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package media
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import (
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"bytes"
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"fmt"
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"image"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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)
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func VideoFrame(filename string) (image.Image, error) {
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cmd := exec.Command("ffmpeg", "-i", filename, "-vframes", "1", "-f", "singlejpeg", "-")
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buffer := new(bytes.Buffer)
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cmd.Stdout = buffer
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if cmd.Run() != nil {
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return nil, fmt.Errorf("could not generate frame")
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}
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img, _, err := image.Decode(buffer)
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return img, err
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}
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func VideoSize(filename string) (image.Rectangle, error) {
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img, err := VideoFrame(filename)
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if err != nil {
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return image.Rectangle{}, err
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}
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return img.Bounds(), nil
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}
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func VideoEncode(filename string, size image.Rectangle, thumbDir string) error {
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dest := thumbFilename(thumbDir, size, path.Base(filename))
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os.MkdirAll(filepath.Dir(dest), 0755)
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cmd := exec.Command("ffmpeg", "-i", filename, "-vf", fmt.Sprintf("scale=%d:%d", size.Dx(), size.Dy()), "-strict", "-2", dest)
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if out, err := cmd.CombinedOutput(); err != nil {
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os.Remove(dest)
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return fmt.Errorf("could not thumb video: %s", string(out))
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}
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return nil
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}
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