On 09/18/2020 03:01 PM, Carl Eugen Hoyos wrote:
Am 16.09.2020 um 15:58 schrieb Mark Himsley <mark.hims...@gmail.com>:
On Mon, 14 Sep 2020 at 15:42, Mark Filipak (ffmpeg) <markfili...@bog.us> wrote:
Is the input to the bwdif filter fields or frames?
The input to every filter in a filter chain is a raster of pixels.
That raster may contain one frame or two fields.
That may not be wrong (apart from Paul’s comment) but I wonder how useful it is:
No matter if the raster contains one field, two interlaced fields or a
progressive frame, the filter will always see an input frame.
"...if the raster contains *one field*...the filter will always see an input
*frame*."
How is that possible? How can a frame contain just one field?
The fact that there is metadata that may signal the content is also not
necessarily helpful as this metadata is typically wrong (often signalling
fields when a frame is provided).
Can you provide an example (or a link to an example)? I've examined a great number of DSM mpeg
presentation streams ('VOB's & 'm2ts's) and I've not seen a single case. What metadata are you
looking at?
sequence_extension: 'progressive_sequence'?
picture_coding_extension: 'picture_structure'?
picture_coding_extension: 'top_field_first'?
picture_coding_extension: 'repeat_first_field'?
picture_coding_extension: 'progressive_frame'?
That’s why the filter ignores the information by default.
(If you provide only one field, no FFmpeg deinterlacer will produce useful
output.)
The bwdif filter will interpret a single raster and is designed to
output two rasters, each containing one or the other of the fields
that were contained in the input raster.
"...interpret a *single raster*...one or the other of the fields...in the *input
raster*."
Mark Himsley, how are you defining "raster"? I thought you were equating a "single raster" with a
frame and "two rasters" with fields, but now I'm unsure what you mean.
You can request that the filter outputs one instead of two rasters for one
input raster.
--
COVID-19 perspective, 0 AM UTC, 20 September 2020.
Yesterday, China: 14 new cases, S.Korea: 110, U.S.: 42,533.
Today, U.S.: 4% of world population, 22% of cases, 21% of deaths.
Today, U.S.: Of 4,427,517 resolved cases, 95% lived, 5% died.
22 Jan: U.S. & S.Korea reported 1st cases on the same day.
6 Mar, S.Korea: 140,000 total tests; results in 4 hours.
6 Mar, U.S.: 2000 total tests; results in 1 to 2 weeks.
May, for the first time, U.S. care-homes are required to report.
1 Jun, total care-home deaths, S.Korea: 0, U.S.: 26,000 to 40,000.
5 Aug, U.S. tests still only 1/4 of number needed; 4 day results.
1 Sep, over 60% of U.S. nurses still lack protective equipment.
18 Sep, U.S. doctors & nurses still acutely lack PPE; 1200 dead.
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