Answers.Body: <p>Can you try using the following:</p>
  <pre><code>ffmpeg -hide_banner -y -i color.mp4 -i alpha.mp4 \
     -shortest -filter_complex [0:v][1:v]alphamerge -map \
     0:a:0 output.webm
  </code></pre>
  
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Body: <p>I am currently creating a webm file using two mp4's (alpha - black background, white silthoette) and normal video.</p>
  <p>Using following ffmpeg command:</p>
  <pre><code>ffmpeg -i color.mp4 -i alpha.mp4 \
         -filter_complex [0][1]alphamerge,format=yuva420p \
         -c:v libvpx -strict -2 -auto-alt-ref 0 \
         output.webm
  </code></pre>
  <p>And while this works fine for most browsers, it doesn't work on iOS, so I need to create a .mov (or maybe something else?) file with transparent background.</p>
  <p>What is the proper way to do it in ffmpeg?</p>
  
Tags: <ffmpeg><video><ios>
Title: FFMPEG: Video format replacement for webm (alpha channel)
UserDisplayName: John
ThreadText: # FFMPEG: Video format replacement for webm (alpha channel)
  
  (Asked by: username_0 on 2022-03-18)
  
  I am currently creating a webm file using two mp4's (alpha - black background, white silthoette) and normal video.
  
  Using following ffmpeg command:
  
  ```
  ffmpeg -i color.mp4 -i alpha.mp4 \
         -filter_complex [0][1]alphamerge,format=yuva420p \
         -c:v libvpx -strict -2 -auto-alt-ref 0 \
         output.webm
  
  ```
  
  And while this works fine for most browsers, it doesn't work on iOS, so I need to create a .mov (or maybe something else?) file with transparent background.
  
  What is the proper way to do it in ffmpeg?
  
  **Tags:** ffmpeg, video, ios
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2022-05-16. Score: 0
  
  Can you try using the following:
  
  ```
  ffmpeg -hide_banner -y -i color.mp4 -i alpha.mp4 \
     -shortest -filter_complex [0:v][1:v]alphamerge -map \
     0:a:0 output.webm
  
  ```
  
  > **Comments:**
  > **username_2**: As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer).  
  
  ---
  
  