diff --git a/internal/ffmpeg/ffmpeg.go b/internal/ffmpeg/ffmpeg.go
index ec822d57..d3e5c6c0 100644
--- a/internal/ffmpeg/ffmpeg.go
+++ b/internal/ffmpeg/ffmpeg.go
@@ -64,18 +64,22 @@ var defaults = map[string]string{
 	// `-async 1` or `-min_comp 0` - force frame_size=960, important for WebRTC audio quality
 	"opus":       "-c:a libopus -application:a lowdelay -frame_duration 20 -min_comp 0",
 	"pcmu":       "-c:a pcm_mulaw -ar:a 8000 -ac:a 1",
+	"pcmu/8000":  "-c:a pcm_mulaw -ar:a 8000 -ac:a 1",
 	"pcmu/16000": "-c:a pcm_mulaw -ar:a 16000 -ac:a 1",
 	"pcmu/48000": "-c:a pcm_mulaw -ar:a 48000 -ac:a 1",
 	"pcma":       "-c:a pcm_alaw -ar:a 8000 -ac:a 1",
+	"pcma/8000":  "-c:a pcm_alaw -ar:a 8000 -ac:a 1",
 	"pcma/16000": "-c:a pcm_alaw -ar:a 16000 -ac:a 1",
 	"pcma/48000": "-c:a pcm_alaw -ar:a 48000 -ac:a 1",
 	"aac":        "-c:a aac", // keep sample rate and channels
 	"aac/16000":  "-c:a aac -ar:a 16000 -ac:a 1",
 	"mp3":        "-c:a libmp3lame -q:a 8",
 	"pcm":        "-c:a pcm_s16be -ar:a 8000 -ac:a 1",
+	"pcm/8000":   "-c:a pcm_s16be -ar:a 8000 -ac:a 1",
 	"pcm/16000":  "-c:a pcm_s16be -ar:a 16000 -ac:a 1",
 	"pcm/48000":  "-c:a pcm_s16be -ar:a 48000 -ac:a 1",
 	"pcml":       "-c:a pcm_s16le -ar:a 8000 -ac:a 1",
+	"pcml/8000":  "-c:a pcm_s16le -ar:a 8000 -ac:a 1",
 	"pcml/44100": "-c:a pcm_s16le -ar:a 44100 -ac:a 1",
 
 	// hardware Intel and AMD on Linux