user11978: I have recently come into possession of a couple of 4k movies with a resolution of 4096x2304. Unfortunately my Samsung 4k TV wont play anything over 3840x2160.
I have managed to re-encode the videos to 3840x2160, unfortunately the bitrate fell to 1/10th of what it was before.
I used:
for %%a in ("*.mkv") do ffmpeg -i "%%a" -s 3840x2610 -q:v 0 -c:v libx264 -acodec copy D:\%%~na.mp4

Original file size was 27.8GB, the re-encoded one was under 8GB.
Is there any way I can re-encode them so I can keep the original bitrate/quality?

Rant: Even my 4 year old computer can play the movie, but that fcking
  new Samsung TV of course can't /rant-end


user1871: Judge based on the quality rather than the bitrate value. Use CRF mode encoding and if the quality isn't what you can accept, decrease the CRF value.
ffmpeg -i "%%a" -s 3840x2610 -c:v libx264 -crf 18 -acodec copy D:\%%~na.mp4


11978: <p>I have recently come into possession of a couple of 4k movies with a resolution of 4096x2304. Unfortunately my Samsung 4k TV wont play anything over 3840x2160.</p>

<p>I have managed to re-encode the videos to 3840x2160, unfortunately the bitrate fell to 1/10th of what it was before.</p>

<p>I used:</p>

<pre><code>for %%a in ("*.mkv") do ffmpeg -i "%%a" -s 3840x2610 -q:v 0 -c:v libx264 -acodec copy D:\%%~na.mp4
</code></pre>

<p>Original file size was 27.8GB, the re-encoded one was under 8GB.</p>

<p>Is there any way I can re-encode them so I can keep the original bitrate/quality?</p>

<blockquote>
  <p>Rant: Even my 4 year old computer can play the movie, but that fcking
  new Samsung TV of course can't /rant-end</p>
</blockquote>
 1871: <p>Judge based on the quality rather than the bitrate value. Use CRF mode encoding and if the quality isn't what you can accept, decrease the CRF value.</p>

<pre><code>ffmpeg -i "%%a" -s 3840x2610 -c:v libx264 -crf 18 -acodec copy D:\%%~na.mp4
</code></pre>
