25 lines
890 B
Go
25 lines
890 B
Go
package ffmpeg
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import "fmt"
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// Options represents transcoding options.
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type Options struct {
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Bin string
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Encoder AvcEncoder
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Size int
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Bitrate string
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MapVideo string
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MapAudio string
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}
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// VideoFilter returns the FFmpeg video filter string based on the size limit in pixels and the pixel format.
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func (o Options) VideoFilter(format PixelFormat) string {
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// scale specifies the FFmpeg downscale filter, see http://trac.ffmpeg.org/wiki/Scaling.
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if format == "" {
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return fmt.Sprintf("scale='if(gte(iw,ih), min(%d, iw), -2):if(gte(iw,ih), -2, min(%d, ih))'", o.Size, o.Size)
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} else if format == FormatQSV {
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return fmt.Sprintf("scale_qsv=w='if(gte(iw,ih), min(%d, iw), -1)':h='if(gte(iw,ih), -1, min(%d, ih))'", o.Size, o.Size)
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} else {
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return fmt.Sprintf("scale='if(gte(iw,ih), min(%d, iw), -2):if(gte(iw,ih), -2, min(%d, ih))',format=%s", o.Size, o.Size, format)
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}
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}
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