Dear FFmpeg User Mailing List,
The versions of certain libraries are printed in the banner, such as
libavcodec.
I am curious how to find information about linked libraries, such as
libmp3lame, the LAME MP3 encoder. I would like to know:
1. Was it statically or dynamically linked?
2. If dynamically linked, where is the libmp3lame.so file?
(I think the answer is /usr/local/libmp3lame.dylib in my case on my Mac,
but I want FFmpeg to tell me. I am not on Kubuntu right now, but I can
probably find it on Kubuntu also, and I'm guessing it is an .so and not
a .dylib file on that OS.)
3. What is the version of the linked library? Here is how I can ask LAME
itself, from the LAME CLI front-end for libmp3lame:
bash$ lame --version
LAME 64bits version 3.100 (http://lame.sf.net)
-----
Here is my best guess:
bash$ ffmpeg -h encoder=libmp3lame
Encoder libmp3lame [libmp3lame MP3 (MPEG audio layer 3)]:
General capabilities: delay small
Threading capabilities: none
Supported sample rates: 44100 48000 32000 22050 24000 16000 11025
12000 8000
Supported sample formats: s32p fltp s16p
Supported channel layouts: mono stereo
libmp3lame encoder AVOptions:
-reservoir <boolean> E...A... use bit reservoir (default true)
-joint_stereo <boolean> E...A... use joint stereo (default true)
-abr <boolean> E...A... use ABR (default false)
This looks promising, but it turns out all of that information is
hardcoded in this file:
ffmpeg/libavcodec/libmp3lame.c
You can even change this string:
AVCodec ff_libmp3lame_encoder = {
// ...snip...
.long_name = "libmp3lame MP3 (MPEG audio layer 3)"
...and the FFmpeg help will display whatever you type. It is not pulling
it from the library.
This is intended to be a general question, so I am not going to include
a specific FFmpeg banner because I use FFmpeg on two operating systems
(MacOS 10.12 and Kubuntu) and I have multiple versions of FFmpeg.
Thank you,
Zak F.
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