[FFmpeg-user] ffmpeg compand knobs problem
zaphod at berentweb.com
Tue May 20 18:11:37 CEST 2014
@Oliver: "I've never used libfdk_aac before ... My audio is almost
always AC3, MPEG1-L3, WAV or raw"
I am not insisting on libfdk_aac format - I just want the most
compressed but best quality format.
http://trac.ffmpeg.org/wiki/AACEncodingGuide advises in FAQ: "Which
encoder should I use? What provides the best quality? A: For AAC-LC
the likely answer is: libfdk_aac > libfaac > Native FFmpeg AAC encoder
(aac) > libvo_aacenc."
However, I just noticed this section (when I was preparing this
email): "libfaac => Freeware Advanced Audio Coder. Requires ffmpeg
configuration with --enable-libfaac --enable-nonfree. Note that you
will not get as good results as with libfdk_aac." There seems to be a
small conflict in the ffmpeg documentation? I can try a different
encoding scheme for test purposes if anyone wishes (specify which
Also, the fact that a cut section of the video encodes very nicely
with libfdk_aac and compand, while the full video does not; perhaps
gives credence to Oliver's theory.
@Moritz: I had mail delivery set to off (now on), and was responding
to my own previous posts whic resulted in the "new thread" problem. I
don't have any of the responses in my mailbox, so I cannot send as
answer. I tried to modify the header to include "In-response-to", but
that did not work well.
>> We would need your complete command line and the complete,
uncutconsole output of each of your commands
Not sure I understand - as posted previously, "ffmpeg -i day7.mpg -c:a
libfdk_aac -c:v libx264 -preset slow -crf 32 -f mp4 day7.mp4" is the
command & the only command. I stripped the "volume, compand" knobs out
for noise testing, and as advised the background static is created by
the transformation by libfdk_aac. The full console output captured by
scirpt is here:
Before trying to get the entire video to upload maybe we can check
whether the compile options are correct? In FreeBSD
(amd64_11-Current), these are stored in a separate options file and
changes (for testing) is no big deal.
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