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linux [2024/02/09 14:30] – ninelinux [2024/02/21 06:25] – nine
Line 29: Line 29:
   - https://senders.yahooinc.com/best-practices/   - https://senders.yahooinc.com/best-practices/
   - https://senders.yahooinc.com/faqs/   - https://senders.yahooinc.com/faqs/
 +
 +
 +===== Video =====
 +
 +compress video for email sending
 +
 +  ffmpeg -i input.mp4 output_compressed.mp4
 +
 +adjust volume 
 +  ffmpeg -i input.avi -af "volumedetect" -vn -sn -dn -f null /dev/null
 +  
 +gives:
 +  [Parsed_volumedetect_0 @ 0x55f12ff28780] n_samples: 1839104
 +  [Parsed_volumedetect_0 @ 0x55f12ff28780] mean_volume: -43.4 dB
 +  [Parsed_volumedetect_0 @ 0x55f12ff28780] max_volume: -31.5 dB
 +  [Parsed_volumedetect_0 @ 0x55f12ff28780] histogram_31db: 64
 +  [Parsed_volumedetect_0 @ 0x55f12ff28780] histogram_32db: 455
 +  [Parsed_volumedetect_0 @ 0x55f12ff28780] histogram_33db: 1884
 +
 +
 +increase max volume:
 +  ffmpeg -i input.avi -af "volume=30dB" -c:v copy -c:a libmp3lame -q:a 2 output.mp4
 +  
 +  
 +flip image
 +  ffmpeg -i input.mp4 -vf "transpose=2" output.mp4
 +  
 +transpose options:
 +  0 = 90° counter-clockwise and vertical flip (default)
 +  1 = 90° clockwise
 +  2 = 90° counter-clockwise
 +  3 = 90° clockwise and vertical flip
 +
linux.txt · Last modified: 2024/02/22 21:11 by nine