Differences

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--- ffmpeg [2012/07/08 15:45] – created admin
+++ ffmpeg [2025/06/12 11:33] (current) – francesco
@@ Line 1: / Line 1: @@
+Per convertire più file alla volta:
+<code>
+mkdir newfiles
+for f in *.m4a; do ffmpeg -i "$f" -codec:v copy -codec:a libmp3lame -q:a 2 newfiles/"${f%.m4a}.mp3"; done
+</code>
+----
 Per estrarre la traccia suono da un video HD postato in YouTube (e scaricato con youtube-dl), niente di più facile:
@@ Line 33: / Line 45: @@
 </code>
-e poi si estrae la traccia Flac (questo vuol dire aac in Stream #0.1, credo):
+- e poi si estrae la traccia Flac (questo vuol dire aac in Stream #0.1, credo):
 <code>
-francesco@serverHP:~$ ffmpeg -i Halcyon.mp4
+francesco@serverHP:~$ ffmpeg -i Halcyon.mp4 Halcyon.flac
 ffmpeg version 0.7.13, Copyright (c) 2000-2011 the FFmpeg developers
   built on Jun 13 2012 14:14:09 with gcc 4.4.5
@@ Line 62: / Line 74: @@
     Metadata:
       creation_time   : 2011-06-18 17:54:47
-At least one output file must be specified
+Output #0, flac, to 'Halcyon.flac':
+  Metadata:
+    major_brand     : mp42
+    minor_version   : 0
+    compatible_brands: isommp42
+    creation_time   : 2011-06-18 17:54:45
+    encoder         : Lavf52.111.0
+    Stream #0.0(und): Audio: flac, 44100 Hz, stereo, s16, 64 kb/s
+    Metadata:
+      creation_time   : 2011-06-18 17:54:47
+Stream mapping:
+  Stream #0.1 -> #0.0
+Press [q] to stop, [?] for help
+size=   71337kB time=00:11:10.40 bitrate= 871.7kbits/s
+video:0kB audio:71329kB global headers:0kB muxing overhead 0.011443%
 </code>