[Libav-user] DV50 to M2V Artefacts (Color Ranges)

[Gavin Smith]

Carl, I think you have given me something to go on.
I tried both:
ffmpeg -i file.mxf -vcodec libx264 -b:v 1200k ./output.tsffmpeg -i file.mxf -vcodec mpeg2ideo -b:v 1200k ./output.ts

...and the transcoded clip was fine. I didn't need to lower the default quantizer.  I'll try write a sample application to try uncover my problem.


Gavin.
      From: Gavin Smith <gcs584-at-yahoo.com at ffmpeg.org>
 To: "This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter." <libav-user at ffmpeg.org> 
 Sent: Friday, 19 May 2017, 9:33
 Subject: Re: [Libav-user] DV50 to M2V Artefacts (Color Ranges)
   
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,
Gavin.

      From: Carl Eugen Hoyos <ceffmpeg at gmail.com>
 To: "This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter." <libav-user at 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.com at 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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