Answers.Body: <p>You can do something like this:</p>
  <pre><code>ffmpeg
  -i intro.mp4
  -i rtmp://second-input-server:port/input-id
  -filter_complex &quot;concat=n=2:v=1:a=1[merged_video][merged_audio]&quot;
  -map [merged_video] -map [merged_audio] -f flv rtmp://final-output:port/merged
  </code></pre>
  <ul>
  <li>We are taking two inputs, one from a local file (<code>intro.mp4</code>) and one using an rtmp address (<code>rtmp://second-input-server:port/input-id</code>).</li>
  <li>We are using the <code>concat</code> filter here, specifying that it has 2 segments to concant (<code>n=2</code>), each segment having 1 video (<code>v=1</code>) and 1 audio stream (<code>a=1</code>).</li>
  <li>We are labelling the concatted streams as <code>merged_video</code> and <code>merged_audio</code>, and muxing them into <code>flv</code> format, before sending that to the output rtmp server (<code>rtmp://final-output:port/merged</code>).</li>
  </ul>
  <p>This assumes that you have the two inputs having same number of streams (1 video and 1 audio), same frame rate, same dimensions etc. If you don't, you may need to add additional filters (e.g. <code>scale</code>, <code>fps</code>) and stream selectors (e.g. <code>[0:v:0]</code>, <code>[1:a:1]</code>) above to first make the two streams have the same characteristics, before feeding those to the <code>concat</code> filter.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-06-17T03:06:29.927Z
Answers.LastActivityDate: 2021-06-17T03:06:29.927Z
Answers.UserDisplayName: Syed Andaleeb Roomy
Body: <p>I need a ffmpeg command to first feed a mp4 video into a RTMP output stream, then followed by a RTMP input subsequently; what should be the parameters to get it working?</p>
  
Tags: <ffmpeg><mp4><rtmp>
Title: Combine mp4 video and a RTMP stream into 1 RTMP output stream via ffmpeg
UserDisplayName: Jason Lin
ThreadText: # Combine mp4 video and a RTMP stream into 1 RTMP output stream via ffmpeg
  
  (Asked by: username_0 on 2021-06-13)
  
  I need a ffmpeg command to first feed a mp4 video into a RTMP output stream, then followed by a RTMP input subsequently; what should be the parameters to get it working?
  
  **Tags:** ffmpeg, mp4, rtmp
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2021-06-17. Score: 0
  
  You can do something like this:
  
  ```
  ffmpeg
  -i intro.mp4
  -i rtmp://second-input-server:port/input-id
  -filter_complex "concat=n=2:v=1:a=1[merged_video][merged_audio]"
  -map [merged_video] -map [merged_audio] -f flv rtmp://final-output:port/merged
  
  ```
  
  * We are taking two inputs, one from a local file (`intro.mp4`) and one using an rtmp address (`rtmp://second-input-server:port/input-id`).
  * We are using the `concat` filter here, specifying that it has 2 segments to concant (`n=2`), each segment having 1 video (`v=1`) and 1 audio stream (`a=1`).
  * We are labelling the concatted streams as `merged_video` and `merged_audio`, and muxing them into `flv` format, before sending that to the output rtmp server (`rtmp://final-output:port/merged`).
  
  This assumes that you have the two inputs having same number of streams (1 video and 1 audio), same frame rate, same dimensions etc. If you don't, you may need to add additional filters (e.g. `scale`, `fps`) and stream selectors (e.g. `[0:v:0]`, `[1:a:1]`) above to first make the two streams have the same characteristics, before feeding those to the `concat` filter.
  
  
  ---
  
  