Video

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Revision as of 04:15, 10 January 2015 by Milk (talk | contribs) (→‎Projection)
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Codecs

  • H.264/MPEG-4 AVC is a block-oriented motion-compensation-based codec standard developed by the ITU-T Video Coding Experts Group (VCEG) together with the ISO/IEC JTC1 Moving Picture Experts Group (MPEG). The project partnership effort is known as the Joint Video Team (JVT). The ITU-T H.264 standard and the ISO/IEC MPEG-4 AVC standard (formally, ISO/IEC 14496-10 – MPEG-4 Part 10, Advanced Video Coding) are jointly maintained so that they have identical technical content. H.264 is perhaps best known as being one of the codec standards for Blu-ray Discs; all Blu-ray Disc players must be able to decode H.264. It is also widely used by streaming internet sources, such as videos from Vimeo, YouTube, and the iTunes Store, web software such as the Adobe Flash Player and Microsoft Silverlight, and also various HDTV broadcasts over terrestrial (ATSC, ISDB-T, DVB-T or DVB-T2), cable (DVB-C) and satellite (DVB-S and DVB-S2).
  • Daala is the code-name for a new video compression technology. The effort is a collaboration between Mozilla Foundation, Xiph.Org Foundation and other contributors. The goal of the project is to provide a free to implement, use and distribute digital media format and reference implementation with technical performance superior to h.265.



Tools

ffmpeg

ffmpeg -loop 1 -r 2 -i image.jpg -i audio.mp3 -c:v libx264 -preset medium -tune stillimage -crf 18 -c:a copy -shortest -pix_fmt yuv420p output.mkv

Transcoding

Info

Production

  • Video Production Stack Exchange is a question and answer site for engineers, producers, editors, and enthusiasts spanning the fields of video, and media creation.

Hardware

Software

Recording

  • mjpeg programs are a set of tools that can do recording of videos and playback, simple cut-and-paste editing and the MPEG compression of audio and video under Linux.

Screencasting

ffmpeg -f x11grab -r 25 -s 1024x768 -i :0.0 /tmp/output.mpg

avconv -f alsa -i pulse -f x11grab -r 30 -s 1280x800 -i :0.0 -vcodec libx264 -acodec libmp3lame myscreencast.avi

Techniques

Sharing

Mixing

VJing

  • LPMT is a little projection-mapping tool for use in our office, it is developed in C++ using OpenFrameworks. It’s based on simple quad warping paradigm, and, though rather simple, can be used to achieve complex and professional projection-mapping sets.
  • Open Sound Control (OSC) is a protocol for communication among computers, sound synthesizers, and other multimedia devices that is optimized for modern networking technology. Bringing the benefits of modern networking technology to the world of electronic musical instruments, OSC's advantages include interoperability, accuracy, flexibility, and enhanced organization and documentation.

Linux

  • v4l2loopback - a kernel module to create V4L2 loopback devices. this module allows you to create "virtual video devices". normal (v4l2) applications will read these devices as if they were ordinary video devices, but the video will not be read from e.g. a capture card but instead it is generated by another application. this allows you for instance to apply apply some nifty video effects on your Skype video... it also allows some more serious things (e.g. I've been using it to add streaming capabilities to an application by the means of hooking GStreamer into the loopback devices).
  • vDome is an application designed to calibrate multiple projectors on a hemispherical dome surface and display a domemaster formatted video, image, or interactive application. vDome is generally used in two ways: 1) as a media player and 2) as a background process that listens to software/hardware input streams.

Pure Data

  • Pure Data (aka Pd) is an open source visual programming language. Pd enables musicians, visual artists, performers, researchers, and developers to create software graphically, without writing lines of code. Pd is used to process and generate sound, video, 2D/3D graphics, and interface sensors, input devices, and MIDI. Pd can easily work over local and remote networks to integrate wearable technology, motor systems, lighting rigs, and other equipment. Pd is suitable for learning basic multimedia processing and visual programming methods as well as for realizing complex systems for large-scale projects. 
http://linux4vjs.net/sample-page/

Streaming


  • Livestreamer is a command-line utility that pipes video streams from various services into a video player, such as VLC. The main purpose of Livestreamer is to allow the user to avoid buggy and CPU heavy flash plugins but still be able to enjoy various streamed content.

BitTorrent

See also Transfer#BitTorrent

Services

YouTube

Reddit

Other


Players

mplayer

p
  Toggle pause/play.
Space
  Toggle pause/play.
Backspace
  Return to menu when using dvdnav.
←
  Seek backward ten seconds.
→
  Seek forward ten seconds.
↓
  Seek backward one minute.
↑
  Seek forward one minute.
<
  Go back in the playlist.
>
  Go forward in the playlist.
m
  Mute the sound.
0
  Volume up.
9
  Volume down.
f
  Toggle fullscreen mode.
o
  Toggle OSD state.
v
  Toggle subtitle visibility.
I
  Show filename.
1, 2
  Adjust contrast.
3, 4
  Adjust brightness.
j
  Cycle through the available subtitles.
#
  Cycle through the available audio tracks.

mpv

VLC

other

DVB TV

w_scan -ft -c [country_code] > ~/channels.conf

Viewing

TV

Ratings

Formats

DVD

DV

UHD / 4K

Hardware



Aspect ratio and resolution

Most common display resolutions in the first half of 2012
Acronym Aspect ratio Width (px) Height (px) % of Steam users % of web users
VGA 4:3 640 480 0.02 n/a
SVGA 4:3 800 600 0.17 1.03
WSVGA 17:10 1024 600 0.31 2.25
XGA 4:3 1024 768 5.53 18.69
XGA+ 4:3 1152 864 0.87 1.55
WXGA 16:9 1280 720 1.51 1.54
WXGA 5:3 1280 768 n/a 1.54
WXGA 16:10 1280 800 4.25 12.97
SXGA– (UVGA) 4:3 1280 960 0.72 0.72
SXGA 5:4 1280 1024 10.66 7.49
HD ~16:9 1360 768 2.36 2.28
HD ~16:9 1366 768 17.19 19.14
SXGA+ 4:3 1400 1050 0.18 n/a
WXGA+ 16:10 1440 900 7.60 6.61
HD+ 16:9 1600 900 6.82 3.82
UXGA 4:3 1600 1200 0.53 n/a
WSXGA+ 16:10 1680 1050 10.26 3.66
FHD 16:9 1920 1080 25.04 5.09
WUXGA 16:10 1920 1200 3.65 1.11
QWXGA 16:9 2048 1152 0.13 n/a
WQHD 16:9 2560 1440 0.72 0.36
WQXGA 16:10 2560 1600 0.19 n/a
3:4 768 1024 n/a 1.93
16:9 1093 614 n/a 0.63
~16:9 1311 737 n/a 0.35
Other 1.29 7.25
  • 480i (NTSC standard uses an analog system of 486i split into two interlaced fields of 243 lines)
  • 576i (PAL, 720 × 576 split into two interlaced fields of 288 lines)

Enhanced-definition television (EDTV):

  • 480p (720 × 480 progressive scan)
  • 576p (720 × 576 progressive scan)

High-definition television (HDTV):

  • 720p (1280 × 720 progressive scan) - 0.9 megapixels
  • https://en.wikipedia.org/wiki/1080i (1920 × 1080 split into two interlaced fields of 540 lines)
  • 1080p (1920 × 1080 progressive scan)

Ultra-high-definition television (UHDTV)

  • 2160p/4K (3840 × 2160 progressive scan)
  • 4320p/8K (7680 × 4320 progressive scan)

framerate; http://www.kk.org/thetechnium/archives/2013/01/pain_of_the_new

Subtitles

Projection

Video wall

3D

Historic

Demos and intros

Amiga

(http://www.8bitplus.co.uk/projects/amiga-1200-desktop/)

Flash

Research

Cameras

Other

  • OpenCV (Open Source Computer Vision Library) is an open source computer vision and machine learning software library. OpenCV was built to provide a common infrastructure for computer vision applications and to accelerate the use of machine perception in the commercial products. Being a BSD-licensed product, OpenCV makes it easy for businesses to utilize and modify the code.
  • http://vincent.is/turning-a-laptop-into-cctv/





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