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

[Paul B Mahol]

On Sun, Jan 3, 2021 at 9:28 PM Paul B Mahol <onemda at gmail.com> wrote:

>
>
> 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?
>

Also you can use weave filter as alternative to tinterlace=merge


>
>>
>> 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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>
>