53 lines
798 B
Go
53 lines
798 B
Go
package thumbnail
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import (
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"bytes"
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"fmt"
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"io"
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"os/exec"
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)
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func (this *Thumbnailer) RenderScaledFfmpeg(absPath string) ([]byte, error) {
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scaleCmd := fmt.Sprintf(
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`thumbnail,scale='if(gt(a,%d/%d),%d,-1)':'if(gt(a,%d/%d),-1,%d)'`,
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this.Height, this.Width, this.Height,
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this.Height, this.Width, this.Width,
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)
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cmd := exec.Command(
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"ffmpeg",
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"-loglevel", "0",
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"-an",
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"-i", absPath,
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"-vf", scaleCmd,
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"-frames:v", "1",
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"-f", "image2pipe",
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"-c:v", "png",
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"-",
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)
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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return nil, err
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}
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err = cmd.Start()
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if err != nil {
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return nil, err
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}
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out := bytes.Buffer{}
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_, err = io.Copy(&out, stdout)
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if err != nil {
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return nil, err
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}
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err = cmd.Wait()
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if err != nil {
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return nil, err
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}
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return out.Bytes(), nil
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}
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