[FFmpeg-user] tinterlace broken - SAR & DAR wrong

[Paul B Mahol]

On Sun, Jan 3, 2021 at 9:25 PM Mark Filipak (ffmpeg) <markfilipak at bog.us>
wrote:

> On 01/03/2021 10:24 AM, Paul B Mahol wrote:
> > On Sun, Jan 3, 2021 at 11:45 AM Mark Filipak (ffmpeg) <
> markfilipak at bog.us>
> > wrote:
> >
> >> Version N-100546-g2c6f532e0a (latest git build)
> >>
> >> Summary of the bug:
> >> tinterlace works but sets SAR & DAR to bogus values.
> >>
> >> The package is here:
> >> https://www.dropbox.com/t/0WABzvetTF1eT7E4
> >>
> >> Everything needed to reproduce and source video and my result and log
> are
> >> in the package.
> >>
> >>
> > The change of sar is intended behavior.
>
> Okay.
> Given this:
> ffmpeg -report -i source.mkv -vf "tinterlace=mode=merge" -c:a copy -c:s
> copy -dn tinterlace.mkv
> where source.mpv is this:
> "Input #0, matroska,webm, from 'source.mkv':
> "  Metadata:
> "    ENCODER         : Lavf58.65.100
> "  Duration: 00:00:01.00, start: 0.000000, bitrate: 857 kb/s
> "    Stream #0:0, 4, 1/1000: Video: h264 (High), yuv420p(tv, smpte170m,
> progressive), 720x240 [SAR
> 8:9 DAR 8:3], 59.94 fps, 59.94 tbr, 1k tbn, 119.88 tbc (default)"
>
> tinterlace.mkv should be this: 720x480 [SAR 8:9 DAR 4:3]
> but instead is this:
> "Output #0, matroska, to 'tinterlace.mkv':
> "  Metadata:
> "    encoder         : Lavf58.65.100
> "    Stream #0:0, 0, 1/1000: Video: h264 (H264 / 0x34363248), yuv420p(tv,
> smpte170m, top coded first
> (swapped)), 720x480 [SAR 16:9 DAR 8:3], q=2-31, 29.97 fps, 1k tbn
> (default)"
>
> The discrepancy appears to be causing problems with succeeding filters:
> "[Parsed_interleave_7 @ 00000170340dc000] Parameters for input link input1
> (size 720x480, SAR 16:9)
> do not match the corresponding output link parameters (720x240, SAR 8:9)
> "[Parsed_interleave_7 @ 00000170340dc000] Failed to configure output pad
> on Parsed_interleave_7
> "Error reinitializing filters!
> "Failed to inject frame into filter network: Invalid argument
> "Error while processing the decoded data for stream #0:0
> "Conversion failed!"
>
> The succeeding filters are shuffleframes, split, select, tinterlace,
> bwdif, decimate, interleave,
> tinterlace, and bwdif. The problem appears to be provoked by interleave.
>

What's wrong with using setsar filter after tinterlace?


>
> I promise to follow this message with the full command line and full
> report if you promise not to
> ask me why I'm doing such seemingly crazy processing.  :-)
>
> Honestly, I'm not trying to be coy. I'm simply trying to keep this
> use-case simple and prevent this
> thread from getting off topic. The problem appears to be with tinterlace's
> SAR.
>
> Regards,
> Mark.
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