ffmpeg with libfdk_aac: AAC-HE-V2 profile doesn't work for mono sound?

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RocketNuts

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RocketNuts Asks: ffmpeg with libfdk_aac: AAC-HE-V2 profile doesn't work for mono sound?
Whenever I use ffmpeg with libfdk_aac to convert a piece of audio to AAC, I noticed the aac_he_v2 profile does not work if the source audio is mono. For example:

Code:
ffmpeg -i mono.wav -c:a libfdk_aac -profile:a aac_he_v2 output.m4a

Gives an error:

Unable to initialize the encoder: SBR library initialization error
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

I can overcome this by adding the -ac 2 option to force stereo. However it seems strange to me that this profile demands the audio to be stereo, whereas it works fine without specifying the AAC-HE-V2 profile. Maybe that's my lack of understanding how this encoder or profile works, but is it supposed to be like that?

Furthermore I assume that by specifying -ac 2 ffmpeg will just 'fake' stereo by copying the single audio stream to an identical left and right channel?

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SFTP user login details real-time filtering

  • Amal P Ramesh
  • Main forum
  • Replies: 0
Amal P Ramesh Asks: SFTP user login details real-time filtering
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Code:
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