Hi Carl,
Thanks for your assistance! Just to ensure we are on the same page, I had 
(naively?) assumed that everyone in this mailing list was using the libav* 
filters via the C API. Apologies if that is not the case.
Nonetheless, do you suggest I attempt to reproduce the problem using the 
command line?

Best Regards,

      From: Carl Eugen Hoyos <ceffm...@gmail.com>
 To: "This list is about using libavcodec, libavformat, libavutil, libavdevice 
and libavfilter." <libav-user@ffmpeg.org> 
 Sent: Friday, 19 May 2017, 0:42
 Subject: Re: [Libav-user] DV50 to M2V Artefacts (Color Ranges)
2017-05-18 22:45 GMT+02:00 Gavin Smith <gcs584-at-yahoo....@ffmpeg.org>:

> I am decoding the first frame of a DV video (PAL) and then encoding it
> repeatedly back again into M2V wrapped in MpegTS (ignoring audio).
> I notice that the encoded frame has some interesting artefacts which I
> had originally put down to difference in color primaries, but I'm not so
> sure anymore.
> The original clip is available online:
> http://www.gvgdevelopers.com/K2DevGuide/Clips2/PAL_SD_DV50_colorbar.mxf

Sample is (very!) useful, please also provide the command line
that allows you to reproduce the issue together with the
complete, uncut console output.

If the issue is reproducible without using network (ie with an
output file), please use files instead of a network as this will
make reproduce the issue infinitely simpler,

And please simplify the command line as much as possible
(but with setting a small quantizer).

Carl Eugen
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