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Thanks you for your help!
<div>To change the bit_rate I have to use sw_scale too?<br>
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Le 27 févr. 2019 à 18:49, Michael Armes <<a href="mailto:michael.armes@gmail.com">michael.armes@gmail.com</a>> a écrit :<br>
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<div dir="ltr">You need to scale *each frame* with sws_scale from lib_av (<a href="https://libav.org/documentation/doxygen/master/group__libsws.html#gae531c9754c9205d90ad6800015046d74">https://libav.org/documentation/doxygen/master/group__libsws.html#gae531c9754c9205d90ad6800015046d74</a>).
I suggest you look at the example code linked in the documentation for reference.</div>
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<div dir="ltr" class="gmail_attr">On Wed, Feb 27, 2019 at 9:38 AM ABDALLAH Moussa <<a href="mailto:Moussa.ABDALLAH@nexeya.com">Moussa.ABDALLAH@nexeya.com</a>> wrote:<br>
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<p class="MsoNormal">Hello,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am trying to record a stream video to a output file mkv. I set my camera with the resolution 1280x720 and I would like to change it with ffmpeg on my program how can I do that please ?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I have success to change the framerate but I failed with the resolution or other option like bit_rate :<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="line-height:14.25pt;background:rgb(30,30,30)"><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> ivst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">r_frame_rate</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">.</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">num</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">=</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(181,206,168)">25</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">;<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:14.25pt;background:rgb(30,30,30)"><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> ivst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">r_frame_rate</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">.</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">den</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">=</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(181,206,168)">1</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">;
<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:14.25pt;background:rgb(30,30,30)"><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> ovst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">r_frame_rate</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> =
ivst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">r_frame_rate</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">;<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:14.25pt;background:rgb(30,30,30)"><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> ovst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">avg_frame_rate</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> =
ovst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">r_frame_rate</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">;<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:14.25pt;background:rgb(30,30,30)"><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> ivst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">codec</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">bit_rate</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">
= </span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(181,206,168)">3000000</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">;
<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:14.25pt;background:rgb(30,30,30)"><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> ovst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">codec</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">bit_rate</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">
= </span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(181,206,168)">3000000</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">;<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:14.25pt;background:rgb(30,30,30)"><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> ivst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">codec</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">height</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">
= </span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(181,206,168)">320</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">;<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:14.25pt;background:rgb(30,30,30)"><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> ivst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">codec</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">width</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">
= </span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(181,206,168)">240</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">;<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:14.25pt;background:rgb(30,30,30)"><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> ovst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">codec</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">height</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">
= </span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(181,206,168)">320</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">;<u></u><u></u></span></p>
<p class="MsoNormal" style="line-height:14.25pt;background:rgb(30,30,30)"><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)"> ovst-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">codec</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">-></span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(156,220,254)">width</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">
= </span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(181,206,168)">240</span><span style="font-size:10.5pt;font-family:Consolas;color:rgb(212,212,212)">;<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks you for your help !<u></u><u></u></p>
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