title: How to trim a large video with ffmpeg?
body: <p>I am trying to trim a video that is 75 GB size and 1 hour and 28 minutes long</p>
  
  <p>I only want to get 7 seconds out of it</p>
  
  <p>When I try this </p>
  
  <pre><code>ffmpeg -i Replay.mp4 -ss 01:21:24.0000 -to 01:21:32.0000 -acodec copy -vcodec copy ShortReplay2.mp4
  </code></pre>
  
  <p>I get this</p>
  
  <pre><code>Stream mapping:
    Stream #0:1 -&gt; #0:0 (copy)
    Stream #0:0 -&gt; #0:1 (copy)
  Press [q] to stop, [?] for help
  frame=    0 fps=0.0 q=-1.0 size=       0kB time=00:00:00.00 bitrate=N/A
  </code></pre>
  
  <p>It's stuck and nothing happens, have waited for about 30 minutes and is still stuck</p>
  
  <p>However when I try trimming it from the beginning of the video</p>
  
  <pre><code>ffmpeg -i Replay.mp4 -ss 00:00:00.000 -to 00:20:00.000 -acodec copy -vcodec copy ShortReplay2.mp4
  </code></pre>
  
  <p>It works without issues</p>
  
  <p>Is it because the file size is too big and the program takes too long to read it? What can I do?</p>