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

[Terje J. Hanssen]

Den 14.01.2024 17:43, skrev Terje J. Hanssen:
>
>
> Den 13.01.2024 18:48, skrev Andrew Randrianasulu:
>>
>>
>> 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.
> 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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