[HN Gopher] Reading thermometer temperatures over time from a video
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       Reading thermometer temperatures over time from a video
        
       Author : saeedesmaili
       Score  : 11 points
       Date   : 2023-04-04 06:48 UTC (1 days ago)
        
 (HTM) web link (til.simonwillison.net)
 (TXT) w3m dump (til.simonwillison.net)
        
       | [deleted]
        
       | zimpenfish wrote:
       | Isn't that an inefficient way to use ffmpeg to extract a frame
       | every n seconds? You'll read the first 10 seconds (d/n) times,
       | for example.
       | 
       | Probably better to grab the frames and then rename them according
       | to the time afterwards (because ffmpeg doesn't yet have
       | timestampable output filenames.)                   ffmpeg -i
       | video -fps 1/10 output_%0d.jpg         j=10         for i in
       | output_*.jpg; do           t=$(printf
       | "${OUTPUT_DIR}/frame_%02d:%02d:%02d.jpg" $((j/3600))
       | $(((j/60)%60)) $((j%60)))           mv -f "$i" "$t"
       | j=$((j+10))         done
        
       | tablespoon wrote:
       | This is an odd approach. Very Rube Goldberg.
       | 
       | I suppose they might have just wanted to whip something up using
       | the equipment they had at hand, but you could easily solve the
       | same problem with and off-the shelf device:
       | 
       | https://www.amazon.com/Perfect-Prime-4-Channel-Thermometer-T...
       | 
       | Which isn't any more expensive than the thermometer they used:
       | 
       | https://www.amazon.com/Digital-K-type-Thermocouple-Thermomet...
        
         | [deleted]
        
       | Rygian wrote:
       | Using AI to figure out what access token to use for an OCR was a
       | surprise.
       | 
       | Struggling with OCR picking up unwanted text instead of cropping
       | the pictures was also surprising.
        
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       (page generated 2023-04-05 23:00 UTC)