<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><br class=""></div>Carl, thanks a million for the answer,<div class=""><br class=""></div><div class=""><br class=""></div><div class="">(1) Ahh, fascinating. So it could be that </div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>i. ffmpeg is in fact using VideoToolbox</div><div class=""><br class=""></div><div class="">BUT</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>ii. VideoToolbox is using software decoding !!!!!!!!!!!<br class=""><div><br class=""></div><div>Good grief! I did not think of that!</div><div><br class=""></div><div><br class=""></div><div>Let me ask,</div><div><br class=""></div><div><b class="">(Q1) Is there a way to absolutely know if Ffmpeg is using VideoToolbox?</b></div><div><br class=""></div><div><br class=""></div><div>It seems that</div><div><br class=""></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>A- sometimes ffmpeg decodes itself in software</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>B- sometimes ffmpeg uses VideoToolbox</div><div><br class=""></div><div>the first problem we face is whether A or B is happening.</div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div>For example, would there be a way to simply turn off “A”</div><div><br class=""></div><div>so that it will either use VideoToolbox, or just fail ?</div><div><br class=""></div><div>This would drastically help by removing one variable.</div><div><br class=""></div><div><br class=""></div><div>How to know if ffmpeg used VideoToolbox?</div><div><br class=""></div><div><br class=""></div><div>Thanks again .. really …</div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""></div><div><br class=""><blockquote type="cite" class=""><div class="">On Jan 24, 2019, at 7:37 AM, Carl Eugen Hoyos <<a href="mailto:ceffmpeg@gmail.com" class="">ceffmpeg@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">2019-01-24 14:20 GMT+01:00, JP May <<a href="mailto:jpm@smhk.com" class="">jpm@smhk.com</a>>:<br class=""><br class=""><blockquote type="cite" class="">My question is simply: How do you ABSOLUTELY KNOW<br class="">whether hardware or software decoding was used?<br class=""></blockquote><br class="">I don't think so as VideoToolbox does software decoding at least<br class="">theoretically.<br class=""><br class="">Carl Eugen</div></div></blockquote><br class=""></div><div><br class=""></div><br class=""></div></body></html>