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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16 views

How to increase the duration of the transition effect between multiple video cuts in this ffmpeg `-filter_complex` command

As instructed in Gyan's solution to this question, ffmpeg can be used to interleave two audio/video inputs with a lapse dissolve transition. For example, this command will divide each input into cut ...
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1answer
27 views

Trans-coding hevc / x265 video file using VLC and viewing it on a chromecast

I've been successful at getting VLC to stream a x264 encoded file from a network file share to an old chromecast (which mine doesn't support hevc / x265 directly) using the commands below. vlc -vv --...
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21 views

ffmpeg vaapi encode causes black bar on the right side

I'm trying to transcode an 854x480 h264 mp4 video to an h265 mp4 video using vaapi. The video does come out nice looking, And encodes very quickly. But there is a black bar on the right side of the ...
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28 views

Query the target device for installed PCI devices on ubuntu

Is there a way to query the target device for installed PCI devices on ubuntu. I use VideoCapture Card and 8 cameras. Every time /dev/video* changes but I would like to assign a camera to specific /...
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56 views

How to significantly lower a video file size with ffmpeg without quality loss?

I see there are videos on youtube with 1080p resolution that are more than 10 minutes long and only 50-60 mb in size. I have a video only 3 minutes long and only 720p resolution but unable to bring ...
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13 views

How to record the lock screen and other users sessions?

After I log in to my Linux session I start recording my screen with the command recordmydesktop --fps 2 --no-sound --on-the-fly-encoding --compress-cache --no-frame --v_quality 10 But when I to go ...
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94 views

Script for ffmpeg webcam audio video recording

I've bought the very popular Logitech C920 for creating YouTube videos with ffmpeg. My desire is to build a script for easy recording without bothering with the powerful but rather cryptic ffmpeg ...
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9 views

How to add still images to audios to make a video by FFMPEG?

I have several audio files, and need to add different still images to them. Currently, I make a video of each audio file with the corresponding still image as ffmpeg -loop 1 -framerate 1 -i photo1....
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17 views

Which format my webcam produces

How can i find out which format (preffix) my USB webcam produces ? I want recording webcam to HDD with ffmpeg and i need save the capture record without reencoding because of CPU usage (i using ...
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1answer
68 views

GParted live graphical mode not working

I want to run GParted live 1.0.0.3 on a laptop with both an integrated and discrete graphic card. I managed to start GParted using the "vga=normal" boot option, but X refuses to start either if select ...
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1answer
53 views

How to add an still image while combining multiple audio files in FFMPEG

I combine multiple audio files with FFMPEG as ffmpeg -i 1.mp3 -i 2.mp3 -i 3.mp3 \ -filter_complex '[0:0][1:0][2:0]concat=n=3:v=0:a=1[out]' -map '[out]' out.mp4 Then, I add a still image to the ...
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What deteriorating component in my laptop is causing poor performance while playing videos

I have a laptop which I have been using for years. I was always able to watch Youtube videos and hours-long HD videos stored on my hard drive just fine. However, recently the device started poorly ...
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1answer
25 views

youtube-dl : how to skip downloads lower than 480p resolution?

When using the popular program youtube-dl, how can I skip download of certain videos, particularly ones that have a lower quality than 480p resolution?
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1answer
15 views

Random lines during screen recording playback

Every time I record or screencast my desktop, once I play it back I get random lines appearing now and then, no matter what media player I use. They're either black or they show fragments of my ...
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13 views

Batch set MP4 create date metadata from filename

On a Linux system, I have a bunch of MP4 files named like 20190228_155905.mp4 but with no metadata. I've previously had a similar problem with some jpg's which I solved manually with exiv2 -M"set ...
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74 views

Linux Mint 19 install and update problems

I'm using Linux Mint, how can I check which Graphics drivers are being used ? I want to enable the Intel Hd graphics drivers, whcih I think are already installed (how would I check?). How do I ...
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2answers
206 views

Chromium won't play any Youtube videos, Firefox plays them

I'm using Devuan Beowulf (~= Debian Buster), freshly installed. I can play Youtube.com videos fine using Firefox, but if I try them in Chromium, it keeps shown the loading animation (the circle with ...
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2answers
54 views

How do I use mpg123 to extract the audio from a .mov video to a .wav file?

I have some video files in .MOV format and I want to extract the audio from them to .WAV files. I cannot use MP3 files as I'm trying to feed the sound into a sonographic analysis program (WASP) that ...
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11 views

Play two webcam feeds on top of each other in fullscreen mode

I'm looking for a linux app which I can configure to play on launch the feed of two connected webcams. The feed of webcam 1 should be fullscreen, while the second one should play in a specified ...
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1answer
60 views

How do I reduze the size of a video to a target size?

I want to reduce the size of a video to be able to send it via email and such. I looked at this question where I got good advice on how to reduce it. Problem is that I need to manually calculate the ...
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1answer
787 views

H.264 videos fail in Firefox or Chromium on Fedora 30

https://www.youtube.com/html5 reports my browsers (Firefox 66.0.5-1.fc30 and Chromium 73.0.3683.86-2.fc30) on my Gigabyte GA-970A-UD3 with a Radeon RX-580 GPU don't support H.264. I've tried ...
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39 views

Best way to sync OMXPlayer audio and video?

I am having issues getting OMXPlayer video played on a TV via HDMI to sync with audio streamed over the network. My thought was delay the video output by ~500 ms then use pavucontrol to fine tune the ...
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24 views

External network display for playing media

On my Windows 10 computer I was able to right click a media file (video) and choose "Play To ..." and then select my Sony Tv which was plugged into the network. The video would then play with the ...
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1answer
161 views

Screen Tearing on Linux Mint Mate with Intel Graphics

I'm experiencing screen tearing with Lint Mint Mate 19.1. Running lspci | grep VGA prints 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated ...
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111 views

Why is VLC Media Player playing videos like this?

Please see the short GIF recorded screencast of the problem in action. This is how all videos open and play, I cannot see a darn thing, just these big colored bars where the color is taken from the ...
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2answers
62 views

How to list all files less than 1080p

There are a number of Youtube channels that I archive using a daily cron script that runs youtube-dl. However, in checking over the videos to make sure my script is working, I noticed for one of the ...
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75 views

restrict access to the webcam to certain user/software on Ubuntu 16

I would like to restrict the access to the webcam only to certain programs/users. I use Ubuntu 16.04. If I am right my webcam is linked with /dev/video0 (just as an example), which is owned by root ...
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406 views

Multiple /dev/video for one physical device

First some specs: my computer is an HP EliteBook 8460p. It comes with an integrated Chicony HP HD webcam. My issue is that a lot of applications (well, at least Skype and guvcview) are displaying ...
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43 views

Force stream order in ffmpeg (via mpv)

What is the preferred way to force ffmpeg (via mpv) to order the streams with video first and audio second? Wrong stream order can result in playback problems or certain sites rejecting the webm for ...
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15 views

Remote-control or video-stream a closed-computer-system with another computer (no VNC)?

I have two computers next to each other (A - test computer, B - recorder/remote client). I need to be able to either: remote control computer A from computer B, or record and project/stream video out ...
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1answer
136 views

How to embed current time with ffmpeg?

I'm using ffmpeg combined with tee and mplayer to have a simple video livestream and recorder over SSH. Now, I'd love to embed the current (server) time in the stream. The format doesn't matter much, ...
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1answer
73 views

Power off video card until reboot from command line?

I have "headless" machine with video card, I use very rarely, only if I want physical access to it. The cooler of this video card became old and started to produce bad noise. Can I disable this video ...
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206 views

ffmpeg black screen recording

When I record my desktop or recording video with ffmpeg it generates a black video. My operating system is Ubuntu 18:04 bionic kernel 4.16 Here is the command I'm using : ffmpeg -f x11grab -s ...
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1answer
271 views

error ffmpeg Cannot open display :0.0+0,0, error 1. :0.0+0,0: Input/output error

Hello I get this error when i want to capture my screen on linux with ffmpeg ubuntu 16:04 : the command i'am using : $ ffmpeg -f x11grab -r 15 -s 1920x1080 -i :0.0+0,0 -vcodec rawvideo -pix_fmt ...
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75 views

GStreamer: APNG, GIF or animated WebP

I want to generate an animated preview of a video using gstreamer for preview on a webpage. I'm able to get a static PNG with the pipeline filesrc location=... ! decodebin ! videoconvert ! pngenc ...
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51 views

How to modify blended video durations with a -filter_complex command argument in ffmpeg

Building off the solution provided in this thread, I'd like to know how to make simple modifications to a complex command argument which uses ffmpeg to interweave two videos by dissolving them into ...
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228 views

Evaluate the similarity between two video files

I'm looking for a method that reliably gives me a "mathematical distance" of two videos from one another. Similar to how the Levenshtein distance can be used to get the distance from a string to ...
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1answer
442 views

Download error with youtube-dl and axel

I am trying to download following video: https://www.youtube.com/watch?v=pQWj2Fgxdrc by combining 'youtube-dl' and 'axel'. I am trying to download this video in such a way that I want these two ...
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1answer
55 views

How to extract the “stored frames” without rely on fps?

I noticed if I extract frames with this command: ffmpeg -i sample_nosound.mp4 $filename%03d.jpg It will extract depends on fps by default. ffmpeg -i sample_nosound.mp4 shows this video has 6 fps, so ...
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1answer
360 views

How to find and delete duplicate video (.mp4) files? [closed]

I have 16,000+ short video clips and there are lots of them that are exactly alike to the human eye, but if you examine very closely you will find that one or the other may have an extra 1 second (or ...
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2answers
129 views

How to transition smoothly and repeatedly between two videos using command line tools?

I want to output a video using two videos as input, where these two videos fade (or dissolve) into each other in a smooth and repetitive manner, every second or so. I'm assuming a combination of ...
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0answers
15 views

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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21 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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31 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
74 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
6k 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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33 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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50 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 ...
3
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1answer
43 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
287 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 -...