Questions tagged [filter]
The filter tag has no usage guidance.
115
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Project: Use smartphone as webcam, add AR-filters to videostream, send output as feed to smartphone for further usage within mobile app
If the title is leaving you with a big "!!?!" then... my bad... I am lacking the needed vocabulary I guess. lol PLUS... I don't know if what I am trying is even feasible.
Here's what I want:
...
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2
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314
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How to apply different filters to different parts of a video using AviSynth?
I have a video file and want to post process it using AviSynth. Different parts of the movie require different filters to be used (noise reduction etc.). How can one use different filters for ...
CommunityBot
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Problems correcting perspective in video using FFmpeg
If I save a frame as a JPG using something like:
ffmpeg -i /dev/video0 -frames:0 1 check.jpg
I can get the coordinates to create an image with the perspective corrected using:
ffmpeg -i check.jpg -...
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FFmpeg dnn_processing with tensorflow backend: difficulties applying a dnn filter on an image
I am trying to perform a video segmentation for background blurring similar to Google Meet or Zoom using FFmpeg, and I'm not very familiar with it.
Google's MediaPipe model is available as a ...
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30
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FFmpeg select filter does not return frames
I observed a strange behavior while using the select filter. In short, I'm using ffmpeg to detect frozen sections in a video, calculate the exact middle point of these sections, then using filters to ...
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72
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How to adjust video histogram using ffmpeg?
I have a dark video and'd like to adjust its histogram. In a graphical editor I've found the values of the color levels that enhance video contrast.
How to set this level values in ffmpeg?
CommunityBot
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661
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ffmpeg 4.2.3 freezes in encoding which is extremely slow
I tried to encode some video files, from GOPRO action camera. The whole fuzz is about two specific video files that the video orientation is 180 degree. Therefore, I thought to implement complex ...
CommunityBot
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755
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ffmpeg to combine video + alpha video, transparency key with threshold
I have two corresponding video files. One is a regular video and the other is meant to be the alpha channel for that video. I wish to combine them, and use the alpha video to lay a transparency key ...
CommunityBot
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1
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49
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A video tool or ffmpeg filter to fix slightly shaky films from the 70s and 80s?
Lots of high-grossing older films including some that were released in the 90s have an almost imperceptible shake that is maybe due to the conversion from film to digital. You can only see it in ...
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How do I drawtext two subtitle files one after another in one command?
The following command overlays text on the video:
ffmpeg -hide_banner -i Loving_Caliber.mp4 -vf drawtext="textfile=subs1.txt:fontsize=75" output.mp4
where subs1.txt is a textfile containing ...
- 115
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76
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Is it doable to use a text file with a list of files as input when concatenating and reencoding with ffmpeg and -filter_complex?
When trying to concatenate mp4 files with the following script
#!/usr/bin/bash
echo "The number of files to be concatenated?"
read no
ffmpeg -loglevel warning -hide_banner -i ...
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How do I control the time of the movie= parameter when overlaying video with video?
The following command overlays main.mp4 with talkingHead.mp4.
ffmpeg -hide_banner -i main.mp4 -vf "movie=talkingHead.mp4, scale=400:-1 [inner]; [in][inner] overlay=main_w-(overlay_w+10): main_h-(...
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Removing / Overlaying logo on mp4 video format with ffmpeg on linux
I'm trying to remove a logo from an .MP4 video format with ffmpeg on a Linux machine without re-encoding (for preserving the same quality) with the following command:
ffmpeg -i input.mp4 -vf delogo=x=...
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106
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Video player with motion blur or frame averaging
I here would be a good place to ask, I apologize if Im mistaken.
I am looking for a video player that can add motion blur to videos or that can insert an average frame in between two frames.
The ...
CommunityBot
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1
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3k
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Add semi-transparent box around subtitle
Hey guys how can I add box around subtitle like on picture with ffmpeg
here is mi current command
ffmpeg -i movie.mkv -strict -2 -vf "subtitles=subtitle.srt:force_style='FontName=ubuntu,fontsize=30',...
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Applying dynamic mask across all images to make uniform with baseline
I do time lapses. In the attached image, notice each image has slightly different shades but are otherwise consistent. This is an artifact of a mechanical shutter.
I'd like to take a single pixel in ...
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1
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202
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Cryptic FFmpeg + Python error: "Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_crop_1"
I want to use ffmpeg with Python in a Jupyter notebook to create a video from 2000 PNG image files generated by matplotlib. I'm on a Windows 7 machine.
The frames are very narrow and high, so I'd like ...
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452
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Best deinterlacing filter for FFMPEG (no GPU)
I am hoping you can help. I am trying to extract frames (1 per second) from various videos and from various sources. However, I am getting blur/deinterlacing (see below). I've tried with various types ...
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183
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Command for dithering video using FFMPEG?
Noob here. I'd like to use FFMPEG to dither a video file. I'm unable to find how to put together a command and where and how to use it.
I really like the look of ezgif.com gifs, which I believe use &...
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FFmpeg - Is it possible to invert blackdetect filter's results to extract timecodes start/end of "segments" between blacks?
I'm researching to automate some process on rushes video files.
The timeline is black > sequence > black > sequence... I would like to extract the timecodes start/end of each sequence and ...
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can I change ffmpeg crop position at runtime for each frame during stream
I am trying to move an Region of Interest (RoI) around a multi-camera tiled source (which will be too big to encode for smooth viewing), and stream this "live". The RoI is externally ...
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How can I remove unwanted object from a video and see what's behind it?
If for example I have a video and there is a person that moves but is always partially blocked by an object, can I remove it somehow to get a clear video footage? I tried Adobe content aware Filter, ...
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1
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162
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Can I crop and overlay at same time when useing ffmpeg?
I have two command:
ffmpeg -i in.mp4 -vf crop='1280:720:0:0' -acodec copy croped.mp4
ffmpeg -loop 1 -i 1.jpg -i croped.mp4 -filter_complex 'overlay=(W-w)/2:(H-h)/2:shortest=1,format=yuv420p' -c:a ...
CommunityBot
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65
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Trying to identify specific VHS filters used here
A slightly blurry VHS filter:
And a screenshot from a puppetcombo game called murderhouse. They seem to have blue-yellow accents and are slightly blurry.
Thanks
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492
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Which FFmpeg variable gives the total duration of a video?
I've spent hours searching the documentation and forums for a simple variable and it's driving me crazy. Can anyone tell me what the variable is that gives the total duration of a video, so that I can ...
- 1,414
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30
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Searching an Adjustable Distortion ' filter ' for video
Playing a 720p movie file by VLC-mediaplayer (working normally with all other videofiles), gave a peculiar distortion, intermittently showing rather interesting visually pleasing patternings. Tried ...
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140
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ffmpeg volumedetect filter doesn't work on 32bit float audio?
Here is a test file with peaks at +200 dBFS (it's an extreme example, but the same holds for a file with peaks a +1 dBFS).
When running the "volumedetect" filter on this file, ffmpeg appears ...
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119
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FFmpeg - Loss of video quality when using vf setpts
I created a screen recorder for iOS using FFmpeg. I concat the images into a video which is fine and the quality doesn't change much from the screenshots but when I use setpts to match the video to ...
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Too many arguments in ffmpeg, concat, filter_complex command, what I am doing wrong?
I am using the following ffmpeg command with filter_complex:
ffmpeg -i GOPR0013.MP4 -i GOPR0013.MP4 -filter_complex "[0:v:0]fps=32,scale=1920:1080[v1],[v1]vflip[vF1],[vF1]hflip[clip1], [clip1] [1:v:0]...
CommunityBot
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2
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192
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Remove deadair periods in video
I am doing a video recording for a powerpoint presentation, and sometimes I have some seconds of (idleness) during the recording (where there is no change in the presentation nor speaking audio). For ...
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4
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Looking to intentionally distort video
I am looking to intentionally distort a video file. Filters and effects are not really doing it for me, they are simply too generic or predictable over the course of a 2-3 minute video. I am looking ...
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2
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425
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ffmpeg - Make a white line look thicker
I've been actively playing around with ffmpeg for the past few days, and now I want to make an audio visualiser, just with the showwaves filter (I made it white using p2p mode, and I don't want to use ...
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FFMPEG: Why does the concat filter cause loss of a/v sync/lipsync?
I am doing some tests with the FFMPEG concat filter (DASH experiments), and am seeing that I start losing lipsync after a few concatenations.
Is it expected that one can concatenate independent MP4-...
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1
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803
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Combining two video fields into one (to create an interlaced video)
I have two separate video fields (top.avi and bottom.avi) and I would like to merge them to create an interlaced video.
Is it possible to do this with ffmpeg? (or any other tool for Windows or Linux)
...
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0
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693
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Sampling and using afftdn with ffmpeg - how with complex filters?
I'm merging together a bunch of videos (30 so far) into a "Brady Bunch" style amalgam using ffmpeg, and I've got that working reasonably well. The last big problem is the background noise. ...
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Is it true that pixelization can be reversed given enough frames?
I just read someone stating the following on a Kdenlive bug report:
I'd much rather have a single color than pixelization, since with
enough frames, pixelization can be reversed.
Simple question - ...
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233
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Converting/filtering/deinterlacing VHS captures on Linux
I'm pretty much a novice video editor especially on Linux. I'm looking to take a bunch of old home videos I captured using ffmpeg and clean them up as painlessly/automatically as possible. At this ...
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5
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Fastest way to add a timestamp to a video
Is there any script or application that would add a timestamp to a video (avi or mov)?
Does for example mencoder support this function ? I'm using it to join avi files together.
I would be happy for ...
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Is there a high-pass filter for videos in Adobe Premiere Pro?
What I want to do is putting in high-pass filter effect on each image constituting a video by using Adobe Premiere Pro 13.1.2.
Premiere Pro has a high-pass filter for audios but it does not have a ...
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217
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How to perform a "lighten only" operation in ffmpeg for prop flicker removal
I have footage shot from a helicopter and I would like to remove the rotor blades. Since the blades are so fast it seems feasible to use the pixel values from the next frame (usually the sky) wherever ...
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2
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282
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Can I increase the scrolling speed of the showspectrum ffmpeg filter? [closed]
The way it is the spectrogram doesn't even reach through my screen after two minutes of playback. I want 30 seconds at most.
CommunityBot
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1
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How to deinterlacing with ffmpeg?
I have the following VOB file:
→ ffmpeg -i input.vob output:
ffmpeg version N-77455-g4707497 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
...
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776
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Changing FPS from 29.97 to 30 in ffpmeg creates short blank at end of video, audio is fine
I am trying to merge 5 parts of a continuous video using ffmpeg.
For some reason, the 1st part is encoded at 29.97 FPS, while all the others are at 30 FPS.
part #1 : 29.97 fps, 29.97 tbr, 19200 tbn, ...
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How to overlay 2 videos using depth layers
I'm trying to overlay 2 videos which both have depth layers (e.g. how far a pixel is away from the camera) using ffmpeg filters. (I have a few hundred of those videos so I'd like to do batch job out ...
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1
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480
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FFMPEG - Scroll filter on filter_complex applies on under layer
I apply filter_complex to put objects on coordinates using overlay. Sometime, I need to use the scroll filter.
Here is the code
ffmpeg -vsync 0 -i /tmp/2SN92agDIG.png -i /tmp/TogmpB9etD.png -i /tmp/...
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369
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blend filter and color
Trying to debug blending images over video led to this observation:
ffmpeg -i https://lh3.googleusercontent.com/vt1VzlKCpjJjxRGBd3oAVgOHau22m2257fDBaW3KfHsNbhOcw1--...
- 2,405
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599
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ffmpeg dynamic filter values from piped input
I need to run an audio filter on a piped input using its own lufs value as a variable, without writing to disk.
I previously bounced the piped input to processedaudio.wav and the command works as:
...
CommunityBot
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1k
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ffmpeg blend mode multiply results in green overlay
i'm trying to overlap two video clips using FFMpeg. I'm using the following command:
ffmpeg -i a.mp4 -i b.mp4 -filter_complex "blend=all_mode='multiply'" c.mp4
I was expecting to get something like ...
- 21
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1
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2k
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Combine -vf yadif,format=yuv420p and -filter_complex for watermark
I have an ffmpeg command using -vf to deinterlace videos and produce pixel format with 4:2:0 chroma subsampling:
ffmpeg -i input.mp4 -vf yadif,format=yuv420p \
-force_key_frames expr:gte(t\,n_forced/...
- 31.7k
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1
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30
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Fixing flickring old video
I have a bunch video that looks like it's flickering. The video started as Super8 (70s), was converted to VHS some years ago (90s?), and was recently converted to AVI. It looks something like this
...
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