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ffmpeg.go
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ffmpeg.go
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package main
import (
"bufio"
"context"
"fmt"
"log"
"os/exec"
"path"
"time"
)
func hlsConvert(ctx context.Context, outputDir, rtspURL string) {
cmd := exec.Command(
"ffmpeg",
// quieter output
"-hide_banner", "-y",
"-loglevel", "error",
// reduce latency during input stream analysis
"-fflags", "nobuffer",
// rtsp over tcp
"-rtsp_transport", "tcp",
// heres our source
"-i", rtspURL,
// copy timestamps from rtsp stream
"-copyts",
// convert to h264 for firefox
"-vcodec", "libx264",
// scale to 1/2 source
"-filter:v", "scale=960:-1",
// fast, lossy encoding please
"-preset", "superfast",
"-crf", "40",
// fast encoding, low latency streaming
"-tune", "zerolatency",
// output as fragment on each keyframe
"-movflags", "frag_keyframe+empty_moov",
// drop audio
"-an",
// ask to cap our bitrate
"-maxrate", "500K",
"-bufsize", "1M",
// rate limit frames
"-r", "15",
// HLS should delete own segments and append as they go
"-hls_flags", "delete_segments+append_list",
"-f", "hls",
// try to make 1 second segments
"-hls_time", "1",
// keep 5 segments on disk
"-hls_list_size", "5",
"-hls_segment_type", "mpegts",
"-hls_segment_filename", path.Join(outputDir, fmt.Sprintf("%d_%%d.ts", time.Now().Unix())),
path.Join(outputDir, "index.m3u8"),
)
log.Println("Starting ffmpeg")
stderr, err := cmd.StderrPipe()
if err != nil {
log.Fatal(err)
}
go func() {
scanner := bufio.NewScanner(stderr)
for scanner.Scan() {
log.Println(scanner.Text())
}
}()
err = cmd.Start()
if err != nil {
log.Fatal(err)
}
ffmpegDone := make(chan error)
go func() {
ffmpegDone <- cmd.Wait()
close(ffmpegDone)
}()
select {
case <-ctx.Done():
log.Println("Cancelling ffmpeg")
err := cmd.Process.Kill()
if err != nil {
log.Printf("unable to kill ffmpeg: %v", err)
}
case err = <-ffmpegDone:
if err != nil {
log.Printf("ffmpeg finished with error: %v", err)
}
}
}