2023-10-31 09:16:44 CST W44D2

examples/show-metadata/main.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	ffmpeg "github.com/qrtc/ffmpeg-dev-go"
+)
+
+func main() {
+	var fmtCtx *ffmpeg.AVFormatContext
+	var tag *ffmpeg.AVDictionaryEntry
+	var ret int32
+
+	if len(os.Args) != 2 {
+		fmt.Fprintf(os.Stderr, "usage: %s <input_file>\n"+
+			"example program to demonstrate the use of the libavformat metadata API.\n"+
+			"\n", os.Args[0])
+		os.Exit(1)
+	}
+
+	if ret = ffmpeg.AvFormatOpenInput(&fmtCtx, os.Args[1], nil, nil); ret != 0 {
+		os.Exit(int(ret))
+	}
+
+	if ret = ffmpeg.AvFormatFindStreamInfo(fmtCtx, nil); ret < 0 {
+		ffmpeg.AvLog(nil, ffmpeg.AV_LOG_ERROR, "Cannot find stream information\n")
+		os.Exit(int(ret))
+	}
+
+	for {
+		if tag = ffmpeg.AvDictGet(fmtCtx.GetMetadata(), "", tag, ffmpeg.AV_DICT_IGNORE_SUFFIX); tag == nil {
+			break
+		}
+		fmt.Fprintf(os.Stdout, "%s=%s\n", tag.GetKey(), tag.GetValue())
+	}
+
+	ffmpeg.AvFormatCloseInput(&fmtCtx)
+	os.Exit(0)
+}