[FFmpeg-user] Converting mkv to mp3 failures

[JD]

On 07/12/2017 10:01 PM, Tim Hiles wrote:
> 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.
Out of 214 mkv videos, only 21 mp3 files were created.

I uploaded the full screen out put to:

https://www.sendspace.com/file/l5jdvs

it is called FFMPEG_ERRORS