[Libav-user] pts < dts error

YIRAN LI mrfun.china at gmail.com
Tue Oct 13 12:36:14 CEST 2015

2015-10-13 21:17 GMT+11:00 Carl Eugen Hoyos <cehoyos at ag.or.at>:

> YIRAN LI <mrfun.china at ...> writes:
> > And does this mean, for any encoders that can
> > generate B frames, I need to do similar
> > pre-processing before calling av_write_frame()?
> No, only for encoders that produce broken pts/dts.
> ​Hi Carl,

​I don't have the source code now so I don't know the bframes
​configuration of the x264encoder.
But from one file I used I see that PTS == DTS. Could this be produced by
an encoder configure with non-zero max bframes? If yes, do I still need to
subtract that from PTS even if PTS == DTS?

If the encoder is configured with max b frames == 1,  is it ok to subtract
2 from PTS?


> So if I don't know possible max B frames, then I
> > can't use av_write_frame to correctly mux?
> You set max_bframes when you init the encoder.
> Feel free to subtract 1 from dts as an alternative.
> Carl Eugen
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