So, keeping in mind that you can have a fixed size for the videos, we will proceed with the following task that will be resizing both videos to a common size. FFmpeg offers the hstack filter to stack horizontally the videos, the only requirement is that both videos need to have the same dimensions (height and width). The other option is not for everyone though, however, it is useful as well under certain conditions. The canvas is quite big as you can see, with almost a 4K resolution, just to preserve the aspect ratio. The output video in this case will have the following layout:
right-video.mp4 -filter_complex "scale2ref='oh*mdar':'if(lt(main_h,ih),ih,main_h)' scale2ref='oh*mdar':'if(lt(main_h,ih),ih,main_h)' amerge=inputs=2 hstack,setsar=1" -map "" -ac 2. The full command to stack both videos using the filter is: ffmpeg -i. The second video stream will be scaled to match the main video. scale2ref also supports the following additional constants for the 'w' and 'h' options:įor the main input video's sample aspect ratio: scale2ref supports the same but uses the reference video instead of the main input as the basis. The scale2ref method scales or resizes the input video based on a reference video. The custom filter will be: scale2ref='oh*mdar':'if(lt(main_h,ih),ih,main_h)' The command will receive the 2 videos as input and will use a complex filter that needs to be replaced. right-side-video.mp4 -filter_complex "" -map "" -ac 2. The command to do the trick will be the following one: ffmpeg -i. The first option to stack the videos horizontally will be through a complex filter. In this article, I will explain to you how to stack 2 videos with different resolution horizontally using FFmpeg. The idea is to place them in a single video stacked horizontally, while the final video keeps the audio of both as well. As both of them have different cameras that record at a different resolution, both videos have different dimensions: For this article, we will work with these 2 videos recorded from a web camera stream, one from a teacher and the other from a student. However, in practice, there will be cases where the videos won't have the same dimensions. This filter allows you to create easily build a mosaic from many videos as long as they have the same resolution. Stacking videos horizontally is easy according to the documentation of FFmpeg using the hstack filter.
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