Little help comverting MKV?

[deadbunneh]

Wondered if someone could throw some light on this one for me please?

Got some MKV files that I'm trying to convert to MP4 but when I converted them there was no audio. Looked online quite a bit to try figure it out. Tried demuxing to get an audio file that I can remux with the mkv but most apps I tried don't even give me an audio file.
I'm on a Mac btw.

The media info is below.

General / Container Stream #1
Total Video Streams for this File.................1
Total Audio Streams for this File.................1
Video Codecs Used.................................V_MPEGH/ISO/HEVC
Audio Codecs Used.................................A_OPUS
File Format.......................................Matro ska
Play Time.........................................22mn 11s
Total File Size...................................142 MiB
Total Stream BitRate..............................896 Kbps
Encoded with......................................mkvmerge v8.7.0 ('All of the above') 32bit
Encoding Library..................................libebml v1.3.3 + libmatroska v1.4.4
Video Stream #1
Codec (Human Name)................................V_MPEGH/ISO/HEVC
Codec (FourCC)....................................V_MPEG H/ISO/HEVC
Frame Width.......................................1 280 pixels
Frame Height......................................720 pixels
Frame Rate........................................23.976 fps
Total Frames......................................31913
Display Aspect Ratio..............................16:9
Video Stream Length...............................22mn 11s 39ms
Audio Stream #1
Codec............................................. A_OPUS
Codec (FourCC)....................................A_OPUS
Audio Stream Length...............................22mn 11s 25ms
Number of Audio Channels..........................2
Sampling Rate.....................................48.0 KHz
Audio Stream Language.............................Abkhazian

[JVRaines]

Don't think you're allowed to put Opus audio in an MP4 container. FFmpeg will do the job:

ffmpeg -i myinput.mkv -c:v copy -c:a aac -b:a 160k(or whatever audio bitrate you want) myoutput.mp4

[Krispy Kritter]

Assuming the original files play fine, the problem would likely be with whatever tool you used to perform the conversion.

Give VidCoder a try.

[videobruger]

Or something that can use "Copy" for the video like Xmedia Recode.

[deadbunneh]

Thanks guys - I'm on a mac, are there equivalents to the apps you mentioned?

Tried ffmpeg through terminal and I get an 'unknown format' error:

[matroska @ 0x5597b8]Matroska demuxer version 1 too old for file version 2
/Users/mainuser/Desktop/movie.mkv: Unknown format

[Krispy Kritter]

I've never used a mac, much less tried to find software for one.

Mac's are great if you use the professional tools, but once you start trying to find free or cheap tools, 99% of the users, and thus the tools are Windows based.

As for the error, it would appear you are using an old version of ffmpeg.

Good luck.

[deadbunneh]

Thanks

Vix x

[gonca]

handbrake

[johns0]

Thread moved to the mac forum where you can get more help.

[JVRaines]

Thanks guys - I'm on a mac, are there equivalents to the apps you mentioned?

Tried ffmpeg through terminal and I get an 'unknown format' error:

[matroska @ 0x5597b8]Matroska demuxer version 1 too old for file version 2
/Users/mainuser/Desktop/movie.mkv: Unknown format

Download the latest FFmpeg from
https://ffmpeg.org/download.html#build-mac

[deadbunneh]

Tried the latest ffmpeg build and it's still giving me the unknown format error. I tried Handbrake previously but in the audio tab it's showing no audio channel - it plays fine in VLC.

Very frustrating!

Vix x

[Case]

Tried the latest ffmpeg build and it's still giving me the unknown format error.

Are you sure you called on the new ffmpeg 3.1.1 binary correctly? It sounds a bit presumptuous, I know, but (a) that old demuxer error is really old and should have been resolved several versions ago and (b) ffmpeg 3.1.1 works with the HEVC/OPUS MKV version 2 that I could find. I tried the OSX Experts and Tessus (Evermeet) pre-compiled versions of ffmpeg 3.1.1 in Terminal and a conversion with the iFFmpeg GUI (backed by the OSX Experts binary).

[deadbunneh]

Case the OSXperts with the iFFMPEG GUI seems to have worked! Really appreciate all your help guys

Vix x