Questions tagged [filter]
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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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19
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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 ...
- 143
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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?
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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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100
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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 ...
- 115
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10
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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-(...
- 115
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127
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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 ...
- 101
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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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68
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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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89
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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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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 ...
- 101
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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 ...
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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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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 ...
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15
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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 - ...
- 111
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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 ...
- 101
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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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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 ...
-1
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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.
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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 ...
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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]...
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186
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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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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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241
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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 -...
- 111
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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--...
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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:
...
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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 ...
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1
answer
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/...
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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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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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3
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2k
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Replace all completely black frames with interpolated frames
Due to a bug with Nvidia Shadowplay, I have a bunch of videos that look like this. A bunch of random frames have been replaced with pure black frames.
I'd like to fix one of these videos to remove ...
1
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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 ...
- 145
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1k
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ffmpeg - get green overlay instead of red when using multiply?
multiply should result in a darker image according to this website. However every multiply options with input that I'm using resulted in darker green videos instead of layering it with colour that I ...
- 115
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2
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1k
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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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2
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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 ...
- 111
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424
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How drop still frames with timestamp ffmpeg
I have a ffmpeg command that allows me to drop duplicate frames and speed up the video and works well. I use it with hundreds of video recordings from a surveillance ip camera that does not have ...
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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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215
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How to lower number of parameters passed to ffmpeg
I am processing video with FFmpeg. I am trying to add image overlays at certain times. I have command something like this:
ffmpeg -i video.mp4 -i img_a.png -i img_xx.png -i some_third_image.png -i ...
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290
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FFmpeg afade produces horrible audio quality
I'm trying to add a video and audio fade in and fade out to my video using the fade and afade filters. I'm using the following command:
ffmpeg -i trimmed.mp4 -vf 'fade=in:0:60,fade=out:2940:300' -af '...
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3k
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What's wrong with VLC seeking and/or MKV created by ffmpeg?
I have creeated a video using FFmpeg. It is a result of putting 4 videos together, tiled, using -filter_complex with overlays.
Following the how-to here, I have it created as MKV.
When playing this ...
- 209
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13
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What do I need to take into consideration to take video of molten glass which I will later postprocess?
I want to take video of one part of the of production process of glass pressing: gob delivery. I want to assess the shape of the gob, dimensions, and position in the mold.
I do not know much about ...
0
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1
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635
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Color leakage effects with ffmpeg blend=all_expr
I generate two test videos (the first a test pattern, the second solid red) with
ffmpeg -f lavfi -i testsrc=duration=5:size=1280x720:rate=30 pattern.mp4
ffmpeg -f lavfi -i color=c=red@0.2:duration=5:...
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