The Twitch video sharing website uses free software such as FFmpeg to transcode user video files. There is also a lot of other software such as Varnish Proxy, which is a web accelerator for content-heavy sites. But most of the power of Twitch is due to a CDN that helps deliver such a huge amount … Read more
Downloading video from a website can be very annoying if they use video blobs that are assembled into a full video file. But I have found one way of doing this. The example shown below has many individual files that are video blobs, these are assembled using a master.m3u8 file. This is a playlist for … Read more
To merge a Video file and an audio file, only FFmpeg is required. I needed the audio from one other video, I ripped it like this. ffmpeg -i Online-1.mp4 -vn -acodec copy output-audio.aacffmpeg -i Online-1.mp4 -vn -acodec copy output-audio.aac Then I could use this command to merge the aac audio with a silent video to … Read more
This script will encode a video file into a png image that may be shared on the Internet. This is very cool indeed, this allows a good-quality video to be shared in a relatively small image. #!/bin/env bash : ‘ usage: script.sh <input> <hres> <yres> <fps divisor> <aspect> <audio bitrate> [<output>] example: script.sh input.mkv … Read more
Recording a window with OBS is very easy, this allows easy streaming and recording of gameplay or a video window. The screenshot above shows an OBS studio window displaying a video window, you select the window by double-clicking the Window Capture (Xcomposite) 2 option. This brings up another dialogue to select any open window on … Read more
Making a slow-motion clip from a video can be very useful to show off what is happening in a certain scene. The example below will make a slow-motion clip from a video file. This would be another very useful FFmpeg tip. > ffmpeg -i qS_lu5dKo9A2qoNW.mp4 -c:v libvpx -b:v 3200k -filter:v "setpts=2.0*PTS" -ss 00:00:03 -t 6.9 … Read more
Making a video file brighter is very easy, this can be done with FFmpeg. The curves filter can easily brighten a video file without causing much degradation at all. Use this example to make a video file a bit brighter and it will still be the same quality. ffmpeg -i -i underground-war.mp4 -vf "curves=all=’0/0 0.4/1 … Read more
FFmpeg allows interesting video manipulation. This includes inverting the colours of video files. The example below will invert the colours of a video file. ┌──[[email protected]]─[~/Videos/titles] └──╼ ╼ $ ffmpeg -i zombiestrain.avi -vf lutrgb="r=negval:g=negval:b=negval" zomby.avi┌──[[email protected]]─[~/Videos/titles] └──╼ ╼ $ ffmpeg -i zombiestrain.avi -vf lutrgb="r=negval:g=negval:b=negval" zomby.avi This is an example of what this filter will give you. This … Read more
The Radio Shack TRS-80 computer shown here is the first computer I ever used. It has a massive 4K of RAM, upgradeable to 16K, a cassette tape drive using standard audio cassettes with programs on them such as games and utilities as well as a monochrome monitor and of course a very good keyboard. It … Read more
It is very easy with ffmpeg to remove a logo from a video. This is done with the delogo filter. Below is an example. Here I am using the delogo filter. This is the x and y locations of the logo and the width and height: “delogo=x=483:y=25:w=298:h=77”. ┌─[jason@jason-desktop]─[~/Videos] └──╼ $ffmpeg -i input.mp4 -vf "delogo=x=483:y=25:w=298:h=77" -c:a … Read more
Downloading a video blob from a website can be very frustrating. This is easier with the Download Helper extension for Firefox. This can make this task very easy. When you are on a website that hasthe video you want, click the Download Helper icon and find the format and resolution you wish to download. Then … Read more
Tik Tok is a very useful website for sharing short-form videos online. But you cannot easily download videos unless you know how to. But there is a very useful trick to do this using Firefox. Just open a video then right-click on the video and then choose Inspect Element. Then look for this certain section … Read more
Getting information about a video file on Linux with the command line is very easy. I will show how you can easily find the resolution of a video and the format. This example below will return the resolution of a video file. jason@jason-desktop:~/Videos$ ffprobe XR_3DA_2019_03_16_19_22_35_777.avi 2>&1 | grep -E ‘[[:digit:]]{3,}x[[:digit:]]{3,}’ | awk ‘{print $11}’ 1920x1080jason@jason-desktop:~/Videos$ … Read more
There is a very nice trick you can do with MPV on Linux. This is playing 3 videos at once. In the above image, I am playing 3 videos at once with mpv on Linux. This is very easy to do and a lot of fun. This is how to do it. Have one initial … Read more
Overlaying two other video files on to another is very easy with ffmpeg. I had two video files that are 640×360 pixels, and one that is 1920×1080. I used this command line with ffmpeg to overlay them. ffmpeg -i controller_agroprom.mp4 -vf "movie=dbz120.mp4 [a]; movie=dbz121.mp4 [b]; [in][a] overlay=0:32 [c]; [c][b] overlay=0:448" out99.mp4ffmpeg -i controller_agroprom.mp4 -vf "movie=dbz120.mp4 … Read more
The mpv media player can scale the output, just as mplayer does. This can be useful. Use this parameter to scale the video. -vf scale=960:720-vf scale=960:720 This is how this is done. This will scale the output to 960×720 pixels. 4.4 Mon Jul 08 jason@Yog-Sothoth 0: $ mpv -vf scale=960:720 olr_2_5_controller.mp44.4 Mon Jul 08 jason@Yog-Sothoth … Read more
Playing a Youtube video with mpv is very easy, it is also possible to skip to a certain part of the video whenever you wish. Make sure that you have the latest version of Youtube-dl first. sudo curl -L https://yt-dl.org/downloads/latest/youtube-dl -o /usr/bin/youtube-dlsudo curl -L https://yt-dl.org/downloads/latest/youtube-dl -o /usr/bin/youtube-dl Then run this command, and it should work … Read more
Cropping a section of a video and saving it without reencoding is very simple, the example below shows how to use ffmpeg to cut out a section of video and then save it to a separate file. This example will cut out a clip starting 12 minutes into the video and 13 minutes long. 4.4 … Read more
Use the Linux command line to query a movie file for metadata with this very useful utility. This gives the user a lot of very useful information about a file. Install this useful utility. 4.4 Mon Dec 10 jason@Yog-Sothoth 0: $ sudo apt-get install mediainfo4.4 Mon Dec 10 jason@Yog-Sothoth 0: $ sudo apt-get install mediainfo … Read more
This command will display an image in your terminal. Very useful for viewing images without using an external image viewer. mpv –no-config –pause –vo=tct https://stallman.org/rms.jpgmpv –no-config –pause –vo=tct https://stallman.org/rms.jpg Play a movie in your terminal window with mpv. 4.4 Thu Nov 29 jason@Yog-Sothoth 0: $ mpv –no-config –vo=tct fc4.mp44.4 Thu Nov 29 jason@Yog-Sothoth 0: $ … Read more