[beagleboard] media.ctl configuration error "Unable to start streaming: Broken pipe (32)"

Mon, 04 Aug 2014 02:56:21 -0700 

<hr>

<p>Hi, All. <br>
To grab an image with ov7675/ov7670 sensor, I use media-ctl to configure 
isp pipeline.  <br>
my pipeline configuration:  ov7670 -&gt; CCDC -&gt; preview -&gt; preview 
output,following <a 
href="http://e2e.ti.com/support/dsp/omap_applications_processors/f/447/t/234507.aspx";>“a
 
ov7690 configuration”</a>. <br>
my configuration shell script:</p><div class="se-section-delimiter"></div>

<pre class="prettyprint prettyprinted"><code class="language-bash"><span 
class="com">#!/bin/sh</span><span class="pln">
media</span><span class="pun">-</span><span class="pln">ctl </span><span 
class="pun">-</span><span class="pln">v </span><span 
class="pun">-</span><span class="pln">r
media</span><span class="pun">-</span><span class="pln">ctl </span><span 
class="pun">-</span><span class="pln">v </span><span 
class="pun">-</span><span class="pln">f </span><span class="str">'"ov7670 
2-0021":0 [SBGGR8 320x240], "OMAP3 ISP CCDC":1 [SBGGR8 320x240],"OMAP3 ISP 
preview":1 [UYVY 320x240]'</span><span class="pln">
media</span><span class="pun">-</span><span class="pln">ctl </span><span 
class="pun">-</span><span class="pln">v </span><span 
class="pun">-</span><span class="pln">l </span><span class="str">'"ov7670 
2-0021":0 -&gt; "OMAP3 ISP CCDC":0 [1]'</span><span class="pln">
media</span><span class="pun">-</span><span class="pln">ctl </span><span 
class="pun">-</span><span class="pln">v </span><span 
class="pun">-</span><span class="pln">l </span><span class="str">'"OMAP3 
ISP CCDC":2 -&gt; "OMAP3 ISP preview":0 [1]'</span><span class="pln">
media</span><span class="pun">-</span><span class="pln">ctl </span><span 
class="pun">-</span><span class="pln">v </span><span 
class="pun">-</span><span class="pln">l </span><span class="str">'"OMAP3 
ISP preview":1 -&gt; "OMAP3 ISP preview output":0 [1]'</span></code></pre>

<p>command <strong>“media-ctl -p“‘s</strong> outputing seems ok. </p>

<pre class="prettyprint prettyprinted"><code><span 
class="typ">Opening</span><span class="pln"> media device </span><span 
class="pun">/</span><span class="pln">dev</span><span 
class="pun">/</span><span class="pln">media0
</span><span class="typ">Enumerating</span><span class="pln"> entities
</span><span class="typ">Found</span><span class="pln"> </span><span 
class="lit">16</span><span class="pln"> entities
</span><span class="typ">Enumerating</span><span class="pln"> pads 
</span><span class="kwd">and</span><span class="pln"> links
</span><span class="typ">Media</span><span class="pln"> controller API 
version </span><span class="lit">0.0</span><span class="pun">.</span><span 
class="lit">0</span><span class="pln">

</span><span class="typ">Media</span><span class="pln"> device information
</span><span class="pun">------------------------</span><span class="pln">
driver          omap3isp
model           TI OMAP3 ISP
serial          
bus info        
hw revision     </span><span class="lit">0xf0</span><span class="pln">
driver version  </span><span class="lit">0.0</span><span 
class="pun">.</span><span class="lit">0</span><span class="pln">

</span><span class="typ">Device</span><span class="pln"> topology
</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">1</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
CCP2 </span><span class="pun">(</span><span class="lit">2</span><span 
class="pln"> pads</span><span class="pun">,</span><span class="pln"> 
</span><span class="lit">2</span><span class="pln"> links</span><span 
class="pun">)</span><span class="pln">
            type V4L2 subdev subtype </span><span 
class="typ">Unknown</span><span class="pln">
            device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span 
class="pln">v4l</span><span class="pun">-</span><span class="pln">subdev0
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">SGRBG10 </span><span 
class="lit">4096x4096</span><span class="pun">]</span><span class="pln">
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCP2 input"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
        pad1</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Source</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">SGRBG10 </span><span 
class="lit">4096x4096</span><span class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCDC"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">2</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
CCP2 input </span><span class="pun">(</span><span class="lit">1</span><span 
class="pln"> pad</span><span class="pun">,</span><span class="pln"> 
</span><span class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
            type </span><span class="typ">Node</span><span class="pln"> 
subtype V4L
            device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span class="pln">video0
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Source</span><span class="pln"> 
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCP2"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">3</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
CSI2a </span><span class="pun">(</span><span class="lit">2</span><span 
class="pln"> pads</span><span class="pun">,</span><span class="pln"> 
</span><span class="lit">2</span><span class="pln"> links</span><span 
class="pun">)</span><span class="pln">
            type V4L2 subdev subtype </span><span 
class="typ">Unknown</span><span class="pln">
            device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span 
class="pln">v4l</span><span class="pun">-</span><span class="pln">subdev1
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">SGRBG10 </span><span 
class="lit">4096x4096</span><span class="pun">]</span><span class="pln">
        pad1</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Source</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">SGRBG10 </span><span 
class="lit">4096x4096</span><span class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CSI2a output"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCDC"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">4</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
CSI2a output </span><span class="pun">(</span><span 
class="lit">1</span><span class="pln"> pad</span><span 
class="pun">,</span><span class="pln"> </span><span 
class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
            type </span><span class="typ">Node</span><span class="pln"> 
subtype V4L
            device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span class="pln">video1
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> 
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CSI2a"</span><span 
class="pun">:</span><span class="lit">1</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">5</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
CCDC </span><span class="pun">(</span><span class="lit">3</span><span 
class="pln"> pads</span><span class="pun">,</span><span class="pln"> 
</span><span class="lit">9</span><span class="pln"> links</span><span 
class="pun">)</span><span class="pln">
            type V4L2 subdev subtype </span><span 
class="typ">Unknown</span><span class="pln">
            device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span 
class="pln">v4l</span><span class="pun">-</span><span class="pln">subdev2
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">SBGGR8 </span><span 
class="lit">320x240</span><span class="pun">]</span><span class="pln">
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCP2"</span><span 
class="pun">:</span><span class="lit">1</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CSI2a"</span><span 
class="pun">:</span><span class="lit">1</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"ov7670 2-0021"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">]</span><span class="pln">
        pad1</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Source</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">SBGGR8 </span><span 
class="lit">320x240</span><span class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCDC output"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP resizer"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
        pad2</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Source</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">SBGGR8 </span><span 
class="lit">320x239</span><span class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP preview"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP AEWB"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">,</span><span class="pln">IMMUTABLE</span><span 
class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP AF"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">,</span><span class="pln">IMMUTABLE</span><span 
class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP histogram"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">,</span><span class="pln">IMMUTABLE</span><span 
class="pun">]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">6</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
CCDC output </span><span class="pun">(</span><span 
class="lit">1</span><span class="pln"> pad</span><span 
class="pun">,</span><span class="pln"> </span><span 
class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
            type </span><span class="typ">Node</span><span class="pln"> 
subtype V4L
            device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span class="pln">video2
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> 
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCDC"</span><span 
class="pun">:</span><span class="lit">1</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">7</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
preview </span><span class="pun">(</span><span class="lit">2</span><span 
class="pln"> pads</span><span class="pun">,</span><span class="pln"> 
</span><span class="lit">4</span><span class="pln"> links</span><span 
class="pun">)</span><span class="pln">
            type V4L2 subdev subtype </span><span 
class="typ">Unknown</span><span class="pln">
            device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span 
class="pln">v4l</span><span class="pun">-</span><span class="pln">subdev3
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">SGRBG10 </span><span 
class="lit">320x240</span><span class="pln"> </span><span 
class="pun">(</span><span class="lit">8</span><span 
class="pun">,</span><span class="lit">4</span><span 
class="pun">)/</span><span class="lit">306x232</span><span 
class="pun">]</span><span class="pln">
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCDC"</span><span 
class="pun">:</span><span class="lit">2</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">]</span><span class="pln">
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP preview input"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
        pad1</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Source</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">UYVY </span><span 
class="lit">306x232</span><span class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP preview output"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP resizer"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">8</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
preview input </span><span class="pun">(</span><span 
class="lit">1</span><span class="pln"> pad</span><span 
class="pun">,</span><span class="pln"> </span><span 
class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
            type </span><span class="typ">Node</span><span class="pln"> 
subtype V4L
            device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span class="pln">video3
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Source</span><span class="pln"> 
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP preview"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">9</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
preview output </span><span class="pun">(</span><span 
class="lit">1</span><span class="pln"> pad</span><span 
class="pun">,</span><span class="pln"> </span><span 
class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
            type </span><span class="typ">Node</span><span class="pln"> 
subtype V4L
            device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span class="pln">video4
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> 
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP preview"</span><span 
class="pun">:</span><span class="lit">1</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">10</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
resizer </span><span class="pun">(</span><span class="lit">2</span><span 
class="pln"> pads</span><span class="pun">,</span><span class="pln"> 
</span><span class="lit">4</span><span class="pln"> links</span><span 
class="pun">)</span><span class="pln">
             type V4L2 subdev subtype </span><span 
class="typ">Unknown</span><span class="pln">
             device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span 
class="pln">v4l</span><span class="pun">-</span><span class="pln">subdev4
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">YUYV </span><span 
class="lit">306x232</span><span class="pln"> </span><span 
class="pun">(</span><span class="lit">0</span><span 
class="pun">,</span><span class="lit">0</span><span 
class="pun">)/</span><span class="lit">306x232</span><span 
class="pun">]</span><span class="pln">
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCDC"</span><span 
class="pun">:</span><span class="lit">1</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP preview"</span><span 
class="pun">:</span><span class="lit">1</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP resizer input"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
        pad1</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Source</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">YUYV </span><span 
class="lit">320x240</span><span class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP resizer output"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">
</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">11</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
resizer input </span><span class="pun">(</span><span 
class="lit">1</span><span class="pln"> pad</span><span 
class="pun">,</span><span class="pln"> </span><span 
class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
             type </span><span class="typ">Node</span><span class="pln"> 
subtype V4L
             device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span class="pln">video5
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Source</span><span class="pln"> 
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP resizer"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">12</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
resizer output </span><span class="pun">(</span><span 
class="lit">1</span><span class="pln"> pad</span><span 
class="pun">,</span><span class="pln"> </span><span 
class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
             type </span><span class="typ">Node</span><span class="pln"> 
subtype V4L
             device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span class="pln">video6
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> 
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP resizer"</span><span 
class="pun">:</span><span class="lit">1</span><span class="pln"> 
</span><span class="pun">[]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">13</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
AEWB </span><span class="pun">(</span><span class="lit">1</span><span 
class="pln"> pad</span><span class="pun">,</span><span class="pln"> 
</span><span class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
             type V4L2 subdev subtype </span><span 
class="typ">Unknown</span><span class="pln">
             device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span 
class="pln">v4l</span><span class="pun">-</span><span class="pln">subdev5
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> 
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCDC"</span><span 
class="pun">:</span><span class="lit">2</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">,</span><span class="pln">IMMUTABLE</span><span 
class="pun">]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">14</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
AF </span><span class="pun">(</span><span class="lit">1</span><span 
class="pln"> pad</span><span class="pun">,</span><span class="pln"> 
</span><span class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
             type V4L2 subdev subtype </span><span 
class="typ">Unknown</span><span class="pln">
             device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span 
class="pln">v4l</span><span class="pun">-</span><span class="pln">subdev6
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> 
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCDC"</span><span 
class="pun">:</span><span class="lit">2</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">,</span><span class="pln">IMMUTABLE</span><span 
class="pun">]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">15</span><span class="pun">:</span><span class="pln"> OMAP3 ISP 
histogram </span><span class="pun">(</span><span class="lit">1</span><span 
class="pln"> pad</span><span class="pun">,</span><span class="pln"> 
</span><span class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
             type V4L2 subdev subtype </span><span 
class="typ">Unknown</span><span class="pln">
             device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span 
class="pln">v4l</span><span class="pun">-</span><span class="pln">subdev7
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Sink</span><span class="pln"> 
                </span><span class="pun">&lt;-</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCDC"</span><span 
class="pun">:</span><span class="lit">2</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">,</span><span class="pln">IMMUTABLE</span><span 
class="pun">]</span><span class="pln">

</span><span class="pun">-</span><span class="pln"> entity </span><span 
class="lit">16</span><span class="pun">:</span><span class="pln"> ov7670 
</span><span class="lit">2</span><span class="pun">-</span><span 
class="lit">0021</span><span class="pln"> </span><span 
class="pun">(</span><span class="lit">1</span><span class="pln"> 
pad</span><span class="pun">,</span><span class="pln"> </span><span 
class="lit">1</span><span class="pln"> link</span><span 
class="pun">)</span><span class="pln">
             type V4L2 subdev subtype </span><span 
class="typ">Unknown</span><span class="pln">
             device node name </span><span class="pun">/</span><span 
class="pln">dev</span><span class="pun">/</span><span 
class="pln">v4l</span><span class="pun">-</span><span class="pln">subdev8
        pad0</span><span class="pun">:</span><span class="pln"> 
</span><span class="typ">Source</span><span class="pln"> </span><span 
class="pun">[</span><span class="pln">SBGGR8 </span><span 
class="lit">320x240</span><span class="pun">]</span><span class="pln">
                </span><span class="pun">-&gt;</span><span class="pln"> 
</span><span class="str">"OMAP3 ISP CCDC"</span><span 
class="pun">:</span><span class="lit">0</span><span class="pln"> 
</span><span class="pun">[</span><span class="pln">ENABLED</span><span 
class="pun">]</span></code></pre>

<p>But when grabing picture, yavta report a error “Unable to start 
streaming: Broken pipe (32)”,and exit. I checked error -32 <a 
href="http://linuxtv.org/downloads/v4l-dvb-apis/vidioc-streamon.html";>EPIPE</a>,
 
it means “The driver implements pad-level format configuration and the 
pipeline configuration is invalid”, why?</p>

<pre class="prettyprint prettyprinted"><code><span class="com">#yavta -f 
UYVY -f UYVY -s 306x232 -c=1 --stdout /dev/video4</span><span class="pln">
</span><span class="typ">Device</span><span class="pln"> </span><span 
class="pun">/</span><span class="pln">dev</span><span 
class="pun">/</span><span class="pln">video4 opened</span><span 
class="pun">.</span><span class="pln">
</span><span class="typ">Device</span><span class="pln"> </span><span 
class="str">`OMAP3 ISP preview output' on `</span><span 
class="pln">media</span><span class="str">' is a video capture device.
Video format set: UYVY (59565955) 306x232 (stride 640) buffer size 148480
Video format: UYVY (59565955) 306x232 (stride 640) buffer size 148480
8 buffers requested.
length: 148480 offset: 0
Buffer 0 mapped at address 0x4006a000.
length: 148480 offset: 151552
Buffer 1 mapped at address 0x40291000.
length: 148480 offset: 303104
Buffer 2 mapped at address 0x402c5000.
length: 148480 offset: 454656
Buffer 3 mapped at address 0x403c6000.
length: 148480 offset: 606208
Buffer 4 mapped at address 0x4046b000.
length: 148480 offset: 757760
Buffer 5 mapped at address 0x404ad000.
length: 148480 offset: 909312
Buffer 6 mapped at address 0x404f4000.
length: 148480 offset: 1060864
Buffer 7 mapped at address 0x405eb000.
Unable to start streaming: Broken pipe (32).
8 buffers released.</span></code></pre>

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