diff --git a/container/mts/encoder.go b/container/mts/encoder.go
index 6c4bb151..e78bd8b8 100644
--- a/container/mts/encoder.go
+++ b/container/mts/encoder.go
@@ -36,8 +36,8 @@ import (
 	"bitbucket.org/ausocean/av/container/mts/meta"
 	"bitbucket.org/ausocean/av/container/mts/pes"
 	"bitbucket.org/ausocean/av/container/mts/psi"
-	"bitbucket.org/ausocean/utils/realtime"
 	"bitbucket.org/ausocean/utils/logger"
+	"bitbucket.org/ausocean/utils/realtime"
 )
 
 // These three constants are used to select between the three different
@@ -110,7 +110,6 @@ var Meta *meta.Data
 // This will help us obtain a realtime for timestamp meta encoding.
 var RealTime = realtime.NewRealTime()
 
-
 // Encoder encapsulates properties of an MPEG-TS generator.
 type Encoder struct {
 	dst io.WriteCloser
@@ -246,7 +245,10 @@ func (e *Encoder) Write(data []byte) (int, error) {
 			pkt.PCR = pcr
 			pusi = false
 		}
-		_, err := e.dst.Write(pkt.Bytes(e.tsSpace[:PacketSize]))
+
+		b := pkt.Bytes(e.tsSpace[:PacketSize])
+		e.log.Debug("writing MTS packet to destination", "size", len(b), "pusi", pusi, "PID", pkt.PID, "PTS", pts, "PCR", pkt.PCR)
+		_, err := e.dst.Write(b)
 		if err != nil {
 			return len(data), err
 		}
diff --git a/device/raspistill/imp_release.go b/device/raspistill/imp_release.go
index 58658e7d..aeeadd01 100644
--- a/device/raspistill/imp_release.go
+++ b/device/raspistill/imp_release.go
@@ -30,10 +30,10 @@ LICENSE
 package raspistill
 
 import (
+	"bufio"
 	"errors"
 	"fmt"
 	"io"
-	"bufio"
 	"os/exec"
 	"strings"
 
@@ -98,7 +98,6 @@ func (r *Raspistill) start() error {
 		return fmt.Errorf("could not pipe command error: %w", err)
 	}
 
-
 	go func() {
 		errScnr := bufio.NewScanner(stderr)
 		for {
@@ -110,13 +109,13 @@ func (r *Raspistill) start() error {
 			}
 
 			if errScnr.Scan() {
-				r.log.Error("error line from raspistill stderr","error",errScnr.Text())
+				r.log.Error("error line from raspistill stderr", "error", errScnr.Text())
 				continue
 			}
 
 			err := errScnr.Err()
 			if err != nil {
-				r.log.Error("error from stderr scan","error",err)
+				r.log.Error("error from stderr scan", "error", err)
 			}
 		}
 	}()
diff --git a/device/raspistill/imp_testing.go b/device/raspistill/imp_testing.go
index 94027e7b..213e6c2b 100644
--- a/device/raspistill/imp_testing.go
+++ b/device/raspistill/imp_testing.go
@@ -31,7 +31,7 @@ package raspistill
 import (
 	"io"
 	"io/ioutil"
-	"path/filepath"
+	"os"
 	"strconv"
 	"sync"
 	"time"
@@ -41,10 +41,11 @@ import (
 
 const (
 	// TODO(Saxon): find nImages programmatically ?
-	nImages = 6
-
-	imgPath = "../../../test/test-data/av/input/jpeg/"
-	jpgExt  = ".jpg"
+	nImages       = 6
+	relImgPath    = "/bitbucket.org/ausocean/test/test-data/av/input/jpeg/"
+	jpgExt        = ".jpg"
+	gopathEnvName = "GOPATH"
+	readWaitDelay = 1 * time.Second
 )
 
 type raspistill struct {
@@ -69,10 +70,11 @@ func new(l config.Logger) raspistill {
 	// We expect the 6 images test images to be named 0.jpg through to 5.jpg.
 	r.log.Debug("loading test JPEG images")
 	for i, _ := range r.images {
-		absPath, err := filepath.Abs(imgPath)
-		path := absPath + "/" + strconv.Itoa(i) + jpgExt
-		r.images[i], err = ioutil.ReadFile(path)
+		imgDir := os.Getenv(gopathEnvName) + relImgPath
+		path := imgDir + strconv.Itoa(i) + jpgExt
 
+		var err error
+		r.images[i], err = ioutil.ReadFile(path)
 		if err != nil {
 			r.log.Fatal("error loading test image", "imageNum", i, "error", err)
 		}
@@ -85,14 +87,17 @@ func new(l config.Logger) raspistill {
 // calls on Raspistill.read will return an error.
 func (r *Raspistill) stop() error {
 	r.log.Debug("stopping test raspistill")
-	r.setRunning(false)
+	if r.running() {
+		r.setRunning(false)
+		close(r.term)
+	}
 	return nil
 }
 
 // start creates and starts the timelapse and duration tickers and sets
 // isRunning flag to true indicating that raspistill is capturing.
 func (r *Raspistill) start() error {
-	r.log.Debug("starting test raspistill")
+	r.log.Debug("starting test implementation raspistill", "duration", r.cfg.TimelapseDuration.String(), "interval", r.cfg.TimelapseInterval.String())
 	r.durTicker = time.NewTicker(r.cfg.TimelapseDuration)
 	r.intvlTicker = time.NewTicker(r.cfg.TimelapseInterval)
 
@@ -130,13 +135,13 @@ func (r *Raspistill) capture() {
 			r.intvlTicker.Reset(r.cfg.TimelapseInterval)
 
 		case <-r.term:
+			r.log.Debug("got termination signal")
 			r.setRunning(false)
 			return
 
 		case t := <-r.durTicker.C:
 			r.log.Debug("got duration tick, timelapse over", "tick", t)
-			r.buf = nil
-			return
+			close(r.term)
 		}
 	}
 }
@@ -147,20 +152,39 @@ func (r *Raspistill) capture() {
 func (r *Raspistill) read(p []byte) (int, error) {
 	r.log.Debug("reading from test raspistill")
 	if !r.running() {
-		return 0, errNotStarted
+		return 0, io.EOF
+	}
+
+	// Waits until there's something in the buffer for reading, unless there's a
+	// termination signal, in which case return io.EOF.
+	for {
+		select {
+		case <-r.term:
+			return 0, io.EOF
+		default:
+		}
+
+		if r.bufLen() != 0 {
+			break
+		}
+		time.Sleep(readWaitDelay)
 	}
 
 	r.mu.Lock()
 	defer r.mu.Unlock()
-	if r.buf == nil {
-		return 0, io.EOF
-	}
 	n := copy(p, r.buf)
 	r.buf = r.buf[n:]
 
 	return n, nil
 }
 
+func (r *Raspistill) bufLen() int {
+	r.mu.Lock()
+	l := len(r.buf)
+	r.mu.Unlock()
+	return l
+}
+
 func (r *Raspistill) setRunning(s bool) {
 	r.mu.Lock()
 	r.isRunning = s
diff --git a/device/raspistill/raspistill.go b/device/raspistill/raspistill.go
index 67213565..5c74553a 100644
--- a/device/raspistill/raspistill.go
+++ b/device/raspistill/raspistill.go
@@ -43,7 +43,7 @@ const pkg = "raspistill: "
 
 // Config field validation bounds.
 const (
-	minTimelapseDuration = 30 * time.Second    // s
+	minTimelapseDuration = 10 * time.Second    // s
 	maxTimelapseDuration = 86400 * time.Second // s = 24 hours
 	minTimelapseInterval = 1 * time.Second     // s
 	maxTimelapseInterval = 86400 * time.Second // s = 24 hours
diff --git a/revid/revid_test.go b/revid/revid_test.go
index b653ff01..194e27c8 100644
--- a/revid/revid_test.go
+++ b/revid/revid_test.go
@@ -50,6 +50,7 @@ func TestRaspistill(t *testing.T) {
 	// Configuration parameters.
 	const (
 		timelapseInterval  = "4"
+		timelapseDuration  = "25"
 		rbStartElementSize = "1000000"
 		input              = "Raspistill"
 		codec              = "JPEG"
@@ -68,12 +69,12 @@ func TestRaspistill(t *testing.T) {
 	// First remove out dir (if exists) to clear contents, then create dir.
 	err := os.RemoveAll(outDir)
 	if err != nil {
-		t.Fatalf("could not remove any prior out directory: %v",err)
+		t.Fatalf("could not remove any prior out directory: %v", err)
 	}
 
 	os.Mkdir(outDir, os.ModePerm)
 	if err != nil {
-		t.Fatalf("could not create new out directory: %v",err)
+		t.Fatalf("could not create new out directory: %v", err)
 	}
 
 	rv, err := New(config.Config{Logger: (*testLogger)(t)}, nil)
@@ -88,6 +89,7 @@ func TestRaspistill(t *testing.T) {
 			config.KeyOutput:             output,
 			config.KeyOutputPath:         outputPath,
 			config.KeyTimelapseInterval:  timelapseInterval,
+			config.KeyTimelapseDuration:  timelapseDuration,
 			config.KeyLogging:            logging,
 			config.KeyRBStartElementSize: rbStartElementSize,
 		},
@@ -150,8 +152,8 @@ func TestRaspistill(t *testing.T) {
 	}
 
 	// Clean up out directory.
-	err := os.RemoveAll(outDir)
+	err = os.RemoveAll(outDir)
 	if err != nil {
-		t.Fatalf("could not clean up out directory: %v",err)
+		t.Fatalf("could not clean up out directory: %v", err)
 	}
 }
diff --git a/revid/senders.go b/revid/senders.go
index 79dfa73b..619e08b9 100644
--- a/revid/senders.go
+++ b/revid/senders.go
@@ -217,6 +217,7 @@ type mtsSender struct {
 
 // newMtsSender returns a new mtsSender.
 func newMTSSender(dst io.WriteCloser, log func(lvl int8, msg string, args ...interface{}), rb *ring.Buffer, clipDur time.Duration) *mtsSender {
+	log(logger.Debug, "setting up mtsSender", "clip duration", int(clipDur))
 	s := &mtsSender{
 		dst:      dst,
 		repairer: mts.NewDiscontinuityRepairer(),
@@ -283,6 +284,7 @@ func (s *mtsSender) Write(d []byte) (int, error) {
 	}
 
 	if s.next != nil {
+		s.log(logger.Debug, "appending packet to clip")
 		s.buf = append(s.buf, s.next...)
 	}
 	bytes := make([]byte, len(d))
@@ -290,7 +292,10 @@ func (s *mtsSender) Write(d []byte) (int, error) {
 	s.next = bytes
 	p, _ := mts.PID(bytes)
 	s.curPid = int(p)
-	if time.Now().Sub(s.prev) >= s.clipDur && s.curPid == mts.PatPid && len(s.buf) > 0 {
+	curDur := time.Now().Sub(s.prev)
+	s.log(logger.Debug, "checking send conditions", "curDuration", int(curDur), "sendDur", int(s.clipDur), "curPID", s.curPid, "len", len(s.buf))
+	if curDur >= s.clipDur && s.curPid == mts.PatPid && len(s.buf) > 0 {
+		s.log(logger.Debug, "writing clip to ring buffer for sending", "size", len(s.buf))
 		s.prev = time.Now()
 		n, err := s.ring.Write(s.buf)
 		if err == nil {