diff --git a/pkg/aac/README.md b/pkg/aac/README.md
index bb81f736..8e56a9ac 100644
--- a/pkg/aac/README.md
+++ b/pkg/aac/README.md
@@ -1,17 +1,17 @@
 ## AAC-LD and AAC-ELD
 
-Codec | Rate | QuickTime | ffmpeg | VLC
-------|------|-----------|--------|----
-AAC-LD  | 8000  | yes | no  | no
-AAC-LD  | 16000 | yes | no  | no
-AAC-LD  | 22050 | yes | yes | no
-AAC-LD  | 24000 | yes | yes | no
-AAC-LD  | 32000 | yes | yes | no
-AAC-ELD | 8000  | yes | no  | no
-AAC-ELD | 16000 | yes | no  | no
-AAC-ELD | 22050 | yes | yes | yes
-AAC-ELD | 24000 | yes | yes | yes
-AAC-ELD | 32000 | yes | yes | yes
+| Codec   | Rate  | QuickTime | ffmpeg | VLC |
+|---------|-------|-----------|--------|-----|
+| AAC-LD  | 8000  | yes       | no     | no  |
+| AAC-LD  | 16000 | yes       | no     | no  |
+| AAC-LD  | 22050 | yes       | yes    | no  |
+| AAC-LD  | 24000 | yes       | yes    | no  |
+| AAC-LD  | 32000 | yes       | yes    | no  |
+| AAC-ELD | 8000  | yes       | no     | no  |
+| AAC-ELD | 16000 | yes       | no     | no  |
+| AAC-ELD | 22050 | yes       | yes    | yes |
+| AAC-ELD | 24000 | yes       | yes    | yes |
+| AAC-ELD | 32000 | yes       | yes    | yes |
 
 ## Useful links
 
diff --git a/pkg/core/helpers.go b/pkg/core/helpers.go
index 98c842e0..ca288834 100644
--- a/pkg/core/helpers.go
+++ b/pkg/core/helpers.go
@@ -6,8 +6,6 @@ import (
 	"strconv"
 	"strings"
 	"time"
-
-	"github.com/rs/zerolog/log"
 )
 
 const (
@@ -77,7 +75,6 @@ func Assert(ok bool) {
 }
 
 func Caller() string {
-	log.Error().Caller(0).Send()
 	_, file, line, _ := runtime.Caller(1)
 	return file + ":" + strconv.Itoa(line)
 }
diff --git a/pkg/core/track.go b/pkg/core/track.go
index a2e2575f..ae4b6382 100644
--- a/pkg/core/track.go
+++ b/pkg/core/track.go
@@ -10,6 +10,13 @@ import (
 	"github.com/pion/rtp"
 )
 
+type Packet struct {
+	PayloadType uint8
+	Sequence    uint16
+	Timestamp   uint32
+	Payload     []byte
+}
+
 var ErrCantGetTrack = errors.New("can't get track")
 
 type Receiver struct {
diff --git a/pkg/mpegts/checksum.go b/pkg/mpegts/checksum.go
index 82f5357a..e059d06e 100644
--- a/pkg/mpegts/checksum.go
+++ b/pkg/mpegts/checksum.go
@@ -1,5 +1,7 @@
 package mpegts
 
+// have to create this table manually because it is in another endian
+// https://github.com/arturvt/TSreader/blob/master/src/br/ufpe/cin/tool/mpegts/CRC32.java
 var table = [256]uint32{
 	0x00000000, 0xB71DC104, 0x6E3B8209, 0xD926430D, 0xDC760413, 0x6B6BC517,
 	0xB24D861A, 0x0550471E, 0xB8ED0826, 0x0FF0C922, 0xD6D68A2F, 0x61CB4B2B,
@@ -46,7 +48,8 @@ var table = [256]uint32{
 	0x6D66B4BC, 0xDA7B75B8, 0x035D36B5, 0xB440F7B1,
 }
 
-func calcCRC32(crc uint32, data []byte) uint32 {
+func checksum(data []byte) uint32 {
+	crc := uint32(0xFFFFFFFF)
 	for _, b := range data {
 		crc = table[b^byte(crc)] ^ (crc >> 8)
 	}
diff --git a/pkg/mpegts/writer.go b/pkg/mpegts/writer.go
index 188509e3..b8ad54c9 100644
--- a/pkg/mpegts/writer.go
+++ b/pkg/mpegts/writer.go
@@ -44,7 +44,7 @@ func (w *Writer) MarkChecksum() {
 }
 
 func (w *Writer) WriteChecksum() {
-	crc := calcCRC32(0xFFFFFFFF, w.b[w.m:])
+	crc := checksum(w.b[w.m:])
 	w.b = append(w.b, byte(crc), byte(crc>>8), byte(crc>>16), byte(crc>>24))
 }