背景

Chrome在104/105版本后，支持硬解h265，使得hls利用浏览器硬解特性播放h265视频。hls官方要求h265必须使用fmp4格式进行封装，因此本篇使用ffmpeg采集摄像头fmp4+h265 aac切片，并使用hls.js demo在chrome浏览器中播放测试。

环境

操作系统：macos 11.6.1

浏览器： chrome 107，查看是否支持硬解("h265" | Can I use... Support tables for HTML5, CSS3, etc)

ffmpeg版本：5.1.2，支持libx265

hls.js demo版本：v1.2.7

FFmpeg实现fmp4+h265 aac切片命令

ffmpeg -f avfoundation -video_size 640x480 -framerate 30 -i "0:0" -c:v libx265 -tag:v hvc1 -c:a aac \
-map 0 \
-f hls \
-hls_time 10 \
-hls_flags delete_segments+append_list+split_by_time \
-hls_segment_type fmp4 \
-hls_list_size 10 \
-hls_playlist_type vod \
stream.m3u8

切片后的文件如下：

➜  fmp4-h265 tree
.
├── init.mp4
├── stream.m3u8
├── stream0.m4s
├── stream1.m4s
├── stream2.m4s
├── stream3.m4s
├── stream4.m4s
├── stream5.m4s
└── stream6.m4s

0 directories, 9 files

使用go创建hls server

package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
	"strings"
	"time"
)

var filePath = "./" //切片路径

func onHLSVod(w http.ResponseWriter, r *http.Request) {
	buf := bytes.NewBuffer(make([]byte, 0, 1024*1024))
	if strings.LastIndex(r.URL.Path, "m3u8") != -1 {
		fmt.Println("request m3u8", r.URL.Path)
		m3u8, err := os.Open(filePath + "stream.m3u8")
		if err != nil {
			return
		}
		defer m3u8.Close()
		b, _ := ioutil.ReadAll(m3u8)
		buf.Write(b)
		w.Header().Add("Content-Type", "application/vnd.apple.mpegurl")
	} else {
		fmt.Println("request fmp4", r.URL.Path)
		fmp4File := strings.TrimLeft(r.URL.Path, "/vod/")
		fmp4, err := os.Open(filePath + fmp4File)
		if err != nil {
			return
		}
		defer fmp4.Close()
		b, _ := ioutil.ReadAll(fmp4)
		buf.Write(b)
		w.Header().Set("Content-Type", "video/mp4")
	}
	w.Header().Set("Content-Length", fmt.Sprintf("%d", buf.Len()))
	w.Header().Set("Access-Control-Allow-Origin", "*")
	w.Header().Set("Access-Control-Allow-Headers", "*")
	w.Header().Set("Access-Control-Allow-Credentials", "true")
	w.Write(buf.Bytes())
}

//http://127.0.0.1:19999/vod/stream.m3u8
func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/vod/", onHLSVod)
	server := http.Server{
		Addr:         ":19999",
		Handler:      mux,
		ReadTimeout:  time.Second * 10,
		WriteTimeout: time.Second * 10,
	}
	fmt.Println("server.listen")
	fmt.Println(server.ListenAndServe())
}

使用ffplay播放测试下