ffmpeg converting from mkv to mp4 without re-encoding
<p>I am using ffmpeg to switch container from mkv to mp4 via this command:</p>

<pre><code>ffmpeg -i filename.mkv -vcodec copy 1.mp4
</code></pre>

<p>this is the simplest command that I found when converting from mkv container to mp4 without re-encoding. The output stated otherwise (if I am not mistaken)</p>

<p>This is a small screen shot of the the output: </p>

<p><a href="https://i.stack.imgur.com/44I9Z.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/44I9Z.jpg" alt="FFmpeg Screenshot"></a></p>

<p>Where it said Stream Mapping, #0:0 (264 (native)) -> 264 (libx264)). Does this mean that it's re-encoding from x264 to libx264? What Did I do wrong? </p>

<p>Any help is appreciated...</p>