<div dir="ltr">You need a V4L2 video device to use that encoder. If you haven't already done this, run "ls -l /dev/video*", and make sure there is a video device and you have permission to write to it. If that doesn't help, you should raise the logging level of libav and see if it tells you what went wrong.<div><br></div><div>- Richard</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 8, 2019 at 1:22 PM Adhuran Adhuran via Libav-user <<a href="mailto:libav-user@ffmpeg.org">libav-user@ffmpeg.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">




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Dear All,</div>
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<br>
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I am trying to use ffmpeg source code top encode video streams in linux. I used the code provided in this link
<a href="https://ffmpeg.org/doxygen/3.2/muxing_8c_source.html" id="gmail-m_-3108037064996574237LPlnk871991" target="_blank">https://ffmpeg.org/doxygen/3.2/muxing_8c_source.html</a> to encode videos.</div>
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<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
I got an error, <span>when the code accessed the function ret = <a href="https://ffmpeg.org/doxygen/3.2/group__lavc__core.html#ga11f785a188d7d9df71621001465b0f1d" target="_blank">
avcodec_open2</a>(c, codec, &opt);<br>
</span></div>
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<span><br>
</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<span>[h264_v4l2m2m @ 0x114ac00] Could not find a valid device<br>
</span>
<div>[h264_v4l2m2m @ 0x114ac00] can't configure encoder<br>
</div>
<span></span></div>
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<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
May I know, why I get this error and how I could solve this?</div>
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<br>
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Regards,</div>
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<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
Adhuran.<br>
</div>
</div>

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