[Libav-user] Disappearing / missing frames from h264 source
daan.heemskerk at gmail.com
Tue Dec 24 02:32:04 EET 2019
I have a problem that has been driving me crazy for a day.
At this moment I can't post source code; for that I have to write a
small test program tomorrow,
I receive packages from a h268 webcam using:
if( av_read_frame(this->pFormatContextIn, pPacket) < 0 ) break;
Normally those packages have an increasing dts and pts with an increment
Timebase is 1/ 90000 fps is 25 -> So this is perfect.
But at some moments this starts to flip up to the point where the dts
and pts have an increment of 90000 ( one second ).
I repeatedly call the openH264 decoder but only get one frame.
If I look at the video I encode the time is correct; the movie stalls,
skips some frames and continues.
( I use the input pts and that means the input pts is correct. )
The problem is where did the frames go ...
Both AVCONV and VLC MEDIA PLAYER play the same stream with almost no
I tried both:
and the new:
and I have read the source code of avconv.c
If I just copy the packages I also have a correct video stream.
So I miss something at the moment I get the frames using:
avcodec_receive_frame ( repeated )
I don't even mangle with the pts and dts ... I have a movie of a clock;
the pts I receive seems perfect.
The dial sometimes just stops for a while and then jumps over the gap.
Does someone know if there is some setting or some small thing that
would make my frames disappear?
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