> Thanks! This works, and I agree that it’s better than using the filename:
>
> ffmpeg -pattern_type glob -i '*.jpg' -vf
> "drawtext=text='%{metadata\\:DateTimeOriginal}':
> fontfile=/System/Library/Fonts/Helvetica.ttc:fontcolor=white: fontsize=48:
> x=(w-text_w)*0.01: y=(h-text_h)*0.98" -y CombLapseWithTimeStamp.mp4
>
> I can now add tmix after drawtext:
>
> ffmpeg -pattern_type glob -i '*.jpg' -vf
> "drawtext=text='%{metadata\\:DateTimeOriginal}':
> fontfile=/System/Library/Fonts/Helvetica.ttc:fontcolor=white: fontsize=48:
> x=(w-text_w)*0.01: y=(h-text_h)*0.98, tmix=frames=10:weights='1'" -y
> CombLapseWithTimeStampAndTmix.mp4
>
> And it renders, but the timestamps get blended.
>
> Can I use “split” to make one stream of images from which I can extract the
> timestamp, and then another stream for tmix, and then overlay the timestamp
> after tmix? How would I sync up the two streams, since tmix would be N frames
> shorter than the original?
Hmmm.
This:
https://youtu.be/-NB1JzR5aCQ
is the result of:
ffmpeg -pattern_type glob -i '*.jpg' -vf "split [tmp][main]; [tmp]
crop=iw:ih*0.05:0:ih*0.95, drawtext=text='%{metadata\\:DateTimeOriginal}':
fontfile=/System/Library/Fonts/Helvetica.ttc:fontcolor=white: fontsize=72:
x=(w-text_w)*0.01: y=(h-text_h)*0.01 [text]; [main] tmix=frames=10:weights='1'
[blend]; [blend][text] overlay=0:H*0.95" -y
CombLapseWithTimeStampAndTmixSplit.mp4
which approximates the result I'm trying to achieve, but it's cheating, because
it's making a separate stream of the bottom 5% of the video with the drawtext
overlay, and then overlaying that on top of the blended frames. It appears to
work only because there's nothing much happening in the bottom half of the
frames. If there were any significant bee activity in the bottom 5% it would
be apparent that that section is not getting tmixed.
Can anyone help me construct a filter chain that will overlay the internal
timestamp in an arbitrary position on top of the blended frames, after tmix has
been applied?
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