[linux-dvb] Re: Problem converting TS to PS with replex

[Dave Chapman <dave@dchapman.com>]

Cameron McCormack wrote:
> Hi.
>
> I have an MPEG2 TS from my budget DVB-T card and I want to convert to an
> MPEG2 PS file.  However I try to do it, though, the audio is out of sync
> with the video.  I tried running
>
>   ./replex -t MPEG2 -o /data/test.mpg -a 720 -v 519 /data/test.ts
>
> and I got lots of "video [PD]TS inconsistent" messages.  I tried with -k
> and with -r.  All three of these commands gave me a video with the audio
> out of sync in a different way.
I have also found similar errors (PTS/DTS inconstent) with certain 
transport streams and replex.

A solution which seems to work well in these cases is to use the "-z" 
option of replex to demux the TS (this produces elementary streams - 
i.e. the PTS and DTS values are discarded), and then use the mplex from 
mjpegtools to multiplex to a DVD compliant program stream (-f 8 option 
in mplex).  This will only work if there are no errors in your recording.

You need to calculate the audio offset (VPTS-APTS) displayed in the 
output from replex and pass it to mplex using the -O option.

Regards,

Dave.


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