howto:convert-images
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howto:convert-images [2024/10/20 21:07] – [3D VR SBS to 2D] Wulf Rajek | howto:convert-images [2025/05/20 11:23] (current) – [lossy conversion of png to jpg] Wulf Rajek | ||
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</ | </ | ||
- | ===== lossless changing containers between webm/ | + | ===== lossy conversion of png to jpg ===== |
+ | Converts all png files in the directory recursively to jpg | ||
+ | < | ||
+ | find . -iname ' | ||
+ | </ | ||
+ | |||
+ | ===== png to ico ===== | ||
+ | To create favicon ico files, the following command creates multiple sizes and stores them in the ico file and keeps transparency. Adjust as required.: | ||
+ | < | ||
+ | convert logo.png -define icon: | ||
+ | </ | ||
+ | |||
+ | ===== lossless changing containers between webm/ | ||
- | webm/ | + | webm/ |
< | < | ||
ffmpeg -i file.webm -c:a copy -c:v copy file.mkv | ffmpeg -i file.webm -c:a copy -c:v copy file.mkv | ||
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#find . -type f -iname ' | #find . -type f -iname ' | ||
- | #lossless change container mkv, webm, mov -> mp4 | + | #lossless change container mkv, webm, mov, m4v -> mp4 |
- | find . -type f \( -iname " | + | find . -type f \( -iname " |
ffmpeg -i " | ffmpeg -i " | ||
done | done | ||
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https:// | https:// | ||
+ | |||
+ | https:// | ||
+ | < | ||
+ | ffmpeg -i equirectangular.mp4 -filter:v " | ||
+ | </ | ||
+ | |||
+ | ===== Mono to Stereo MP3 ===== | ||
+ | |||
+ | Conversion using ffmpeg -ac 2 reduces volume by 3db, apparently to keep perceived loudness the same. To maintain the same volume use pan as below. | ||
+ | |||
+ | < | ||
+ | for i in {01..33}; do | ||
+ | ffmpeg -i " | ||
+ | done | ||
+ | </ | ||
howto/convert-images.1729454878.txt.gz · Last modified: by Wulf Rajek