Added find output format

output_format.go

@@ -3,6 +3,7 @@ package astiav
 //#cgo pkg-config: libavformat
 //#include <libavformat/avformat.h>
 import "C"
+import "unsafe"
 
 // https://github.com/FFmpeg/FFmpeg/blob/n5.0/libavformat/avformat.h#L503
 type OutputFormat struct {
@@ -16,6 +17,25 @@ func newOutputFormatFromC(c *C.struct_AVOutputFormat) *OutputFormat {
 	return &OutputFormat{c: c}
 }
 
+func FindOutputFormat(name string) *OutputFormat {
+	cname := C.CString(name)
+	defer C.free(unsafe.Pointer(cname))
+	return newOutputFormatFromC(C.av_guess_format(cname, nil, nil))
+}
+
 func (f *OutputFormat) Flags() IOFormatFlags {
 	return IOFormatFlags(f.c.flags)
 }
+
+func (f *OutputFormat) Name() string {
+	return C.GoString(f.c.name)
+}
+
+// LongName Description of the format, meant to be more human-readable than Name.
+func (f *OutputFormat) LongName() string {
+	return C.GoString(f.c.long_name)
+}
+
+func (f *OutputFormat) String() string {
+	return f.Name()
+}

output_format_test.go

@@ -0,0 +1,16 @@
+package astiav
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestOutputFormat(t *testing.T) {
+	formatName := "rawvideo"
+	outputFormat := FindOutputFormat(formatName)
+	require.NotNil(t, outputFormat)
+	require.Equal(t, formatName, outputFormat.Name())
+	require.Equal(t, formatName, outputFormat.String())
+	require.Equal(t, "raw video", outputFormat.LongName())
+}