[Libav-user] Unable to enable audio filter?
rhuang.work at gmail.com
Tue May 6 20:32:56 CEST 2014
Due to dependency issues, I am running ffmpeg 0.7.16.
I am writing a custom audio filter for ffmpeg for my research. Naturally I start out with the simplest one for reference, "anullsink" (there are really only 3 in this version anyways - anullsink, anullsrc, and anull). However I seemed to unable to run it it. Running:
# ./ffmpeg -y -i meowmix.mp3 -vf anullsink meowmix.wav
I am expecting to end up with an audio file meowmix.wav that has nothing. Instead the source mp3 and destination wav files sound exactly the same. I thought I had screwed up and rerun the previous command with "anullsrc". Still the same.
My last attempt was to add a AV_LOG_ERROR() line in the null_filter_samples() function in asink_anullsink.c. When I run the command again there were no error outputs. It seemed as if the anullsink was never used…
Any help will be appreciated, thanks!
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