Failed to convert webm audio file to mp4 using FFMPEG

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I have a webm audio file , I was trying to convert it into mp4 using ffmpeg. But it is failed to create the mp4. The info about the file is as follows.

fmpeg -i 54ebe077-96fc-4ace-9a38-f13c58807322.webm -hide_banner

Input #0, matroska,webm, from '54ebe077-96fc-4ace-9a38-f13c58807322.webm':
  Metadata:
    encoder         : Lavf56.40.101
    creation_time   : 2019-10-22T11:19:12.000000Z
  Duration: 00:00:24.16, start: 0.000000, bitrate: 41 kb/s
    Stream #0:0: Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
    Stream #0:1: Audio: opus, 48000 Hz, mono, fltp (default)
At least one output file must be specifiedffmpeg -i  54ebe077-96fc-4ace-9a38-f13c58807322.webm -qscale 0 out.mp4

I was tried to convert it using the following command 

ffmpeg -i  54ebe077-96fc-4ace-9a38-f13c58807322.webm -qscale 0 out.mp4

It throws errors 

[opus @ 0x56489c7f9840] LBRR frames is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[opus @ 0x56489c7f9840] Error decoding a SILK frame.
[opus @ 0x56489c7f9840] Error decoding an Opus frame.
Too many packets buffered for output stream 0:1.
[aac @ 0x56489c82d640] Qavg: 59180.625
[aac @ 0x56489c82d640] 2 frames left in the queue on closing
Conversion failed!

How to fix this issue? I have played the file in VLC and I can hear the sound from the source file. But failed to convert it

webm mp4 ffmpeg
1 Answers

Your ffmpeg is too old

Update your ffmpeg:

This was ticket #4641: Error decoding SILK frame. The fix is newer than the most current release branch (FFmpeg 4.3 as of writing this), so you have to get a build from the git master branch (either of the links above will do), or wait for FFmpeg 4.4.

If you can't update

If you can't update your ffmpeg the old workaround is to use libopus to decode:

ffmpeg -c:a libopus -i input ...
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