[Cin] dvdcreate and filempeg patches

[Andrew Randrianasulu]

пн, 5 июн. 2023 г., 20:18 Terje J. Hanssen <terjejhanssen at gmail.com>:

>
>
> Den 05.06.2023 16:14, skrev Andrew Randrianasulu:
>
>
>
> пн, 5 июн. 2023 г., 15:34 Andrew Randrianasulu <randrianasulu at gmail.com>:
>
>>
>>
>> пн, 5 июн. 2023 г., 15:31 Terje J. Hanssen <terjejhanssen at gmail.com>:
>>
>>>
>>>
>>> Den 04.06.2023 21:58, skrev Andrew Randrianasulu:
>>>
>>>
>>>
>>> вс, 4 июн. 2023 г., 15:07 Terje J. Hanssen <terjejhanssen at gmail.com>:
>>>
>>>>
>>>>
>>>> Den 31.05.2023 07:24, skrev Andrew Randrianasulu via Cin:
>>>> > I ......
>>>> >
>>>> > ===
>>>> >
>>>> > and mpeg2enc line looked like this
>>>> >
>>>> > FileMPEG::open_file: Running
>>>> > /dev/shm/cinelerra/cinelerra-5.1/bin//mpeg2enc -v 0  -b 8000 -q 1 -a 2
>>>> > -F 3 -H -c -I 1 -M 4 -z b -f 8 -g 15 -G 15 -R 0 -o
>>>> > '/dev/shm/tmp/dvd_20230531-081921/dvd.m2v'
>>>> >
>>>> >
>>>>
>>>> Is it possible to get the mpeg2enc command line to test it with a dv
>>>> input file directly outside Cinelerra?
>>>>
>>>
>>> try line like this?
>>>
>>> ffmpeg -i input.dv -f yuv4mpegpipe - \
>>>
>>>  |mpeg2enc {flags and output file as shown }
>>>
>>>
>>>
>>> Yes, this fixed the BFF issue, but still Interlaced and 4:3 format.
>>> Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, bt470bg, bottom
>>> first), 720x576 [SAR 16:15 DAR 4:3], 25 fps, 25 tbr, 1200k tbn
>>>
>>> What I want is to get and try Progressive and 16:9 wide format. By
>>> cropping 720x576 to 720x405, bottom 65 and top 106 (top) preserves the
>>> displayed timestam at bottom.
>>>
>>
>>
>> Then you should try ffmpeg's deinterlacing and cropping before passing it
>> to mpeg2enc.
>>
>
> I tried
> ffmpeg -i dv01.dv -aspect 16:9 -vf crop=iw-0-0:ih-106-65:0:106 -f
> yuv4mpegpipe -
> that resulted in interlaced bff:
> Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, bt470bg, bottom first),
> 720x404 [SAR 101:135 DAR 4:3], 25 fps, 25 tbr, 1200k tbn
>

I think mpeg2enc part of full cmd line need their own tweaks relative to
one you get from cingg, for progressive and aspect ratio corrected output
.....



> In comparision the ffmpeg command line I have used is:
> ffmpeg  -i dv01.dv -f dvd -target pal-dvd -aspect 16:9 -vb 8000k -mbd rd
> -trellis 1 -cmp 0 -subcmp 2 -vf crop=iw-0-0:ih-106-65:0:106
> dvd-wide-dv01.mpg
> which results in progressive and DAR 16:9, but still not so good edge
> quality
>
> Stream #0:0[0x1bf]: Data: dvd_nav_packet
>   Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive),
> 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn
>     Side data:
>       cpb: bitrate max/min/avg: 9000000/0/0 buffer size: 1835008
> vbv_delay: N/A
>   Stream #0:2[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 448 kb/s
> Unsupported codec with id 98312 for input stream 0
>
>
>
>
>
> http://macilatthefront.blogspot.com/2021/05/which-deinterlacing-algorithm-is-best.html?m=1
>
> talks about some algos on ffmpeg I never considered:
>
> Estdif / Bwdif
> TS. bwdif             V->V       Deinterlace the input image.
>  TSC estdif            V->V       Apply Edge Slope Tracing deinterlace.
>
>
>
> Yes, of interest if I knew how to put this into the ffmpeg command line
> above, with reference to the blog:
> *Bwdif (FFMPEG): *
> *Good at reconstructing smooth lines and retaining overall image detail
> with SD content, faster than QTGMC but not as good. *
>
> *QTGMC
> <https://macilatthefront.blogspot.com/2021/01/deinterlacing-with-avisynth-and-qtgmc.html>:
> Best retention of original image detail and handling of edge case
> artifacts, *
>
>
>>
>> Can you clarify even with my patches AND deinterlacing checkbox set in
>> dvd creation window and "use ffmpeg" unchecked you still get interlaced?
>>
>>
>>
> I can do it, when it is included with the next Cin apps.
>
>
>>
>>>
>>> quite amazing ffmpeg in this most basic case still works after nearly 20
>>> years, line stolen (and modified)  from
>>>
>>> https://avva.livejournal.com/1188593.html
>>>
>>>
>>> Creating DVD with typical ffmpeg decoding to raw video piped to mpeg2enc
>>> for encoding has been the usual way as described in the Cin-CV manual
>>> http://cinelerra-cv.wikidot.com/cincv-manual-en:rendering-files#11
>>>
>>> and is also included in Ruh's dvd guid sec. 3.4
>>> https://www.qsl.net/n1gg/linux/video/linuxdvdguide.html#3
>>>
>>> mpeg2enc is said to give some higher quality at high bitrate that ffmpeg.
>>> The drawback is it is slow and audio and to be added and multiplexed
>>>
>>>
>>> For ffmpeg as I said cingg does NOT  use command line ffmpeg, so you
>>> need to modify profile parameters in dvd.dvd file.
>>>
>>>
>>> And preferably also a corresponding ffmpeg command line.
>>>>
>>>> I had already created a .mpg video file, interlaced and bff, and it was
>>>> no better, so I think deinterlaced (progressive) will be best.
>>>>
>>>
>>> your call!
>>>
>>> Happy coding!
>>>
>>>>
>>>>
>>>>
>>>>
>>>
>
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