negative DTS delays

[Nicolas Dufresne]

Le 2015-02-19 21:13, frankw a écrit :
> I think in general I wonder: after such transcoding, is it CBR or VBR
> transport stream being produced? and in terms of PCR, how valid is it being
> generated/inserted into the output stream?
If transcoding (unless you mean transmuxing) it will be VBR or CBR 
depending on how you have configured the encoder.

If you have enabled B-Frame and are using x264enc in 1.4, the PTS/DTS 
delta will always be wrong. The reson is that in 1.4 we offset the DTS 
forward in order to avoid unsupported negative values but we leave the 
PTS untouched. This is very unfortunate behaviour which we are trying to 
fix in current development cycle.

The delta being wrong does not affect Gst (same goes in VLC) as there is 
no synchronization of stream at decoder input. In fact, our decoders 
reorder the frames based on the sequences information found in the 
bitstream. Decoders simply run as fast as possible, and block when 
downstream is full/blocked.

Nicolas