<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Alex,<div class=""><br class=""></div><div class="">I was trying the suggested approach and got a crash:</div><div class=""><br class=""></div><div class=""><div class="">#1 column -> timestamp_ms since beginning of recording</div><div class="">#2 column -> av_rescale_q(timestamp, AVRational{1, 1000}, ost->st->time_base) where ost->st->time_base = { 1, _fps }; </div><div class="">#3 column -> next_pts++ (frame)</div><div class=""><br class=""></div><div class="">325 4992 1</div><div class="">359 5514 2</div><div class="">392 6021 3</div><div class="">421 6467 4</div><div class="">457 7020 5</div><div class="">485 7450 6</div><div class="">523 8033 7</div><div class="">559 8586 8</div><div class="">587 9016 9</div><div class="">626 9615 10</div><div class="">657 10092 11</div><div class="">690 10598 12</div><div class="">724 11121 13</div><div class="">759 11658 14</div><div class=""><br class=""></div><div class="">// CRASH</div><div class="">[mp4 @ 0x7fa647808200] pts (4616192) < dts (4639744) in stream 0</div><div class=""><br class=""></div><div class="">What could possibly be wrong?</div><div class=""><br class=""></div><div class="">Thanks!</div><div class=""><br class=""></div><div class="">Nuno</div><div><br class=""><blockquote type="cite" class=""><div class="">On 2 Sep 2021, at 17:05, Nuno Santos <<a href="mailto:nuno.santos@imaginando.pt" class="">nuno.santos@imaginando.pt</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=us-ascii" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Alex,<div class=""><br class=""></div><div class="">Thanks for your reply.</div><div class=""><br class=""></div><div class="">This means that if I have a recording elapsed timer, I could pass the timestamp at the current recording time to make this? Or do you seen any other better way of doing it?</div><div class=""><br class=""></div><div class="">Right now, the pts is being defined as:</div><div class=""><br class=""></div><div class="">
<pre style="margin-top: 0px; margin-bottom: 0px;" class=""><!--StartFragment-->ost->frame->pts<span style="color: rgb(79, 79, 79);" class=""> </span><span style="color: rgb(106, 106, 106);" class="">=</span><span style="color: rgb(79, 79, 79);" class=""> </span>ost->next_pts<span style="color: rgb(106, 106, 106);" class="">++</span>;<!--EndFragment--></pre><div class=""><br class=""></div></div><div class="">Has per muxing.c example</div><div class=""><br class=""></div><div class="">Regards,</div><div class=""><br class=""></div><div class="">Nuno</div><div class=""><div class=""><br class=""><blockquote type="cite" class=""><div class="">On 2 Sep 2021, at 13:43, Alexandr Kasyan <<a href="mailto:a.kasyan@ntechlab.com" class="">a.kasyan@ntechlab.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div dir="ltr" class="">Hi, Nuno!<br class=""><br class="">Well, one of the possible approaches is -- set the proper pts for AVPacket-s you're muxing. <br class="">The basic formula is: <br class="">uint64_t pts = av_rescale_q(timestamp_ms, AVRational{1, 1000}, time_base);</div><div dir="ltr" class=""><br class=""></div><div dir="ltr" class="">It's usually time or PTS that's specified for packets (and frame's time is usually derived from that), so most of the players take that into account when feeding frames for display. <br class="">You can check if your muxing is played at the wrong speed in the first place, then adjust PTS in code if needed.<br clear="all" class=""><div class=""><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class="">__________________________________________</div><div dir="ltr" class=""><br class=""></div><div dir="ltr" class="">Regards, Alex</div></div></div></div></div></div></div>
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