-map 0:v:0 maps the first (index 0) video stream from the input to the first (index 0) video stream in the output.
-map 1:a:0 maps the second (index 1) audio stream from the input to the first (index 0) audio stream in the output.
If the audio is longer than the video, you will want to add -shortest (or possibly -fflags shortest) before the output file name.
Not specifying an audio codec, will automatically select a working one. You can specify one by for example adding -c:a libvorbis after -c:v copy. You can also use -c copy to avoid re-encoding the audio, but this has lead to compatibility and synchronization problems in my past.
This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish.AcceptRead More
Privacy & Cookies Policy
Privacy Overview
This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
Paolo Redaelli
See also https://williamyaps.blogspot.com/2017/01/ffmpeg-encoding-h264-decrease-size.html for extensive informations of compression settings
From https://superuser.com/questions/1137612/ffmpeg-replace-audio-in-video#1137613
You will want to copy the video stream without re-encoding to save a lot of time but re-encoding the audio might help to prevent incompatibilities:
ffmpeg -i v.mp4 -i a.wav -c:v copy -map 0:v:0 -map 1:a:0 new.mp4
-map 0:v:0 maps the first (index 0) video stream from the input to the first (index 0) video stream in the output.
-map 1:a:0 maps the second (index 1) audio stream from the input to the first (index 0) audio stream in the output.
If the audio is longer than the video, you will want to add -shortest (or possibly -fflags shortest) before the output file name.
Not specifying an audio codec, will automatically select a working one. You can specify one by for example adding -c:a libvorbis after -c:v copy. You can also use -c copy to avoid re-encoding the audio, but this has lead to compatibility and synchronization problems in my past.