diff --git a/NEWS b/NEWS
index 511001e5c..e0f129fae 100644
--- a/NEWS
+++ b/NEWS
@@ -70,11 +70,16 @@ ver 0.24 (not yet released)
 * documentation: switch to sphinx-rtd-theme
 * require Meson 1.0
 
-ver 0.23.17 (not yet released)
+ver 0.23.17 (2025/01/29)
+* protocol
+  - "albumart" tries to send larger chunks if available
+  - explicitly disallow "idle" and "noidle" in command lists
 * storage
   - nfs: require libnfs 4.0 or later
 * database
   - inotify: trigger update after symlink was created
+* decoder
+  - ffmpeg: prefer over sndfile and audiofile for its DTS-WAV support
 * support libfmt 11.1
 
 ver 0.23.16 (2024/12/03)
diff --git a/doc/protocol.rst b/doc/protocol.rst
index 3062549be..7dbe4506c 100644
--- a/doc/protocol.rst
+++ b/doc/protocol.rst
@@ -156,6 +156,9 @@ fails, no more commands are executed and the appropriate
 ``list_OK`` is returned for each
 successful command executed in the command list.
 
+Only synchronous commands can be used in command lists.  Commands that
+suspend execution (``idle`` and ``noidle``) are not allowed.
+
 Ranges
 ======
 
diff --git a/src/client/Process.cxx b/src/client/Process.cxx
index f463fcf1e..fbcd832ff 100644
--- a/src/client/Process.cxx
+++ b/src/client/Process.cxx
@@ -36,6 +36,13 @@ Client::ProcessCommandList(bool list_ok,
 	return CommandResult::OK;
 }
 
+[[gnu::pure]]
+static bool
+IsAsyncCommmand(const char *line) noexcept
+{
+	return StringIsEqual(line, "idle") || StringIsEqual(line, "noidle");
+}
+
 CommandResult
 Client::ProcessLine(char *line) noexcept
 {
@@ -51,6 +58,13 @@ Client::ProcessLine(char *line) noexcept
 		return CommandResult::CLOSE;
 	}
 
+	if (cmd_list.IsActive() && IsAsyncCommmand(line)) {
+		FmtWarning(client_domain,
+			   "[{}] not possible in comand list: \"{}\"",
+			   num, line);
+		return CommandResult::CLOSE;
+	}
+
 	if (StringIsEqual(line, "noidle")) {
 		if (idle_waiting) {
 			/* send empty idle response and leave idle mode */
diff --git a/src/command/FileCommands.cxx b/src/command/FileCommands.cxx
index 96ad2087a..fae16dceb 100644
--- a/src/command/FileCommands.cxx
+++ b/src/command/FileCommands.cxx
@@ -197,7 +197,19 @@ read_stream_art(Response &r, const std::string_view art_directory,
 	if (buffer_size > 0) {
 		std::unique_lock lock{is->mutex};
 		is->Seek(lock, offset);
+
+		const bool was_ready = is->IsReady();
+
 		read_size = is->Read(lock, {buffer.get(), buffer_size});
+
+		if (was_ready && read_size < buffer_size / 2)
+			/* the InputStream was ready before, but we
+			   got only very little data; probably just
+			   some data left in the buffer without doing
+			   any I/O; let's wait for the next low-level
+			   read to complete to get more data for the
+			   client */
+			read_size += is->Read(lock, {buffer.get() + read_size, buffer_size - read_size});
 	}
 
 	r.Fmt("size: {}\n", art_file_size);
diff --git a/src/decoder/DecoderList.cxx b/src/decoder/DecoderList.cxx
index f5b83acb9..d7ddac5fc 100644
--- a/src/decoder/DecoderList.cxx
+++ b/src/decoder/DecoderList.cxx
@@ -57,12 +57,6 @@ constinit const struct DecoderPlugin *const decoder_plugins[] = {
 #ifdef ENABLE_OPUS
 	&opus_decoder_plugin,
 #endif
-#ifdef ENABLE_SNDFILE
-	&sndfile_decoder_plugin,
-#endif
-#ifdef ENABLE_AUDIOFILE
-	&audiofile_decoder_plugin,
-#endif
 #ifdef ENABLE_DSD
 	&dsdiff_decoder_plugin,
 	&dsf_decoder_plugin,
@@ -103,6 +97,19 @@ constinit const struct DecoderPlugin *const decoder_plugins[] = {
 #ifdef ENABLE_FFMPEG
 	&ffmpeg_decoder_plugin,
 #endif
+
+	/* these WAV-decoding plugins are below ffmpeg_decoder_plugin
+	   to give FFmpeg a chance to decode DTS-WAV files which is
+	   technically DTS Coherent Acoustics (DCA) stream wrapped in
+	   fake 16-bit stereo samples; neither libsndfile nor
+	   libaudiofile detect this, but FFmpeg does */
+#ifdef ENABLE_SNDFILE
+	&sndfile_decoder_plugin,
+#endif
+#ifdef ENABLE_AUDIOFILE
+	&audiofile_decoder_plugin,
+#endif
+
 	&pcm_decoder_plugin,
 	nullptr
 };
diff --git a/src/input/AsyncInputStream.cxx b/src/input/AsyncInputStream.cxx
index b6e464be5..7b036d3f8 100644
--- a/src/input/AsyncInputStream.cxx
+++ b/src/input/AsyncInputStream.cxx
@@ -171,9 +171,12 @@ AsyncInputStream::Read(std::unique_lock<Mutex> &lock,
 		Check();
 
 		r = buffer.Read();
-		if (!r.empty() || IsEOF())
+		if (!r.empty())
 			break;
 
+		if (IsEOF())
+			return 0;
+
 		caller_cond.wait(lock);
 	}
 
@@ -181,6 +184,12 @@ AsyncInputStream::Read(std::unique_lock<Mutex> &lock,
 	memcpy(dest.data(), r.data(), nbytes);
 	buffer.Consume(nbytes);
 
+	if (buffer.empty())
+		/* when the buffer becomes empty, reset its head and
+		   tail so the next write can fill the whole buffer
+		   and not just the part after the tail */
+		buffer.Clear();
+
 	offset += (offset_type)nbytes;
 
 	if (paused && buffer.GetSize() < resume_at)
diff --git a/src/input/ThreadInputStream.cxx b/src/input/ThreadInputStream.cxx
index 8487acf41..e72fd17a5 100644
--- a/src/input/ThreadInputStream.cxx
+++ b/src/input/ThreadInputStream.cxx
@@ -169,6 +169,14 @@ ThreadInputStream::Read(std::unique_lock<Mutex> &lock,
 			size_t nbytes = std::min(dest.size(), r.size());
 			memcpy(dest.data(), r.data(), nbytes);
 			buffer.Consume(nbytes);
+
+			if (buffer.empty())
+				/* when the buffer becomes empty,
+				   reset its head and tail so the next
+				   write can fill the whole buffer and
+				   not just the part after the tail */
+				buffer.Clear();
+
 			wake_cond.notify_one();
 			offset += nbytes;
 			return nbytes;