[FFmpeg-user] 55-Telecine, 2020-04-26 Status Report, Part 2

[Paul B Mahol]

On 4/27/20, Mark Filipak <markfilipak.windows+ffmpeg at gmail.com> wrote:
> 55-Telecine for Blu-ray Movies.
>
> 55-Telecine works wonderfully for transcoding M2TS movies (for superior
> display on 60Hz TVs)
> provided that the M2TS streams don't have subtitles and/or are short. I
> reckon that the limitations
> are due to mishandling of subtitle time stamps by the 'interleave' filter --
> I remember reading that
> subtitle packets can span GOPs, and 'interleave' may be assigning bogus PTSs
> to fragments. The issue
> is under investigation (https://trac.ffmpeg.org/ticket/8626 -- the ticket's
> title, "pp=linblenddeint
> failure", is stale and no longer applies). The 'interleave' problem prevents
> me putting 55-telecine
> into general use for Blu-ray movies.
>
> New Information:
>
> As an experiment, to bypass the problem in
> https://trac.ffmpeg.org/ticket/8626, I tested whether
> extracting subtitles separately and then merging them back in would
> replicate the problem or do
> something different. It did something different.
>
> Step 1: Transcode to 2001av.MKV.
> Step 2: Extract subtitles to 2001s.MKV.
> Step 3: Merge 2001s.MKV & 2001av.MKV to 2001.MKV.
> Step 4: Merge 2001s.MKV & 2001av.MKV to 2001.MKVToolNix.MKV via MKVToolNix.
>
> Step 3 did bypass the https://trac.ffmpeg.org/ticket/8626 problem (which I
> will report to the trac
> system). however, it did not entirely succeed. Any suggestions regarding the
> procedure below would
> be very welcome.
>
> Regards,
> Mark.
>
>
> Step 1: Transcode to 2001av.MKV.
> ffmpeg -report -ss 2:57 -analyzeduration 5000000000 -probesize 5000000000 -i
> "G:\BDMV\STREAM\00000.m2ts" -filter_complex
> "telecine=pattern=5,split[A][B],[A]select='not(eq(mod((n+1)\,5)\,3))'[C],[B]select='eq(mod((n+1)\,5)\,3)',pp=linblenddeint[D],[C][D]interleave"
> -map 0 -codec:v libx264 -crf 20 -codec:a copy -codec:a:1 pcm_s16be -sn -dn
> "2001av.MKV"
>
> 1 video stream
> 8 audio streams
> 349 instances of "[mpegts @ 000001e0e4df0080] DTS discontinuity in stream
> xx: packet xxx with DTS
> xxxxxxxx, packet 5 with DTS xxxxxxxx"
>
>
> Step 2: Extract subtitles to 2001s.MKV.
> ffmpeg -report -ss 2:57 -analyzeduration 5000000000 -probesize 5000000000 -i
> "G:\BDMV\STREAM\00000.m2ts" -map 0 -vn -an -codec:s copy -dn "2001s.MKV"
>
> 18 subtitle streams
> 349 instances of "[mpegts @ 000001e0e4df0080] DTS discontinuity in stream
> xx: packet xxx with DTS
> xxxxxxxx, packet 5 with DTS xxxxxxxx"
>
>
> Step 3: Merge 2001s.MKV & 2001av.MKV to 2001.MKV.
> ffmpeg -report -analyzeduration 5000000000 -probesize 5000000000 -i
> 2001av.MKV -i 2001s.MKV -map 0
> -codec:v copy -codec:a copy -map 1:s -codec:s copy 2001.2.MKV
>
> Subtitles lead audio by 1:14.
>
>
> Step 4: Merge 2001s.MKV & 2001av.MKV to 2001.MKVToolNix.MKV via MKVToolNix.
>
> No errors or warnings.
> Subtitles & audio are in sync.
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You are creating 60 fps video by basically blending lines from combed frames.
That is absolutely stupidest thing ever.