Depending on the producer, you might be able to query the image metadata and
determine the native format.
For example, the avformat_producer will often set the pix_fmt. Try to query
"meta.media.0.codec.pix_fmt" on a frame from the avformat producer widget.
Perhaps you could query the pix_fmt on the first frame and falllback to a
default format if it is not set.
~Brian
From: Paweł Goliński <[email protected]>
To: [email protected]
Sent: Wednesday, July 27, 2016 11:24 AM
Subject: [Mlt-devel] Avoiding implicit conversions when fetching image/audio
from frame
Hi,
I want to pass as much of rescaling/resampling/color conversion tasks
to my consumer as I can. So, when calling, e.g. mlt_frame_get_image()
for image, I want to use parameters that guarantee the least number of implicit
conversions will take place, as I can take care of them in my consumer. What’s
the best way to do that? Is there some way to ask a „loader" producer to produce
„the most native” frame possible?
Example - when I pass „mlt_image_rgb24a” to mlt_frame_get_image(), the MLT
loader producer does its best to produce what I want, so on some video sources
there is an implicit y420->rgba conversion. But my consumer could handle y420
as well, so I could avoid this conversion. Question is, how to know which format
to request, to avoid such conversion?
Best,
Paweł
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