Changes between Version 12 and Version 13 of Encode/VP9

Timestamp:

Jul 30, 2018, 7:32:45 PM (8 years ago)

Author:

slhck

Comment:

note that -an can be used in first pass

Encode/VP9

@@ -37 +37 @@
 * In pass 1, output to a null file descriptor, not an actual file. (This will generate a logfile that ffmpeg needs for the second pass.)
 * In pass 1, you need to specify an output format (with `-f`) that matches the output format you will use in pass 2.
-* In pass 1, specify the audio codec used in pass 2; in many cases, `-an` in pass 1 will not work.
+* In pass 1, you can leave audio out by specifying `-an`.
 
 {{{
-ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 2M -pass 1 -c:a libopus -f webm /dev/null && \
+ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 2M -pass 1 -an -f webm /dev/null && \
 ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 2M -pass 2 -c:a libopus output.webm
 }}}