Answers.Body: <p>Use</p>
  
  <p><code>ffmpeg -i top.avi -i bottom.avi -filter_complex vstack,il=l=i:c=i -c:v ffv1 il.avi</code></p>
  
  <p>See docs for <a href="http://www.ffmpeg.org/ffmpeg-filters.html#vstack" rel="nofollow noreferrer">http://www.ffmpeg.org/ffmpeg-filters.html#vstack</a> and <a href="http://www.ffmpeg.org/ffmpeg-filters.html#il" rel="nofollow noreferrer">http://www.ffmpeg.org/ffmpeg-filters.html#il</a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-04-29T10:37:19.910Z
Answers.Text: Thank you so much Gyan, that is exactly what I was looking for.
Answers.UserDisplayName: gamrest
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-12-28T16:48:07.107Z
Answers.Text: Could anyone please explain this a bit?
Answers.UserDisplayName: Ondra Žižka
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-04-29T10:28:43.980Z
Answers.LastActivityDate: 2019-04-29T10:28:43.980Z
Answers.UserDisplayName: Gyan
Body: <p>I have two separate video fields (<em>top.avi</em> and <em>bottom.avi</em>) and I would like to merge them to create an interlaced video.</p>
  
  <p>Is it possible to do this with ffmpeg? (or any other tool for Windows or Linux)</p>
  
  <p><strong>ffmpeg log:</strong></p>
  
  <pre><code>Input #0, avi, from 'top.avi':
    Metadata:
      encoder         : Lavf58.20.100
    Duration: 00:03:16.03, start: 0.000000, bitrate: 13509 kb/s
      Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv420p, 640x224, 13506 kb/s, SAR 1:1 DAR 20:7, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
  Input #1, avi, from 'bottom.avi':
    Metadata:
      encoder         : Lavf58.20.100
    Duration: 00:03:16.03, start: 0.000000, bitrate: 13507 kb/s
      Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv420p, 640x224, 13503 kb/s, SAR 1:1 DAR 20:7, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
  </code></pre>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-04-29T10:06:50.477Z
Comments.Text: Share the log of `ffmpeg -i top.avi -i bottom.avi`
Comments.UserDisplayName: Gyan
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-04-29T10:24:45.690Z
Comments.Text: @Gyan Ok, here you go.
Comments.UserDisplayName: gamrest
Tags: <video><ffmpeg><windows><filter><linux>
Title: Combining two video fields into one (to create an interlaced video)
UserDisplayName: gamrest
ThreadText: # Combining two video fields into one (to create an interlaced video)
  
  (Asked by: username_0 on 2019-04-29)
  
  I have two separate video fields (*top.avi* and *bottom.avi*) and I would like to merge them to create an interlaced video.
  
  Is it possible to do this with ffmpeg? (or any other tool for Windows or Linux)
  
  **ffmpeg log:**
  
  ```
  Input #0, avi, from 'top.avi':
    Metadata:
      encoder         : Lavf58.20.100
    Duration: 00:03:16.03, start: 0.000000, bitrate: 13509 kb/s
      Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv420p, 640x224, 13506 kb/s, SAR 1:1 DAR 20:7, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
  Input #1, avi, from 'bottom.avi':
    Metadata:
      encoder         : Lavf58.20.100
    Duration: 00:03:16.03, start: 0.000000, bitrate: 13507 kb/s
      Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), yuv420p, 640x224, 13503 kb/s, SAR 1:1 DAR 20:7, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
  ```
  
  **Tags:** video, ffmpeg, windows, filter, linux
  
  > **Comments:**
  > **username_1**: Share the log of `ffmpeg -i top.avi -i bottom.avi`  
  > **username_0**: @username_1 Ok, here you go.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2019-04-29. Score: 1 | Accepted answer
  
  Use
  
  `ffmpeg -i top.avi -i bottom.avi -filter_complex vstack,il=l=i:c=i -c:v ffv1 il.avi`
  
  See docs for <http://www.ffmpeg.org/ffmpeg-filters.html#vstack> and <http://www.ffmpeg.org/ffmpeg-filters.html#il>
  
  > **Comments:**
  > **username_0**: Thank you so much username_1, that is exactly what I was looking for.  
  > **username_2**: Could anyone please explain this a bit?  
  
  ---
  
  