Questions tagged [video]

related or about the video issues, the range varies from playing a video file, the formats, tools to work with it in *nix operatin systems up to issues surrounding it in specific environment (ie. console, framebuffer, X11 ...)

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31 views

Mysterious problem on setting up Reverse Prime (NVIDIA Optimus offloading through OutputSink) for an HDMI external monitor

I just recently decided to try Prime (NVIDIA offloading applications to its gpu, while system using integrated gpu, in my case Intel HD630) on my Slackware-current laptop, and soon I discovered that I ...
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To have a web host link to which a video file can be opened and played at once

How do we a have web link to a web host of which we have account, if we click that link it will automatically bring us to the web host site and playing a video of 70-110MB MP4 file size ?
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21 views

efficient way to compose all frames in a video to a single image

I've got a 720p video file that is about 20 minutes long. I want to compose each frame in the video using a single operator (e.g. lighten, darken, etc.) to produce a single image output. My thought ...
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v4l2sink does not appear in OBS

I'd like to send OBS audio input and video to Zoom. I followed this tutorial closely and got everything working. However, I still don't see v4l2sink in OBS under Tools. Similarly, I can now select a ...
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Record speech time in video conferences?

We all use a lot of Zoom, Skype, Meet these days. I tend to talk more than I want to when in online meetings, so I was wondering if anyone has ideas on how to quantify how much I actually talk during ...
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43 views

Is It Possible To Track GPU Performance Increase?

CentOS7 I'm about to upgrade my gpu. Before I take action I am curious if there are any tests I can run on the cli that will track the performance of my current gpu so I can compare to the new gpu? ...
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16 views

Capturing all frames with VLC scene-filter

I'm attempting to use VLC's scene-filter to extract all frames from an mp4 video. The video in question runs at 25fps, and is precisely 38s long. In the command line, I ran with options: --video-...
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20 views

nginx erratic error “111: Connection refused while serving video file”

I have this server, a debian 10 arm64 machine on which I host an asp core 3.1 video streaming website. Overall it is working just fine except that sometimes when playing a video, for some reason nginx ...
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1answer
24 views

How to use on-board graphics and graphics adapter card simultaneously?

I have an ASUS TUF B460 mobo with an i7 10400K CPU. I also have an EVGA GeForce GT 710. I have two HP ZR30w monitors capable of 2560x1600 each. I am not a gamer, I just want both monitors to be active,...
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How can i give a video out as web camera device? [duplicate]

Some apps need a webcam and i would like to feed them a dummy "device" which is just a video on loop. How can one do this?
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Suppressing error message “uvcvideo: Failed to query (GET_CUR) UVC control”

The tech support of the USB camera we use, Intel Realsense, says the error message in subject is benign (github.com/IntelRealSense/librealsense#7099). But as I started a conversation on the same forum ...
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ROS Camera Calibration GStreamer Error

I have a VM with ROS Noetic installed and I want to run a camera calibration on my USB Webcam. I followed the following guide and for the launcher, I put the following code: <launch> <!-- ...
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Custom resolution does not work in vega

Im trying to make customs resolutions based on the xrandr, but when trying the relutions via the display utility, it gets a black screen only. I dont know if this could be a issue of the driver or the ...
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27 views

Can't access IR video stream on mini camera

I bought a "IR capable" camera (https://er-estavel.com/product/1080p-hd-mini-kamera) but I can't get the IR part to work on Linux (current Archlinux). v4l2-ctl --list-devices gets me: ...
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How can I reencode a video's audio when it was recorded in stereo with a mono source?

I have a video that I recorded with an interface using an XLR microphone (mono). The video recording software (Simple Screen Recorder), and my PulseAudio all saw that as a stereo source. Now I have a ...
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25 views

What libs does gThumb need to play audio and video files?

I've installed APT version of gThumb and have found out that it fails to play audio and video files (with the Audio/Video support extension enabled). Several days ago, when I had a lot of apps ...
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28 views

Capture VGA Port

I have implemented an FPGA program in Verilog which outputs a video signal over an VGA port. When I hook it up to a monitor via VGA it works great and the image is displayed on the screen. I am now ...
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What causes a bad quality image in VLC?

The video in VLC has like blurry horizontal lines that are mostly visible with writings. This doesn't affect the subtitles, only the video. I tested the same video with VLC (left) and the default ...
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28 views

How do I make omxplayer playing /dev/video0 on Raspberry Pi

I am using the following script to play an HDMI video capture input connected to one of the USB ports of Pi: #!/bin/bash rm /tmp/vbuf mkfifo /tmp/vbuf ffmpeg -loglevel -8 -y -f v4l2 -input_format ...
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42 views

How to convert/understand video files with ffmpeg

background I have a bunch of video files that I would like to play on my roku through it's "Roku Media Player." However many of them simply do not appear in the list of available videos on ...
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2answers
194 views

Getting MP4 to play in Firefox in OpenSuse

I'm not sure since when, but MP4 videos are not playable anymore on Firefox. There's an error message in the Web-Console saying HTTP-Content-Type "video/mp4" is not supported. OS: OpenSuse ...
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4 views

One screen, two touch panels (half + half) - configuring driver(s) / calibrating

For complex and tedious reasons I'm looking at a project where a single-screen HDMI video output is split to two monitors 50/50 left/right, each of which has a touchscreen overlay. Left half of screen ...
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Getting snow in fullscreen video in Google Chrome

I have Arch Linux running on a Gigabit Z370 HD3P motherboard and i3 CPU with no graphics card (uses onboard video). I have started getting bands of snow when I run fullscreen video only. If I pause ...
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75 views

How to get data from VLC player

I need a command or a python code to get all data like the name of the file which is playing in VLC and hour:minute:second of the video. Sample Output: pc@system: $ TheCommandLine File : /home/rev/...
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Weird display behaviour when trying to watch fullscreen video after enabling fractional scaling?

I installed Pop!_OS 20.10 yesterday and going through some configuration options, I enabled fractional scaling and set it to 125% which works perfect for me. Afterwards, I was going to watch a video ...
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74 views

v4l2-ctl colorspace and transfer function syntax

I try to set the colorspace and transfer function parameters for my webcam in v4l2-ctl but the program just prints out the help for v4l2-ctl --help-vidcap. (see transcript below) I think I have the ...
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10 views

Transferring additional data via gstreamer

I'm building self-driving robot from scratch and in order to minimize cost and maximize battery life, I decided to stream video to my PC from camera installed on robot, using Raspberry Pi Zero W, and ...
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603 views

obs Studio can't sart due to error: “Failed to initialize video. Your GPU may not be supported, or your graphics drivers may need to be updated.”

Today,I have to upload something, and for that I want to film he footage using obs-stuio (I use arch-linux 5.9.4) . But when running it, I encountered this problem: error: Failed to initialize video. ...
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14 views

gst effectv and noise reduction

I have a somewhat noisy usb camera and I'm using v4l2loopback and ffmpeg to duplicate /dev/video0 ffmpeg -f video4linux2 -i /dev/video0 -codec copy -f v4l2 /dev/video3 -codec copy -f v4l2 /dev/video4 ...
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183 views

Debian 10.6 boots to black screen; “no screens found(EE) in log”

I have installed Debian 10.6 "Buster" on a 2019 5k iMac, but the system boots to a black screen with a flashing cursor in the upper-left corner. I can still get to a console, however. In ...
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1answer
35 views

Arch Linux: distortions during fast changes on screen (vsync)

I am using Arch linux with i3wm on my Lenovo x390 yoga notebook. I am experiencing weird glitch during fast changes on screen (videos, games, cursor movement). The glitch are horizontal lines dividing ...
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120 views

ffmpeg v4l2 driver changes framerate of Logitech c920 camera

I own a Logitech c920 camera which seems to be able to do at least 24fps for 1080p (although the specs say it should go up to 60), according to vlc -vvv --color v4l2:///dev/video0 --run-time 1 vlc://...
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1answer
46 views

Lossless ffmpeg recordings with low resource usage

I'm trying to record lossless videos with ffmpeg of My screen My computer audio My microphone audio using this script: MIC="alsa_input.usb-Logitech_Logitech_USB_Headset-00.mono-fallback" ...
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1answer
749 views

How to enable HW acceleration in Celluloid video player in Linux Mint 20?

I have this graphics card in my Dell laptop: GPU: NVIDIA, GeForce GTX 1060, Max-Q Design, 6 GB GDDR5/X VRAM which has the basic specification as follows, and should be capable of handling hardware ...
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41 views

Can't play some videos

I have 3 video players installed (Gnome Videos, VLC and MPV) on my computer (Pop_OS 20.04): and they fail to play some of my old (AVI) videos. Trying to play the same video with all players gives ...
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45 views

video4linux not working in new kernel (new kernel is not creating /dev/video0)

I am using an HDMI to USB capture device that linux sets up as /dev/video0. It works like a webcam, but captures from HDMI. It works perfect using the vmlinuz-5.0.0-32-generic kernel. After ...
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126 views

ffmpeg batch command to reduce file quality

I've got a directory with thousands of images (png, jpg, bmp, etc.) and thousands of videos (mp4, mpv, mpeg, etc.). The png images may be ~10 MB and I can open them one at a time in GIMP, reduce ...
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1answer
190 views

Why are USB C -> DisplayPort adapters mix-and-match for every laptop?

I have a Lenovo Legion Y520 15IKBN (the specs of the Y520 are here, I have the one with a Nvidia 1050 Ti), and I have just bought a VR Headset Oculus Rift S which has a DisplayPort connection. I had ...
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25 views

download part of video up to certain resolution

This command will download part of the video youtube-dl -g "https://www.youtube.com/watch?v=mFlrc16xjik" | awk '{ if(NR==1) print $0 }' | sed "s/^/'/;s/$/'/" | xargs -I {} ffmpeg -...
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65 views

How to sync different fps video inputs

I want to do something similar to the one on this guide but in that case both inputs have the same fps, I want to sync two distinct framerate inputs, here a sample: ffmpeg \ -f x11grab \ -...
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1answer
56 views

Why are my colors separated/shifted when using obs/v4l2sink/v4l2loopback?

Im using OBS with v4l2sink and v4l2loopback to edit my video for a remote trainig. The preview in obs looks fine, but the video has some serious color shifts in any tool I try to display the ...
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9 views

Recordings come out glitchy

I usually record my computer screen to give tech support or share something, however I found that my recordings have been coming out super glitchy. Windows cut diagonally revelaing the desktop even if ...
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24 views

How to project Linux desktop to Microsoft Teams meeting?

I need to show my desktop during a Microsoft Teams meeting, to demonstrate some software on it, live and not prerecorded. Is there some way I can pipe my Linux desktop screen and audio out to a ...
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3answers
2k views

How can you download 4k youtube videos in mp4 using youtube-dl?

I have observed that the size of mp4 videos are larger than webm for a same resolution video. Which makes me wonder that either there is some quality loss or compression in webm. youtube-dl -F url ...
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87 views

Why does specifying audio input before webcam video input in FFmpeg cause them to go out of sync?

I am using FFmpeg to stream from a webcam and a pulseaudio source to an RTMP server. I know that argument order has an effect in FFmpeg. But I have found that if I specify the audio input stream ...
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1answer
17 views

Is there a way to “verify” the performance of a video chip/driver from the command line?

Is there a way to "verify" (or compare) the performance of a video chip/driver from the linux/unix command line? Thanks! :) Asher
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20 views

How to verify if video drivers (already exist in the kernel) for a particular card on Linux?

Is there a way to verify if video drivers exist in the kernel for a particular card on Linux from the command line? Is there any way to search for the device drivers (that are already included) ...
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1answer
43 views

LibreOffice distorts embedded videos

I'm using LibreOffice Impress on Arch Linux to make a presentation. When I embed a video into my presentation, the video initially plays fine, but gets distorted after a few seconds. The distortion ...
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2answers
65 views

Record screen and upload on youtube

I'd like to record my screen and have the recorded video automatically uploaded on youtube. Is there any software that does this? I know there are screen recorders like Kazam that easily permit to ...
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1answer
64 views

PulseAudio-alsa and X-server Issue Synchronization

I use PulseAudio-Alsa (Arch x86_64, 5.7). Today I noticed a very weird issue and found 0 relevant issues online. It's really not too big of an issue, more than I'm blown away at the fact of what is ...

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