https://github.com/lieff/minih264

Minimalistic H264/SVC encoder single header library
https://github.com/lieff/minih264

codec encoder encoding h264 h264-svc mini minimal single-header single-header-lib svc video video-codec x264

Last synced: 6 days ago
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Minimalistic H264/SVC encoder single header library

• Host: GitHub
• URL: https://github.com/lieff/minih264
• Owner: lieff
• License: cc0-1.0
• Created: 2018-09-20T19:18:46.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2020-12-10T15:56:51.000Z (about 4 years ago)
• Last Synced: 2025-01-13T01:05:56.657Z (13 days ago)
• Topics: codec, encoder, encoding, h264, h264-svc, mini, minimal, single-header, single-header-lib, svc, video, video-codec, x264
• Language: C
• Size: 29.5 MB
• Stars: 541
• Watchers: 27
• Forks: 53
• Open Issues: 4
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• AwesomeCppGameDev - minih264

README

        
minih264

==========

[![Build Status](https://travis-ci.org/lieff/minih264.svg)](https://travis-ci.org/lieff/minih264)

Small, but yet reasonably fast H264/SVC encoder single-header library with SSE/NEON optimizations.

Decoder can be popped up in future.

Disclaimer: code highly experimental.

## Comparison with [x264](https://www.videolan.org/developers/x264.html)

Rough comparison with x264 on an i7-6700K:

`x264 -I 30 --profile baseline --preset veryfast --tune zerolatency -b 0 -r 1 --qp 33 --ipratio 1.0 --qcomp 1.0 -o x264.264 --fps 30 vectors/foreman.cif --input-res 352x288 --slices 1 --threads 1`

vs

`./h264enc_x64 vectors/foreman.cif`

| x264         | minih264 |

| ------------ | -------- |

| source: ~4.6mb | 409kb |

| binary: 1.2mb | 100kb |

| time: 0,282s | 0,503s |

| out size: 320kb | 391kb  |

PSNR:

```

x264:     PSNR y:32.774824 u:38.874450 v:39.926132 average:34.084281 min:31.842667 max:36.630286

minih264: PSNR y:33.321686 u:38.858879 v:39.955914 average:34.574459 min:32.389171 max:37.174073

```

First intra frame screenshot (left-to-right: original 152064, minih264 5067, x264 5297 bytes):

![Intra screenshot](images/intra.png?raw=true)

You can compare results in motion using ffplay/mpv players on vectors/out_ref.264 and vectors/x264.264 .

## Usage

TBD

## SVC

Minih264 supports both spatial and temporal layers. Spatial layers are almost same as encode 2 independent AVC streams except for Intra frames prediction.

Following diagram shows minih264 SVC scheme for two spatial layers:

![SVC diargam](images/svc.png?raw=true)

That's because P frames spatial prediction are almost useless in practice. But for Intra frames there is a ~20% benefit in full resolution frame size.

Note that decoder must have both base layer I frame _and_ full resolution SVC I frame to decode whole sequence of next P frames in full resolution.

## Limitations

The following major features are not supported compared to x264 (baseline):

 * Trellis quantization.

 * Select prediction mode using Sum of Absolute Transform Differences (SATD).

 * 4x4 motion compensation.

## Interesting links

 * https://www.videolan.org/developers/x264.html

 * https://www.openh264.org/

 * https://github.com/cisco/openh264

 * http://iphome.hhi.de/suehring/tml/

 * https://github.com/oneam/h264bsd

 * https://github.com/fhunleth/hollowcore-h264

 * https://github.com/digetx/h264_decoder

 * https://github.com/lspbeyond/p264decoder

 * https://github.com/jcasal-homer/HomerHEVC

 * https://github.com/ultravideo/kvazaar

 * https://github.com/neocoretechs/h264j

 * https://github.com/jcodec/jcodec