diff --git a/api_level_2/cli/rtsp_fps_test.py b/api_level_2/cli/rtsp_fps_test.py
index d064c8e..5af62b6 100644
--- a/api_level_2/cli/rtsp_fps_test.py
+++ b/api_level_2/cli/rtsp_fps_test.py
@@ -8,8 +8,9 @@
 For the exact format of the .yaml file, please see below
 """
 
-import os, yaml, time
+import os, yaml, time, sys
 from valkka.core import *
+from valkka.api2.logging import setFFmpegLogLevel, setValkkaLogLevel
 """We can express a filterchain as a hierarchical list as well!  (no need for ascii art):
 
 ::
@@ -31,7 +32,7 @@ class Filterchain:
 
     def __init__(self, livethread = None, address = None, 
             slot = 1, interval = 10, sws = None, verbose = False, n_stack = None,
-            affinity = None, n_threads = None, ms_pass = None
+            affinity = None, n_threads = None, ms_pass = None, vaapi = False, tcp = False
             ):
         self.livethread = livethread
         self.interval = int(interval*1000) # sec to msec
@@ -40,6 +41,8 @@ def __init__(self, livethread = None, address = None,
         self.sws = sws # None or tuple: (width, height)
         self.verbose = verbose
         self.n_stack = n_stack # not used
+        self.vaapi = vaapi
+        self.tcp = tcp
 
         # *** DECODE BRANCH ***
         # Create the FPSCountFrameFilter
@@ -76,10 +79,17 @@ def __init__(self, livethread = None, address = None,
         #if self.n_stack is not None:
         #    ffc.n_basic = dic["n_stack_live"]        
     
-        self.avthread = AVThread(
-            "avthread-" + str(self.slot),
-            self.fork2) # feeds the bitmap fork & decoding branch
-            # self.framefifo_ctx)
+        if self.vaapi:
+            print("using vaapi for stream", address)
+            self.avthread = VAAPIThread(
+                "avthread-" + str(self.slot),
+                self.fork2) # feeds the bitmap fork & decoding branch
+                # self.framefifo_ctx)
+        else:
+            self.avthread = AVThread(
+                "avthread-" + str(self.slot),
+                self.fork2) # feeds the bitmap fork & decoding branch
+                # self.framefifo_ctx)
 
         if n_threads:
             print("setting", n_threads,"threads per libav decoder")
@@ -95,7 +105,11 @@ def __init__(self, livethread = None, address = None,
         self.ctx =\
             LiveConnectionContext(LiveConnectionType_rtsp, 
                 self.address, self.slot, self.fork1)
-
+        if self.tcp:
+            print("USING TCP")
+            self.ctx.request_tcp = True
+        else:
+            print("USING UDP")
 
     def __call__(self):
         # start decoding thread
@@ -117,7 +131,7 @@ def waitStop(self):
         self.avthread.waitStopCall()
 
 
-def makeChains():
+def makeChains(yaml_file = "streams.yaml"):
     """Create filterchains based on a yaml file that looks like this:
 
     ::
@@ -129,6 +143,7 @@ def makeChains():
               use: true # optional
               bind: 1 # optional
               ms_pass: 100 # optional (see below)
+              vaapi: true # optional
             - name: that other camera
               address: rtsp://user:passwd@192.168.1.13
               interpolate: [300,300] # optional
@@ -142,6 +157,7 @@ def makeChains():
         bind: 0 # bind livethread to a core # optional
         decoder_threads: 2 # how many libav(ffmpeg) threads per decoder
         ms_pass: 100 # after decoding to YUV, pass each frame only every 100 ms # optional
+        vaapi: true # use vaapi for streams # optional
 
     If the top-level "interpolate" is present, then all YUVs are interpolated into that
     RGB dimensions
@@ -172,13 +188,16 @@ def makeChains():
 
     ..can just use buffers that overflow (& should shut up the overflow warning)
     """
-    with open('streams.yaml','r') as f:
+    with open(yaml_file,'r') as f:
         dic=yaml.safe_load(f)
 
     itp = dic.get("interpolate", None)
-    verbose = False
-    if ("verbose" in dic) and (dic["verbose"]):
-        verbose = True
+    verbose = dic.get("verbose", False)
+    core_verbose = dic.get("core-verbose", False)
+    
+    if core_verbose:
+        setFFmpegLogLevel(3)
+        setValkkaLogLevel(4)
 
     assert "streams" in dic, "needs streams"
     assert "duration" in dic, "needs test duration"
@@ -193,10 +212,11 @@ def makeChains():
         print("binding livethread to", dic["bind"])
         livethread.setAffinity(dic["bind"])
 
-    n_stack_decoder = dic.get("n_stack_decoder", None)
-    # --> not used
+    n_stack_decoder = dic.get("n_stack_decoder", None) #  not used
     n_threads = dic.get("decoder_threads", None)
     ms_pass = dic.get("ms_pass", None)
+    vaapi = dic.get("vaapi", False)
+    tcp = dic.get("tcp", False)
 
     chains = []
     cc = 1
@@ -210,6 +230,8 @@ def makeChains():
 
         bind = stream.get("bind", None)
         ms_pass_ = stream.get("ms_pass", ms_pass)
+        vaapi_ = stream.get("vaapi", vaapi)
+        tcp_ = stream.get("tcp", tcp)
 
         fc = Filterchain(
             livethread = livethread, 
@@ -221,7 +243,9 @@ def makeChains():
             n_stack = n_stack_decoder,
             affinity = bind,
             n_threads = n_threads,
-            ms_pass = ms_pass_
+            ms_pass = ms_pass_,
+            vaapi = vaapi_,
+            tcp = tcp_
         )
         chains.append(fc)
         cc+=1
@@ -231,8 +255,13 @@ def makeChains():
 
     # start live connections and decoders
     print("USING", len(chains), "STREAM(S)")
+    print("all addresses:")
+    for i, chain in enumerate(chains):
+        print(i+1, chain.address)
+    print("")
     for chain in chains:
         chain()
+        # time.sleep(0.1)
 
     print("all cams started, running test for", dic["duration"], "seconds")
     time.sleep(dic["duration"])
@@ -248,6 +277,8 @@ def makeChains():
 
 
 if __name__ == "__main__":
-    from valkka.api2.logging import setFFmpegLogLevel
-    setFFmpegLogLevel(0)
-    makeChains()
+    if len(sys.argv) < 2:
+        makeChains()
+    else:
+        print("using input file", sys.argv[1])
+        makeChains(sys.argv[1])
diff --git a/api_level_2/cli/single_stream_rtsp.py b/api_level_2/cli/single_stream_rtsp.py
index 70ea969..c41b090 100644
--- a/api_level_2/cli/single_stream_rtsp.py
+++ b/api_level_2/cli/single_stream_rtsp.py
@@ -37,8 +37,8 @@ def main():
 
     chain = BasicFilterchain(
         livethread=livethread, openglthread=openglthread, address=address, slot=1,
-        # vaapi = True
-        vaapi = False
+        vaapi = True
+        # vaapi = False
     )
 
     chain.decodingOn()  # tell the decoding thread to start its job
diff --git a/api_level_2/cli/streams.yaml b/api_level_2/cli/streams.yaml
index db11e29..3466d35 100644
--- a/api_level_2/cli/streams.yaml
+++ b/api_level_2/cli/streams.yaml
@@ -1,19 +1,19 @@
 streams:
   - name: mummocamera
-    # address: rtsp://admin:vittuhikki@192.168.1.100
-    address: rtsp://admin:12345@10.0.0.7
+    address: rtsp://admin:123456@10.0.0.4
     use: true
     bind: 1
     ms_pass: 100
   - name: mummocamera
-    # address: rtsp://admin:vittuhikki@192.168.1.100
-    address: rtsp://admin:12345@10.0.0.7
+    address: rtsp://admin:123456@10.0.0.4
     use: false
     bind: 2
 interpolate: [300,300]
 interval: 5
-duration: 20
-verbose: true
+duration: 10
+# verbose: true
+verbose: false
 bind: 0
 decoder_threads: 2
 # ms_pass: 100
+vaapi: true
diff --git a/docs/_build/doctrees/hardware.doctree b/docs/_build/doctrees/hardware.doctree
index 2404f7d..7ed8266 100644
Binary files a/docs/_build/doctrees/hardware.doctree and b/docs/_build/doctrees/hardware.doctree differ
diff --git a/docs/_build/doctrees/requirements.doctree b/docs/_build/doctrees/requirements.doctree
index 4f4938f..5539d5d 100644
Binary files a/docs/_build/doctrees/requirements.doctree and b/docs/_build/doctrees/requirements.doctree differ
diff --git a/docs/_build/html/_sources/hardware.rst.txt b/docs/_build/html/_sources/hardware.rst.txt
index 64d4f87..c0b0f69 100644
--- a/docs/_build/html/_sources/hardware.rst.txt
+++ b/docs/_build/html/_sources/hardware.rst.txt
@@ -56,6 +56,15 @@ Please first read this :ref:`word of warning <gpuaccel>`.
 
 Comes in the basic libValkka installation (and uses ffmpeg/libav infrastructure) - no additional packages needed.
 
+First of all, the user using VAAPI, must belong to the "video" user group:
+
+.. code:: bash
+
+    groups $USER
+    # run the following command if the user does not appear in the video group
+    sudo usermod -a -G video $USER
+    # after that you still need to logout & login
+
 In order to use the VAAPI acceleration, just replace `AVThread` with `VAAPIThread`, i.e. instead of
 
 .. code:: python
@@ -68,6 +77,7 @@ use this:
 
     avthread = VAAPIThread("avthread", target_filter)
 
+
 For more details about VAAPI, you can read `this <https://wiki.archlinux.org/title/Hardware_video_acceleration>`_,
 `this <https://wiki.debian.org/HardwareVideoAcceleration>`_ and `this <https://en.wikipedia.org/wiki/Video_Acceleration_API#Supported_hardware_and_drivers>`_.
 
@@ -92,6 +102,13 @@ If you wish to use VAAPI in a docker environment, you should start docker with
 
 And be sure that the host machine has all required vaapi-related libraries installed (the easiest way: install libValkka on the host as well).
 
+Finally, you can follow the GPU usage in realtime with:
+
+.. code:: bash
+
+    sudo intel_gpu_top
+
+
 *NVidia / CUDA*
 
 Provided as a separate package that installs into the `valkka.nv` namespace and is used like this:
diff --git a/docs/_build/html/_sources/requirements.rst.txt b/docs/_build/html/_sources/requirements.rst.txt
index 32d7f94..69ae203 100644
--- a/docs/_build/html/_sources/requirements.rst.txt
+++ b/docs/_build/html/_sources/requirements.rst.txt
@@ -4,8 +4,15 @@
 Installing
 ==========
 
-Install valkka-core
--------------------
+The debian package includes the core library, its python bindings and some API level 2 python code.  The python part is installed "globally" into */usr/lib/python3/dist-packages/*
+
+.. note:: LibValkka comes precompiled and packaged for a certain ubuntu distribution version. This means that the compilation and it's dependencies assume the default
+          python version of that distribution.  Using custom-installed python versions, anacondas and whatnot might cause dependency problems.
+
+A. Install using PPA
+--------------------
+
+*the preferred way*
 
 For recent ubuntu distributions, the core library binary packages and python bindings are provided by a PPA repository.  Subscribe to the PPA repo (do this only once) with:
 
@@ -20,13 +27,6 @@ Install with:
     sudo apt-get update
     sudo apt-get install valkka
 
-Test the installation with:
-
-::
-
-    curl https://raw.githubusercontent.com/elsampsa/valkka-examples/master/quicktest.py
-    python3 quicktest.py
-
 When you need to update valkka, do:
   
 ::
@@ -34,13 +34,43 @@ When you need to update valkka, do:
     sudo apt-get update
     sudo apt-get install --only-upgrade valkka
 
+
+B. Install using releases
+-------------------------
+
+*if you don't like PPAs*
+
+You can download and install the required .deb packages "manually" from the 
+`releases page <https://github.com/elsampsa/valkka-core/releases>`_
+
+::
+
+    sudo dpkg -i Valkka-*.deb
+    sudo apt-get install -fy 
+
+The last line pulls the dependencies.
+
+Repeat the process when you need to update.
+
+C. Compile yourself
+-------------------
+
+*the last resort*
+
 If you're not using a recent Ubuntu distro and need to build libValkka and it's python bindings yourself, 
 please refer to the `valkka-core github page <https://github.com/elsampsa/valkka-core#compile-yourself>`_.
 
-The debian package includes the core library, its python bindings and some API level 2 python code.  The python part is installed "globally" into */usr/lib/python3/dist-packages/*
 
-.. note:: LibValkka comes precompiled and packaged for a certain ubuntu distribution version. This means that the compilation and it's dependencies assume the default
-          python version of that distribution.  Using custom-installed python versions, anacondas and whatnot might cause dependency problems.
+Test your installation
+----------------------
+
+Test the installation with:
+
+::
+
+    curl https://raw.githubusercontent.com/elsampsa/valkka-examples/master/quicktest.py -o quicktest.py
+    python3 quicktest.py
+
 
 Numpy
 -----
diff --git a/docs/_build/html/hardware.html b/docs/_build/html/hardware.html
index 6db4494..abb9977 100644
--- a/docs/_build/html/hardware.html
+++ b/docs/_build/html/hardware.html
@@ -71,6 +71,13 @@ <h2>Linux clients<a class="headerlink" href="#linux-clients" title="Permalink to
 <p>Please first read this <a class="reference internal" href="decoding.html#gpuaccel"><span class="std std-ref">word of warning</span></a>.</p>
 <p><em>VAAPI</em></p>
 <p>Comes in the basic libValkka installation (and uses ffmpeg/libav infrastructure) - no additional packages needed.</p>
+<p>First of all, the user using VAAPI, must belong to the “video” user group:</p>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>groups <span class="nv">$USER</span>
+<span class="c1"># run the following command if the user does not appear in the video group</span>
+sudo usermod -a -G video <span class="nv">$USER</span>
+<span class="c1"># after that you still need to logout &amp; login</span>
+</pre></div>
+</div>
 <p>In order to use the VAAPI acceleration, just replace <cite>AVThread</cite> with <cite>VAAPIThread</cite>, i.e. instead of</p>
 <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">avthread</span> <span class="o">=</span> <span class="n">AVThread</span><span class="p">(</span><span class="s2">&quot;avthread&quot;</span><span class="p">,</span> <span class="n">target_filter</span><span class="p">)</span>
 </pre></div>
@@ -95,6 +102,10 @@ <h2>Linux clients<a class="headerlink" href="#linux-clients" title="Permalink to
 </pre></div>
 </div>
 <p>And be sure that the host machine has all required vaapi-related libraries installed (the easiest way: install libValkka on the host as well).</p>
+<p>Finally, you can follow the GPU usage in realtime with:</p>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>sudo intel_gpu_top
+</pre></div>
+</div>
 <p><em>NVidia / CUDA</em></p>
 <p>Provided as a separate package that installs into the <cite>valkka.nv</cite> namespace and is used like this:</p>
 <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">valkka.nv</span> <span class="kn">import</span> <span class="n">NVThread</span>
diff --git a/docs/_build/html/index.html b/docs/_build/html/index.html
index c26a404..51118af 100644
--- a/docs/_build/html/index.html
+++ b/docs/_build/html/index.html
@@ -79,7 +79,10 @@ <h1>Valkka<a class="headerlink" href="#valkka" title="Permalink to this headline
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="requirements.html">Installing</a><ul>
-<li class="toctree-l2"><a class="reference internal" href="requirements.html#install-valkka-core">Install valkka-core</a></li>
+<li class="toctree-l2"><a class="reference internal" href="requirements.html#a-install-using-ppa">A. Install using PPA</a></li>
+<li class="toctree-l2"><a class="reference internal" href="requirements.html#b-install-using-releases">B. Install using releases</a></li>
+<li class="toctree-l2"><a class="reference internal" href="requirements.html#c-compile-yourself">C. Compile yourself</a></li>
+<li class="toctree-l2"><a class="reference internal" href="requirements.html#test-your-installation">Test your installation</a></li>
 <li class="toctree-l2"><a class="reference internal" href="requirements.html#numpy">Numpy</a></li>
 <li class="toctree-l2"><a class="reference internal" href="requirements.html#install-the-testsuite">Install the testsuite</a></li>
 <li class="toctree-l2"><a class="reference internal" href="requirements.html#gtk">GTK</a></li>
diff --git a/docs/_build/html/requirements.html b/docs/_build/html/requirements.html
index 886d638..9d9cc7e 100644
--- a/docs/_build/html/requirements.html
+++ b/docs/_build/html/requirements.html
@@ -34,8 +34,15 @@
             
   <div class="section" id="installing">
 <span id="requirements"></span><h1>Installing<a class="headerlink" href="#installing" title="Permalink to this headline">¶</a></h1>
-<div class="section" id="install-valkka-core">
-<h2>Install valkka-core<a class="headerlink" href="#install-valkka-core" title="Permalink to this headline">¶</a></h2>
+<p>The debian package includes the core library, its python bindings and some API level 2 python code.  The python part is installed “globally” into <em>/usr/lib/python3/dist-packages/</em></p>
+<div class="admonition note">
+<p class="admonition-title">Note</p>
+<p>LibValkka comes precompiled and packaged for a certain ubuntu distribution version. This means that the compilation and it’s dependencies assume the default
+python version of that distribution.  Using custom-installed python versions, anacondas and whatnot might cause dependency problems.</p>
+</div>
+<div class="section" id="a-install-using-ppa">
+<h2>A. Install using PPA<a class="headerlink" href="#a-install-using-ppa" title="Permalink to this headline">¶</a></h2>
+<p><em>the preferred way</em></p>
 <p>For recent ubuntu distributions, the core library binary packages and python bindings are provided by a PPA repository.  Subscribe to the PPA repo (do this only once) with:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sudo</span> <span class="n">apt</span><span class="o">-</span><span class="n">add</span><span class="o">-</span><span class="n">repository</span> <span class="n">ppa</span><span class="p">:</span><span class="n">sampsa</span><span class="o">-</span><span class="n">riikonen</span><span class="o">/</span><span class="n">valkka</span>
 </pre></div>
@@ -45,23 +52,36 @@ <h2>Install valkka-core<a class="headerlink" href="#install-valkka-core" title="
 <span class="n">sudo</span> <span class="n">apt</span><span class="o">-</span><span class="n">get</span> <span class="n">install</span> <span class="n">valkka</span>
 </pre></div>
 </div>
-<p>Test the installation with:</p>
-<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">curl</span> <span class="n">https</span><span class="p">:</span><span class="o">//</span><span class="n">raw</span><span class="o">.</span><span class="n">githubusercontent</span><span class="o">.</span><span class="n">com</span><span class="o">/</span><span class="n">elsampsa</span><span class="o">/</span><span class="n">valkka</span><span class="o">-</span><span class="n">examples</span><span class="o">/</span><span class="n">master</span><span class="o">/</span><span class="n">quicktest</span><span class="o">.</span><span class="n">py</span>
-<span class="n">python3</span> <span class="n">quicktest</span><span class="o">.</span><span class="n">py</span>
-</pre></div>
-</div>
 <p>When you need to update valkka, do:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sudo</span> <span class="n">apt</span><span class="o">-</span><span class="n">get</span> <span class="n">update</span>
 <span class="n">sudo</span> <span class="n">apt</span><span class="o">-</span><span class="n">get</span> <span class="n">install</span> <span class="o">--</span><span class="n">only</span><span class="o">-</span><span class="n">upgrade</span> <span class="n">valkka</span>
 </pre></div>
 </div>
+</div>
+<div class="section" id="b-install-using-releases">
+<h2>B. Install using releases<a class="headerlink" href="#b-install-using-releases" title="Permalink to this headline">¶</a></h2>
+<p><em>if you don’t like PPAs</em></p>
+<p>You can download and install the required .deb packages “manually” from the
+<a class="reference external" href="https://github.com/elsampsa/valkka-core/releases">releases page</a></p>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sudo</span> <span class="n">dpkg</span> <span class="o">-</span><span class="n">i</span> <span class="n">Valkka</span><span class="o">-*.</span><span class="n">deb</span>
+<span class="n">sudo</span> <span class="n">apt</span><span class="o">-</span><span class="n">get</span> <span class="n">install</span> <span class="o">-</span><span class="n">fy</span>
+</pre></div>
+</div>
+<p>The last line pulls the dependencies.</p>
+<p>Repeat the process when you need to update.</p>
+</div>
+<div class="section" id="c-compile-yourself">
+<h2>C. Compile yourself<a class="headerlink" href="#c-compile-yourself" title="Permalink to this headline">¶</a></h2>
+<p><em>the last resort</em></p>
 <p>If you’re not using a recent Ubuntu distro and need to build libValkka and it’s python bindings yourself,
 please refer to the <a class="reference external" href="https://github.com/elsampsa/valkka-core#compile-yourself">valkka-core github page</a>.</p>
-<p>The debian package includes the core library, its python bindings and some API level 2 python code.  The python part is installed “globally” into <em>/usr/lib/python3/dist-packages/</em></p>
-<div class="admonition note">
-<p class="admonition-title">Note</p>
-<p>LibValkka comes precompiled and packaged for a certain ubuntu distribution version. This means that the compilation and it’s dependencies assume the default
-python version of that distribution.  Using custom-installed python versions, anacondas and whatnot might cause dependency problems.</p>
+</div>
+<div class="section" id="test-your-installation">
+<h2>Test your installation<a class="headerlink" href="#test-your-installation" title="Permalink to this headline">¶</a></h2>
+<p>Test the installation with:</p>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">curl</span> <span class="n">https</span><span class="p">:</span><span class="o">//</span><span class="n">raw</span><span class="o">.</span><span class="n">githubusercontent</span><span class="o">.</span><span class="n">com</span><span class="o">/</span><span class="n">elsampsa</span><span class="o">/</span><span class="n">valkka</span><span class="o">-</span><span class="n">examples</span><span class="o">/</span><span class="n">master</span><span class="o">/</span><span class="n">quicktest</span><span class="o">.</span><span class="n">py</span> <span class="o">-</span><span class="n">o</span> <span class="n">quicktest</span><span class="o">.</span><span class="n">py</span>
+<span class="n">python3</span> <span class="n">quicktest</span><span class="o">.</span><span class="n">py</span>
+</pre></div>
 </div>
 </div>
 <div class="section" id="numpy">
@@ -176,7 +196,10 @@ <h3><a href="index.html">Table of Contents</a></h3>
 <li class="toctree-l1"><a class="reference internal" href="intro.html">About Valkka</a></li>
 <li class="toctree-l1"><a class="reference internal" href="hardware.html">Supported hardware</a></li>
 <li class="toctree-l1 current"><a class="current reference internal" href="#">Installing</a><ul>
-<li class="toctree-l2"><a class="reference internal" href="#install-valkka-core">Install valkka-core</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#a-install-using-ppa">A. Install using PPA</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#b-install-using-releases">B. Install using releases</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#c-compile-yourself">C. Compile yourself</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#test-your-installation">Test your installation</a></li>
 <li class="toctree-l2"><a class="reference internal" href="#numpy">Numpy</a></li>
 <li class="toctree-l2"><a class="reference internal" href="#install-the-testsuite">Install the testsuite</a></li>
 <li class="toctree-l2"><a class="reference internal" href="#gtk">GTK</a></li>
diff --git a/docs/_build/html/searchindex.js b/docs/_build/html/searchindex.js
index a23552a..f98a102 100644
--- a/docs/_build/html/searchindex.js
+++ b/docs/_build/html/searchindex.js
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\ No newline at end of file
diff --git a/docs/hardware.rst b/docs/hardware.rst
index 64d4f87..c0b0f69 100644
--- a/docs/hardware.rst
+++ b/docs/hardware.rst
@@ -56,6 +56,15 @@ Please first read this :ref:`word of warning <gpuaccel>`.
 
 Comes in the basic libValkka installation (and uses ffmpeg/libav infrastructure) - no additional packages needed.
 
+First of all, the user using VAAPI, must belong to the "video" user group:
+
+.. code:: bash
+
+    groups $USER
+    # run the following command if the user does not appear in the video group
+    sudo usermod -a -G video $USER
+    # after that you still need to logout & login
+
 In order to use the VAAPI acceleration, just replace `AVThread` with `VAAPIThread`, i.e. instead of
 
 .. code:: python
@@ -68,6 +77,7 @@ use this:
 
     avthread = VAAPIThread("avthread", target_filter)
 
+
 For more details about VAAPI, you can read `this <https://wiki.archlinux.org/title/Hardware_video_acceleration>`_,
 `this <https://wiki.debian.org/HardwareVideoAcceleration>`_ and `this <https://en.wikipedia.org/wiki/Video_Acceleration_API#Supported_hardware_and_drivers>`_.
 
@@ -92,6 +102,13 @@ If you wish to use VAAPI in a docker environment, you should start docker with
 
 And be sure that the host machine has all required vaapi-related libraries installed (the easiest way: install libValkka on the host as well).
 
+Finally, you can follow the GPU usage in realtime with:
+
+.. code:: bash
+
+    sudo intel_gpu_top
+
+
 *NVidia / CUDA*
 
 Provided as a separate package that installs into the `valkka.nv` namespace and is used like this:
diff --git a/docs/requirements.rst b/docs/requirements.rst
index 32d7f94..69ae203 100644
--- a/docs/requirements.rst
+++ b/docs/requirements.rst
@@ -4,8 +4,15 @@
 Installing
 ==========
 
-Install valkka-core
--------------------
+The debian package includes the core library, its python bindings and some API level 2 python code.  The python part is installed "globally" into */usr/lib/python3/dist-packages/*
+
+.. note:: LibValkka comes precompiled and packaged for a certain ubuntu distribution version. This means that the compilation and it's dependencies assume the default
+          python version of that distribution.  Using custom-installed python versions, anacondas and whatnot might cause dependency problems.
+
+A. Install using PPA
+--------------------
+
+*the preferred way*
 
 For recent ubuntu distributions, the core library binary packages and python bindings are provided by a PPA repository.  Subscribe to the PPA repo (do this only once) with:
 
@@ -20,13 +27,6 @@ Install with:
     sudo apt-get update
     sudo apt-get install valkka
 
-Test the installation with:
-
-::
-
-    curl https://raw.githubusercontent.com/elsampsa/valkka-examples/master/quicktest.py
-    python3 quicktest.py
-
 When you need to update valkka, do:
   
 ::
@@ -34,13 +34,43 @@ When you need to update valkka, do:
     sudo apt-get update
     sudo apt-get install --only-upgrade valkka
 
+
+B. Install using releases
+-------------------------
+
+*if you don't like PPAs*
+
+You can download and install the required .deb packages "manually" from the 
+`releases page <https://github.com/elsampsa/valkka-core/releases>`_
+
+::
+
+    sudo dpkg -i Valkka-*.deb
+    sudo apt-get install -fy 
+
+The last line pulls the dependencies.
+
+Repeat the process when you need to update.
+
+C. Compile yourself
+-------------------
+
+*the last resort*
+
 If you're not using a recent Ubuntu distro and need to build libValkka and it's python bindings yourself, 
 please refer to the `valkka-core github page <https://github.com/elsampsa/valkka-core#compile-yourself>`_.
 
-The debian package includes the core library, its python bindings and some API level 2 python code.  The python part is installed "globally" into */usr/lib/python3/dist-packages/*
 
-.. note:: LibValkka comes precompiled and packaged for a certain ubuntu distribution version. This means that the compilation and it's dependencies assume the default
-          python version of that distribution.  Using custom-installed python versions, anacondas and whatnot might cause dependency problems.
+Test your installation
+----------------------
+
+Test the installation with:
+
+::
+
+    curl https://raw.githubusercontent.com/elsampsa/valkka-examples/master/quicktest.py -o quicktest.py
+    python3 quicktest.py
+
 
 Numpy
 -----
diff --git a/quicktest.py b/quicktest.py
index 8f581e3..df2d683 100644
--- a/quicktest.py
+++ b/quicktest.py
@@ -1,5 +1,5 @@
 from subprocess import Popen, PIPE
-import os
+import os, sys
 
 print()
 print("Loading Valkka")
@@ -10,7 +10,10 @@
     import valkka
     from valkka import core
 except Exception as e:
-    print("Loading Valkka failed with", e)
+    print("FATAL: Loading Valkka failed with", e)
+    print("       Have you installed libValkka at all?")
+    print()
+    sys.exit(2)
 else:
     valkka_ok = True
     print("Valkka loaded ok")
@@ -23,8 +26,8 @@
     live =core.LiveThread("live")
     # inp  =core.FrameFifo("fifo") # in the API no more
     # ff   =core.FifoFrameFilter("fifo",inp)
-    out  =core.DummyFrameFilter("dummy")
-    av   =core.AVThread("av",out)
+    out_filter  =core.DummyFrameFilter("dummy")
+    av   =core.AVThread("av",out_filter)
     gl   =core.OpenGLThread("gl")
 
     av_in =av.getFrameFilter();
@@ -34,7 +37,7 @@
     ctx.slot=1
     ctx.connection_type=core.LiveConnectionType_rtsp
     ctx.address="rtsp://admin:12345@192.168.0.157"
-    ctx2=core.LiveConnectionContext(core.LiveConnectionType_rtsp, "rtsp://admin:12345@192.168.0.157", 1, out)
+    ctx2=core.LiveConnectionContext(core.LiveConnectionType_rtsp, "rtsp://admin:12345@192.168.0.157", 1, out_filter)
     print("   Valkka classes ok")
     print()
 
@@ -96,13 +99,12 @@
     print("OpenCV loaded ok")
     print("   Version      ",cv2.__version__)
     print("   Loaded from  ",cv2.__file__)
-
-if "/usr/lib/" not in cv2.__file__:
-    print("   WARNING       your opencv is not installed into the standard /usr/lib/ location")
-    print("                 consider using these commands:")
-    print("                 pip3 uninstall opencv-python")
-    print("                 sudo pip3 uninstall opencv-python")
-    print("                 sudo apt-get install python3-opencv")
+    if "/usr/lib/" not in cv2.__file__:
+        print("   WARNING       your opencv is not installed into the standard /usr/lib/ location")
+        print("                 consider using these commands:")
+        print("                 pip3 uninstall opencv-python")
+        print("                 sudo pip3 uninstall opencv-python")
+        print("                 sudo apt-get install python3-opencv")
 
 print()
 print("Loading PySide2")
@@ -151,8 +153,10 @@
 
 try:
     from valkka.core import VAAPIThread
+    avthread=VAAPIThread("decoder", out_filter)
 except Exception as e:
     print("    could not import VAAPIThread from valkka.core")
+    print(e)
 else:
     print("    VAAPI acceleration available: you can use valkka.core.VAAPIThread instead of valkka.core.AVThread")
 
@@ -176,3 +180,28 @@
     else:
         print("    All good")
 print()
+
+
+print("Taking a look at current user's groups")
+p=Popen(f"groups {os.environ['USER']}".split(), stdout=PIPE, stderr=PIPE)
+out, err = p.communicate()
+if p.returncode != 0:
+    print("    WARNING: command groups failed - something is VERY WRONG in your system")
+res = out.decode("utf-8")
+user, groups = res.split(":")
+# print(groups)
+if "video" not in groups:
+    print(f"    WARNING: user not in the 'video' group: VAAPI hw acceleration will not work - please run:")
+    print(f"             sudo usermod -a -G video {os.environ['USER']}")
+    print(f"             after that you still need to logout & login")
+if "render" not in groups:
+    print(f"    WARNING: user not in the 'render' group - consider running:")
+    print(f"             sudo usermod -a -G render {os.environ['USER']}")
+    print(f"             after that you still need to logout & login")
+if "docker" not in groups:
+    print(f"    WARNING: user not in the 'docker' group - if you want to use docker, do:")
+    print(f"             sudo usermod -a -G docker {os.environ['USER']}")
+    print(f"             after that you still need to logout & login")
+print()
+
+