[Cin] Anamorphic 16:9 SD-DV(D) widescreen to AV1.webm
Terje J. Hanssen
terjejhanssen at gmail.com
Sun Jan 14 21:14:16 CET 2024
Den 14.01.2024 18:41, skrev Andrew Randrianasulu:
>
>
> вс, 14 янв. 2024 г., 19:51 Terje J. Hanssen <terjejhanssen at gmail.com>:
>
>
>
> 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.
>
>
> 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?
>
Yes, I loaded the anamorphic 16:9 HDV 1440x1080 clip and then rendered
it using Set Format Preset PAL 576i (16:9)-DV(D) - without any scaling
on top.
According to my understanding this should down-convert the full source
image to DVD 16:9 anamorphic format, which at playback should display
upscaled 16:9 screen.
That is, just as in my first post
4 b) FFmpeg transcode HDV to DV-wide
ffmpeg -hide_banner -i hdv07_05.m2t -vf
scale=720:576,setsar=64/45,setdar=16/9 -c:v dvvideo -c:a pcm_s16le
dv07_05_wide.dv
Gnome File properties and VLC Tools Codec info just say1440x1080
resolution for the HDV source and 720x576 for the CinGG rendered avi and
dv output.
I don't know if it possible to find out exactly, but
Visually I espect and will estimate that the "middle part" 720x576 px
symmetrical around the center of the source image is kept. That is
cropped away
* horizontally at each side: (1440-720)/2 = 360 px
* vertically top and bottom: (1080-576)/2 = 252 px
>
>> 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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