diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index cc7a6ddb..f9fca553 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -40,3 +40,11 @@ jobs:
         go-version: "1.20"
 
     - run: make test-highlevel-nodocker
+
+  test32:
+    runs-on: ubuntu-22.04
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - run: make test32
diff --git a/Makefile b/Makefile
index 654d9fc0..34e2ad84 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,7 @@ help:
 	@echo "  mod-tidy        run go mod tidy"
 	@echo "  format          format source files"
 	@echo "  test            run tests"
+	@echo "  test32          run tests on a 32-bit system"
 	@echo "  test-highlevel  run high-level tests"
 	@echo "  lint            run linter"
 	@echo "  bench           run benchmarks"
diff --git a/internal/highleveltests/server_test.go b/internal/highleveltests/server_test.go
index 59d8573c..af497901 100644
--- a/internal/highleveltests/server_test.go
+++ b/internal/highleveltests/server_test.go
@@ -215,7 +215,7 @@ func (c *container) wait() int {
 	exec.Command("docker", "wait", "gortsplib-test-"+c.name).Run()
 	out, _ := exec.Command("docker", "inspect", "gortsplib-test-"+c.name,
 		"--format={{.State.ExitCode}}").Output()
-	code, _ := strconv.ParseInt(string(out[:len(out)-1]), 10, 64)
+	code, _ := strconv.ParseInt(string(out[:len(out)-1]), 10, 32)
 	return int(code)
 }
 
diff --git a/pkg/base/response.go b/pkg/base/response.go
index db3d20d0..20336495 100644
--- a/pkg/base/response.go
+++ b/pkg/base/response.go
@@ -150,11 +150,11 @@ func (res *Response) Unmarshal(br *bufio.Reader) error {
 	}
 	statusCodeStr := string(byts[:len(byts)-1])
 
-	statusCode64, err := strconv.ParseInt(statusCodeStr, 10, 32)
+	tmp, err := strconv.ParseUint(statusCodeStr, 10, 31)
 	if err != nil {
 		return fmt.Errorf("unable to parse status code")
 	}
-	res.StatusCode = StatusCode(statusCode64)
+	res.StatusCode = StatusCode(tmp)
 
 	byts, err = readBytesLimited(br, '\r', 255)
 	if err != nil {
diff --git a/pkg/formats/av1.go b/pkg/formats/av1.go
index ac11d5b0..e73de756 100644
--- a/pkg/formats/av1.go
+++ b/pkg/formats/av1.go
@@ -24,7 +24,7 @@ func (f *AV1) unmarshal(payloadType uint8, clock string, codec string, rtpmap st
 	for key, val := range fmtp {
 		switch key {
 		case "level-idx":
-			n, err := strconv.ParseUint(val, 10, 64)
+			n, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid level-idx: %v", val)
 			}
@@ -33,7 +33,7 @@ func (f *AV1) unmarshal(payloadType uint8, clock string, codec string, rtpmap st
 			f.LevelIdx = &v2
 
 		case "profile":
-			n, err := strconv.ParseUint(val, 10, 64)
+			n, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid profile: %v", val)
 			}
@@ -42,7 +42,7 @@ func (f *AV1) unmarshal(payloadType uint8, clock string, codec string, rtpmap st
 			f.Profile = &v2
 
 		case "tier":
-			n, err := strconv.ParseUint(val, 10, 64)
+			n, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid tier: %v", val)
 			}
diff --git a/pkg/formats/generic.go b/pkg/formats/generic.go
index 66b55e97..2e4a5b52 100644
--- a/pkg/formats/generic.go
+++ b/pkg/formats/generic.go
@@ -43,7 +43,7 @@ func findClockRate(payloadType uint8, rtpMap string) (int, error) {
 		return 0, fmt.Errorf("invalid rtpmap (%v)", rtpMap)
 	}
 
-	v, err := strconv.ParseInt(tmp[1], 10, 64)
+	v, err := strconv.ParseUint(tmp[1], 10, 31)
 	if err != nil {
 		return 0, err
 	}
diff --git a/pkg/formats/h264.go b/pkg/formats/h264.go
index da8d47c7..9fd78a01 100644
--- a/pkg/formats/h264.go
+++ b/pkg/formats/h264.go
@@ -104,7 +104,7 @@ func (f *H264) unmarshal(payloadType uint8, clock string, codec string, rtpmap s
 			}
 
 		case "packetization-mode":
-			tmp, err := strconv.ParseInt(val, 10, 64)
+			tmp, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid packetization-mode (%v)", val)
 			}
diff --git a/pkg/formats/h265.go b/pkg/formats/h265.go
index 910a32e8..e3d3a63f 100644
--- a/pkg/formats/h265.go
+++ b/pkg/formats/h265.go
@@ -50,7 +50,7 @@ func (f *H265) unmarshal(payloadType uint8, clock string, codec string, rtpmap s
 			}
 
 		case "sprop-max-don-diff":
-			tmp, err := strconv.ParseInt(val, 10, 64)
+			tmp, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid sprop-max-don-diff (%v)", fmtp)
 			}
diff --git a/pkg/formats/lpcm.go b/pkg/formats/lpcm.go
index 5fa3a63c..f342b9e9 100644
--- a/pkg/formats/lpcm.go
+++ b/pkg/formats/lpcm.go
@@ -34,14 +34,14 @@ func (f *LPCM) unmarshal(payloadType uint8, clock string, codec string, rtpmap s
 
 	tmp := strings.SplitN(clock, "/", 2)
 
-	tmp1, err := strconv.ParseInt(tmp[0], 10, 64)
+	tmp1, err := strconv.ParseUint(tmp[0], 10, 31)
 	if err != nil {
 		return err
 	}
 	f.SampleRate = int(tmp1)
 
 	if len(tmp) >= 2 {
-		tmp1, err := strconv.ParseInt(tmp[1], 10, 64)
+		tmp1, err := strconv.ParseUint(tmp[1], 10, 31)
 		if err != nil {
 			return err
 		}
diff --git a/pkg/formats/mpeg4_audio_generic.go b/pkg/formats/mpeg4_audio_generic.go
index bdd36187..dcc62d1a 100644
--- a/pkg/formats/mpeg4_audio_generic.go
+++ b/pkg/formats/mpeg4_audio_generic.go
@@ -45,7 +45,7 @@ func (f *MPEG4AudioGeneric) unmarshal(
 			}
 
 		case "profile-level-id":
-			tmp, err := strconv.ParseInt(val, 10, 64)
+			tmp, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid profile-level-id: %v", val)
 			}
@@ -65,22 +65,22 @@ func (f *MPEG4AudioGeneric) unmarshal(
 			}
 
 		case "sizelength":
-			n, err := strconv.ParseUint(val, 10, 64)
-			if err != nil {
+			n, err := strconv.ParseUint(val, 10, 31)
+			if err != nil || n > 100 {
 				return fmt.Errorf("invalid AAC SizeLength: %v", val)
 			}
 			f.SizeLength = int(n)
 
 		case "indexlength":
-			n, err := strconv.ParseUint(val, 10, 64)
-			if err != nil {
+			n, err := strconv.ParseUint(val, 10, 31)
+			if err != nil || n > 100 {
 				return fmt.Errorf("invalid AAC IndexLength: %v", val)
 			}
 			f.IndexLength = int(n)
 
 		case "indexdeltalength":
-			n, err := strconv.ParseUint(val, 10, 64)
-			if err != nil {
+			n, err := strconv.ParseUint(val, 10, 31)
+			if err != nil || n > 100 {
 				return fmt.Errorf("invalid AAC IndexDeltaLength: %v", val)
 			}
 			f.IndexDeltaLength = int(n)
diff --git a/pkg/formats/mpeg4_audio_latm.go b/pkg/formats/mpeg4_audio_latm.go
index dd9c28d2..5ddfdc18 100644
--- a/pkg/formats/mpeg4_audio_latm.go
+++ b/pkg/formats/mpeg4_audio_latm.go
@@ -30,7 +30,7 @@ func (f *MPEG4AudioLATM) unmarshal(
 	for key, val := range fmtp {
 		switch key {
 		case "profile-level-id":
-			tmp, err := strconv.ParseInt(val, 10, 64)
+			tmp, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid profile-level-id: %v", val)
 			}
@@ -38,7 +38,7 @@ func (f *MPEG4AudioLATM) unmarshal(
 			f.ProfileLevelID = int(tmp)
 
 		case "bitrate":
-			tmp, err := strconv.ParseInt(val, 10, 64)
+			tmp, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid bitrate: %v", val)
 			}
@@ -47,12 +47,7 @@ func (f *MPEG4AudioLATM) unmarshal(
 			f.Bitrate = &v
 
 		case "cpresent":
-			tmp, err := strconv.ParseInt(val, 10, 64)
-			if err != nil {
-				return fmt.Errorf("invalid cpresent: %v", val)
-			}
-
-			v := (tmp == 1)
+			v := (val == "1")
 			f.CPresent = &v
 
 		case "config":
@@ -68,12 +63,7 @@ func (f *MPEG4AudioLATM) unmarshal(
 			}
 
 		case "sbr-enabled":
-			tmp, err := strconv.ParseInt(val, 10, 64)
-			if err != nil {
-				return fmt.Errorf("invalid SBR-enabled: %v", val)
-			}
-
-			v := (tmp == 1)
+			v := (val == "1")
 			f.SBREnabled = &v
 		}
 	}
diff --git a/pkg/formats/mpeg4_video_es.go b/pkg/formats/mpeg4_video_es.go
index bacbf219..f1e65fa6 100644
--- a/pkg/formats/mpeg4_video_es.go
+++ b/pkg/formats/mpeg4_video_es.go
@@ -32,7 +32,7 @@ func (f *MPEG4VideoES) unmarshal(
 	for key, val := range fmtp {
 		switch key {
 		case "profile-level-id":
-			tmp, err := strconv.ParseInt(val, 10, 64)
+			tmp, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid profile-level-id: %v", val)
 			}
diff --git a/pkg/formats/opus.go b/pkg/formats/opus.go
index c7c4f67d..0753ca0b 100644
--- a/pkg/formats/opus.go
+++ b/pkg/formats/opus.go
@@ -25,12 +25,12 @@ func (f *Opus) unmarshal(payloadType uint8, clock string, codec string, rtpmap s
 		return fmt.Errorf("invalid clock (%v)", clock)
 	}
 
-	sampleRate, err := strconv.ParseInt(tmp[0], 10, 64)
+	sampleRate, err := strconv.ParseUint(tmp[0], 10, 31)
 	if err != nil || sampleRate != 48000 {
 		return fmt.Errorf("invalid sample rate: %d", sampleRate)
 	}
 
-	channelCount, err := strconv.ParseInt(tmp[1], 10, 64)
+	channelCount, err := strconv.ParseUint(tmp[1], 10, 31)
 	if err != nil || channelCount != 2 {
 		return fmt.Errorf("invalid channel count: %d", channelCount)
 	}
diff --git a/pkg/formats/vorbis.go b/pkg/formats/vorbis.go
index 6c8a75c0..8287bf68 100644
--- a/pkg/formats/vorbis.go
+++ b/pkg/formats/vorbis.go
@@ -26,13 +26,13 @@ func (f *Vorbis) unmarshal(payloadType uint8, clock string, codec string, rtpmap
 		return fmt.Errorf("invalid clock (%v)", clock)
 	}
 
-	sampleRate, err := strconv.ParseInt(tmp[0], 10, 64)
+	sampleRate, err := strconv.ParseUint(tmp[0], 10, 31)
 	if err != nil {
 		return err
 	}
 	f.SampleRate = int(sampleRate)
 
-	channelCount, err := strconv.ParseInt(tmp[1], 10, 64)
+	channelCount, err := strconv.ParseUint(tmp[1], 10, 31)
 	if err != nil {
 		return err
 	}
diff --git a/pkg/formats/vp8.go b/pkg/formats/vp8.go
index 8a1e6db1..e83a4260 100644
--- a/pkg/formats/vp8.go
+++ b/pkg/formats/vp8.go
@@ -23,7 +23,7 @@ func (f *VP8) unmarshal(payloadType uint8, clock string, codec string, rtpmap st
 	for key, val := range fmtp {
 		switch key {
 		case "max-fr":
-			n, err := strconv.ParseUint(val, 10, 64)
+			n, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid max-fr: %v", val)
 			}
@@ -32,7 +32,7 @@ func (f *VP8) unmarshal(payloadType uint8, clock string, codec string, rtpmap st
 			f.MaxFR = &v2
 
 		case "max-fs":
-			n, err := strconv.ParseUint(val, 10, 64)
+			n, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid max-fs: %v", val)
 			}
diff --git a/pkg/formats/vp9.go b/pkg/formats/vp9.go
index a19d31d3..ac085771 100644
--- a/pkg/formats/vp9.go
+++ b/pkg/formats/vp9.go
@@ -24,7 +24,7 @@ func (f *VP9) unmarshal(payloadType uint8, clock string, codec string, rtpmap st
 	for key, val := range fmtp {
 		switch key {
 		case "max-fr":
-			n, err := strconv.ParseUint(val, 10, 64)
+			n, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid max-fr: %v", val)
 			}
@@ -33,7 +33,7 @@ func (f *VP9) unmarshal(payloadType uint8, clock string, codec string, rtpmap st
 			f.MaxFR = &v2
 
 		case "max-fs":
-			n, err := strconv.ParseUint(val, 10, 64)
+			n, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid max-fs: %v", val)
 			}
@@ -42,7 +42,7 @@ func (f *VP9) unmarshal(payloadType uint8, clock string, codec string, rtpmap st
 			f.MaxFS = &v2
 
 		case "profile-id":
-			n, err := strconv.ParseUint(val, 10, 64)
+			n, err := strconv.ParseUint(val, 10, 31)
 			if err != nil {
 				return fmt.Errorf("invalid profile-id: %v", val)
 			}
diff --git a/pkg/headers/session.go b/pkg/headers/session.go
index 07ef5c18..5a9331a2 100644
--- a/pkg/headers/session.go
+++ b/pkg/headers/session.go
@@ -47,7 +47,7 @@ func (h *Session) Unmarshal(v base.HeaderValue) error {
 
 	for k, v := range kvs {
 		if k == "timeout" {
-			iv, err := strconv.ParseUint(v, 10, 64)
+			iv, err := strconv.ParseUint(v, 10, 32)
 			if err != nil {
 				return err
 			}
diff --git a/pkg/headers/transport.go b/pkg/headers/transport.go
index dcbc8ef6..0b47c0a2 100644
--- a/pkg/headers/transport.go
+++ b/pkg/headers/transport.go
@@ -13,12 +13,12 @@ import (
 func parsePorts(val string) (*[2]int, error) {
 	ports := strings.Split(val, "-")
 	if len(ports) == 2 {
-		port1, err := strconv.ParseInt(ports[0], 10, 64)
+		port1, err := strconv.ParseUint(ports[0], 10, 31)
 		if err != nil {
 			return &[2]int{0, 0}, fmt.Errorf("invalid ports (%v)", val)
 		}
 
-		port2, err := strconv.ParseInt(ports[1], 10, 64)
+		port2, err := strconv.ParseUint(ports[1], 10, 31)
 		if err != nil {
 			return &[2]int{0, 0}, fmt.Errorf("invalid ports (%v)", val)
 		}
@@ -27,7 +27,7 @@ func parsePorts(val string) (*[2]int, error) {
 	}
 
 	if len(ports) == 1 {
-		port1, err := strconv.ParseInt(ports[0], 10, 64)
+		port1, err := strconv.ParseUint(ports[0], 10, 31)
 		if err != nil {
 			return &[2]int{0, 0}, fmt.Errorf("invalid ports (%v)", val)
 		}
@@ -175,7 +175,7 @@ func (h *Transport) Unmarshal(v base.HeaderValue) error {
 			h.InterleavedIDs = ports
 
 		case "ttl":
-			tmp, err := strconv.ParseUint(v, 10, 64)
+			tmp, err := strconv.ParseUint(v, 10, 32)
 			if err != nil {
 				return err
 			}
diff --git a/pkg/media/media.go b/pkg/media/media.go
index 10262957..15197d12 100644
--- a/pkg/media/media.go
+++ b/pkg/media/media.go
@@ -44,7 +44,7 @@ func getFormatAttribute(attributes []psdp.Attribute, payloadType uint8, key stri
 		if attr.Key == key {
 			v := strings.TrimSpace(attr.Value)
 			if parts := strings.SplitN(v, " ", 2); len(parts) == 2 {
-				if tmp, err := strconv.ParseInt(parts[0], 10, 8); err == nil && uint8(tmp) == payloadType {
+				if tmp, err := strconv.ParseUint(parts[0], 10, 8); err == nil && uint8(tmp) == payloadType {
 					return parts[1]
 				}
 			}
@@ -144,7 +144,7 @@ func (m *Media) unmarshal(md *psdp.MediaDescription) error {
 			}
 		}
 
-		tmp, err := strconv.ParseInt(payloadType, 10, 8)
+		tmp, err := strconv.ParseUint(payloadType, 10, 8)
 		if err != nil {
 			return err
 		}
diff --git a/scripts/test.mk b/scripts/test.mk
index 569feda5..5325f074 100644
--- a/scripts/test.mk
+++ b/scripts/test.mk
@@ -1,16 +1,22 @@
+LBITS := $(shell getconf LONG_BIT)
+ifeq ($(LBITS),64)
+RACE=-race
+endif
+
 test-examples:
 	go build -o /dev/null ./examples/...
 
 test-pkg:
-	go test -v -race -coverprofile=coverage-pkg.txt ./pkg/...
+	go test -v $(RACE) -coverprofile=coverage-pkg.txt ./pkg/...
 
 test-root:
-	go test -v -race -coverprofile=coverage-root.txt .
+	go test -v $(RACE) -coverprofile=coverage-root.txt .
 
 test-nodocker: test-examples test-pkg test-root
 
 define DOCKERFILE_TEST
-FROM $(BASE_IMAGE)
+ARG ARCH
+FROM $$ARCH/$(BASE_IMAGE)
 RUN apk add --no-cache make git gcc musl-dev pkgconfig ffmpeg-dev
 WORKDIR /s
 COPY go.mod go.sum ./
@@ -20,8 +26,15 @@ endef
 export DOCKERFILE_TEST
 
 test:
-	echo "$$DOCKERFILE_TEST" | docker build -q . -f - -t temp
+	echo "$$DOCKERFILE_TEST" | docker build -q . -f - -t temp --build-arg ARCH=amd64
 	docker run --rm -it \
 	--name temp \
 	temp \
 	make test-nodocker
+
+test32:
+	echo "$$DOCKERFILE_TEST" | docker build -q . -f - -t temp --build-arg ARCH=i386
+	docker run --rm \
+	--name temp \
+	temp \
+	make test-nodocker
diff --git a/server.go b/server.go
index b206983f..dcdb142d 100644
--- a/server.go
+++ b/server.go
@@ -21,7 +21,7 @@ func extractPort(address string) (int, error) {
 		return 0, err
 	}
 
-	tmp2, err := strconv.ParseInt(tmp, 10, 64)
+	tmp2, err := strconv.ParseUint(tmp, 10, 16)
 	if err != nil {
 		return 0, err
 	}
diff --git a/server_session.go b/server_session.go
index 102ecbfb..a17a1ca4 100644
--- a/server_session.go
+++ b/server_session.go
@@ -70,7 +70,7 @@ func findMediaByTrackID(st *ServerStream, trackID string) *media.Media {
 		return st.medias[0]
 	}
 
-	tmp, err := strconv.ParseInt(trackID, 10, 64)
+	tmp, err := strconv.ParseUint(trackID, 10, 31)
 	if err != nil {
 		return nil
 	}