or AVI files (no software on the Amiga creates these
file formats as far as I know).
Technology makes sinking any money into anything a risky adventure! Aren't
you pleased as punch you bought that 386 doorstop <wicked grin>? I believe the
VLAB-M and Toccata hardware are great (or I wouldn't be getting the results I'm
so impressed with) but the software does need some work. Fortunately,
MacroSystem is based in Germany where the Amiga is still a viable product, so I
expect future software releases for sometime. Whether VLAB-M mets your editing
needs, I really can't say. If you're one of the fanatical and expect that
elusive "broadcast quality" then you better wait for the next generation board
which is supposed to support even higher sustained data rates through the Amiga
zorro (3) bus. As a potential reference, if you have seen the PAR, I suspect
the current VLAB-M quality is very comparable considering they use the same
type of technology.
It definitely has some warts (doesn't everything – they just don't tell you),
but I still find it impressive and useable! Your best bet is to check it out at
a knowledgeable dealer, then you could make a better determination. If you
can't find a knowledgeable dealer (highly likely these dark days in the Amiga
kingdom) you're welcome to come see mine even if it is one heck of a long drive
<grin>.
EdV