This is a simplified discussion and probably using some kind of LUFS metering would be more appropriate.
That is for the final audio file, and not necessarily something to do with whatever limiter you are using. Thus my suspicion that the material had been compressed/limited to make it sound loud, and my recommendation to target somewhere close to -0.3dB peak and -15dB rms. If it's too compressed it will just turn it down until it's somewhere in the range of -15dB rms. In simple terms youtube reencodes the audio after you have uploaded it, if it thinks that it's "too loud" then it will make it less loud. Let me see if I can explain what I suspect is going on. Print 'aac-library (aka libfdk_aac) support first' Print 'Note: perhaps you need to compile ffmpeg with Fraunhofer' Print 'sudo apt-get install lame libavcodec-extra-53' Print 'Note: perhaps you need mp3 lame encoder first, to install do' Print 'Extracts audio from mp4/flv to lame-mp3 or Fraunhofer-aac' If len(argv)=2 and argv.lower()='mp3':Įlif len(argv)=2 and argv.lower()='aac': #you should set mypath to YOUR home folder #cutoff any frequencies above (cutoff valid range is 173 - 20000, default=14000) in aac: This can be resolved by compiling ffmpeg in a terminal like this:Ĭode: Select all from subprocess import call Libfdk_aac has been designated as "non-free", and you cannot download a pre-built ffmpeg that supports it. Which encoder should I use? What provides the best quality?įor AAC-LC the likely answer is: libfdk_aac > libfaac > Native FFmpeg AAC encoder (aac) > libvo_aacenc.
Adjust the number to the upper frequency limit you prefer. If you want to preserve higher frequencies, use -cutoff 18000. But beware, it defaults to a low-pass filter of around 14kHz. Requires ffmpeg to be configured with -enable-libfdk_aac (and additionally-enable-nonfree if you're also using -enable-gpl). This is currently the highest-quality AAC encoder available with ffmpeg. No bitrate limit requiredĬontent at 1080i 60, should be deinterlaced, going from 60 interlaced fields per second to 30 progressive frames per second before uploading.įraunhofer FDK AAC codec library. Recommended bitrates, codecs, and resolutions, and more
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