Hello all,
I want to hstack a video with a delayed version of itself.
First test:
ffmpeg -f lavfi -i testsrc2=size=600x400:duration=10 -y test1.mp4
This produces a video of 10 seconds length. The clock is running from 0
to 10, as expected.
Second test:
ffmpeg -f lavfi -i
I am facing issue while cropping the video. i am using the following
command to crop the video it is working perfect for land scap videos but
for portrait video it is always crop to top.
Please help in this
potrait
top
-y-ss00:00.0-i input.mp4-t00:06.235-vfcrop=480:480:240:0:exact=0
Am 29.07.2019 um 06:57 schrieb Gyan:
On 28-07-2019 11:04 PM, Michael Koch wrote:
Hi all,
I just tried this command line and it crashes FFmpeg:
ffmpeg -i meteor308.mp4 -vf fade=in:0:0.5 -q:v 1 -y 308.mp4
I already know what's wrong. I thought the fade duration is expressed
in seconds
Hi all,
I just tried this command line and it crashes FFmpeg:
ffmpeg -i meteor308.mp4 -vf fade=in:0:0.5 -q:v 1 -y 308.mp4
I already know what's wrong. I thought the fade duration is expressed in
seconds. But (with this syntax) it must be expressed in frames and must
be an integer. It would
Am 10.06.2019 um 15:43 schrieb Paul B Mahol:
On 6/10/19, Michael Koch wrote:
Am 10.06.2019 um 13:11 schrieb Paul B Mahol:
Can not reproduce.
Make sure that audio is not taken in output duration.
I did remove the audio track from the input video, but the problem is
still the same.
Provide
Am 10.06.2019 um 13:11 schrieb Paul B Mahol:
Can not reproduce.
Make sure that audio is not taken in output duration.
I did remove the audio track from the input video, but the problem is
still the same.
Provide your input file by uploading it somewhere.
Hi all,
I want to delay a video in a filter chain by 5 seconds, and then combine
it with the original video with hstack. I use the shortest=1 option, so
that the output contains only the duration where both videos overlap:
ffmpeg -f lavfi -i testsrc=duration=10:size=vga:rate=25
Hi,
in the documentation for the blend filter is written:
"By default, the output terminates when the longest input terminates."
What's used as input when the shortest input has terminated? Is the last
frame of the shorter input duplicated?
Is there a trick to let the output terminate when the
Or the fps filter.
This filter and the r option have different algorithms that have advantages
(and disadvantages) in different situations.
Are the differences explained somewhere in the documentation?
Michael
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Am 13.05.2019 um 12:04 schrieb Ben via ffmpeg-user:
From *.jpg pictures I know that there is a hidden header which
contains e.g. info about the original creation time of the picture/photo.
Is there something similar in *.MP4 video files?
yes, and you can view the data with exiftool:
Am 15.04.2019 um 18:10 schrieb Gyan:
Hi Michael,
I'll look at these in detail later on, but just to touch on one point..
On 15-04-2019 06:15 PM, Michael Koch wrote:
"eq" filter:
-- It might be helpful to add a note that multiple eq filters can be
cascaded, for example i
Feature request:
-- Decay filter, makes short flashes of light appear longer, with an
exponential decay curve. Like on an analog oscilloscope screen with long
persistence time. Could be used for videos of the night sky to make fast
meteors appear longer. Should work as follows:
For each pixel
Am 27.04.2019 um 13:07 schrieb Carl Eugen Hoyos:
2019-04-27 0:41 GMT+02:00, Michael Koch :
I'd like to report a problem when loading large PGM files,
which are required for the remap filter.
These files are loading extremely slow in the latest ffmpeg version.
Much slower than a few weeks
, all these are much
slower.
I'm testing on the same computer with the same command line and same
input file, of course.
On my computer it's reproducible.
Michael
--
**
ASTRO ELECTRONIC Dipl.-Ing. Michael Koch
Raabestr. 43 37412 Herzberg
Hi,
I'd like to report a problem when loading large PGM files, which are
required for the remap filter.
These files are loading extremely slow in the latest ffmpeg version.
Much slower than a few weeks before.
I found out that the problem began between April 10 and 11.
The PGM file that I
Am 24.04.2019 um 10:43 schrieb Ulf Zibis:
Am 23.04.19 um 11:43 schrieb Jon bae:
Makes it a different when I denoise after scaling a video, or is the
quality better when I denoise before scaling.
In terms of speed it would be better for me, denoising after scaling, but
when the quality is
Am 23.04.2019 um 11:43 schrieb Jon bae:
Hello,
I just have an general question:
As I know denoiser are specialized to specific noise pattern.
Makes it a different when I denoise after scaling a video, or is the
quality better when I denoise before scaling.
In terms of speed it would be better
. Michael Koch
Raabestr. 43 37412 Herzberg
www.astro-electronic.de
Tel. +49 5521 854265 Fax +49 5521 854266
**
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While some of your suggestions will not be accepted (for example
to document for some filters that they can be concatenated),
Why not? atempo does it.
I suspect nearly all filters can be concatenated and given that the
documentation is already hard to read, I don't think it should be
Am 15.04.2019 um 15:59 schrieb Paul B Mahol:
Feature request:
-- Decay filter, makes short flashes of light appear longer, with an
exponential decay curve. Like on an analog oscilloscope screen with long
persistence time. Could be used for videos of the night sky to make fast
meteors appear
Am 15.04.2019 um 14:55 schrieb Carl Eugen Hoyos:
2019-04-15 14:45 GMT+02:00, Michael Koch :
over the last months I've collected a list what's missing in
FFmpeg's documentation.
While some of your suggestions will not be accepted (for example
to document for some filters that they can
Hi all,
over the last months I've collected a list what's missing in FFmpeg's
documentation.
At the end of the list there are a few feature requests.
"amplify" filter:
-- Many options are in the [0..65535] range. It's unclear how these
options must be set for 8-bit videos. Is it [0..255] in
Am 23.03.2019 um 12:00 schrieb Rex East:
On Sat, Mar 23, 2019 at 7:46 PM Michael Koch
wrote:
As far as I know, rotating without re-encoding isn't possible. Try this:
ffmpeg -i input.webm -vf rotate=PI/2 output.webm
Thank you Michael for the reply and information.
However, that command
ffmpeg -i input.webm -c copy -metadata:s:v:0 rotate=90 output.webm
As far as I know, rotating without re-encoding isn't possible. Try this:
ffmpeg -i input.webm -vf rotate=PI/2 output.webm
Michael
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Am 11.03.2019 um 09:01 schrieb Gerardo Ballabio:
Ok, thank you Michael. I'll try haldclut then. This means I have to do
some research into Gimp too...
For the described workflow you can also use any other graphics program,
if it can read and write uncompressed or lossless compressed images
Am 10.03.2019 um 22:05 schrieb Michael Koch:
Am 10.03.2019 um 21:33 schrieb Gerardo Ballabio:
Thank you Michael -- but that means I still have to find good values
of brightness, contrast, gamma, saturation and hue to use with Gimp.
When I've done that, then couldn't I just apply the same values
Am 10.03.2019 um 21:33 schrieb Gerardo Ballabio:
Thank you Michael -- but that means I still have to find good values
of brightness, contrast, gamma, saturation and hue to use with Gimp.
When I've done that, then couldn't I just apply the same values in
ffmpeg using the "eq" filter?
That won't
Am 10.03.2019 um 08:22 schrieb Venkateswaran.S:
Hi all,
I wants to detect glitches in my video. Is there any filter to achieve it.?
How does the glitch look like? It it's black, you could try the
blackdetect or blackframe filters.
Michael
___
Am 09.03.2019 um 19:14 schrieb Gerardo Ballabio:
Hello all,
I have a video that was filmed under bad lighting conditions, the
background is too bright and people in the foreground are dark. I'm
trying to use ffmpeg to correct it. Please kindly help me.
For video processing like this you best
ELECTRONIC Dipl.-Ing. Michael Koch
Raabestr. 43 37412 Herzberg
www.astro-electronic.de
Tel. +49 5521 854265 Fax +49 5521 854266
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It like to try some tweaks with fillborders filter, so I need some
16-bit per plane images for testing. Can you help me with that?
You can make 16-bit images with the latest version of GIMP. Use "export
as", then use *.png as filename, then select "16bpc RGB" as pixel
format, then click on
Am 06.03.2019 um 21:53 schrieb Paul B Mahol:
On 3/6/19, Michael Koch wrote:
Am 06.03.2019 um 20:45 schrieb Paul B Mahol:
Your interpretation of test results is invalid.
You should count frames.
Well, I did run the video in VLC and measure the duration with a
stopwatch, and it is 5 seconds
Am 06.03.2019 um 20:45 schrieb Paul B Mahol:
Your interpretation of test results is invalid.
You should count frames.
Well, I did run the video in VLC and measure the duration with a
stopwatch, and it is 5 seconds. Below is the FFprobe output.
How can I count the frames?
Old fashioned way -
Am 06.03.2019 um 20:17 schrieb Paul B Mahol:
On 3/6/19, Michael Koch wrote:
Am 06.03.2019 um 17:12 schrieb Paul B Mahol:
On 3/6/19, Michael Koch wrote:
I'd like to know which frames does the tmix filter use for averaging.
Let's assume tmix=frames=9.
To make the n_th frame of the output
Am 06.03.2019 um 17:12 schrieb Paul B Mahol:
On 3/6/19, Michael Koch wrote:
I'd like to know which frames does the tmix filter use for averaging.
Let's assume tmix=frames=9.
To make the n_th frame of the output video, does it use input frames n-8
to n, or n-4 to n+4, or n to n+8?
How does
It end up in endless encoding...
If audio and video come from the same source, then don't they have
already the same length?
Michael
--
**
ASTRO ELECTRONIC Dipl.-Ing. Michael Koch
Raabestr. 43 37412 Herzberg
www.astro-electroni
Am 25.02.2019 um 15:34 schrieb Michael Koch:
Which is the recommended filter for a very strong contrast
enhancement, up to a factor of 10?
The eq=contrast=... filter allows only a maximum of 2. Could this be
changed to allow higher values?
As a workaround I'm using 3 or 4 cascaded eq filters
Am 25.02.2019 um 15:58 schrieb Paul B Mahol:
On 2/25/19, Michael Koch wrote:
Which is the recommended filter for a very strong contrast enhancement,
up to a factor of 10?
The eq=contrast=... filter allows only a maximum of 2. Could this be
changed to allow higher values?
As a workaround I'm
Which is the recommended filter for a very strong contrast enhancement,
up to a factor of 10?
The eq=contrast=... filter allows only a maximum of 2. Could this be
changed to allow higher values?
As a workaround I'm using 3 or 4 cascaded eq filters.
I did also try
Am 22.02.2019 um 23:37 schrieb Paul B Mahol:
On 2/17/19, Michael Koch wrote:
Am 17.02.2019 um 22:12 schrieb Paul B Mahol:
On 2/17/19, Michael Koch wrote:
The threshold option in the "amplify" filter suppresses large
differences. In my opinion it would make more sense to have
Am 17.02.2019 um 22:12 schrieb Paul B Mahol:
On 2/17/19, Michael Koch wrote:
The threshold option in the "amplify" filter suppresses large
differences. In my opinion it would make more sense to have a (second)
threshold option for suppressing small differences, for example noise. I
The threshold option in the "amplify" filter suppresses large
differences. In my opinion it would make more sense to have a (second)
threshold option for suppressing small differences, for example noise. I
mean alter the source pixel only if the difference is greater than the
threshold value.
How can one use ffmpeg to tilt it back upright.
use the rotate filter:
https://www.ffmpeg.org/ffmpeg-all.html#rotate
Michael
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Am 02.02.2019 um 19:34 schrieb Michael Koch:
Am 02.02.2019 um 19:28 schrieb Paul B Mahol:
On 2/2/19, Michael Koch wrote:
Am 02.02.2019 um 19:01 schrieb Paul B Mahol:
On 2/2/19, Michael Koch wrote:
Hi all,
I have two suggestions for improvement:
1. It would be nice if the curves filter
Am 02.02.2019 um 19:28 schrieb Paul B Mahol:
On 2/2/19, Michael Koch wrote:
Am 02.02.2019 um 19:01 schrieb Paul B Mahol:
On 2/2/19, Michael Koch wrote:
Hi all,
I have two suggestions for improvement:
1. It would be nice if the curves filter could import curves files from
GIMP. GIMP can
Am 02.02.2019 um 19:01 schrieb Paul B Mahol:
On 2/2/19, Michael Koch wrote:
Hi all,
I have two suggestions for improvement:
1. It would be nice if the curves filter could import curves files from
GIMP. GIMP can export curves files in two different formats, either the
default format
Hi all,
I have two suggestions for improvement:
1. It would be nice if the curves filter could import curves files from
GIMP. GIMP can export curves files in two different formats, either the
default format or the "old curves file format". For the old format I
have a selfmade C# converter to
Am 14.01.2019 um 09:48 schrieb Paul B Mahol:
On 1/14/19, Michael Koch wrote:
Am 14.01.2019 um 08:40 schrieb Michael Koch:
Am 14.01.2019 um 07:28 schrieb Michael Koch:
When I create a color-look-up-table with this command line, the
result is a 512x512 clut saved as 16-bit PNG. It works
Am 14.01.2019 um 08:40 schrieb Michael Koch:
Am 14.01.2019 um 07:28 schrieb Michael Koch:
When I create a color-look-up-table with this command line, the
result is a 512x512 clut saved as 16-bit PNG. It works as expected
and I checked that the top left pixel is black (R=0, G=0, B=0
Am 14.01.2019 um 07:28 schrieb Michael Koch:
When I create a color-look-up-table with this command line, the result
is a 512x512 clut saved as 16-bit PNG. It works as expected and I
checked that the top left pixel is black (R=0, G=0, B=0) and the
bottom right pixel is white (R=65026, G=65026
When I create a color-look-up-table with this command line, the result
is a 512x512 clut saved as 16-bit PNG. It works as expected and I
checked that the top left pixel is black (R=0, G=0, B=0) and the bottom
right pixel is white (R=65026, G=65026, B=65026).
c:\ffmpeg\ffmpeg -f lavfi -i
Am 08.01.2019 um 14:38 schrieb Herndon Elliott:
Zoneminder using ffmpeg to produce short video from compilation of jpeg
images. Version info is in the log below. Resulting video has flashing
green covering about 2/3 of image.
Example of output video is here:
Sounds good, but with
$ ffmpeg -i CYD_6m_copy.vob -movflags +faststart -vf
"fillborders=top=1" -c:v libx264 -c:a copy CYD_6m_fill-top_H.264.mp4
I get:
[AVFilterGraph @ 0x55a6153dafa0] No such filter: 'fillborders'
With the latest Windows 64-bit version from Zeranoe it's working.
Michael
I found a problem while I was experimenting with the haldclut filter.
But it's simpler to reproduce without haldclut. The input video contains
10 seconds of noise (10-bit) and can be downloaded here (2MB):
http://www.astro-electronic.de/x.mov
My command line compares two cases with hstack.
Am 30.12.2018 um 13:20 schrieb Paul B Mahol:
On 12/30/18, Michael Koch wrote:
Am 28.12.2018 um 11:46 schrieb Paul B Mahol:
One can now use afftfilt to shift frequencies around in frequency domain.
It should be easier than using amultiply filter.
c:\ffmpeg\ffmpeg -f dshow -channels 2 -i audio
Am 28.12.2018 um 11:46 schrieb Paul B Mahol:
One can now use afftfilt to shift frequencies around in frequency domain.
It should be easier than using amultiply filter.
c:\ffmpeg\ffmpeg -f dshow -channels 2 -i audio="Mikrofon (Realtek High
Definiti" -af
Works fine here (unless I add funny characters) here with Windows
cmd, both with and without using a batch file.
Finally it's working here. This is the content of the batch file:
c:\\ffmpeg\ffmpeg -i 699.mp4 -f nut - | c:\\ffmpeg\ffplay -
-- all backslashes
-- no escape character before |
Might it be part of the problem that I'm starting ffmpeg from a batch file?
This is the content of the batch file:
c://ffmpeg/ffmpeg -i 699.mp4 -f nut - ^| c://ffmpeg/ffplay -
Why did you add the caret?
I thought that in a batch file the | character must be escaped with a ^
character. As
Might it be part of the problem that I'm starting ffmpeg from a batch
file?
This is the content of the batch file:
c://ffmpeg/ffmpeg -i 699.mp4 -f nut - ^| c://ffmpeg/ffplay -
pause
I just found out that when using this command in a batch file, it
doesn't matter if the slashes are forward
Am 29.12.2018 um 20:53 schrieb Reino Wijnsma:
On 29-12-2018 20:19, Michael Koch wrote:
F:\Sound\Ultraschall_Konvertierung>c://ffmpeg/ffmpeg -i 699.mp4 -f nut - | c://f
fmpeg/ffplay -
Have you actually tested this at all? Forward slashes don't work on Windows!
Sure I tested this. I pos
Am 29.12.2018 um 20:19 schrieb Michael Koch:
I would use the practical nut container, and do:
$ ffmpeg -i input -f nut - | ffplay -
F:\Sound\Ultraschall_Konvertierung>c://ffmpeg/ffmpeg -i 699.mp4 -f nut
- | c://f
fmpeg/ffplay -
ffmpeg version N-91960-g63c69d51c7 Copyright (c) 2000-2
I would use the practical nut container, and do:
$ ffmpeg -i input -f nut - | ffplay -
F:\Sound\Ultraschall_Konvertierung>c://ffmpeg/ffmpeg -i 699.mp4 -f nut -
| c://f
fmpeg/ffplay -
ffmpeg version N-91960-g63c69d51c7 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 8.2.1
1,lowpass=f=1,lowpass=f=1" -t 10 -f mp3 pipe:play -
//ffmpeg/ffplay
The syntax looks broken here:
Do you want to use a named pipe "play"?
Iiuc, you have to create this pipe before launching FFmpeg,
no need to specify a second output url.
Or you want to use the pipe "-", in this
Am 28.12.2018 um 10:18 schrieb Carl Eugen Hoyos:
2018-12-28 10:14 GMT+01:00, Michael Koch :
Am 28.12.2018 um 00:50 schrieb Moritz Barsnick:
On Thu, Dec 27, 2018 at 20:29:34 +0100, Michael Koch wrote:
I think the bigger problem is "outputting through the computers
speakers". As far
Am 28.12.2018 um 00:50 schrieb Moritz Barsnick:
On Thu, Dec 27, 2018 at 20:29:34 +0100, Michael Koch wrote:
I think the bigger problem is "outputting through the computers
speakers". As far as I know it depends on the operating system, and
under Windows it's impossible.
You can a
Am 27.12.2018 um 20:18 schrieb Carl Eugen Hoyos:
2018-12-27 19:01 GMT+01:00, alex jamshedi :
My goal is to receive a live audio stream that is being sampled at
131,072 Hz and re-sample it at 44.1 kHz before outputting it
through my computers speakers. Is this a task ffmpeg can perform?
Yes,
Is it possible to extract a single frame from a 10 bit video and save it
lossless as a 16 bit PNG file? Unfortunately the documentation for the
PNG video encoder is very short.
Or is any other image format with 10 or more bits supported?
Michael
___
I have two video cameras recording an event 30 minutes long. I hit
start on the two cameras at different times. I would like to figure
out a command-line script that can basically diff the audio to figure
out the difference between the start times and align the videos. The
audio won't be
Am 02.12.2018 um 14:08 schrieb Michael Koch:
Is there any free software for creating or editing files for the lut3d
filter?
In the meantime I found a nice *.cube generator tool here:
https://generator.iwltbap.com/
My next question is about the lut1d filter. Unfortunately I didn't find
much
Is there any free software for creating or editing files for the lut3d
filter?
Thanks,
Michael
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Alternately, change your "Run ffprobe.bat" batchfile to this:
@echo off
c:\ffmpeg\ffprobe %1
pause
The %1 takes the name of the filename you drag-and-drop onto the
batchile icon, if running from the desktop, or type after the batchfile,
if operating from the CLI.
Then, drag your MP4 on to
Yes, open CMD,then drag and drop the batch file into the terminal window
and press Enter.
Or just run ffprobe directly in the terminal.
I was looking for a faster solution, without having to write video's
name and path into the batch file, or into the CMD window. Just drag and
drop and then
My question is how to use ffprobe on a Windows7 system. So far, I've
used the following three step procedure:
1. create or edit a batch file which contains two lines:
c://ffmpeg/ffprobe myvideo.mp4
pause
2. save the batch file
3. start the batch file
This works fine but it's time
Am 11.11.2018 um 20:50 schrieb Balint Marton:
Hi,
Does ffmpeg has support for some kind of non linear scaling, e.g.
scaling/steching the side of the picture more than the middle?
have a look at the remap filter
Michael
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Could find no file with path 'res_%d.png' and index in the range 0-4
res_%d.png: No such file or directory
So the filenames start from res_05.png till res_180.png but there are some
files missing in between like res_13.png etc.
Would that be a problem?
The problem is that you have a
Am 03.10.2018 um 13:23 schrieb Paul B Mahol:
On 10/3/18, Michael Koch wrote:
Am 03.10.2018 um 12:28 schrieb DopeLabs:
im not sure if windows has the ability to 'pipe' like a *nix system does..
but this works to pipe the output of ffmpeg to ffplay instead of a file..
hope this helps
s
system.
Michael
--
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ASTRO ELECTRONIC Dipl.-Ing. Michael Koch
Raabestr. 43 37412 Herzberg
www.astro-electronic.de
Tel. +49 5521 854265
oh no, I don't want to learn a new command line syntax only to solve
this simple problem.
I have a long ffmpeg command line that's working fine when writing the
output to a file. Is there really no easy way to send the output to the
speakers instead?
It is very easy syntax to learn, you can
I'm still experimenting with the ultrasonic converter. Converting from
one file to another file works without problems:
C:\Users\mkoch\Desktop\Ultrasonic Live>c://ffmpeg/ffmpeg -i
test_15kHz.mp3 -f la
vfi -i aevalsrc="sin(12000*2*PI*t):c=stereo:s=44100" -filter_complex
"[0]volume=
Am 28.09.2018 um 18:30 schrieb esikcalabr...@verizon.net:
I believe I'm getting closer. It doesn't appear to get the 2nd variable.
set /p filename="Enter Unconverted File Name: "
set /p outputfilename="Enter Converted File Name: "
CALL "C:\ffmpeg\bin\ffmpeg.exe" ffmpeg -i %filename%
Am 28.09.2018 um 15:20 schrieb esikcalabr...@verizon.net:
Thank you Michael:
Based on new information, I have revised the script with the following. It
seems to be working a bit better; however, still not there yet. Below is the
new script with output below:
set /p filename = "Enter
e top line of the console
window, then "select all", then "copy".
Michael
--
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ASTRO ELECTRONIC Dipl.-Ing. Michael Koch
Raabestr. 43 37412 Herzberg
www.astro-electronic.de
Tel. +49 552
Am 27.09.2018 um 22:45 schrieb esikcalabr...@verizon.net:
Yes it is there. I can convert by command line but just can't get the batch to
work. I replaced : with " and the screen flashed a 2nd command prompt flashed,
closed and back to enter any key to continue. Nothing happened.
please
Am 27.09.2018 um 22:30 schrieb Michael Koch:
Am 27.09.2018 um 21:33 schrieb esikcalabr...@verizon.net:
Any suggestions in a batch file which would take 2 user defined
variables to
convert an audio file? I have drafted the below which so far does
not work.
echo off
set /p filename
Am 27.09.2018 um 21:33 schrieb esikcalabr...@verizon.net:
Any suggestions in a batch file which would take 2 user defined variables to
convert an audio file? I have drafted the below which so far does not work.
echo off
set /p filename = "Enter Unconverted File Name: "
set /p
r_version : 538247680
compatible_brands: qt CAEP
com.apple.quicktime.make: Canon
com.apple.quicktime.model: Canon EOS 5D Mark IV
com.apple.quicktime.rating.user: 0.00
com.apple.quicktime.author: Michael Koch
creation_time : 2018-09-14T18:20:37.00Z
Duration: 00:00:53.00, start: 0.
Am 16.09.2018 um 22:25 schrieb Paul B Mahol:
On 9/16/18, Michael Koch wrote:
Filter inputs will be auto-converted from any non-float formats to
float or double one. Float/double formats are in [-1 .. +1] interval.
Thank you very much for the amultiply filter, it works great!
Here
Filter inputs will be auto-converted from any non-float formats to
float or double one. Float/double formats are in [-1 .. +1] interval.
Thank you very much for the amultiply filter, it works great!
Here is an example for an ultrasonic converter which downconverts the
15kHz - 25kHz band to
Am 15.09.2018 um 09:33 schrieb Gyan:
On Sat, Sep 15, 2018 at 12:13 PM Michael Koch
wrote:
Which other filter can I use to convert the input to -1..+1 interval,
and convert the output back to 16bit or 24bit interval? I saw that the
multiply filter in sox has these normalizations already
yes, two inputs and one output. I think it would be best if it works
independant of bit depth. First normalize the input signals to -1...+1
range, then multiply them so that the result is also in the -1...+1
range, then normalize back to 16bit or 24bit range.
It will internally work with
Am 12.09.2018 um 09:55 schrieb Paul B Mahol:
Hi,
On 9/12/18, Michael Koch wrote:
Is it possible to multiply audio samples from two sources?
I'd like to downconvert the 15kHz to 25kHz range to the 0 to 10kHz
range. First apply a strong 15kHz highpass filter, then multiply the
signal
Is it possible to multiply audio samples from two sources?
I'd like to downconvert the 15kHz to 25kHz range to the 0 to 10kHz
range. First apply a strong 15kHz highpass filter, then multiply the
signal with a 15kHz sine wave (which produces sum and difference
signals), then apply a 10kHz
Am 10.09.2018 um 12:32 schrieb Vukan:
I am merging an image sequence into a video using the following command:
ffmpeg -f image2 -i "input\image%09d.png" -framerate 60 output.mp4
However, the framerate of the output video is always 25, no matter what I
set as -framerate argument. What is going
Am 27.08.2018 um 15:00 schrieb Paul B Mahol:
On 8/27/18, Michael Koch wrote:
In the first example I have two identical 1kHz sine sources. The first
source is delayed by 0.5ms (which means 180DEG phase shift), and then both
channels are mixed. This works as expected, the result is silence
In the first example I have two identical 1kHz sine sources. The first
source is delayed by 0.5ms (which means 180° phase shift), and then both
channels are mixed. This works as expected, the result is silence.
ffmpeg -f lavfi -i sine=f=1000:d=5 -f lavfi -i sine=f=1000:d=5
-filter_complex
Am 13.08.2018 um 10:08 schrieb Joshua Grauman:
Hi all,
I am combining various effects, and I noticed that when I fade in a
video
using the [in]fade=t=in:st=2:n=24[out] syntax, and I fade in text using
alpha='if(lt(t,2),0,if(lt(t,3),t-2,1))', that they both fade in
roughly at
the same time,
Am 07.08.2018 um 09:54 schrieb Michael Koch:
F:\xxx>c:/ffmpeg/ffmpeg -i temp%4d.jpg -vf lutyuv="y=0.9*val"
-frames 10 -q:v 1 -start_number 1 temp%4d.jpg
FFmpeg does not edit files in-place. Input and output have to be
different.
Let's assume I have a complex filter with s
F:\xxx>c:/ffmpeg/ffmpeg -i temp%4d.jpg -vf lutyuv="y=0.9*val"
-frames 10 -q:v 1 -start_number 1 temp%4d.jpg
FFmpeg does not edit files in-place. Input and output have to be
different.
Input and output are different. Input starts with number 0, and output
starts with number 1.
luminance = 0.95 * luminance_in_last_frame; // exponential decay
I'm trying to do the following:
Read image temp.jpg, set luminance to 90%, write as temp0001.jpg
Read image temp0001.jpg, set luminance to 90%, write as temp0002.jpg
and so on in an iterative process, until 10 images are
Every time when the input becomes brighter than the last output frame,
the output is set to the input value. If input is below the last output
value, then exponential decay.
I have a timelapse video of the night sky with meteors. Each meteor is
visible only in one frame. I'd like to make them
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