user35789: What is best way, to join a Video-Only file, .m4v
with m4a audio file, and output as mp4
Want to join them, without losing original quality,
both file have same time length.
any good software.etc?

user35763: ffmpeg -i audiofile.m4a -i videofile.m4v  -c copy  combined.mp4

Here -c copy tells to copy the stream instead of re-encoding. So the streams are as before. It is fastest and lossless.

35789: <p>What is best way, to join a Video-Only file, .m4v
with m4a audio file, and output as mp4</p>
<p>Want to join them, without losing original quality,
both file have same time length.</p>
<p>any good software.etc?</p>
 35763: <pre><code>ffmpeg -i audiofile.m4a -i videofile.m4v  -c copy  combined.mp4
</code></pre>
<p>Here <code>-c copy</code> tells to copy the stream instead of re-encoding. So the streams are as before. It is fastest and lossless.</p>
