Changes between Version 37 and Version 38 of FancyFilteringExamples

Timestamp:

Dec 2, 2020, 1:00:24 AM (6 years ago)

Author:

varenc

Comment:

add side by side showcqt example. A bit tricky when done with ffplay.

FancyFilteringExamples

@@ -159 +159 @@
 [[Image(showcqt.png)]]
 
+
+Given a media file with audio and video, play the video side by side with the audio's showcqt visualization:
+
+{{{
+ffplay -f lavfi "movie=big_buck_bunny_480p_surround-fix.avi:streams=dv+da[v][a],[a]asplit=2[out1][a],[a]showcqt=s=400x900[vfun],[v]scale=-2:900[v];[v][vfun]hstack[out0]"
+}}}
+[[Image(showcqt-sidebyside.jpg,1080)]]
+
+Notes: Since we're using `hstack`, we must scale the input video so that its height is the same as the showcqt output height (900).  The `asplit` filter is used to duplicate the audio stream.  One stream is for listening during playback (`out1`), and the other stream (`a`) is consumed by the showcqt filter and turned into video (`vfun`). This is the [https://archive.org/download/BigBuckBunny/big_buck_bunny_480p_surround-fix.avi example video] used above.  
+
+Here's another way to do the same thing with ffmpeg:
+
+{{{
+ffmpeg -i big_buck_bunny_480p_surround-fix.avi -filter_complex '[0:a]showcqt=s=400x900[vfun],[0:v]scale=-2:900[v];[v][vfun]hstack[vo]' -map '[vo]' -map 0:a  out.mp4
+}}}
+
+
 === showspectrumpic ===