[Cin] Anamorphic 16:9 SD-DV(D) widescreen to AV1.webm

[Andrew Randrianasulu]

вс, 14 янв. 2024 г., 19:51 Terje J. Hanssen <terjejhanssen at gmail.com>:

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> Den 14.01.2024 17:43, skrev Terje J. Hanssen:
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> Den 13.01.2024 18:48, skrev Andrew Randrianasulu:
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> сб, 13 янв. 2024 г., 07:47 Andrew Randrianasulu <randrianasulu at gmail.com>:
>
>>
>>
>> сб, 13 янв. 2024 г., 03:26 Terje J. Hanssen via Cin <
>> cin at lists.cinelerra-gg.org>:
>>
>>>
>>>
>>> Den 11.01.2024 23:43, skrev Terje J. Hanssen:
>>>
>>> .......
>>>
>>>
>>> 4 a) Cin-GG
>>> Loaded a PAL 1080i/50 HDV clip
>>> Set Format Preset: PAL 576i (16:9) - DV(D)
>>> File Render File Format: FFmepg - avi   (NB! because plain Raw DV still
>>> causes DAR 4:3)
>>>                      Audio: Preset: avi_pcm_s16.avi
>>>                      Video: Compression: dv_pal.avi
>>>
>>>
>>> For me it looks like the Set Format Preset: PAL 576i (16:9) - DV(D
>>> and/or the File Format: FFmpeg make up the correct DAR 16:9 here, right?
>>>
>>> Because by Selecting the Format: *Raw DV *cause rendering to *DAR 4:3*
>>> as shown below !
>>> This makes me wonder if it is only the FFmepg File formats that
>>> currently is fixed by patches?
>>> May also other non-FFmpeg formats be affected by anamorphic aspect
>>> ratios ?
>>>
>>
>> This is possible! I basically never used non-ffmpeg video encoders! I
>> think we have 3 of them - raw dv, mpeg video and theora video.
>>
>> I'll check each of them.
>>
>
>
> OOPS!
> As already mentioned, CinGG's FFmpeg-avi was saved/displayed 16:9 and the
> Raw DV was saved/displayed 4:3.
> BUT, in addition I discovered now that in both cases the images have been
> cropped around, that is cut off at both sides, top and bottom.
>
>
I wonder how much was cropped?

May be I misread you but you loaded HDV 1440*1080 clip and then rendered it
into ffmpeg DV at 576i WITHOUT any scaling on top?



That is, the 16:9 avi is displayed with correct geometry, while the 4:3 Raw
> DV is displayed stretched vertically.
> The latter get correct geometry if forced aspect 16:9 during VLC playback..
>
> Actually, only my ffmpeg manual encoded DV-wide has got correct DAR 16:9
> and also correct geometry.
>
> And kept the full image (un-cropped).
>
>
> A visual tip is that this is easiest to discover and compare side by side
> using large file thumbnails with (Gnome) Filemanager.
>
>
> in cinelerra/fileogg.C I found this comment:
> =====
>
> if( asset->aspect_ratio > 0 ) {
>                 // Cinelerra uses frame aspect ratio, theora uses pixel
> aspect ratio
>   float pixel_aspect = asset->aspect_ratio / asset->width * asset->height;
>
>  aratio_num = pixel_aspect * 1000000;
>
>   aratio_den = 1000000;
>                   }
>         else {
>
>  aratio_num = 1000000;
>
>  aratio_den = 1000000;
>                   }
> =====
>
> strangely enough filedv seems to contain code to set is16x9 encoder flag
> ... not sure why it fails ....
>
> mpeg video also should honor aspect ratio, but not tested yet.
>
>
>
>
>>
>>>
>>> mediainfo dv07_05_wide_cingg.dv | grep Display
>>>   Display aspect ratio                     : 4:3
>>>
>>> ffprobe -hide_banner dv07_05_wide_cingg.dv
>>> Input #0, dv, from 'dv07_05_wide_cingg.dv':
>>>   Duration: 00:06:58.08, start: 0.000000, bitrate: 28800 kb/s
>>>   Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 4:3],
>>> 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
>>>   Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
>>>
>>>
>>>
>>>
>>> --
>>> Cin mailing list
>>> Cin at lists.cinelerra-gg.org
>>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>>
>>
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>
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