The first thing to do is determine what streams are in the video, which we can do with the following command: $ ffmpeg -i sintel_trailer-1080p.mp4 -hide_banner The bit rates will be 2 kB/s and 365 kb/s respectively (as per Apple’s guidelines). We’ll create two variants: a 540p and a 360p version. Apple publishes guidelines for authoring HLS video streams that includes – among other things – recommended video and audio bit rates. The examples below use the 1080p version of the Sintel trailer which you can download here. It allows a client device to choose the most appropriate stream based on factors such as the capabilities of the device, available bandwidth, and so on. ffmpeg.exe -i videoWithAudio.mp4 -map 0 -map 0:a:1 -copy videoOutput.In this post you’ll see how to create an HLS master playlist with ffmpeg for video on-demand.Ī master playlist contains references to different variant streams (typically encoded at different bit rates) and can also include links to alternative audio tracks and audio-only renditions. So, basically, you are selecting everything and then de-selecting the audio. Also, -map 0 selects everything from the first input. In our example, if your file has 1 video track and two audio tracks, then you can use -map 0:a:1 to only select the second audio track and copy it to your final output. So, you could select the 2nd audio track of the video by saying -map 0:a:1 because the numbering starts at 0. The general syntax of the map command is -map input_file_index:stream_type_specifier:stream_index. How to Remove a Specific Audio Track using FFmpeg For removing a specific audio track using FFmpeg, you can always use the map command. But, what happens if you have three or four audio tracks and you want to remove only the second audio track? How do you remove a specific audio track using FFmpeg? Let's take a look in the next section.
ffmpeg.exe -i videoWithAudio.mp4 -c:v copy -an videoWithoutAudio.mp4 -c:v copy copies the video track into videoWithoutAudio.mp4 copies the video track into -an tell FFmpeg to not copy the audio Now this works great if you have only one audio track in your movie. Here is the command line for achieving this. This is a simple technique because it does not involve the re-encoding of the video while you are at it. The simplest way to remove or delete audio is to actually copy the video to a new file and discard the audio while doing this. This could be because of road-noise or background noise, etc. Let's get to it and see how it's done! How to Remove Audio from Video using FFmpeg Many people want to know how to remove or delete the audio track from a video they've recorded. If you have a copy of FFmpeg installed on your computer, then you have just the tool to help you add or remove an audio track from your movie. FFmpeg is a super-powerful tool to add, remove, extract, or replace the audio in your video files.
0 kommentar(er)
