[Cin] Report guessed / detected SAR/DAR values

[Andrew Randrianasulu]

вт, 9 янв. 2024 г., 01:25 Andrew Randrianasulu <randrianasulu at gmail.com>:

>
>
> пн, 8 янв. 2024 г., 23:50 Terje J. Hanssen <terjejhanssen at gmail.com>:
>
>>
>>
>> Den 08.01.2024 20:54, skrev Andrea paz:
>> > I created a bd.m2ts file by putting "HDV 1080i/25" as the preset.
>>
>> I think there possibly is a fault in the "HDV 1080i/25" preset (mixed
>> with the (FHD) "1080i/25 preset" as mentioned in another post today:
>> https://lists.cinelerra-gg.org/pipermail/cin/2024-January/007628.html
>>
>> > Bd-render worked until the renderig was complete then CinGG shut down
>> > (I don't have a BD-burner). Doing ffprobe on this video I get:
>> >
>> > Input #0, mpegts, from 'bd.m2ts':
>> >    Duration: 00:01:06.91, start: 0.074667, bitrate: 10242 kb/s
>> >    Program 1
>> >    Stream #0:0[0x1011]: Video: h264 (High) ([27][0][0][0] / 0x001B),
>> > yuv420p(tv, bt709, top first), 1440x1080 [SAR 1:1 DAR 4:3], 25 fps, 25
>> > tbr, 90k tbn
>> >    Stream #0:1[0x1100](ita): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
>> > stereo, fltp, 192 kb/s
>> >
>> > The video is slightly stretched and reduced to 4:3 from the original
>> > 16:9. By applying the downsample filter and setting H and V to 40 the
>> > pixels become clearly visible and can be seen to be square.(cfr
>> > http://www.g-raffa.eu/Cinelerra/HOWTO/anamorphic.html)
>> >
>> > In postimage, I have uploaded several screenshots showing the
>> > "info--details" of the three original sources that make up the video,
>> > of the bd.m2ts (hdv.jpeg) file, and also of how the "set format" is
>> > automatically set.
>> > [@Andrew, is it possible to put PAR and DAR in the Set Format window
>> > as shown in the image?]
>> >
>> > Note: If I force, in Set Format, the aspect ratio (DAR) to 16:9 I get,
>> > with the downsample filter, rectangular pixels. But the video is no
>> > longer deformed....
>> Yes, I am also curious, because I tried to set the parameters manually
>> and then rendered to webm, but still 4:3 format on stored file icon and
>> displayed in VLC. I got a feeling that manual changing W Rate to 1.3333
>> didn't really work and was changed back to 1.000. Can really Canvas
>> Width/Height, W Rate/H Rate and Aspect Ratio in Set> Format be user
>> defined independently?
>>
>
>
> (display) aspect ratio surely set as part of "profile" see
>
> cinelerra/defaultformats.h
>
> W rate/H rate seems to be purely informational, as in you can  set user
> preset and then manually change dimensions/aspect rate and it will show ..
> not exactly rate as num/den, but more like width multiplier / height
> multiplier. So, you enter NOT 4 and 3 there (it will make cannas 4*1440
> width, 1080 * 3 height!) but 1.3333 and 1.0 to see dimensions go fullHD. or
> set fullhd from dropdown menu and see ratio go to 1.333/1.0 Seems more like
> local calculator, because ratio[] array is local to this code module and
> mainwindow.C does not consult it for SAR - going purely by set display
> aspect ratio and dimensions.
>
>
> I looked at code at cinelerra/setformat.C and I am not sure how it works :)
>
> I will look at screenshots a bit later, now Fennec dog wants out
> (fireworks finally faded away)
>


I also found some recent bugreports about various video software and asoect
ratio

https://github.com/HandBrake/HandBrake/issues/5658

see log, where it says

[20:12:27] WARNING: bitstream PAR 1:1 != container PAR 9:16

so, may be we also should be super verbose and print TWO SAR values if
detected, one from bitstream (codec) and another from container?

See also avidemux question

https://avidemux.org/smif/index.php?topic=19617.0

====
Few video players honor pixel aspect ratio info from codec rather from the
container, [..]
====

and openshot bug

https://github.com/OpenShot/libopenshot/issues/489

auto-closed due to bot?? so not sure if it was fixed or not in openshot.

So, we are not only ones who STILL confused by all this :p


>
>
> .
>> >
>> > The patch seems to work, as "guessed SAR/DAR" and "detected SAR/DAR"
>> > appear, but only in source1. In source2 (which is a 4k) there are
>> > neither, and in source3 and hdv.jpeg there is only "guessed SAR/DAR".
>> >
>> > The other 3 patches also seem to work since rendering bd.m2ts worked.
>> >
>> > https://postimg.cc/kDNqfpT0
>> > https://postimg.cc/SJyq5f5J
>> > https://postimg.cc/VdD1cbQ4
>> > https://postimg.cc/ctWZdRLk
>> > https://postimg.cc/tnzbJs1q
>>
>>
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