[FFmpeg-user] Converting mkv to mp3 failures

[Tim Hiles]

On Wed, Jul 12, 2017 at 7:54 PM, JD <jd1008 at gmail.com> wrote:

> I just wanted to point out that 99% of files I download
> as mkv, and then try to convert them to mp3 with the command:
>
> ffmpeg -i somefile.mkv -vn -c:a libmp3lame -ab 320k -ac 2 -y somefile.mp3
>
> fail to convert, with huge amount of error messages output.
>
> PS: Using ffmpeg version 3.0.2-static
>
> The conversion to mkv is done by youtube-dl automatically.
>
> So, is youtube-dl the culprit by creating bad mkv output?
>
> Would love to hear how I can make this work.
>
>
Please post full uncut command output.