Den 14.01.2024 21:42, skrev Andrew Randrianasulu:
On Sun, Jan 14, 2024 at 11:14 PM Terje J. Hanssen
<[email protected]> wrote:
Den 14.01.2024 18:41, skrev Andrew Randrianasulu:
вс, 14 янв. 2024 г., 19:51 Terje J. Hanssen <[email protected]>:
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 <[email protected]>:
сб, 13 янв. 2024 г., 03:26 Terje J. Hanssen via Cin
<[email protected]>:
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.
I think only DVD/BD render adds scaling automatically on size mismatch ...
so, for proper downscaling you need to apply it manually.
Learning by failing :)
DVD Render Format autoscales the input HDV format to fit the selected
16x9 DVD output format.
When input format and output rendering formats are identical, it seems
that nothing needs to be set/edited manually in Set Format.
Then the unavoidable request/suggestion:
Could correspondingly different I/O format via selected Presets also
bake in Autoscale as default (beside color space mentioned before) ?
(refer to the: -vf scale=720:576,setsar=64/45,setdar=16/9 in the ffmpeg
line below)
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
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