I also noticed that vf_scale.c has an option to use multiple slices, but
I don't have code yet to exercise ffmpeg video filters, and I don't know
how to configure it to use slices using ffmpeg.exe command line.
On 9/19/2017 3:30 PM, Martin Belleau wrote:
I was able to get sliced scaling to work, using a different SwsContext
for each slice.
The problem is I can only use two slices, otherwise I run into the
'Slices start in the middle!' error. The line of code that detects
that error is:
if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH !=
c->srcH)
I'm not sure about sliceDir (I think it's about handling of
upside-down slices?) but basically either srcSliceY has to be 0
(meaning your slice starts from the very top of the source), or
srcSliceY plus srcSliceH has to be c->srcH (meaning your slice ends at
the very top of the source).
Is that 2 slice limit a known and expected limitation?
On 9/18/2017 8:09 PM, J Decker wrote:
I would think you would want different SwsContexts for each thread.
Otherwise you'd set the parameters for the first thread, and then the
second thread would override those parameters used in the structure.
On Mon, Sep 18, 2017 at 10:19 AM, Martin Belleau
<[email protected] <mailto:[email protected]>> wrote:
I see that sws_scale has srcSliceY and srcSliceH, which should
allow to perform scaling of different slices in parallel.
Is there any sample code which demonstrates how to use it?
Should the same SwsContext be used to scale all the slices?
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