On 28/05/2025 19.18, Alex Xu wrote:
Anyways, I tried:
ffmpeg -i detelecine_input.mkv -vf
"fieldmatch,decimate,drawtext=fontfile=Arial.ttf: text='%{frame_num}':
start_number=0: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20:
box=1: boxcolor=white: boxborderw=5" -c:v libx264 -crf 18 -c:a aac -b:a
192k -pix_fmt yuv420p fieldmatch_decimate_only_no_r.mkv
the issue of duplicated frames 174+175 and skipped 173.
So, frame 173 was dropped, and frame 174 was repeated. I think that may have resulted
from "-crf 18".
In case you missed it, my test file was in the first message of the chain.
And using the detelecine filter got me the right result (with wrong params?)
Yes, the 'detelecine' filter will give you correct results for video that's been statically and
correctly telecined: no variations, clean joins of the VOBs, if applicable. But
'fieldmatch'+'decimate' can be configured exactly that way. In contrast 'fieldmatch' is a lot smarter.
I hope you don't mind that I reformatted your commands.
for i in 0 1 2 3 4; do
for j in 23 2332; do
ffmpeg^
-i detelecine_input.mkv^
-c:v libx264^
-crf 18^ <== trouble?
-c:a aac^
-b:a 192k^ <== why?
-pix_fmt yuv420p^ <== unnecessary
-vf^
"detelecine=start_frame=$i:pattern=$j"
$i$j.mkv;
done
done
I see what you're doing. By the way, which $i$j.mkv was the best?
Your latest:
set _DETELECINE_=fieldmatch,decimate
set _SHOW_N_=drawtext=fontfile=Arial.ttf^
:text='%{frame_num}'^
:start_number=0^
:x=(w-tw)/2:y=h-(2*lh)^
:fontcolor=black:fontsize=20^
:box=1:boxcolor=white:boxborderw=5
ffmpeg^
-i detelecine_input.mkv^
-vf^
"%_DETELECINE_%,%_SHOW_N_%"^
-c:v libx264^
-crf 18^ <== trouble?
-c:a aac^
-b:a 192k^ <== why?
-pix_fmt yuv420p^ <== unnecessary
fieldmatch_decimate_only_no_r.mkv
By the way, I send about 30 options directly to x264 via '-x264-params', none of which is 'crf'. My
videos are the highest quality and the smallest files ever.
_______________________________________________
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-user
To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
