QuickTime frame edits

[Mikey]

I have to assume I'm out-of-date with respect to QT; I haven't touched
it in years, except for still images importers & exporters.

I need to take an existing movie, draw or perform simple fx on each
frame, and then recompress the movie, maintaining the existing
settings and key frames, et al (it won't be complex editing, really).

The way I would have done this in the past is to do make a GWorld
(duh), get the first track in the movie, make a second movie, and then
copy the settings of the first into the second (IIRC). Then I do the
BeginMediaEdits / AddMediaSample / EndmediaEdits.

Is there an easier, more straightforward way now (contemporary with
Jaguar), or is there a recent sample? I'm Carbon / PP, but I'd like to
take advantage of any improvements (without, hopefully, reading all
12,000 pages of the dox!) available in newer QT APIs, or in Quartz.

[Yeah, I looked, but I seem to be having diffficulty looking for APIs
with the search on the developer site. And I can't download all the
samples - I'm on the dialup these days!]

thx to all!

[Tom Dowdy]

In article <111020031423474795%For...@forget.com>,

Mikey <For...@forget.com> wrote:
> I need to take an existing movie, draw or perform simple fx on each
> frame, and then recompress the movie, maintaining the existing
> settings and key frames, et al (it won't be complex editing, really).

Note that you probably are NOT going to get the same keyframes. Once
you have made changes to a video stream, the compressor may very well
select other frames to be the keyframes.

> Is there an easier, more straightforward way now (contemporary with
> Jaguar), or is there a recent sample? I'm Carbon / PP, but I'd like to
> take advantage of any improvements (without, hopefully, reading all
> 12,000 pages of the dox!) available in newer QT APIs, or in Quartz.

Your basic approach is correct, but you probably want to look at newly
posted sample code that demonstrates this sort of thing:

<http://developer.apple.com/samplecode/Sample_Code/QuickTime/Goodies/Vide
oProcessing.htm>

"This is a demonstration program for processing video (both live and
stored) using various
methods within QuickTime. More specifically, this sample demonstrates
the following techniques:

- color clamped movie playback
- alpha overlay movie playback
- alpha overlay movie conversion
- motion detect sequence grab
- alpha overlay sequence grab
- color clamped sequence grab
- film-noise effect sequence grab
- blended sequence grab

Requirements: Mac OS 10.2, Project Builder version 2.0.1, or MetroWerks
CodeWarrior 8.0"

[Mikey]

In article <dowdy-C4E64A....@news.apple.com>, Tom Dowdy
<do...@apple.com> wrote:

> In article <111020031423474795%For...@forget.com>,
> Mikey <For...@forget.com> wrote:
> > I need to take an existing movie, draw or perform simple fx on each
> > frame, and then recompress the movie, maintaining the existing
> > settings and key frames, et al (it won't be complex editing, really).
>
> Note that you probably are NOT going to get the same keyframes. Once
> you have made changes to a video stream, the compressor may very well
> select other frames to be the keyframes.
>

Hmm.. This is an issue I'm concerned with. Maybe the key frame
selection should be better left to the compressor, or perhaps if
there's a periodic key frame selection, the rate should be retained.
Not knowing much about authoring (no experience on that end, really),
this is a sticky area.

> > Is there an easier, more straightforward way now (contemporary with
> > Jaguar), or is there a recent sample? I'm Carbon / PP, but I'd like to
> > take advantage of any improvements (without, hopefully, reading all
> > 12,000 pages of the dox!) available in newer QT APIs, or in Quartz.
>
> Your basic approach is correct, but you probably want to look at newly
> posted sample code that demonstrates this sort of thing:
>
> <http://developer.apple.com/samplecode/Sample_Code/QuickTime/Goodies/Vide
> oProcessing.htm>
>
> "This is a demonstration program for processing video (both live and
> stored) using various
> methods within QuickTime. More specifically, this sample demonstrates
> the following techniques:
>
> - color clamped movie playback
> - alpha overlay movie playback
> - alpha overlay movie conversion
> - motion detect sequence grab
> - alpha overlay sequence grab
> - color clamped sequence grab
> - film-noise effect sequence grab
> - blended sequence grab
>
> Requirements: Mac OS 10.2, Project Builder version 2.0.1, or MetroWerks
> CodeWarrior 8.0"

Super. Thx tom.

[Mikey]

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In article <dowdy-C4E64A....@news.apple.com>, Tom Dowdy
<do...@apple.com> wrote:

> In article <111020031423474795%For...@forget.com>,
> Mikey <For...@forget.com> wrote:
> > I need to take an existing movie, draw or perform simple fx on each
> > frame, and then recompress the movie, maintaining the existing
> > settings and key frames, et al (it won't be complex editing, really).
>
> Note that you probably are NOT going to get the same keyframes. Once
> you have made changes to a video stream, the compressor may very well
> select other frames to be the keyframes.
>
> > Is there an easier, more straightforward way now (contemporary with
> > Jaguar), or is there a recent sample? I'm Carbon / PP, but I'd like to
> > take advantage of any improvements (without, hopefully, reading all
> > 12,000 pages of the dox!) available in newer QT APIs, or in Quartz.
>

Thanks Tom I took a good look at the example. This is exactly the kind
of thing I suspected - that there's a nice organic way of solving the
problem. Thank you very much.

[Btw - i was just reviewing my QT SDKs, and saw you in some "welcome to
the SDK" movies]

However, by not coming to the "how" myself I invariably have to ask
"why?" That is, why is the custom component approach superior to any
others? It certainly makes sense, but I'm curious as to how a way-more
experienced person sees it.