Audio encoding presets

These are supported if you were to specify ffmpeg_stack: "v3.3.3" in your Assembly Instructions. The recommended version is: v4.3.1

Name	Format	Audio codec	Audio bitrate	Audio frequency	Video resolution
`aac`	`mp4`	`libfdk_aac`	`128000`	`44100`
`alac`	`ipod`	`alac`	`128000`	`44100`
`dash-128k-audio`	`mp4`	`libfdk_aac`	`128000`	`44100`
`dash-256k-audio`	`mp4`	`libfdk_aac`	`256000`	`44100`
`dash-32k-audio`	`mp4`	`libfdk_aac`	`32000`	`44100`
`dash-64k-audio`	`mp4`	`libfdk_aac`	`64000`	`44100`
`empty`
`flac`	`flac`		`128000`	`44100`
`gif`	`gif`				`480x270`
`mp3`	`mp3`	`libmp3lame`	`128000`	`44100`
`ogg`	`ogg`	`libvorbis`
`opus`	`ogg`	`libopus`	`128000`	`48000`
`speech`	`wav`	`pcm_s16le`		`16000`
`wav`	`wav`	`pcm_s16le`

You can override any preset's setting, such as a file's bitrate, or even the file's format & codecs via a Robot's ffmpeg parameter.

The hls- and dash- presets are intended for use in combination with our /video/adaptive Robot.

These are supported if you were to specify ffmpeg_stack: "v4.3.1" in your Assembly Instructions. The recommended version is: v4.3.1

Name	Format	Audio codec	Audio bitrate	Audio frequency	Video resolution
`aac`	`mp4`	`libfdk_aac`	`128000`	`44100`
`alac`	`ipod`	`alac`	`128000`	`44100`
`audio/aac`	`mp4`	`libfdk_aac`		`48000`
`audio/alac`	`m4a`	`alac`	`128000`	`44100`
`audio/flac`	`flac`	`flac`	`128000`	`44100`
`audio/mp3`	`mp3`	`libmp3lame`	`128000`	`44100`
`audio/ogg`	`ogg`	`libvorbis`
`dash/128k-audio`	`mp4`	`libfdk_aac`	`128000`	`44100`
`dash/256k-audio`	`mp4`	`libfdk_aac`	`256000`	`44100`
`dash/32k-audio`	`mp4`	`libfdk_aac`	`32000`	`44100`
`dash/64k-audio`	`mp4`	`libfdk_aac`	`64000`	`44100`
`dash-128k-audio`	`mp4`	`libfdk_aac`	`128000`	`44100`
`dash-256k-audio`	`mp4`	`libfdk_aac`	`256000`	`44100`
`dash-32k-audio`	`mp4`	`libfdk_aac`	`32000`	`44100`
`dash-64k-audio`	`mp4`	`libfdk_aac`	`64000`	`44100`
`empty`
`flac`	`flac`		`128000`	`44100`
`gif`	`gif`				`480x270`
`mp3`	`mp3`	`libmp3lame`	`128000`	`44100`
`ogg`	`ogg`	`libvorbis`
`opus`	`ogg`	`libopus`	`128000`	`48000`
`speech`	`wav`	`pcm_s16le`		`16000`
`wav`	`wav`	`pcm_s16le`

You can override any preset's setting, such as a file's bitrate, or even the file's format & codecs via a Robot's ffmpeg parameter.

The hls- and dash- presets are intended for use in combination with our /video/adaptive Robot.