Answers.Body: <p>Compression by default is removing information. “Lossless” compression, if repeated, will indeed result in degradation after a few generations.</p>
  
  <p>Higher compression rates will degrade after fewer generations.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-10-22T12:46:11.393Z
Answers.LastActivityDate: 2018-10-22T12:46:11.393Z
Answers.UserDisplayName: AskMrVideo
Answers.Body: <p>If you give same bitrate setting (I assume it is configurable in Adobe Premiere), I don't expect you perceive the quality difference.</p>
  
  <p>You could use FFMPEG to remove the audio on your first output with <code>-an</code> flag. Command will be like</p>
  
  <p><code>ffmpeg -i first_output.mp4-c copy -an nosound_output.mp4</code></p>
  
  <p><a href="http://www.ffmpeg.org/ffmpeg-doc.html#SEC8" rel="nofollow noreferrer">Reference</a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-10-22T05:37:22.787Z
Answers.Text: Thanks.  I tried your FFMPEG solution to see if there was any difference.  Resulting total bit rates as follows:
  1st output: 42953kbps
  2nd output: 42584kbps
  FFMPEG output: 42629kbps
Answers.UserDisplayName: indispensable PC
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-10-21T20:18:04.883Z
Answers.LastActivityDate: 2018-10-21T20:18:04.883Z
Answers.UserDisplayName: Chien-Yu
Body: <p>After exporting a time lapse video as H.246 mp4 using Adobe Premiere I realized I wanted a second copy without sound, but I had already changed the settings.  To save time I simply imported the mp4 to Premiere and then exported it again with the same H.246 settings but without the audio channel.</p>
  
  <p>After close analysis of the 2 files I can't perceive any loss in quality, but I worry that I may have lost a tiny bit of quality through this process. Would repeating this process eventually result in noticeable loss of quality?  </p>
  
Tags: <video><premiere><quality>
Title: Would repeatedly importing and exporting H.246 video result in loss of quality?
UserDisplayName: indispensable PC
ThreadText: # Would repeatedly importing and exporting H.246 video result in loss of quality?
  
  (Asked by: username_0 on 2018-10-21)
  
  After exporting a time lapse video as H.246 mp4 using Adobe Premiere I realized I wanted a second copy without sound, but I had already changed the settings. To save time I simply imported the mp4 to Premiere and then exported it again with the same H.246 settings but without the audio channel.
  
  After close analysis of the 2 files I can't perceive any loss in quality, but I worry that I may have lost a tiny bit of quality through this process. Would repeating this process eventually result in noticeable loss of quality?
  
  **Tags:** video, premiere, quality
  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_1 on 2018-10-22. Score: 2
  
  Compression by default is removing information. “Lossless” compression, if repeated, will indeed result in degradation after a few generations.
  
  Higher compression rates will degrade after fewer generations.
  
  
  ---
  
  ### Answer by username_2 on 2018-10-21. Score: 1
  
  If you give same bitrate setting (I assume it is configurable in Adobe Premiere), I don't expect you perceive the quality difference.
  
  You could use FFMPEG to remove the audio on your first output with `-an` flag. Command will be like
  
  `ffmpeg -i first_output.mp4-c copy -an nosound_output.mp4`
  
  [Reference](http://www.ffmpeg.org/ffmpeg-doc.html#SEC8)
  
  > **Comments:**
  > **username_0**: Thanks.  I tried your FFMPEG solution to see if there was any difference.  Resulting total bit rates as follows: 1st output: 42953kbps 2nd output: 42584kbps FFMPEG output: 42629kbps  
  
  ---
  
  