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resulotions.go
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/
resulotions.go
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package main
import (
"context"
"fmt"
"log"
"os/exec"
"strconv"
"strings"
"time"
)
type resolution struct {
width int
height int
crf int
vBitRate int
}
func (r *resolution) String() string {
return fmt.Sprintf("%d:%d", r.width, r.height)
}
func (r *resolution) Name() string {
return fmt.Sprintf("%dp", r.width)
}
var resolutions = []resolution{
{240, 426, 22, 400},
{360, 640, 24, 800},
{480, 842, 24, 1400},
{720, 1280, 25, 2800},
{1080, 1920, 26, 5000},
}
func generateResolutions(ctx context.Context, i string, tf string) ([]string, error) {
var out []string
cw, _, err := sourceRes(ctx, i)
if err != nil {
return nil, err
}
log.Println("Source width:", cw)
for _, r := range resolutions {
if r.width > cw {
continue
}
outF, err := generateVideoRes(ctx, r, i, tf)
if err != nil {
return nil, err
}
log.Printf("Generated %s", outF)
out = append(out, outF)
}
return out, nil
}
func generateResolutionsConcurrent(ctx context.Context, i string, tf string) ([]string, error) {
// start time
start := time.Now()
cw, _, err := sourceRes(ctx, i)
if err != nil {
return nil, err
}
log.Println("Source width:", cw)
rls := filter(resolutions, func(r resolution) bool {
return r.width <= cw
})
res := RunWorkersPool(&Pool[resolution, string]{
Workers: 2,
Data: rls,
Consumer: func(r resolution) string {
// log generating resolution
log.Printf("Generating %s", r.String())
outF, err := generateVideoRes(ctx, r, i, tf)
if err != nil {
log.Printf("Error in [generateVideoRes] %s", err)
return ""
}
log.Printf("Generated %s", outF)
return outF
},
})
// end time
end := time.Now()
log.Printf("Time taken: %fs", end.Sub(start).Seconds())
return res, nil
}
func sourceRes(ctx context.Context, i string) (int, int, error) {
c := fmt.Sprintf("ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=s=x:p=0 %s", i)
args := strings.Split(c, " ")
cmd := exec.CommandContext(ctx, args[0], args[1:]...)
log.Println(args)
o, err := cmd.CombinedOutput()
if err != nil {
log.Print("Error in [sourceRes]", string(o))
return 0, 0, err
}
w, h, pE := parseRes(strings.Trim(string(o), "\n"))
if pE != nil {
return 0, 0, pE
}
return w, h, nil
}
func parseRes(res string) (int, int, error) {
v := strings.Split(res, "x")
if len(v) != 2 {
return 0, 0, fmt.Errorf("invalid resolution %s", res)
}
w, err := strconv.ParseInt(v[1], 10, 32)
if err != nil {
return 0, 0, err
}
h, err := strconv.ParseInt(v[0], 10, 32)
if err != nil {
return 0, 0, err
}
return int(w), int(h), nil
}
func generateVideoRes(ctx context.Context, r resolution, i string, tf string) (string, error) {
outF := fmt.Sprintf("%s_%s.mp4", tf, r.Name())
cmn := `-preset slow -tune film -vsync passthrough -an -c:v libx264`
c := fmt.Sprintf(
`ffmpeg -y -i %s %s -crf %d -b:v %dk -pix_fmt yuv420p -vf scale=%s -f mp4 %s`,
i,
cmn,
r.crf,
r.vBitRate,
r.String(),
outF,
)
args := strings.Split(c, " ")
cmd := exec.CommandContext(ctx, args[0], args[1:]...)
log.Println(args)
o, err := cmd.CombinedOutput()
if err != nil {
log.Print(string(o))
return "", err
}
return outF, nil
}
func filter[T any](d []T, cond func(v T) bool) []T {
var out []T
for _, v := range d {
if cond(v) {
out = append(out, v)
}
}
return out
}