Hello all,
I just created a special effect which shows several optical sound
tracks, like in cine film.
The output video is perfectly ok and has the correct length 20s. But
FFmpeg doesn't stop after it has written the output file. I have to
terminate it with ctrl-c, and I don't understand why.
Am 17.03.2021 um 19:31 schrieb Steven Kan:
On Mar 6, 2021, at 11:22 AM, Steven Kan wrote:
On Mar 5, 2021, at 2:00 PM, Michael Koch wrote:
Am 05.03.2021 um 20:33 schrieb Steven Kan:
I’d like to assemble these videos, side-by-side, but synced in time, which
means the TrailDown video needs to
Am 20.03.2021 um 04:31 schrieb Mark Filipak (ffmpeg):
: : :
: : Specify scale, if it is set it will be
multiplied with sum of each weight multiplied with pixel values to
give final destination pixel value. By default scale is auto scaled to
sum of weig
Am 26.03.2021 um 09:55 schrieb Cecil Westerhof via ffmpeg-user:
I want to publish a speech I gave during a Zoom meeting. But cutting
it out does not work.
When I use:
ffmpeg -y -i 2021-03-25ToastmastersClubAvond.mp4 -ss 1190 -to 1631 -acodec
copy -vcodec copy -async 1 speech.mp4
The video
Am 05.04.2021 um 01:48 schrieb Cecil Westerhof via ffmpeg-user:
I have to cut out a part of a video, crop it and blackout two parts.
I do this with:
ffmpeg -y \
-ss 00:19:49\
-i 2021-03-25ToastmastersCl
Am 05.04.2021 um 11:58 schrieb Cecil Westerhof via ffmpeg-user:
Michael Koch writes:
Am 05.04.2021 um 01:48 schrieb Cecil Westerhof via ffmpeg-user:
I have to cut out a part of a video, crop it and blackout two parts.
I do this with:
ffmpeg -y
Am 08.04.2021 um 09:27 schrieb Rainer M Krug:
ffmpeg -i ‘background_movie.avi' -i 'overlay.avi' -filter_complex
'overlay=0x0’ ‘final_movie.avi’
I think overlay=0x0 is not doing what you expect. It does set the x
option to hexadecimal 0, and it doesn't specify the y option. In your
case that
Am 08.04.2021 um 09:46 schrieb Rainer M Krug:
Hi
I have a series of videos of moving particles (multiple particles per frame /
movie), and would like to add a circle around each particle and add a label. At
the moment I am using a script in R to plot, for each frame, these circles and
labels
Am 08.04.2021 um 11:10 schrieb Rainer M Krug:
Hi Nicolas
On 8 Apr 2021, at 10:58, Nicolas George wrote:
Rainer M Krug (12021-04-08):
I have found “draw_text”
(https://ffmpeg.org/ffmpeg-filters.html#drawtext), but I have no idea
how I could do this. We can assume that I have a text file with
Am 12.04.2021 um 00:39 schrieb Ulf Zibis:
My question is not about head-switching effects, it mainly is about
temporal noise. E.G., there is the hqdn3d filter, which can do both,
spacial and temporal denoise. But I'm missing some guidance about
using the parameters and in comparision to other
Am 13.04.2021 um 21:53 schrieb John Harlow via ffmpeg-user:
RES1=`nice -20 cpulimit -l 400 /usr/bin/ffmpeg -y -hide_banner -loglevel verbose -r 29.97
-i "$TMP" \
I'm not sure, but doesn't the -r option before the input overwrite the
framerate of the input?
Michael
_
Am 22.04.2021 um 12:50 schrieb Ulf Zibis:
Hi,
I want to filter a video from pts 0 to 1999 with filter A, then from
2000 to 2199 with filter B, from 2200 with filter A and finally the
whole stream with filter C.
Can one please give me an example for a working command line?
untested:
ffmpeg
Am 22.04.2021 um 23:27 schrieb Ulf Zibis:
Am 22.04.21 um 13:01 schrieb Michael Koch:
Am 22.04.2021 um 12:50 schrieb Ulf Zibis:
Hi,
I want to filter a video from pts 0 to 1999 with filter A, then from
2000 to 2199 with filter B, from 2200 with filter A and finally the
whole stream with
Am 23.04.2021 um 08:31 schrieb Gyan Doshi:
You may be thinking of the interleave filter. select uses exactly one
input.
you are right and what I wrote was wrong.
Michael
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Am 22.04.2021 um 23:27 schrieb Ulf Zibis:
Am 22.04.21 um 13:01 schrieb Michael Koch:
Am 22.04.2021 um 12:50 schrieb Ulf Zibis:
Hi,
I want to filter a video from pts 0 to 1999 with filter A, then from
2000 to 2199 with filter B, from 2200 with filter A and finally the
whole stream with
Am 23.04.2021 um 13:35 schrieb Nicolas George:
Ulf Zibis (12021-04-23):
I already had checked that. Unfortunately, crop has no timeline support:
How would that work? Enabling or disabling crop changes the output
resolution, which is not supported by libavfilter.
The crop filter could be used
Am 23.04.2021 um 14:05 schrieb Nicolas George:
Michael Koch (12021-04-23):
The crop filter could be used to change the x,y coordinates, with constant
output resolution.
With timeline? Please elaborate?
Please forget what I wrote. It's wrong.
Mi
Am 23.04.2021 um 15:58 schrieb Ulf Zibis:
Am 23.04.21 um 08:07 schrieb Michael Koch:
The "between" function is including at both ends of the interval.
Thanks for the info.
Oh what a pitty ... imagine I set the upper border of the lower range
to 10:23.59, the lower border of
Am 23.04.2021 um 23:19 schrieb Ulf Zibis:
Am 23.04.21 um 08:31 schrieb Gyan Doshi:
On this topic generally, see https://superuser.com/q/1632998/
Much thanks for this hint. I was successful with this approach:
ffmpeg -i 'Stille Tage in Clichy.mpg' -vf
"split=3[a][b][c];[a]trim=0:2888.36,setp
Am 24.04.2021 um 19:24 schrieb Michael Koch:
Am 23.04.2021 um 23:19 schrieb Ulf Zibis:
Am 23.04.21 um 08:31 schrieb Gyan Doshi:
On this topic generally, see https://superuser.com/q/1632998/
Much thanks for this hint. I was successful with this approach:
ffmpeg -i 'Stille Tage in Clich
Am 28.04.2021 um 08:51 schrieb Bo Berglund:
Sometimes when I download a video it turns out to have some issues that has
raised the audio pitch of the video making it not so enjoyable to watch/hear.
So I wonder if there is an ffmpeg command that can modify the pitch of the audio
without changing t
Am 28.04.2021 um 10:53 schrieb Bo Berglund:
On Wed, 28 Apr 2021 09:03:26 +0200, Michael Koch
wrote:
Am 28.04.2021 um 08:51 schrieb Bo Berglund:
Sometimes when I download a video it turns out to have some issues that has
raised the audio pitch of the video making it not so enjoyable to watch
Am 28.04.2021 um 23:34 schrieb Bo Berglund:
On Wed, 28 Apr 2021 11:35:47 +0200, Michael Koch
wrote:
I had tested this (which I found by googling) before I posted:
ffmpeg -i input20.mp4 -filter:a "atempo=1.25" -vn output20.mp4
There were no errors displayed but the resulting
Am 28.05.2021 um 11:25 schrieb Flavio Sartoretto:
I use ffmpeg in order to convert fname.flv video to mp4:
ffmpeg -i fname.flv -c:v mpeg4 -copyts -loglevel verbose fname.mp4
The video quality of my output is bad. How can I improve it?
Add -q:v 1 to your command line. The number does specify th
Am 28.05.2021 um 17:18 schrieb Carl Eugen Hoyos:
This is (nearly) completely wrong:
9 is still high quality, highest compression happens at a much higher value.
Old MEncoder documentation recommends not use a value lower than 2, sane values
start between 5 and 10.
This is an important informat
Am 14.06.2021 um 18:23 schrieb Yann Cainjo:
Hi FFmpeg users
Using FFmpeg to transcode 360 video,
does anyone know if it is possible to inject Spherical metadata (
https://github.com/google/spatial-media/blob/master/docs/spherical-video-rfc.md)
in video header using only FFmpeg,
without using G
However, now that I understand that for 4 seconds transition you need 4
seconds on each video, I don't understand why you need two parameters,
duration and offset. Why not simply define the duration, and have ffmpeg
calculate the offset as videoDuration minus transitionDuration?
I think that'
Am 22.06.2021 um 12:14 schrieb ibur...@compuscience.com:
I concatenate 3 videos as below:
Video 1 - 13 seconds with audio
Video 2 - 4 seconds without audio (I generated this video using xfade
transition
Video 3 - 4 seconds with audio
If I concatenate video 1 and 3 everything works
Am 22.06.2021 um 20:16 schrieb ibur...@compuscience.com:
Have you tried adding (silent) audio to video 2 and trying your join
operation again? You could use `anullsrc':
This is what I am trying to do, but wasn't able to accomplish the first step
which is adding a silent audio to my video using
Am 25.06.2021 um 20:40 schrieb ibur...@compuscience.com:
I'm trying to reduce the size of an mp4 file to adjust it for streaming. The
video is about one minute long and I used the sample command shown in
https://trac.ffmpeg.org/wiki/Encode/YouTube.
The original file size is ~18MB while the
---
Youtube:
r_frame_rate=30/1
avg_frame_rate=30/1
bit_rate=1011745
nb_frames=1847
--
What seems significant to me here is that YouTube reduced the frame rate and
consequently the number of frames to half. The quality of the video still
seems reasona
Am 25.06.2021 um 22:52 schrieb ibur...@compuscience.com:
add -r 30 to your command line
I did that; my new command looks like:
-i HBR_TT747.mp4 -c:v libx264 -preset slow -crf 27 -r 30 -c:a copy -pix_fmt
yuv420p HBR_TT747_Compressed.mp4
And it took it into account, now I have:
r_frame_rate=30/1
Hi Gyan,
As the docs state, the acceptable commands are w, h, x, ,y
so the syntax is
c crop -1 w 100
Is this documented somewhere? I mean typing "c" in the console while
FFmpeg is running.
I know that you mentioned it on stackoverflow some time ago, but I never
found it in the FFmpeg
Am 03.07.2021 um 15:06 schrieb Michael Koch:
Hi Gyan,
As the docs state, the acceptable commands are w, h, x, ,y
so the syntax is
c crop -1 w 100
Is this documented somewhere? I mean typing "c" in the console while
FFmpeg is running.
I know that you mentioned it on sta
Am 03.07.2021 um 15:57 schrieb Alex Christoffer Rasmussen:
thank you for the quick answer
when trying this out I notice 3 things
*1: the original size is kept*
if the starting crop is *crop=h=100 *then using *c crop -1 h 150 *dose
noting and the other way,
What you are trying to do might be i
Hello,
I want to overlay an animated gif over a video. The gif must be looped
because it's much shorter than the video. I did try the "-loop 1"
option, but I get the error message "Option loop not found". However,
the loop option works fine for jpg images. How can an animated gif be
looped?
Am 09.07.2021 um 08:49 schrieb Gyan Doshi:
On 2021-07-09 12:07, Michael Koch wrote:
Hello,
I want to overlay an animated gif over a video. The gif must be
looped because it's much shorter than the video. I did try the "-loop
1" option, but I get the error message "O
Am 13.07.2021 um 10:32 schrieb yaofahua--- via ffmpeg-user:
This command may be helpful.
cat *.jpg | ffmpeg -framerate 1/2 -pattern_type -f image2pipe -i - -filter_complex
"scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1:color=black,format=yuv420p"
-r 30 -movflags +fastst
Am 26.07.2021 um 14:27 schrieb tim.russ...@med-associates.com:
Does FFMPEG support sample rates (using the '-ar' parameter) of 192k?
I don't see it listed in the documentation.
yes that works, here is an example:
ffmpeg -f lavfi -i sine=1000:d=10 -ar 192000 sine.wav
Michael
_
Am 29.07.2021 um 09:12 schrieb Green Koopa:
My input file is yuvj420p(pc, bt709). My target output is
yuv420p(tv, bt709). I would like to use "-pix_fmt +yuv420p"
to specify the output format, and to force me to be explicit
in my conversions in the filtergraph. How do I achieve
explicit conversion
Am 16.08.2021 um 15:28 schrieb Reindl Harald:
with you idiotic phone 50% auf my day would be wasted by swiching apps
and say "ok, all fine there"
can you please continue this discussion off-list
Michael
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Hi,
is it possible to convert the waveform of an entire audio file (or a
segment of it) to a picture?
The "showwavespic" filter has the problem that for each sample it draws
a line from +level to -level. For example, if the input is a +0.5 DC
signal, I can't decide from the output picture if t
Hello,
sometimes it's an iterative process to find the best parameters for a
filter, especially when the filter changes brightness, contrast or colors:
1) Edit the filter parameters in the FFmpeg command line
2) Run FFmpeg
3) Open the output image in a viewer (normally I'm using IrfanView)
4) R
Am 01.09.2021 um 09:30 schrieb Paul B Mahol:
On Wed, Sep 1, 2021 at 9:26 AM Michael Koch
wrote:
Hello,
sometimes it's an iterative process to find the best parameters for a
filter, especially when the filter changes brightness, contrast or colors:
1) Edit the filter parameters in the F
I have two video streams and want to toggle between them in 1 second
intervals. I did try this command:
ffmpeg -i in1.mp4 -i in2.mp4 -lavfi streamselect=map='mod(t,2)' -t 30
out.mp4
This doesn't work because streamselect doesn't accept expressions.
Who has an idea for a workaround?
Thanks,
M
Am 03.09.2021 um 14:21 schrieb Michael Koch:
I have two video streams and want to toggle between them in 1 second
intervals. I did try this command:
ffmpeg -i in1.mp4 -i in2.mp4 -lavfi streamselect=map='mod(t,2)' -t 30
out.mp4
This doesn't work because streamselect
Am 03.09.2021 um 15:09 schrieb Paul B Mahol:
On Fri, Sep 3, 2021 at 3:07 PM Michael Koch
wrote:
Am 03.09.2021 um 14:21 schrieb Michael Koch:
I have two video streams and want to toggle between them in 1 second
intervals. I did try this command:
ffmpeg -i in1.mp4 -i in2.mp4 -lavfi
Am 03.09.2021 um 15:30 schrieb Paul B Mahol:
sendcmd supports expressions.
yes, but it's complicated and doesn't always work.
rem make two images for testing
ffmpeg -f lavfi -i color=yellow -vf
drawtext='text="1":fontcolor=red:fontsize=100:x=140:y=80' -frames 1 -y 1.png
ffmpeg -f lavfi -i
Am 03.09.2021 um 20:01 schrieb Reino Wijnsma:
On 2021-09-03T16:25:50+0200, Michael Koch wrote:
But if I write all in the FFmpeg command line, then it doesn't work:
ffmpeg -loop 1 -i 1.png -loop 1 -i 2.png -lavfi sendcmd=c="0 [expr] streamselect map
'gte(mod(T,2),1)'"
Hello,
this week from Thursday 2021-09-09 to Sunday 2021-09-12 will take place
the 12th "Sankt Andreasberger Teleskoptreffen", that's an event for
amateur astronomers in the Harz Mountains in Germany. You are invited to
observe the night sky and attend our lectures. You can come for one day,
Am 08.09.2021 um 11:44 schrieb Arif Driessen:
about 3 seconds latency.
I have also experimented with these flags: -thread_queue_size, -fflags
nobuffer, -flags low_delay ,-strict experimental, -re, -deadline realtime
Any ideas?
I had a similar problem with the "dshow" input device and solved i
Am 13.09.2021 um 10:42 schrieb Veronica & Stephen McGuckin:
Thank you. Please can you explain a little bit more about what option I should
set.
Regards
-Original Message-
From: ffmpeg-user On Behalf Of Paul B Mahol
Sent: 11 September 2021 16:54
To: FFmpeg user questions
Subject: Re:
Am 18.09.2021 um 18:07 schrieb Cecil Westerhof via ffmpeg-user:
I have several of the following (simplified):
drawtext=
enable = 'between(t, 105, 115)':
text = 'speaker':
y = main_h - (text_h * 4),
drawtext=
enable = 'between(t, 105
Am 18.09.2021 um 18:22 schrieb Michael Koch:
Am 18.09.2021 um 18:07 schrieb Cecil Westerhof via ffmpeg-user:
I have several of the following (simplified):
drawtext=
enable = 'between(t, 105, 115)':
text = 'speaker':
y =
Am 18.09.2021 um 18:51 schrieb Michael Koch:
Am 18.09.2021 um 18:22 schrieb Michael Koch:
Am 18.09.2021 um 18:07 schrieb Cecil Westerhof via ffmpeg-user:
I have several of the following (simplified):
drawtext=
enable = 'between(t, 105, 115)':
text
e I wanted
to have them the placement of the speaker and subject text is on
different heights. Sometimes one or the other is different, sometimes
both and sometimes they are the same.
Is this a bug, or am I doing something wrong?
As Michael Koch said:
The content of the variable "tex
e I wanted
to have them the placement of the speaker and subject text is on
different heights. Sometimes one or the other is different, sometimes
both and sometimes they are the same.
Is this a bug, or am I doing something wrong?
As Michael Koch said:
The content of the variable "tex
Am 19.09.2021 um 12:42 schrieb Cecil Westerhof via ffmpeg-user:
Michael Koch writes:
As Michael Koch said:
The content of the variable "text_h" depends on which characters
you are printing.
So I changed:
drawtext=
enable = 'between(t, 105, 115)&
Am 20.09.2021 um 10:45 schrieb Duncan Robertson:
What is the difference between -framerate and -r?
-framerate is the framerate used for reading in the images.
-r is the output framerate, it's 25 by default if you don't use this
option.
If -framerate is larger than -r, then some frames are dro
Am 20.09.2021 um 21:51 schrieb Paul B Mahol:
On Sat, Oct 17, 2015 at 3:58 PM Michael Koch
wrote:
> That looks like the job for the filter, see inflate, deflate, erosion
and dilation filters.
I just tested the dilation filter. It's a nice workaround if the
downscaling factor is 3:
Am 21.09.2021 um 08:57 schrieb Paul B Mahol:
See new morpho filter, that gonna be in master soon.
It is much faster than current filters and allow custom definition of
structure/mask (rectangle/circle/etc) by using 2nd stream.
I'd like to test it. Please push it.
What's the meaning of "open
I like the sample images for the blend filter that Paul has added here:
https://trac.ffmpeg.org/wiki/Blend
Can you please also share the command line for making these images?
Thanks,
Michael
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Am 30.09.2021 um 19:19 schrieb Paul B Mahol:
On Thu, Sep 30, 2021 at 7:06 PM Michael Koch
wrote:
I like the sample images for the blend filter that Paul has added here:
https://trac.ffmpeg.org/wiki/Blend
Can you please also share the command line for making these images?
mpv av
Am 30.09.2021 um 19:05 schrieb Michael Koch:
I like the sample images for the blend filter that Paul has added here:
https://trac.ffmpeg.org/wiki/Blend
In the documentation for the "opacity" options for the blend filter is
written:
"Only used in combination with pixel compon
Am 05.10.2021 um 07:27 schrieb Shailesh kumar Dangi via ffmpeg-user:
Hi Team,
This is Shailesh Kumar Dangi, Working on Maventus Group Inc. I am
using FFMPEG for video compression for bitrate reduction and I want to
be the same aspect ratio as the original video aspect ratio.
I am facing a proble
Am 05.10.2021 um 08:03 schrieb Shailesh kumar Dangi via ffmpeg-user:
Thanks, Micheal
Here is the command, I am using to reduce the bitrate.
ffmpeg -y -i original.MOV -b:v 4.5M -map_metadata 0:s:0 -c:v libx264
-preset superfast -tune film -ac 2 -c:a aac -maxrate 4M -bufsize 3M -strict
-2 -vf sca
Am 05.10.2021 um 08:33 schrieb Shailesh kumar Dangi via ffmpeg-user:
Hi, Please find below as an attachment. In the attachment input command and
output, the console is there.
Actual Input what i am using
ffmpeg -y -i original.mov -b:v 4.5M -map_metadata 0:s:0 -c:v libx264
-preset superfast -tune
Am 05.10.2021 um 09:07 schrieb Shailesh kumar Dangi via ffmpeg-user:
Yes, In the input video contains some black space around the video as you
can see in the attachment below.
If we pass the scale "-vf scale=1920:1080" then the video will be stretched.
if we do not pass the scale. The scale will
Am 05.10.2021 um 09:54 schrieb Shailesh kumar Dangi via ffmpeg-user:
Hi,
Our final goal is to reduce the bitrate is below 5MB and the Aspect ratio,
height, and width need to be the same.
The bitrate is already below 5Mb/s, look at the end of the console output:
bitrate=3772.4kbits/s
Aspect ra
Am 05.10.2021 um 10:18 schrieb Shailesh kumar Dangi via ffmpeg-user:
Do we have anything to stop rotation?
Try to add the option -noautorotate
Michael
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Am 05.10.2021 um 12:39 schrieb Shailesh kumar Dangi via ffmpeg-user:
Hi,
When I use to stop rotation. -noautorotate. it is working fine in my local
system, But when I upload the code on the Linux server after compression
video itself gets to rotate.
Original Video-
https://maventus-us-east.s3.
Am 05.10.2021 um 12:55 schrieb Shailesh kumar Dangi via ffmpeg-user:
Please find an attachment as a command with the console.
ffmpeg version 2.8.17-0ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
Your FFmpeg version i
Hello,
I have a question about the shuffleplanes filter. In this example the
pixel format is RGB24. So the first plane is red and the second plane is
green. I want to swap the red and green planes.
ffmpeg -f lavfi -i testsrc2 -lavfi
format=rgb24,split[a][b];[b]shuffleplanes=1:0:2[b];[a][b]vs
Am 11.10.2021 um 11:26 schrieb Paul B Mahol:
On Mon, Oct 11, 2021 at 11:15 AM Michael Koch
wrote:
Hello,
I have a question about the shuffleplanes filter. In this example the
pixel format is RGB24. So the first plane is red and the second plane is
green. I want to swap the red and green
I have a question about the "fftfilt" filter. What's the default value
of the weight_U and weight_V options? I'm asking because I get an
unexpected result.
This command line creates my input image for testing:
ffmpeg -f lavfi -i color=black:s=300x50 -lavfi
drawgrid=c=white:y=-1:w=2:h=51,split
Am 12.10.2021 um 18:52 schrieb Paul B Mahol:
On Tue, Oct 12, 2021 at 10:55 AM Michael Koch
wrote:
I have a question about the "fftfilt" filter. What's the default value
of the weight_U and weight_V options? I'm asking because I get an
unexpected result.
This command l
Am 12.10.2021 um 19:29 schrieb Michael Koch:
Am 12.10.2021 um 18:52 schrieb Paul B Mahol:
On Tue, Oct 12, 2021 at 10:55 AM Michael Koch
wrote:
I have a question about the "fftfilt" filter. What's the default value
of the weight_U and weight_V options? I'm asking because
Am 13.10.2021 um 22:57 schrieb Paul B Mahol:
On Wed, Oct 13, 2021 at 10:51 PM Michael Koch
wrote:
Am 12.10.2021 um 19:29 schrieb Michael Koch:
Am 12.10.2021 um 18:52 schrieb Paul B Mahol:
On Tue, Oct 12, 2021 at 10:55 AM Michael Koch
wrote:
I have a question about the "fftfilt&qu
Am 13.10.2021 um 23:09 schrieb Michael Koch:
Am 13.10.2021 um 22:57 schrieb Paul B Mahol:
On Wed, Oct 13, 2021 at 10:51 PM Michael Koch
wrote:
Am 12.10.2021 um 19:29 schrieb Michael Koch:
Am 12.10.2021 um 18:52 schrieb Paul B Mahol:
On Tue, Oct 12, 2021 at 10:55 AM Michael Koch
wrote:
I
Am 13.10.2021 um 23:52 schrieb Michael Koch:
Am 13.10.2021 um 23:09 schrieb Michael Koch:
Am 13.10.2021 um 22:57 schrieb Paul B Mahol:
On Wed, Oct 13, 2021 at 10:51 PM Michael Koch
wrote:
Am 12.10.2021 um 19:29 schrieb Michael Koch:
Am 12.10.2021 um 18:52 schrieb Paul B Mahol:
On Tue
Am 14.10.2021 um 12:07 schrieb Paul B Mahol:
Sorry but I'm not on windows, so I can not use your script.
Then try the below (slightly improved) version. It would become much
simpler with variables:
ARRAY_H = pow(2,ceil(log(ceil(W*10/9))/log(2)))
ARRAY_V = pow(2,ceil(log(ceil(H*10/9))/log(2)))
Am 14.10.2021 um 12:53 schrieb Paul B Mahol:
On Thu, Oct 14, 2021 at 12:29 PM Michael Koch
wrote:
Am 14.10.2021 um 12:07 schrieb Paul B Mahol:
Sorry but I'm not on windows, so I can not use your script.
Then try the below (slightly improved) version. It would become much
simpler
Am 14.10.2021 um 13:01 schrieb Paul B Mahol:
On Thu, Oct 14, 2021 at 12:59 PM Michael Koch
wrote:
Am 14.10.2021 um 12:53 schrieb Paul B Mahol:
On Thu, Oct 14, 2021 at 12:29 PM Michael Koch <
astroelectro...@t-online.de>
wrote:
Am 14.10.2021 um 12:07 schrieb Paul B Mahol:
Sorry b
Am 14.10.2021 um 13:11 schrieb Paul B Mahol:
On Thu, Oct 14, 2021 at 1:08 PM Michael Koch
wrote:
Am 14.10.2021 um 13:01 schrieb Paul B Mahol:
On Thu, Oct 14, 2021 at 12:59 PM Michael Koch <
astroelectro...@t-online.de>
wrote:
Am 14.10.2021 um 12:53 schrieb Paul B Mahol:
On Thu,
Am 14.10.2021 um 13:23 schrieb Paul B Mahol:
On Thu, Oct 14, 2021 at 1:18 PM Michael Koch
wrote:
Am 14.10.2021 um 13:11 schrieb Paul B Mahol:
On Thu, Oct 14, 2021 at 1:08 PM Michael Koch <
astroelectro...@t-online.de>
wrote:
Am 14.10.2021 um 13:01 schrieb Paul B Mahol:
On Thu,
Am 14.10.2021 um 13:29 schrieb Michael Koch:
Am 14.10.2021 um 13:23 schrieb Paul B Mahol:
On Thu, Oct 14, 2021 at 1:18 PM Michael Koch
wrote:
Am 14.10.2021 um 13:11 schrieb Paul B Mahol:
On Thu, Oct 14, 2021 at 1:08 PM Michael Koch <
astroelectro...@t-online.de>
wrote:
Am 14.10.2
Am 14.10.2021 um 16:13 schrieb Michael Koch:
This is the command line for the lowpass filter, where the filter
freqency isn't a function of input size. The constant "8" is the
filter wavelength in pixels per linepair.
ffmpeg -i test.png -vf
scale=2*iw:2*ih,fftfilt=dc_Y=
Am 14.10.2021 um 23:34 schrieb Michael Koch:
Am 14.10.2021 um 16:13 schrieb Michael Koch:
This is the command line for the lowpass filter, where the filter
freqency isn't a function of input size. The constant "8" is the
filter wavelength in pixels per linepair.
ffmpeg
Am 01.11.2021 um 16:21 schrieb LianCheng Tan:
Hi,
Beside using textfile (reload=1) in drawtext for dynamic text, is there any
other method to add dynamic texts onto the video stream?
You could use subtitles. It's described in the wiki:
https://trac.ffmpeg.org/wiki/WikiStart
There are also so
Am 01.11.2021 um 15:15 schrieb PPRJ01:
Hello All,
I have been using ffmpeg for two years and I would be pleased to contribute to
ffmpeg wiki.
I don't know how to do it.
Can you help me please ?
First you need an account and you must log in.
Then you go the the wiki page that you want to edi
Am 01.11.2021 um 19:58 schrieb Michael Koch:
Am 01.11.2021 um 16:21 schrieb LianCheng Tan:
Hi,
Beside using textfile (reload=1) in drawtext for dynamic text, is
there any other method to add dynamic texts onto the video stream?
You could use subtitles. It's described in the wiki:
Am 02.11.2021 um 00:09 schrieb LianCheng Tan:
Thank you Michael.
For subtitles, what if the content of .srt or .ass file is being updated at
every second. Will ffmpeg crash because the file is being ‘locked’ by another
process that is updating it?
I don't know if this works. I thought the te
Am 02.11.2021 um 18:38 schrieb PPRJ01:
Thank you Michael,
I tried to register a new account at https://trac.ffmpeg.org/register
There is an antispam check in this page. I don't know what to answer to the
first question about the project name.
I think it begins with "f" and has 6 characters
Am 02.11.2021 um 19:43 schrieb PPRJ01:
Thank you again Michael for your kindly help.
Now I have an account to edit existing Wiki pages.
My question is how can I add a new page with my contribution before linking it
to an existing page ?
I have never done that in the the FFmpeg wiki. In other
Am 11.12.2021 um 22:24 schrieb Cecil Westerhof via ffmpeg-user:
I gave a speech on zoom. It was recorded, but sadly together with
others. So I want to crop my part out of it. At the moment this works:
ffmpeg -y -i input.mp4 -filter:v "crop=480:360:80:180" output.mp4
Was just wondering if th
Am 15.12.2021 um 13:30 schrieb Bo Berglund:
I am using this script on Ubuntu 20.04.3 server which I wrote to paste together
clips from a video into one single video.
It takes the output video file as the first argument and all following are the
clip files. Script has error checking for user input
Am 15.12.2021 um 14:14 schrieb Bo Berglund:
On Wed, 15 Dec 2021 13:45:13 +0100, Michael Koch
wrote:
You could remove -c copy, but that makes the process much slower.
Are you sure that all input videos have the same properties? Same size,
video codec, framerate, audio codec, number of audio
Am 30.12.2021 um 07:09 schrieb Jim DeLaHunt:
On 2021-12-29 21:00, paul king wrote:
In the ffmpeg Documentation there is this command for Select the pass
number (1 or 2):
ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/n
Am 04.01.2022 um 03:19 schrieb Hanna Frangiyyeh:
Hi Guys;
I have a video file that has an embedded alpha in it. I would like to have
it output two files, one RGB and the other Alpha. Any idea how to
accomplish this?
Making the RGB video is easy, just convert the pixel format to RGB.
For extra
Am 04.01.2022 um 21:12 schrieb Hanna Frangiyyeh:
Hi Guys;
I'm new to ffmpeg and I'm trying to figure out what is wrong with the below
filter. It keep erroring out with the following error:
Unable to find a suitable output format for '[rgb_in][alpha_in][rgb_in]'
ffpmpeg -i "D:\TEMP\Source Files\
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