new file: go.mod

new file:   go.sum
new file:   vcodec.go
read video codec name

Author: squeeze69

go.mod

@@ -0,0 +1,5 @@
+module github.com/squeeze69/vcodec
+
+go 1.16
+
+require golang.org/x/image v0.0.0-20210607152325-775e3b0c77b9

go.sum

@@ -0,0 +1,4 @@
+golang.org/x/image v0.0.0-20210607152325-775e3b0c77b9 h1:D0iM1dTCbD5Dg1CbuvLC/v/agLc79efSj/L35Q3Vqhs=
+golang.org/x/image v0.0.0-20210607152325-775e3b0c77b9/go.mod h1:023OzeP/+EPmXeapQh35lcL3II3LrY8Ic+EFFKVhULM=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

vcodec.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"os"
+
+	"golang.org/x/image/riff"
+)
+
+func main() {
+	f, err := os.Open(os.Args[1])
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer f.Close()
+	formType, r, err := riff.NewReader(bufio.NewReader(io.LimitReader(f, 65000)))
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("RIFF(%s)\n", formType)
+	if err := dump(r, ".\t"); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func dump(r *riff.Reader, indent string) error {
+	for {
+		chunkID, chunkLen, chunkData, err := r.Next()
+		if err == io.EOF {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+		if chunkID == riff.LIST {
+			listType, list, err := riff.NewListReader(chunkLen, chunkData)
+			if err != nil {
+				return err
+			}
+			fmt.Printf("%sLIST(%s)\n", indent, listType)
+			if err := dump(list, indent+".\t"); err != nil {
+				return err
+			}
+			continue
+		}
+		b, err := ioutil.ReadAll(chunkData)
+		if err != nil {
+			return err
+		}
+		if string(b[0:4]) == "vids" {
+			log.Printf("_%s_", string(b[4:8]))
+		}
+		fmt.Printf("%s%s %q\n", indent, chunkID, b)
+	}
+}