user19746: I'm cutting audio out of files, and I'm running into an issue. When I run FFMPeg with this command

FFMPEG.exe -i in.webm -q:a 0 -map a -ss hh:mm:ss -to hh:mm:ss -y out.mp3

If the -ss parameter is rather large (lets say 00:30:00), it takes a long time before it even starts cutting -- It just sits on the below statement for a long time before finally starting.

size=       0kB time=00:00:00.00 bitrate=N/A

Does anyone know why it would do this and how I could fix it?

user1871: -ss after the input name performs a slow seek where ffmpeg decodes all frames but discards till it reaches the seek point.
With -ss before -i, ffmpeg performs a fast seek.
FFMPEG.exe -ss hh:mm:ss -i in.webm -q:a 0 -map a -t hh:mm:ss -y out.mp3

But you'll have to specify a duration instead of to with most formats.

19746: <p>I'm cutting audio out of files, and I'm running into an issue. When I run FFMPeg with this command</p>

<blockquote>
  <p>FFMPEG.exe -i in.webm -q:a 0 -map a -ss hh:mm:ss -to hh:mm:ss -y out.mp3</p>
</blockquote>

<p>If the <code>-ss</code> parameter is rather large (lets say <code>00:30:00</code>), it takes a long time before it even starts cutting -- It just sits on the below statement for a long time before finally starting.</p>

<blockquote>
  <p>size=       0kB time=00:00:00.00 bitrate=N/A</p>
</blockquote>

<p>Does anyone know why it would do this and how I could fix it?</p>
 1871: <p><code>-ss</code> after the input name performs a slow seek where ffmpeg decodes all frames but discards till it reaches the seek point.</p>

<p>With <code>-ss</code> before <code>-i</code>, ffmpeg performs a fast seek.</p>

<pre><code>FFMPEG.exe -ss hh:mm:ss -i in.webm -q:a 0 -map a -t hh:mm:ss -y out.mp3
</code></pre>

<p>But you'll have to specify a duration instead of <code>to</code> with most formats.</p>
