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

[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.
>


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
>>
>>
>>
>>
>> --
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>> Cin at lists.cinelerra-gg.org
>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>
>
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