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<p class="MsoNormal"><span lang="EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> I used gdigrab to grab desktop. I set the framerate to 30, but, actually, the framerate was only 15 in my test. Why?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> Here is the options of my desktop:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <img width="516" height="319" id="_x56fe__x7247__x0020_3" src="cid:image001.png@01D24692.EAF99380"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> Here is my code:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> ……<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left;text-autospace:none"><span lang="EN-US">
</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:yellow;mso-highlight:yellow">av_dict_set(&options,</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:#A31515;background:yellow;mso-highlight:yellow">"framerate"</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:yellow;mso-highlight:yellow">,</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:#A31515;background:yellow;mso-highlight:yellow">"30"</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:yellow;mso-highlight:yellow">,0);</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white"><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left;text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white">
</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:#2B91AF;background:white;mso-highlight:white">AVInputFormat</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white"> *ifmt
= av_find_input_format(</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:#A31515;background:white;mso-highlight:white">"gdigrab"</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white">);<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left;text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white">
</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:blue;background:white;mso-highlight:white">if</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white"> (avformat_open_input(&fct,
</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:#A31515;background:white;mso-highlight:white">"desktop"</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white">, ifmt,
&options) != 0){<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left;text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white"> printf(</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:#A31515;background:white;mso-highlight:white">"Couldn't
open input stream\n"</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white">);<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left;text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white">
</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:blue;background:white;mso-highlight:white">return</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white"> -1;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black;background:white;mso-highlight:white"> }</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"> ……<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"> while(av_read_frame(vs->in_fct, packet)>=0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"> {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"> icount++;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"> finish = clock();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"> duration = (double)(finish - start) / CLOCKS_PER_SEC;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black">
</span><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:red">printf("%f seconds, count: %d\n", duration, icount);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"> start = clock();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"> av_free_packet(packet);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:NSimSun;color:black"> Here is the result:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><img width="739" height="471" id="_x56fe__x7247__x0020_1" src="cid:image002.png@01D24692.EAF99380"></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> From the result, we can see, the average time was 60ms to get one picture.
<span style="background:yellow;mso-highlight:yellow">Why was it so slow? Were there any options about it to increase the fps?</span><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> Thank you and look forward for your mail.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best wish<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Jack<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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