diff --git a/JlSonic/api.jl b/JlSonic/api.jl
index 6786c50..c9e088c 100644
--- a/JlSonic/api.jl
+++ b/JlSonic/api.jl
@@ -514,19 +514,21 @@ function getCoverArt(req::Dict)
 end
 
 function giveconverted(file, bitrate, format)
-    data = convert(file, bitrate = bitrate, format = format)
+    iodata = convert(file, bitrate = bitrate, format = format)
     headers = Dict{String,String}()
     suffix = format
     mime = suffix in keys(Mux.mimetypes) ? Mux.mimetypes[suffix] : suffix
     headers["Content-Type"] = mime
-    headers["Content-Length"] = string(length(data))
-    return Dict(:body => data, :headers => headers)
+    # headers["Content-Length"] = string(length(data))
+    return Dict(:body => take!(iodata), :headers => headers)
 end
 
 function convert(infile; bitrate = 64, format = "oga")
     global ffmpeg_threads
-    pipeline(`ffmpeg -i $infile -y -c:a libvorbis -b:a $(bitrate)k -threads $(ffmpeg_threads) -f $format pipe:1`,
-             stderr=devnull) |> read
+    io = IOBuffer()
+    run(pipeline(`ffmpeg -i $infile -y -c:a libvorbis -b:a $(bitrate)k -threads $(ffmpeg_threads) -f $format pipe:1`,
+                 stderr=devnull, stdout=io), wait = false)
+    io
 end
 
 canstream(u::User) = u.stream