[Kdenlive-devel] mlt on OS X issues

[Dan Dennedy]

On Sat, Sep 5, 2009 at 9:42 AM, john malkovich<jhnmlkvch9 at gmail.com> wrote:
>
>
> On Wed, Sep 2, 2009 at 12:21 AM, Dan Dennedy <dan at dennedy.org> wrote:
>>
>> On Tue, Sep 1, 2009 at 9:10 PM, john malkovich<jhnmlkvch9 at gmail.com>
>> wrote:
>> >
>> > This was the problem. Once I started kdeinit4.app kdenlive started up.
>> >
>> > Even though open -a xxxx didn't work, Open kdenlive.app did.
>>
>> congratulations!
>>
>> > I'll start playing with the app now! I'm a little disappointed I can't
>> > capture in OS X, but there is plenty to explore for now.
>>
>> Capture, in general, is very platform-specific technology. So, that
>> functionality is a long ways off unfortunately.
>>
>> > Let me know if you want me to test any part of the app. I'll be glad to
>> > do
>> > it.
>>
>> Right now, I know there is some general instability, and I am working
>> on it. However, there is one thing that I can not reproduce that
>> another kdenlive developer reported. Just add a clip to the Project
>> tree,  add it to the timeline, and then see if it plays for you. Also,
>> see if the monitor updates by just scrubbing/seeking. Choose a format
>> that we know works rather well now like DV or something based on
>> MPEG-2 or MPEG-4 (including H.264). It works for me - for Marco, it
>> does not.
>
>
> I experimented with quite a few formats. The good news is that they all
> play. However, I have not been able to get any of them to play smoothly. All
> the videos I've tried, exhibit jerky playback (very low frame rates).
>
> The same video plays smoothly in VLC player.

This is somewhat to be expected and not going to be addressed in the
near term. It might be that something is not optimal with the
OpenGL-based playout on the ATI video chip. Mine uses NVIDIA, and the
smoothness is roughly the same as what I get on Linux, which is not as
smooth as any of the popular media players. Ultrasmooth playback using
SDL has not yet been given a high priority, and the OS X playback is
based in large part on that SDL code.

Can you give a rough estimate of the roughness? For example, does it
look like it plays most frames, but just not timed well. Or, does it
look like it only plays roughly 2/3 or 1/2 or whatever of the full
framerate? Oh, and I hope you know the framerate is determined by the
Project Settings. For example, playing a 29.97 fps video on a 50i or
25p project setting is obviously not going to look smooth.

At least you did not reproduce the problem that Marco Gittler
reported, and that is the feedback I was really interested in getting
at this time. Thanks!

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