Differences

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

--- ffmpeg:only_keep_english [2023/10/30 11:04] – created peter
+++ ffmpeg:only_keep_english [2023/10/30 17:13] (current) – [ffmpeg - Only keep English] peter
@@ Line 1: / Line 1: @@
 ====== ffmpeg - Only keep English ======
+<code bash>
+ffmpeg -i "input.mkv" -c copy -map 0:v -map 0:a:m:language:eng? -map 0:s:m:language:eng? -map 0:d? -map 0:t? "output.mkv"
+ffmpeg -i "input.mkv" -map 0:v -map 0:a:m:language:eng? -c copy -c:s copy -map 0:s:m:language:eng? -map 0:d? -map 0:t? "output.mkv"
+or
+ffmpeg -i "input.mkv" -map 0:0 -map 0:a:m:language:eng? -c copy -c:s copy -map 0:s:m:language:eng? -map 0:d? -map 0:t? "output.mkv"
+ffmpeg -i "input.mkv" -c copy -map 0:v -map 0:a:m:language:eng? -c:s copy -map 0:s:m:language:eng? -map 0:d? -map 0:t? "output.mkv"
+</code>
+<WRAP info>
+**NOTE:**
+  * **-c:s copy**:  Using stream copy to remux (no encoding).
+  * **-map 0:v**:  Keep the existing Video.
+    * **-map 0:0**:  Keep the existing map 0:0.  (Assume this is the Video).
+  * **-map 0:a:m:language:eng?**:  Keep only English Audio. (Optional only if Audio exists).
+  * **-map 0:s:m:language:eng?**:  Keep only English Subtitles. (Optional only if Subtitles exist).
+  * **-map 0:d?**:  Keep Data. (Optional only if Data exists).
+  * **-map 0:t?**:  Keep Attachments. (Optional only if Attachments exists).
+</WRAP>
+----
+<code bash>
+# QUICK.
+ffmpeg -i "input.mkv" -c copy -map 0:v -map 0:a:m:language:eng? -c:s copy -map 0:s:m:language:eng? -map 0:d? -map 0:t? "out1.mkv"
+# SLOW, BUT SLIGHTLY SMALLER.
+ffmpeg -i "input.mkv" -c:v copy -map 0:v -map 0:a:m:language:eng? -c:s copy -map 0:s:m:language:eng? -map 0:d? -map 0:t? "output.mkv"
+# VERY SLOW, BUT SMALLER.
+ffmpeg -i "input.mkv" -map 0:v -c:a copy -map 0:a:m:language:eng? -c:s copy -map 0:s:m:language:eng? -map 0:d? -map 0:t? "output.mkv"
+# EXTREMELY SLOW, BUT SMALLEST.
+ffmpeg -i "input.mkv" -map 0:v -map 0:a:m:language:eng? -c:s copy -map 0:s:m:language:eng? -map 0:d? -map 0:t? "output.mkv"
+ffmpeg -i "input.mkv" -map 0:v -map 0:a:m:language:eng? -map 0:s:m:language:eng? -map 0:d? -map 0:t? "output.mkv"
+</code>
+----
+===== References =====
+https://trac.ffmpeg.org/wiki/Map