I have a strange problem with extracting alpha plane from an grayscale
PNG with alpha channel.
So I have an image with alpha in it and use this command:
ffmpeg -i 1-open-patch.png -vf alphaextract -pix_fmt gray testgray_alpha.png
or
ffmpeg -i 1-open-patch.png -vf alphaextract
Hi,
[Offtopic]
I am using the online documentation a lot, especially
this page https://ffmpeg.org/ffmpeg-filters.html
Frankly, I find the site quite hard to read.
(IMO, so please don't take as offense)
I have published a userstyle for Firefox (with Stylish plugin)
that adresses the issues and
James Girotti wrote:
> On Tue, Oct 10, 2017 at 4:40 PM, Mikhail V wrote:
>
> > Currently it is possible to delete the input file if I specify same
> > filename in output,
> > for example:
> >
> > ffmpeg -y -i input input
> >
>
> Aren't you specify
Sometimes I get a warning:
> Warning: data is not aligned! This can lead to a speedloss
"Speedloss" should be "speed loss" I suppose?
Mikhail
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To
for all input frame rows
So the output frame will be filled with the average color of input
frame row-wise.
Is there such filter or something similar so I can get similar results?
Regards,
Mikhail V
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On 10/11/2016 2:24 PM, Mikhail V wrote:
On 10/9/2016 12:24 AM, Xen wrote:
Is there any way in Linux to obtain an accurate frame/time number
through a GUI that can be used with ffmpeg?
I know Avidemux hardly works at all, VLC will not reliably show frames.
Pitivi is not an option, I haven't
On 10/9/2016 12:24 AM, Xen wrote:
Is there any way in Linux to obtain an accurate frame/time number
through a GUI that can be used with ffmpeg?
I know Avidemux hardly works at all, VLC will not reliably show frames.
Pitivi is not an option, I haven't tried Kdenlive because it crashed
the
On 8 October 2016 at 00:31, Carl Eugen Hoyos <ceffm...@gmail.com> wrote:
> 2016-10-08 0:01 GMT+02:00 Mikhail V <mikhail...@gmail.com>:
>> BTW after that manipulations a fair question arizes: why
>> ffmpeg does not support something like:
>> "... -f image2 -i
> You can do:
> $ ffmpeg -i input -vcodec copy -f image2 frame%4d
>
> Now make symbolic links to every second frame but
> with sequential numbers (Don't ask me how).
> $ ffmpeg -f image2 -vcodec dnxhd -i linked_frames%4d -vcodec copy out.mxf
> (25fps is the default for the image2 demuxer, use
On 6 October 2016 at 10:07, Carl Eugen Hoyos <ceffm...@gmail.com> wrote:
> 2016-10-05 23:08 GMT+02:00 Mikhail V <mikhail...@gmail.com>:
>> On 5 October 2016 at 19:55, Carl Eugen Hoyos <ceffm...@gmail.com> wrote:
>>> 2016-10-05 15:45 GMT+0
On 5 October 2016 at 19:55, Carl Eugen Hoyos <ceffm...@gmail.com> wrote:
> 2016-10-05 15:45 GMT+02:00 Mikhail V <mikhail...@gmail.com>:
>
>> Is it possible that ffmpeg cannot do this without re-encoding?
>
> You can export single frames and delete half of them us
On 5 October 2016 at 18:06, Erik Dobberkau wrote:
>> Hello,
>>
>> I have a camera recording which is an MXF file and the codec is DNxHD
>> I suppose it is a single-frame codec so literally it is a container of
>> images which are independently stored in the file.
>>
Hello,
I have a camera recording which is an MXF file and the codec is DNxHD
I suppose it is a single-frame codec so literally it is a container of
images which are independently stored in the file.
Recordings are taken at 50 fps progressive.
Now what I want is to extract only half of the frames,
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