On Thu, 05 Oct 2006 11:28:28 +0200, Marcin Kostur
<[EMAIL PROTECTED]> wrote:
Hi Cinelerra HDVers,
I see that some of you work with HDV, what is you workflow scheme?
I can imagine that working with ~1fps playback is away from perfection.
Did anybody used a trick: scale all material, edit and change path in
*xml?
I am about to buy HV10 which produces 1080i. Probably I would like to
work with 720p as - 1080i can be converted with small loss to
[EMAIL PROTECTED]
My system is dual core intel [EMAIL PROTECTED]
Dual core is good for HDV!
Since then Marcin has told us that he uses proxies (MJPEG-encoded copies)
to get more responsive full-speed playback. I had also been annoyed by
Cinelerra's brief pausing at every edit in HDV projects. Hardly usable.
So I took a look in the Playback tab of the Preferences, and saw a couple
of items that looked promising:
* Decode frames asynchronously
* Preload buffer for Quicktime
I read Heroine's documentation of the two here...
http://www.heroinewarrior.com/cinelerra/cinelerra.html#VIDEO-OUT
...and found that the Preload buffer hardly was relevant, but that
"Decode frames asynchronously" certainly was.
"If you have lots of memory and more than one CPU, this option can improve
playback performance by decoding video on one CPU as fast as possible
while dedicating other CPU to displaying video only. It assumes all
playback operations are forward and no frames are dropped. Operations
involving reverse playback or frame dropping are negatively impacted."
I was dismayed that I could only enable it if "play every frame"
was toggled, but it _certainly_ helped forward playback! Now there
were no pauses around edits anymore. (my laptop is a Core Duo)
Backward playback, however, was slooow. I would love to have
some combination of frame-dropping and asynchronous playback,
as this would make HDV editing in Cinelerra truly usable on a
Core Duo. For single-track projects, I could do fine without
proxies, even on a laptop.
--
Herman Robak
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