Regression from what version or time frame? Is it really a regression or a
long-standing problem?
>From the sound of it, the automatic increment of avformat producer cache
size might not be working as expected. The automatic part of this is in
mlt_multitrack.c: when tracks are added the size is increased too track
count plus one. That will cause for each frame at least one producer to
release its avformat and avcodec contexts and file handle and re-open this
within another producer.
Try running it with melt command line with env var MLT_AVFORMAT_CACHE=20 to
see if it makes a difference. That will set a minimum cache size whereas
the default is 4. Obviously, I have been talking about avformat producer
primarily. If you are using images that might be another matter.
On Sat, Jan 21, 2017 at 11:15 AM Harald Albrecht <[email protected]>
wrote:
> Hi,
>
> over time I've seen strange performance breakdowns in my Kdenlive/MLT
> projects, where sometimes playback and rendering of a multi-track
> timeline breaks down to a crawl without a compelling reason (to me, that
> is). When six clips are composed of each other (using the Qt composite &
> transform transition), then rendering breaks down from around 15fps to a
> single frame every three seconds or so. CPU load is negligible, around
> 16% on a Core i7, so most cores are idle.
>
> I've finally isolated a minimal regression project, both as .mlt and
> .kdenlive files with a few associated image files, ~400kb in total.
>
> melt --version gives "6.5.0", it's from the Kdenlive git master ppa
> which also has the recent git master MLT to offer.
>
> If someone is willing to look into this issue then I'm happy to send my
> regression project. There is no private data included.
>
> With best regards,
> Harald
>
>
>
>
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