"Can I merge multiple videos together with an alternate playback pipeline to create a seamless, single video stream?"

The ffmpeg tool can be used to combine two videos with different frame rates into a single video stream using the concat demuxer.

The concat demuxer can preserve the quality of the main video while combining the two videos.

The concat filter in ffmpeg will re-encode all inputs, whereas the concat demuxer does not.

The moviepy library in Python can also be used to concatenate video clips and merge them into a single video.

The concatenate\_videoclips function from moviepy.editor can be used to combine a list of video files.

Picture-in-picture (PIP) videos can be created by merging two videos using video editing software or online tools.

Adobe Premiere Pro, Final Cut Pro, iMovie, Kapwing, and Clideo are some of the tools and software that can be used to create PIP videos.

The size, format, frame rate, resolution, quality, and path folder of the PIP video can be adjusted using these tools and software.

In ffmpeg, the filtercomplex option can be used to define a filtergraph that overlays the PiP video on the main video at a specific location.

The ffmpeg command used to merge two videos with PIP involves specifying the main video, PiP video, and the filtergraph for overlapping them.

The main video and PiP video can be scaled, cropped, rotated, and have filters applied using ffmpeg.

The output video format, frame rate, resolution, quality, and path folder can be adjusted in ffmpeg using various options.

Online tools like Kapwing and Clideo can also be used to create PIP videos by uploading the videos and adjusting the settings.

These online tools also provide the option to add text, images, and other media elements to the PIP video.

The resulting PIP video can be downloaded and shared on social media platforms or embedded on websites.

The audio streams of the two videos can also be merged using ffmpeg, by using the concat demuxer or the amix filter.

The audio streams can be adjusted for volume, speed, pitch, and other settings using ffmpeg.

The audio format, sample rate, and bit depth can be adjusted using the appropriate options in ffmpeg.

The resulting merged video and audio streams can be muxed into a single file using ffmpeg.

The resulting file can be played on various media players and platforms that support the output format and settings.