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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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Suitable parameters for hours of screen capture

I need suitable parameters for very, very long screen captures using ffmpeg. Quality: Only occasionally needed. If text is readable, that's enough usually. I can use -qscale:v *[0-32]*, of which ...
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16 views

Create a video from pictures and audio for each picture

I have many slides (pictures) and spoken audio for each slide. Can I turn this into a video? How long each slide is shown is determined by the length of its audio. Can I somehow script this and ...
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9 views

Gstreamer - problem with mkv playback and jack

I use gst123 as my regular audio and video player. I'm now using a Saffire 6 USB interface, which works out of the box using jack so I select jack as audio-output device with the -a option like this: ...
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1answer
42 views

List files that are not H264 encoded

I want to convert any files in a large media collection that are not encoded with H264. In order to do that I need a tool to list all the files, I need to convert. There are a lot of files to go ...
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1answer
36 views

How to recover a broken mp4 file: moov atom not found

I made a recording with ffmpeg -f alsa -ac 2 -i plughw:0,0 /tmp/audio.mp4 I then moved /tmp/audio.mp4 to another directory (/root/audio.mp4) without stopping ffmpeg leading to a broken .mp4 file: ...
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10 views

CLI Tool to extract images from video slideshow

I'm looking for a tool that can take a video (mp4) that is composed of about 50 still images and extract all of the images out of that video. Is there anything like this that exists?
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28 views

Does X11 fix the frame rate?

Since I configured my Gentoo, my UID hasn't been added to the video group. And everything was just fine. But when I started doing some GUI programming(the library basically just using openGL for ...
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16 views

Split DVD iso of TV series into episodes

I have a lot of DVD isos (I also have the physical DVD's, but I have ripped them, so they shouldn't be needed for this), of various TV series. Each DVD contains several episodes of the series, but ...
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1answer
36 views

Find what program accessed a kernel module

How do I access a list of users/programs that accessed a certain module? I run: lsmod | grep ^uvcvideo This returns this line when no application is using my video camera: uvcvideo ...
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1answer
30 views

Connection refused to local ffserver

I am unable to send my desktop capture to a localhost ffserver: the connection to the local server is refused. # ffserver >/dev/null 2>&1 & # ffmpeg -video_size 1600x900 -framerate 20 -...
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1answer
25 views

Cannot send desktop capture to ffserver?

I am simply trying to send a ffmpeg stream consisting of a desktop capture to a local ffserver: # ffserver >/dev/null 2>&1 & # ffmpeg -video_size 1600x900 -framerate 25 -f x11grab -i :...
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30 views

Issues with Nvidia drivers [closed]

Something happened to my laptop during an update it seems and I have been experiencing MANY issues with apt-get and dpkg trying to update packages due to unmet dependencies. Everything I have found ...
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1answer
32 views

Udev rules for seemingly indistinguishable devices

I'm trying to use udev to automatically set up symlinks to an Intel RealSense D415. This is because I use several cameras on the machine and need to be able to reliably refer to them via a filename (...
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2answers
139 views

Is there any video player which can seek with thumbnail like in YouTube?

When you watch a video in YouTube, you can seek it with the thumbnail preview. Many Windows' and MacOS' video players have this feature, but what about Linux's? I've already read this same question, ...
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36 views

djv view: no sound while playing the video

I have installed DJV on Arch Linux. I installed it because I wanted to play a video forward and backwards frame by frame. So far so good. But I don't hear any audio. What might be the problem, and ...
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1answer
35 views

How do you take a video of a program running on a headless machine

I would like to take a video of what would run on the X Server on a remote machine and store that on my local machine. I thought of forwarding the X Session and using a screen capture tool, but ...
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43 views

How to drop bad frames in video file?

I've got a video footage from a security cam in MP4 format that from time to time contains broken frames. When I export the video to JPG frames the broken frames can be easily identified: Is there ...
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1answer
167 views

How to speed up video to make timelapse?

I've got a video file with 1.0 FPS (i.e. one frame per second) and would like to re-encode it so that it plays ca 20x faster. A short 1 FPS sample is here: http://s3.aws.nz/cam-1537668742.mp4 I can ...
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25 views

Partially replace video stream while preserving audio stream

Consider a video file with one video and one audio stream. I want to replace the video stream partially while preserving the original audio stream. With partially I mean to replace certain seconds ...
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0answers
72 views

trim video files via audio track information

Is there a way to pass a folder of .mp4 files and trim them by audio track? Say the first 20 seconds has no loud audio and the last 20 seconds has no loud audio, is there a way to remove the first and ...
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0answers
472 views

Codecs support disabled in Firefox

In Firefox 61, under Tumbleweed I cant play videos from youtube, when checking for the html5, it says: So I have been playing with the about:config and about:buildconfig but the mp4, h264, etc ...
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1answer
144 views

A fast question about GVT-g Intel?

I read this howto and have the following questions: Is this like the GPU passthrough VFIO (you need two monitors and two different graphic cards, and a motherboard which supports IOMMU feature)? Or ...
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2answers
338 views

FFMPEG: change input without stoping proccess

how i can change input on ffmpeg without stop process on linux Debian 9? im user decklink input and i need to change to file mp4 input. ffmpeg -f decklink -i 'DeckLink Mini Recorder' -vf setpts=PTS-...
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83 views

LightDM and nouveau issue

I have a PC desktop with Debian Stretch. Using kernel 4.9 it's working okay. But I want to use a newer kernel. I tried 4.15 4.16 and 4.17 and when I just PC and log in LightDM, i get to desktop for 1 ...
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187 views

gst-launch full screen

I've been using gstreamer on yocto project for playing video on HDMI, but I can't find anyway to play the video in full screen. Command I'm using is gst-launch playbin uri=file:///file/path How ...
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1answer
376 views

Arch screen freezing / pausing

My arch laptop has been freezing during video playback recently - not completely, but the video playback will freeze though audio will still play, and will unfreeze after input (moving the mouse or ...
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183 views

How to stream video on HDMI device using ffmpeg

I'm want to take mpegts from udp and out to hdmi using ffmpeg. Command I'm using is ffmpeg -hwaccel vaapi -i udp://<UDP_ADDR> -f alsa hdmi:0 This streams only audio on HDMI and not video. How ...
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1answer
32 views

Reset audio/video drivers and configurations to a fresh state

I recently moved my previous install of Linux Mint 18.1 from a Dell Inspiron to a newly bought Dell XPS 9360, connected to a Lenovo Thunderbolt 3 Dock, which hooks it to all my peripherals and an ...
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76 views

Set video to LVDS-1:d value in grub2 before booting

I need to set video to LVDS-1:d value in grub2 before booting. I may get to grub file by pressing e or to command line by c. I did many tries but not succeed. Don't now which place in the file, use ...
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1answer
3k views

Ubuntu 16.04 / 18.04 video playback lags / stutters

Since some weeks (I didn't use the video playback on this machine for quite a while), I experience lagging/stuttering while playing videos, regardless if it is in a browser or in Ubuntu videos, only ...
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1answer
164 views

How to force 60 Hz in 1366x768 despite kernel bug after kernel 4.13?

If your screen resolution is 1366x768 and your Intel card is able to go down to 40 Hz screen refresh rate for power saving (and most modern laptops can, no matter how cheap) instead of the usual 60 Hz,...
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2answers
32 views

Linux showing incorrect file modified time for camera video

I recorded a video with my camera and when I open the directory containing the video files, the modified time is always wrong. Here is a screenshot from the video clearly showing the correct time ...
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0answers
118 views

Debian Intel graphic drivers for nuc6i7kyk

I have installed Debian Stretch on a nuc6i7kyk, but I cannot get the video drivers to work (I keep getting UNCLAIMED drivers). Here as much info I can share on my install: $ glxinfo | grep -i ...
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1answer
1k views

Chromium not playing live youtube videos and other online streams

This is posted in order to provide an answer. Details about the initial problem are here. It involved not being able to play Youtube live streams, Tweeter live streams, Vimeo non-live streams and ...
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12 views

Screen glitching to desktop wallpaper when recording or screen sharing

I have a problem whenever I'm desktop streaming, or recording, on any software. OBS, discord (screen sharing ) ...etc the glitch is showing my desktop wallpaper for some reason or just a black color .....
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3answers
3k views

Cannot play live Youtube on other streams in Opera - no h264 support

I have good reasons to use Opera as my default browser (I find it lighter than Firefox Quantum and Chrome/Chromium, I like its speed-dial bookmarks, as well as other features and details). Opera ...
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0answers
292 views

Use guvcview to setup Logitech C920 webcam and keep configuration

I have a Logitech C920 webcam connected to my computer running Debian Linux. I want to access the stream by using mplayer (/dev/video0) and it works out of the box. However, the saturation/brightness/...
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0answers
221 views

play 4 rtsp streams in fullscreen

I have 4 IP cameras in my network, and I need to play the 4 streams at once in a grid view, currently i execute this command: ffplay rtsp://10.1.10.123 for each IP and then I rearrange the windows,...
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2answers
246 views

Turn off, not stand-by, console tty1 video

I want the opposite of what seemingly everybody else wants: on my plain old character mode tty1 console directly served by the video card of my bare metal Debian 8.10 Jessie box, I want the screen ...
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1answer
365 views

Udev Rule to discern 2 identical webcams on Linux

I have 2 identical webcams plugged into my Raspberry Pi. I want discern which camera is which based on the USB port they are plugged in to. This is the purpose of udev, so I wrote the following rule:...
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0answers
91 views

How do I set up a video loopback for recording my screen in X11 debian?

I am using LXDE on Debian Stretch and wish to record my screen using VLC media player. How do I set up the screen:// MRL capture device? Below is my attempt when assuming that I already had the ...
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0answers
100 views

Cannot turn on external display with xrandr

I'm running Linux on my Macbook Pro with i3 and I have been able to get everything working execpt my external monitor from the HDMI port. xrandr sees the monitor but the monitor still says "no signal" ...
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0answers
1k views

Unable to play the file mpeg-4 AAC decoder, H.264(Main Profile) decoder are required to play the file, but not installed

I recently installed fedora27, when I want to play videos this message pops up : Unable to play the file mpeg-4 AAC decoder, H.264(Main Profile) decoder are required to play the file, but not ...
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0answers
769 views

Very high CPU usage when playing web videos (Ubuntu 16.04.3)

I have just set up a new laptop - Dell XPS13 running Ubuntu 16.04.3 LTS. I've noticed very high CPU usage when watching web video. From a fresh boot, I start a single Firefox (or Chromium) window, ...
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0answers
118 views

video player which can step forward and backward frame by frame smoothly

I am looking for a video player which can allow me to step forward and backward frame by frame by using keyboard shortcut. I have video with 24fps. Presently i am using mpv. I am trying the ...
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0answers
72 views

Playing pdf with embedded animations

I have been trying to find a PDF viewer in Linux with the ability to play embedded animations (with the video data saved into the PDF). I have read tens of forum questions and tried many different ...
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0answers
41 views

CUDA on Linux - screen freezes

So I have Fedora 27 and I have installed the latest NVidia drivers on a laptop that has a Quadro M1000M. I am trying out an intense CUDA process (xmrig). But when it's running, the graphical screen ...
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1answer
214 views

H.264/MPEG-4 from PNG frames: how to, and how to tune compression

I often create digital animations by preparing all the frames in .png format (with minimal compression), that I need to convert to video format for upload to websites such as reddit, instagram, gfycat....
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1answer
111 views

Install mplayer or alternative player with GPU acceleration on ARMv8

I have a custom board that is similar to Odroid C2 i.e. it is powered by Amlogic S905 with a Mali 450 GPU. Support from Amlogic is limited, so I cannot turn to the manufacturer. I am running Arch ...
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1answer
419 views

Allow multiple programs to access the same V4L2 device

I'd like to be able to capture input from a webcam to to separate programs. One for VoIP, and one for capture. The problem is - Linux will allow only one process to access a V4L2 device, so once I ...