68 lines
1.1 KiB
Go
68 lines
1.1 KiB
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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// BUG(): always produces ASPECT_SVELTE shape - need to re-pad for ASPECT_PADDED
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var vcodec string
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switch this.ofmt {
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case OUTPUT_JPG:
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vcodec = "mjpeg" // yes really
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case OUTPUT_PNG_CRUSH:
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vcodec = "png"
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default:
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return nil, ErrInvalidOption
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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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"-timelimit", "10", // seconds
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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", vcodec,
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"-",
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)
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// -ss 00:00:30
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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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