Differences

This shows you the differences between two versions of the page.

--- ubuntu:sound:bitrate:change_bitrate [2022/09/19 11:06] – created peter
+++ ubuntu:sound:bitrate:change_bitrate [2022/09/19 11:11] (current) – [Using only built in Bash functions] peter
@@ Line 1: / Line 1: @@
 ====== Ubuntu - Sound - Bitrate - Change Bitrate ======
+===== Convert MP3 files in all sub-directories to a different bitrate =====
+<code bash>
+find . -type f -name "*.mp3" -print0 | while IFS= read -r -d '' file; do echo "$file"; lame -b 192 "$file" "${file%.*}".192.mp3; done
+</code>
+<WRAP info>
+**NOTE:** The bitrate is set to 192 kbps.
+</WRAP>
+----
+===== Convert MP3 files in all sub-directories to a different bitrate, but only if they have bitrates above a specific value =====
+==== Using only built in Bash functions ====
+<code bash>
+find . -type f -name "*.mp3" -print0 | while IFS= read -r -d '' file; do echo "$file"; [[ $(file "$file" | sed 's/.*, \(.*\)kbps.*/\1/' | tr -d " ") -gt 192 ]] && lame -b 192 "$file" "${file%.*}".192.mp3 && mv "${file%.*}".192.mp3 "$file"; done
+</code>
+<WRAP warning>
+**WARNING:** This uses the **file** command to determine the bitrate.
+  * Unfortunately, sometimes the **file** command does not return the bitrate and returns something like **Audio file with ID3 version 2.3.0**.
+  * For these files, the **$(file "$file" | sed 's/.*, \(.*\)kbps.*/\1/' | tr -d " ")** part will not work.
+  * The bitrate is set to 192 kbps for any file that has a bitrate above 192 kbps.
+</WRAP>
+----
+==== Using mp3info ====
+<code bash>
+find . -type f -name "*.mp3" -print0 | while IFS= read -r -d '' file; do echo "$file"; [[ $(mp3info -r m -p "%r" "$file") -gt 192 ]] && lame -b 192 "$file" "${file%.*}".192.mp3 && mv "${file%.*}".192.mp3 "$file"; done
+</code>
+<WRAP info>
+**NOTE:** This uses the **mp3info** command to determine the bitrate.
+    * This **mp3info** command needs to be installed with **sudo apt install mp3info**.
+</WRAP>