Answers.Body: <p>since there is no loop option on the mapped stream; therefore you need 2 steps</p>
  <ol>
  <li>ffmpeg -y -stream_loop 2 -i <a href="https://www.learningcontainer.com/wp-content/uploads/2020/05/sample-mp4-file.mp4" rel="nofollow noreferrer">https://www.learningcontainer.com/wp-content/uploads/2020/05/sample-mp4-file.mp4</a> output.wav</li>
  <li>ffmpeg -y -i output.wav -i <a href="https://www.learningcontainer.com/wp-content/uploads/2020/05/sample-mp4-file.mp4" rel="nofollow noreferrer">https://www.learningcontainer.com/wp-content/uploads/2020/05/sample-mp4-file.mp4</a> -filter:v &quot;setpts=1.3*PTS&quot; -shortest output.mp4</li>
  </ol>
  <p>Note: stream_loop number is the ceiling of factor</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-08-22T08:39:47.103Z
Answers.LastActivityDate: 2020-08-22T08:39:47.103Z
Answers.UserDisplayName: xer-rex
Body: <p>I am trying to use ffmpeg to slow down a video speed by 25% (75% speed) without changing the audio speed.</p>
  <pre><code>ffmpeg -i input_video.mkv -filter:v &quot;setpts=1.3*PTS&quot; &quot;SlowVideo25.mp4&quot;
  </code></pre>
  <p>On doing so, the audio finishes first and the video continues to play for some more seconds. I want to use ffmpeg to loop/repeat the audio track in this case. So when the audio finishes, it plays the audio from the beginning for the remainder of the video.</p>
  <p>Is this do-able using ffmpeg?</p>
  
Tags: <ffmpeg><encoding><mp4><h.264>
Title: ffmpeg - Slow down video and loop/repeat audio
UserDisplayName: user1534235
ThreadText: # ffmpeg - Slow down video and loop/repeat audio
  
  (Asked by: username_0 on 2020-08-20)
  
  I am trying to use ffmpeg to slow down a video speed by 25% (75% speed) without changing the audio speed.
  
  ```
  ffmpeg -i input_video.mkv -filter:v "setpts=1.3*PTS" "SlowVideo25.mp4"
  
  ```
  
  On doing so, the audio finishes first and the video continues to play for some more seconds. I want to use ffmpeg to loop/repeat the audio track in this case. So when the audio finishes, it plays the audio from the beginning for the remainder of the video.
  
  Is this do-able using ffmpeg?
  
  **Tags:** ffmpeg, encoding, mp4, h.264
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2020-08-22. Score: 0
  
  since there is no loop option on the mapped stream; therefore you need 2 steps
  
  1. ffmpeg -y -stream\_loop 2 -i <https://www.learningcontainer.com/wp-content/uploads/2020/05/sample-mp4-file.mp4> output.wav
  2. ffmpeg -y -i output.wav -i <https://www.learningcontainer.com/wp-content/uploads/2020/05/sample-mp4-file.mp4> -filter:v "setpts=1.3\*PTS" -shortest output.mp4
  
  Note: stream\_loop number is the ceiling of factor
  
  
  ---
  
  