![]() The "Open Video" button is used to load a video. The interface is a bit different, but the program is quite user-friendly. Further tests which included SD, smaller HD videos resulted in faster merging speeds and lower CPU usage. Do note that these were done with multiple applications running in the background. ![]() When I merged two short 4K videos it took over a minute and a half, merging 720p videos (about 768MB) took nearly 10 minutes and the CPU usage was quite high. The time taken for the merging process to complete depends on the video's resolution and size. The selected video files are re-encoded and saved as one video. Clicking save begins the media merging process. Hit the "Join" button on the toolbar and MP4Joiner will open a save dialog box prompting you to choose the video's name and location. You can use it to set the audio bitrate, sample rate, video constant rate factor, preset, etc. Click the options button at the top to modify the output settings. Observe the status bar and you'll see that I have cut one of the videos, so the output video is shorter and its file size is correspondingly smaller. The statusbar at the bottom of the interface shows you what the total duration and size of the output video will be. The video won't be cut immediately, but the change will be processed during the merge operation. This tool is very easy to use, just the start and end time positions and click ok. Using it allows you to use the built-in video cutter. ![]() Right-click on a video to remove or sort it, but more importantly it has a "Cut Video" option. Use the arrow buttons towards the right edge of the screen to re-order the videos. This includes the video's path, duration, size, codec, resolution and aspect ratio. One you add some videos to be merged, you will see the media information in the large blank pane below the toolbar. Despite being called MP4Joiner, the program does support a few additional video formats: MP4, M4V, TS, AVI and MOV. The application has a toolbar at the top that lets you add or remove videos from the queue. MP4Joiner can join (or merge) two or more videos into a single MP4 file. It comes with two independent modules: MP4Joiner and MP4Splitter. If you're interested in creating your own special videos with subtitles, you can give this tool a spin.MP4Tools does precisely that. Instead of a subtitle merger, Kapwing works more like a subtitle maker that supports MP4, MOV, WebM, OGG and MPEG files, and allows you to create/write your own subtitle, fine-tune your subtitle file, for instance, change text position, background, size, adjust the timestamp of subtitles, etc. Major platforms are supported and you're able to search for subtitles for displaying or load your own subtitle files. Therefore, users can easily get the gist of different types of video content. Substital is a special extension for both Chrome and Firefox, which offers users a handy way to add subtitles or closed captions to videos online. For uploading large videos, one needs to upgrade to the Pro plan. Veed supports MOV, MP4, AVI and more formats yet its free plan only permits users to upload maximum 50 MB file size. Meanwhile, there is a wide range of subtitle styles you can apply. Veed can both merge a local subtitle file and make a subtitle by means of its generated subtitle tool. In case that you seldom need to merge subtitles with a video and prefer online methods, we have rounded up several online subtitle mergers for you.
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