digital_video_introduction
SVT-AV1
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digital_video_introduction | SVT-AV1 | |
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8 | 30 | |
15,095 | 1,320 | |
- | - | |
6.2 | 9.3 | |
8 months ago | about 3 years ago | |
Jupyter Notebook | C | |
BSD 3-clause "New" or "Revised" License | GNU General Public License v3.0 or later |
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digital_video_introduction
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Breakdown of AV1 Video Codec
There's a great introduction to video tech, including codecs, at https://github.com/leandromoreira/digital_video_introduction
- A Hands-On Introduction to Video Codec Technology and FFmpeg
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Topics to cover in a 101 AV class
A couple of AV centric scenarios I'd explore: - Set up two speakers fed with a mono signal, flip the phase on one and have students move around the area. From this introduce constructive and destructive interference and some basic acoustics. - Using an oscilloscope (or just prepped graphics) show a sine wave on an unbalanced line, how this is paired with an inverted copy of itself on a balanced line, and how this works to cancel transmission noise. - With an analogue signal now pictured, introduce analogue to digital conversion and what sample rate and bit depth mean. From this you can also start to introduce why gain staging is important in both pure analogue systems and those where you're bouncing between analogue and digital domains. - Introduce video: colour channels, different ways of representing colour and some (very surface level) compression basics like chroma subsampling. Really good resource for that here. - Introduce base patterns for getting any signals arounds: dedicated circuits (analogue audio, HDMI video, RS-232 control, logic IO) and network based (again for audio, video, and control). Dive intro signal flow, how to read a schematic and where reasoning about each of these modes differs.
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Crestron DMC-D-4K Class Tips/Things to Watch out For
If you want to keep digging from there, get familiar with the compression on NVX, JPEG-XS, and how it behaves. intoPIX are the upstream vendor that do some of the NVX internals and have some great resources on that here: https://www.intopix.com/jpeg-xs. For a guide on all things digital video I also highly recommend https://github.com/leandromoreira/digital_video_introduction.
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[OC] Finally managed to sync the moshing effect to the beat of the music, here's what it looks like on a small test section of a music video
Edit: After finishing writing the comment, I realized that it was more technical than I intended, and assumes that the reader has a basic to medium understanding of video compression. If not, I recommend this writeup/tutorial of digital video, especially the section about frame types.
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Ask HN: How can I learn about video encoding, h.264, ffmpeg, etc.
A good high-level breakdown of H.264: https://sidbala.com/h-264-is-magic/
Associated HN post (although there have been a few): https://news.ycombinator.com/item?id=30710574
More technical: https://github.com/leandromoreira/digital_video_introduction...
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H.264 is magic: a technical walkthrough
For those interested in this topic, I highly recommend the approachable but more extensive technical introduction at https://github.com/leandromoreira/digital_video_introduction
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Help and guidance for a Coding interview for the role of Media Video Engineer (Video Quality)
Go look at this. https://github.com/leandromoreira/digital_video_introduction
SVT-AV1
- FFmpeg now supports JPEG XL and AVIF: how to convert images
- Recommended rate control settings for SVT-AV1 streaming
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Converting big video library with av1
I wrote a little script that uses ffmpeg with settings similar to those in the guide, and then another ffmpeg run to extract the subtitles as vtt. I would be happy to share more of my settings if you are interested. Of course, your needs and mine may differ.
- No library usage documentation for SVT-AV1?
- AOM or SVT-AV1 on 5950X? video is 8K 60fps 60Mbit/s
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SVT-AV1 HDR Encoding (libsvtav1 with ffmpeg)
How about use the parameter "HighDynamicRangeInput" with command line "--enable-hdr 1"? It's from the official page: https://github.com/AOMediaCodec/SVT-AV1/blob/master/Docs/Parameters.md
- Scalable Video Technology for AV1 (SVT-AV1 Encoder and Decoder)
- AV1 Video Codec
- Seems like the SVT-AV1 documentation issue #1753 about missing presets explanation is fixed now. And it seems like the preset 0, 1 and 2 are the same thing. Plus tons of other useful encoding guidelines (like how to tune for animation etc.).
- H.264 is magic: a technical walkthrough
What are some alternatives?
PHP-FFmpeg-video-streaming - 📼 Package media content for online streaming(DASH and HLS) using FFmpeg
obs-amd-encoder - AMD Advanced Media Framework Encoder Plugin for Open Broadcaster Studio
Av1an - Cross-platform command-line AV1 / VP9 / HEVC / H264 encoding framework with per scene quality encoding
rav1e - The fastest and safest AV1 encoder.
VVCEasy - VVCEasy is that you don't have to compile or/and coding to encode VVC (known as Versatile Video Codec). Simple. Easy. Encode. Decode
waifu2x - Image Super-Resolution for Anime-Style Art
NotEnoughAV1Encodes - GUI for AV1 (aomenc, rav1e & svt-av1)
SVT-HEVC - SVT HEVC encoder. Scalable Video Technology (SVT) is a software-based video coding technology that is highly optimized for Intel® Xeon® processors. Using the open source SVT-HEVC encoder, it is possible to spread video encoding processing across multiple Intel® Xeon® processors to achieve a real advantage of processing efficiency.
SwiftFFmpeg - A Swift wrapper for the FFmpeg API
community - libaom User Wiki
Ant-Media-Server - Ant Media Server is a live streaming engine software that provides adaptive, ultra low latency streaming by using WebRTC technology with ~0.5 seconds latency. Ant Media Server is auto-scalable and it can run on-premise or on-cloud.
kvazaar - An open-source HEVC encoder