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Old 11th September 2019, 09:32   #1  |  Link
kolamorx
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Converting WMV to MP4/MKV without losing quality?

Is it possible to convert WMV to MP4/MKV without losing quality?
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Old 11th September 2019, 14:58   #2  |  Link
videoh
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Re-muxing does not alter the elementary streams.
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Old 11th September 2019, 16:46   #3  |  Link
manolito
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Quote:
Originally Posted by videoh View Post
Re-muxing does not alter the elementary streams.
This is true, but AFAIK it works only for an MKV container and not for MP4. Or did I miss some new features of the MP4 container format?

Out of curiosity I tried to repack a WMV2 file into an MP4 container, but all my tools failed. FFMpeg gave me this error:
Quote:
codec not currently supported in container
MP4Box quit with an unknown error, and MkvToMp4 insisted on recoding the streams to AVC/AAC.
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Old 11th September 2019, 17:02   #4  |  Link
kolamorx
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Quote:
Originally Posted by manolito View Post
AFAIK it works only for an MKV container
Which tool can do it?

Last edited by kolamorx; 11th September 2019 at 17:05.
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Old 11th September 2019, 17:17   #5  |  Link
Stereodude
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Quote:
Originally Posted by kolamorx View Post
Which tool can do it?
Like this for a simple wmv with one audio and video track:

ffmpeg.exe -i "source.wmv" -c:v copy -c:a copy "output.mkv"

Keep in mind the audio and video codecs in the resulting .mkv are still the same as the source .wmv. This conversion may not help you play the file on some device / software if that's what you're trying to do with this "conversion".

Last edited by Stereodude; 11th September 2019 at 17:20.
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Old 11th September 2019, 21:27   #6  |  Link
stax76
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@kolamorx

If you need a GUI maybe try staxrip, it supports stream copy for audio and video and it supports ffmpeg as muxer.

If want to use or learn the command line then maybe try PowerShell.
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Old 11th September 2019, 22:48   #7  |  Link
kolamorx
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Quote:
Originally Posted by Stereodude View Post
Like this for a simple wmv with one audio and video track:

ffmpeg.exe -i "source.wmv" -c:v copy -c:a copy "output.mkv"
This works well, thank you.
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