You completely ignored the fact that some filters are called useless.
But just keep living in your bubble of ignorance.
Does it explain why they consider them useless? Or is it just
defamatory without further elaboration?
I'm the author of the book. You can download the PDF here:
+ * The steps are:
+ *
+ * 1. query_formats(): call the callbacks on all filter to set lists of
+ * supported formats.
+ * When links on a filter must eventually have the same
+ * format, the lists of supported formats are the same
+ *
Are those keys listed somewhere in the documentation?
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I'd like to suggest to revert this patch for the v360 filter:
http://ffmpeg.org/pipermail/ffmpeg-cvslog/2020-October/124887.html
Why should it be reverted?
-- Because after this patch, the yaw, pitch and roll angles have a
different meaning. If they are set in the command line, they are
Invalid reasoning. Absolute rotations give those issues.
These issues can easily be avoided by keeping the pitch angle in the -89
to +89 range, for example.
Please don't misunderstand me, I'm not against relative rotations. If
you need relative rotations for your application, feel free to
We have 0 project ideas on our gsoc 2022 page
well we have 2 now as i copied my two from last year
If you have an idea, please add it!
Might it be possible to integrate LibRaw into FFmpeg?
https://www.libraw.org/
This could also solve the problem that import of DNG images doesn't work in
please remove the spammers from tickets 1920, 2104, 2776, 3720, 4748 and
5154.
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new spammer in ticket 2776
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new spammer in ticket 2104
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I see the "Delete selected as Spam" button, but no "Remove registered
user" button.
Michael
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I guess deleting users requires full admin rights, so i guess, just make a list
of users which are in need of a deletion and post that and i or less likely
some other admin will disable/delete them.
Please delete user "selune" in ticket 2104
You and everyone else in the spam fighter group
IIRC each regex give -10 so multiple matches give more.
So far, the search strings contain only combinations of keywords, for example
"concretevictoria".
False positives are almost impossible.
I could add shorter keywords, for example "concrete" and "victoria".
Then we would get multiple
IIRC each regex give -10 so multiple matches give more.
Let's assume we have a long keyword like "concretevictoria". Nobody uses
this keyword in a normal text. A false positive is almost impossible.
I could search for "concretevictoria", "concretevictori." and
"concretevictor.." and get
You would have to read the trac source probably and maybe do local tests
tracing through the code what happens
but a non spammer posting spam
setting up trac locally is easy, it comes with its own deamon you dont
even need a webserver
That sounds too complicated for me.
What about my other
Is it possible to make the "Bad Content" page invisible? It would be
better if the spammer can't see the filtering rules.
Michael
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please delete:
comment 12 in ticket 1920
user ""willow"
I have updated the regex filter so that it should match all combinations
of two keywords, in both orders.
Michael
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Please delete:
Comment 14 in ticket 2104
Comment 2 in ticket 5154
User "ballid"
The duplicated search patterns in regex filter did work as expected (-20
points), but the spammer got +20 points from captcha.
I've updated the search patterns.
Michael
Please delete also user "bunnylid". He did not yet write anything, but
he did register with the same IP adress as the other spammer, only a few
minutes earlier.
Michael
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I just updated the dead link, also added the link to Wikipedia, added
some keywords for our favourite spammer, and added short descriptions
what (?i) and .? means.
Michael
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Ticket / Comment
1920 / 12
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(?i)customer.?support
(?i)customer.?care
(?i)customer.?service
What's the meaning of (?i) and .?
I can't find that in Python syntax description.
Michael
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I'm not sure if I understood that right. If I add a keyword to the list
on this page
https://trac.ffmpeg.org/wiki/BadContent
then any posting which contains this keyword will get a negative score?
And if the score exceeds a threshold, then the posting will be rejected?
Is this only for changes
Is it ok if I remove the dead link to Python syntax, and replace it by
this link to Wikipedia?
https://en.wikipedia.org/wiki/Regular_expression
Michael
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Ticket / Comment
2104 / 14
2776 / 6
3720 / 9
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The last username was "sharselune".
Can't we also delete the spam from the archive?
http://ffmpeg.org/pipermail/ffmpeg-trac/2023-September/067004.html
http://ffmpeg.org/pipermail/ffmpeg-trac/2023-September/067006.html
http://ffmpeg.org/pipermail/ffmpeg-trac/2023-September/067058.html
Please have a look at the Spam Filtering / Monitoring page.
One of the spammer's postings was rejected, because it contained a
blacklisted pattern in Regex filter and got -10 points.
But 20 seconds later the same posting was accepted, because the spammer
was successfully verified by Captcha and
please delete:
comment 14 in ticket 2104
comment 6 in ticket 2776
user "bristleback"
Thanks,
Michael
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When I edit the BadContent list, do the new search strings immediately
become effective, or must I wait some time?
Michael
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I've just tested the regex filter with a posting in ticket 2776. This
test was not successful.
I thought that the second entry from the end of the list should have
matched:
(?i)regards.{0,5}http
In words: Switch to case insensitive, search for "regards" followed by 0
to 5 of any characters,
strings that are certain spam, you can just add that twice for double the
points lost
done.
should i add /pipermail/ffmpeg-trac to robots.txt ?
is there anyone who googles in these ffmpeg trac archives ?
I don't.
Michael
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Iam not aware of any delay, did you see a delay ?
I did change the search string (2nd from end of list) and 19 minutes later I
made a test posting in ticket 2776.
I have no idea why the pattern wasn't found.
Michael
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Hi Francesco,
in my opinion the line spacing looks good. But there is still the
problem that the y position of the baseline depends on the height of the
characters in the first line. You see that when you switch between your
pictures line_height_net_arial.png and line_height_new_arial2.png.
Hi Francesco,
I think the y position of the baseline should be independent of the
content of the textfile.
For example, you might want to change the color in the middle of a text.
That can only be done by invoking drawtext two times. To make sure that
both texts share the same baseline, the
It's missing in the table of contents of the documentation.
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/Also, shouldn't the same change be done also to interpolate_bilinear8? /
I was unable to reproduce with 8-bit input.
When I tested it, the issue was reproducible only with 14-bit and 16-bit input.
12-bit did work.
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Well, I can't see how it looks now, but the sequence white - gray -
white (which is impossible in a sine wave) should no longer be there,
because cos(x) = cos(-x).
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ffmpeg -f lavfi -i zoneplate=kx2=320:ky2=240,format=gray -frames 1 -y
out.png
When you draw a line through the center, you have
black - gray - white - gray - white - gray -black
which means the sine wave changes its sign in the center.
That's why zoneplates are normally calculated with cos()
Isn't it better to use cos() instead of sin()? With sin() there is a
discontinuity in the center.
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please have a look at ticket 2104
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There is still a small problem with the random generator, but this has
nothing to do with the recent changes.
If the random() expression is used in the geq filter, then multiple
pixels get the same sequence of random numbers.
As can be shown with this command, where the frame has only two
It works until move or resize the window.
yes, that's right. I didn't notice because I didn't try to move or resize the
window.
My point is: Removing SDL would break many examples that can be found in the
internet.
Michael
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I didn't notice any problems with -f sdl2. I just tested again with
Windows 11 and the latest FFmpeg build from Gyan, just 2 days old.
ffmpeg -re -f lavfi -i testsrc2=s=800x600 -t 10 -f sdl2 -
Works without any problems.
Michael
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> Possible address trac issue:
http://trac.ffmpeg.org/ticket/10763
I don't like the random generator as it is, because the first two random numbers
are very close to zero, as can be shown with this command line:
ffmpeg -loglevel repeat -f lavfi -i nullsrc=size=1x1,format=gray -vf
On one hand, it's good that the 10 variables for ld() and st() are
initialized with zero.
But on the other hand, zero is obviously the worst possible seed value
for the random generator.
For example, make a 1000x1000 image with red color, and then fill one
pixel at a random position with
Possible better algorithm for the random generator, which might fix the
problem:
eval.c line 235
if (r == 0)
r = UINT64_MAX/13;
else
r = r*1664525+1013904223;
Michael
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Perhaps the regex search is performed on the rendered text as opposed to
the source text? Taking the spam comment on #2104 as an example, the
spammer appears to be using the `[ ]` or
`[[|]]` markup, therefore `http` does not appear in
the rendered text.
But on the other hand, the regex
I haven't seen the original email so I don't know, but I think it
might be a character code issue.
Example:
Comment 14 in ticket 2104 contains "Great" and "amazing" and "http" in
the same line.
But the regex filter didn't match.
Michael
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Are you talking based on the source of the email message?
I don't have the messages as email. I see only the comments in the trac
timeline:
https://trac.ffmpeg.org/timeline
Michael
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Am 03.12.2023 um 09:39 schrieb Michael Koch:
please delete:
comment 14 in ticket 2104
comment 6 in ticket 2776
user "bunnybellid"
I have updated the regex search patterns.
Does anybody know why the last regex seach pattern in the list doesn't work?
I thought it should ma
please delete:
comment 14 in ticket 2104
comment 6 in ticket 2776
user "bunnybellid"
I have updated the regex search patterns.
Michael
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To
Removing SDL2 sounds like a very bad idea. There are many examples which
are using these output devices, and all these examples would be broken.
A quick search in my book
http://www.astro-electronic.de/FFmpeg_Book.pdf
finds about 40 occurences for "-f sdl" or "-f sdl2".
Michael
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