Invalid Data Found Error During Conversion

[dinceremre]

During webm to mp4 conversion I receive the following error.
I submit a populated webm blob to webm-mp4 convertor. Still no luck with the conversion.
Any hints for a workaround are highly appreciated.

input.webm: Invalid data found when processing input
    at Object.onExit (index.js:20:11)
    at q.quit (ffmpeg-mp4.js:19:34)
    at _ (ffmpeg-mp4.js:18:76)
    at R (ffmpeg-mp4.js:101:406)
    at Tk (ffmpeg-mp4.js:129:108942)
    at Array.ck (ffmpeg-mp4.js:129:21234)
    at hk (ffmpeg-mp4.js:129:33188)
    at uk (ffmpeg-mp4.js:129:17042)
    at iB (ffmpeg-mp4.js:129:156148)
    at e (ffmpeg-mp4.js:16:439)
    at Object.onExit (index.js:20:11)
    at q.quit (ffmpeg-mp4.js:19:34)
    at e (ffmpeg-mp4.js:17:77)
    at L (ffmpeg-mp4.js:17:483)
    at A.exports (ffmpeg-mp4.js:161:115)
    at A.exports (index.js:8:9)
    at Object.<anonymous> (RoomClient.js:4655:19)
onExit @ index.js:20
q.quit @ ffmpeg-mp4.js:19
e @ ffmpeg-mp4.js:17
L @ ffmpeg-mp4.js:17
A.exports @ ffmpeg-mp4.js:161
A.exports @ index.js:8
(anonim) @ RoomClient.js:4655
await in (anonim) (eş zamansız)
r @ RecordRTC.js:181
(anonim) @ RecordRTC.js:5521
(anonim) @ RecordRTC.js:2327
setTimeout (eş zamansız)
Z.stop @ RecordRTC.js:2322
F.stop @ RecordRTC.js:5518
t @ RecordRTC.js:133
stopRecording @ RoomClient.js:4647
onClick @ TopBar.js:419
a @ react-dom.production.min.js:14
h @ react-dom.production.min.js:14
(anonim) @ react-dom.production.min.js:14
k @ react-dom.production.min.js:15
fe @ react-dom.production.min.js:52
te @ react-dom.production.min.js:51
ae @ react-dom.production.min.js:52
he @ react-dom.production.min.js:56
P @ react-dom.production.min.js:287
X @ react-dom.production.min.js:19
qe @ react-dom.production.min.js:70
Ke @ react-dom.production.min.js:69
e.unstable_runWithPriority @ scheduler.production.min.js:19
Xt @ react-dom.production.min.js:122
V @ react-dom.production.min.js:287
Le @ react-dom.production.min.js:68