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I can confirm that TL19 mptopdf does not work as it use to do</div>
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Below is an MWE</div>
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I tested with TL18 and there I get numbered PDFs. However mptopdf is version 1.4.1 in both. However I diffed TL19 version against TL18 version. They are not the same<br>
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<span>beginfig(1);<br>
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<div> draw fullcircle scaled 2cm;<br>
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<div>endfig;<br>
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<div>beginfig(2);<br>
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<div> draw fullcircle scaled 2cm;<br>
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<div>endfig;<br>
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<div>end;<br>
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<span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; line-height:normal; color:rgb(0,0,0)">/Lars Madsen</span><br>
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; line-height:normal; color:rgb(0,0,0)">Institut for Matematik / Department of Mathematics</span><br>
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; line-height:normal; color:rgb(0,0,0)">Aarhus Universitet / Aarhus University</span><br>
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; line-height:normal; color:rgb(0,0,0)">Mere info:
</span><a href="http://au.dk/daleif@imf" tabindex="0"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; line-height:normal; color:rgb(0,0,0)">http://au.dk/daleif@math</span></a><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; line-height:normal; color:rgb(0,0,0)">
/ More information: </span><a target="_blank" href="http://au.dk/en/daleif@imf" tabindex="0"><span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; line-height:normal; color:rgb(0,0,0)">http://au.dk/en/daleif@math</span></a><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> tex-live <tex-live-bounces+daleif=imf.au.dk@tug.org> on behalf of Byung-Jae Kwak <byung.kwak@gmail.com><br>
<b>Sent:</b> 12 December 2019 06:37<br>
<b>To:</b> tex-live@tug.org <tex-live@tug.org><br>
<b>Subject:</b> mptopdf output file not numbered.</font>
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<div>System: Windows 10, Tex Live 2019</div>
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<div>I am using mpost and mptopdf to create PDF drawings.</div>
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<div>For example,</div>
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<div>> vim <a href="http://my_figure.mp">my_figure.mp</a></div>
<div>(create figures)</div>
<div>> mpost <a href="http://my_figure.mp">my_figure.mp</a></div>
<div>This is MetaPost, version 2.0 (Tex Live 2019/W32Tex)</div>
<div>...</div>
<div>20 output files written to: my_figure.1 .. my_figure.20<br>
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<div>Transcript written on my_figure.log.</div>
<div>> mptopdf my_figure.*</div>
<div>(lots of output messages)</div>
<div>MPtoPDF 1.4.1 : my_figure.* is converted to my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf
+ my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf + my_figure.pdf
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<div>As you can see, instead of generating my_figure-1.pdf ... my_figure-20.pdf, all the converted files are written to my_figure.pdf, overwriting the previous figures.</div>
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<div>I have not had this problem before with earlier versions of TeX Live.</div>
<div>Has the behavior of mptopdf changed recently, or is there something wrong with my installation of TeX Live 2019?</div>
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<div>BJ<br>
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