Alex,
I was trying the suggested approach and got a crash:
#1 column -> timestamp_ms since beginning of recording
#2 column -> av_rescale_q(timestamp, AVRational{1, 1000}, ost->st->time_base)
where ost->st->time_base = { 1, _fps };
#3 column -> next_pts++ (frame)
325 4992 1
359 5514 2
392 6021 3
421 6467 4
457 7020 5
485 7450 6
523 8033 7
559 8586 8
587 9016 9
626 9615 10
657 10092 11
690 10598 12
724 11121 13
759 11658 14
// CRASH
[mp4 @ 0x7fa647808200] pts (4616192) < dts (4639744) in stream 0
What could possibly be wrong?
Thanks!
Nuno
> On 2 Sep 2021, at 17:05, Nuno Santos <[email protected]> wrote:
>
> Alex,
>
> Thanks for your reply.
>
> 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?
>
> Right now, the pts is being defined as:
>
> ost->frame->pts = ost->next_pts++;
>
> Has per muxing.c example
>
> Regards,
>
> Nuno
>
>> On 2 Sep 2021, at 13:43, Alexandr Kasyan <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Hi, Nuno!
>>
>> Well, one of the possible approaches is -- set the proper pts for AVPacket-s
>> you're muxing.
>> The basic formula is:
>> uint64_t pts = av_rescale_q(timestamp_ms, AVRational{1, 1000}, time_base);
>>
>> 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.
>> You can check if your muxing is played at the wrong speed in the first
>> place, then adjust PTS in code if needed.
>> __________________________________________
>>
>> Regards, Alex
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