Unknown encoder 'libfaac'

FFmpeg removed libfaac support in 2016 because the other AAC encoders are better. Use a different encoder.

Native FFmpeg AAC Encoder (-c:a aac)

Use the native, built-in FFmpeg AAC encoder:

ffmpeg -i input.wav -c:a aac output.m4a

• Included by default in all ffmpeg versions.
• Has many features, fairly good quality, supports the most channel layouts and sample rates.
• See more details and specific options with ffmpeg -h encoder=aac.

Fraunhofer FDK AAC Encoder (-c:a libfdk_aac)

ffmpeg -i input.wav -c:a libfdk_aac output.m4a

• Provides excellent quality.
• Supports HE-AAC.
• Not compatible with the GPL, and therefore not often made available by distributors, so you'll need to compile ffmpeg to use it.
• See more details and specific options with ffmpeg -h encoder=libfdk_aac.

Apple AudioToolbox AAC (-c:a aac_at)

• Only available for macOS/iOS users.
• See more details and specific options with ffmpeg -h encoder=aac_at.

Microsoft Media Foundation AAC (-c:a aac_mf)

• Only available for Windows users with ffmpeg compiled with --enable-mediafoundation.
• See more details and specific options with ffmpeg -h encoder=aac_mf.

Also see:

• FFmpeg Wiki: AAC

hopefully this helps :

Download medibuntu repository list: Code:

sudo wget http://www.medibuntu.org/sources.list.d/lsb_release -cs.list --output-document=/etc/apt/sources.list.d/medibuntu.list && sudo apt-get -q update && sudo apt-get --yes -q --allow-unauthenticated install medibuntu-keyring && sudo apt-get -q update

Grab the extras with restricted codecs: Code:

sudo apt-get install ffmpeg libavcodec-extra-52