hls muxer: improve performance, decrease memory consumption

go.mod

@@ -13,8 +13,8 @@ require (
 	github.com/grafov/m3u8 v0.11.1
 	github.com/icza/bitio v1.1.0
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
-	github.com/notedit/rtmp v0.0.2
-	github.com/orcaman/writerseeker v0.0.0-20200621085525-1d3f536ff85e
+	github.com/notedit/rtmp v0.0.0
+	github.com/orcaman/writerseeker v0.0.0
 	github.com/pion/rtp v1.7.13
 	github.com/stretchr/testify v1.7.1
 	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
@@ -51,3 +51,5 @@ require (
 )
 
 replace github.com/notedit/rtmp => github.com/aler9/rtmp v0.0.0-20210403095203-3be4a5535927
+
+replace github.com/orcaman/writerseeker => github.com/aler9/writerseeker v0.0.0-20220601075008-6f0e685b9c82

go.sum

@@ -10,6 +10,8 @@ github.com/aler9/gortsplib v0.0.0-20220529122539-7c2e3c03d1f4 h1:5gd/tqApfqpfjCA
 github.com/aler9/gortsplib v0.0.0-20220529122539-7c2e3c03d1f4/go.mod h1:i1e4CEs42IrbidMUNTSNOKmeGPCOHVX9P3BvPxzyMtI=
 github.com/aler9/rtmp v0.0.0-20210403095203-3be4a5535927 h1:95mXJ5fUCYpBRdSOnLAQAdJHHKxxxJrVCiaqDi965YQ=
 github.com/aler9/rtmp v0.0.0-20210403095203-3be4a5535927/go.mod h1:vzuE21rowz+lT1NGsWbreIvYulgBpCGnQyeTyFblUHc=
+github.com/aler9/writerseeker v0.0.0-20220601075008-6f0e685b9c82 h1:9WgSzBLo3a9ToSVV7sRTBYZ1GGOZUpq4+5H3SN0UZq4=
+github.com/aler9/writerseeker v0.0.0-20220601075008-6f0e685b9c82/go.mod h1:qsMrZCbeBf/mCLOeF16KDkPu4gktn/pOWyaq1aYQE7U=
 github.com/asticode/go-astikit v0.20.0 h1:+7N+J4E4lWx2QOkRdOf6DafWJMv6O4RRfgClwQokrH8=
 github.com/asticode/go-astikit v0.20.0/go.mod h1:h4ly7idim1tNhaVkdVBeXQZEE3L0xblP7fCWbgwipF0=
 github.com/asticode/go-astits v1.10.0/go.mod h1:DkOWmBNQpnr9mv24KfZjq4JawCFX1FCqjLVGvO0DygQ=
@@ -92,8 +94,6 @@ github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7J
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
 github.com/onsi/gomega v1.16.0 h1:6gjqkI8iiRHMvdccRJM8rVKjCWk6ZIm6FTm3ddIe4/c=
 github.com/onsi/gomega v1.16.0/go.mod h1:HnhC7FXeEQY45zxNK3PPoIUhzk/80Xly9PcubAlGdZY=
-github.com/orcaman/writerseeker v0.0.0-20200621085525-1d3f536ff85e h1:s2RNOM/IGdY0Y6qfTeUKhDawdHDpK9RGBdx80qN4Ttw=
-github.com/orcaman/writerseeker v0.0.0-20200621085525-1d3f536ff85e/go.mod h1:nBdnFKj15wFbf94Rwfq4m30eAcyY9V/IyKAGQFtqkW0=
 github.com/pion/randutil v0.1.0 h1:CFG1UdESneORglEsnimhUjf33Rwjubwj6xfiOXBa3mA=
 github.com/pion/randutil v0.1.0/go.mod h1:XcJrSMMbbMRhASFVOlj/5hQial/Y8oH/HVo7TBZq+j8=
 github.com/pion/rtcp v1.2.9 h1:1ujStwg++IOLIEoOiIQ2s+qBuJ1VN81KW+9pMPsif+U=

internal/hls/mp4writer.go

@@ -89,6 +89,5 @@ func (w *mp4Writer) rewriteBox(off int, box mp4.IImmutableBox) error {
 }
 
 func (w *mp4Writer) bytes() []byte {
-	byts, _ := io.ReadAll(w.buf.Reader())
-	return byts
+	return w.buf.Bytes()
 }