Streaming the screen of a Mac to a television without cables or additional boxes remains a puzzle for many macOS users. JustStream is an application that promises to solve this problem by combining screen mirroring and media playback to devices compatible with AirPlay, Chromecast, or DLNA. How does this solution really compare to the native and third-party alternatives available on Mac?
Broadcast Protocol Compatibility on Mac: JustStream vs. Alternatives
The choice of a streaming application primarily depends on the protocols it supports. Not all smart TVs adhere to the same standard, and an application limited to AirPlay effectively excludes a large portion of the Smart TV market running on Android TV or Tizen.
| Criterion | JustStream | Native AirPlay (macOS) | Other third-party apps (like Mirror for Samsung) |
|---|---|---|---|
| Supported Protocols | AirPlay, Chromecast, DLNA | AirPlay only | Variable (often only one protocol) |
| On-the-fly Transcoding | Yes | No | Rarely |
| Accepted Video Formats | AVI, MKV, FLV, MP4, MOV, WMV, 3GP | Mainly MP4, MOV | MP4, MOV |
| External Subtitles | Yes (SRT, ASS, SSA) | No | Partial |
| Required System | macOS only | macOS | macOS or Windows depending on the app |
The simultaneous support of AirPlay, Chromecast, and DLNA by JustStream is its most significant advantage. A Mac user with a Samsung TV (Tizen, DLNA compatible) and a Chromecast in another room can use the same application without juggling multiple tools.
For everything you need to know about JustStream with Vox Libris, the detailed operation of each protocol is described along with associated use cases.
Real-time Video Transcoding: The Technical Point that Differentiates JustStream
Most smart TVs only accept a handful of video codecs. Sending an HEVC-encoded MKV file to a first-generation Chromecast generally results in a black screen or choppy playback.
JustStream converts the video stream on the fly without the user needing to pre-encode the file. This transcoding also works on Apple Silicon Macs, where native M1/M2 support reduces the processor load compared to older Intel Macs.
Native AirPlay offers nothing comparable. If the file format is not recognized by the Apple TV or the AirPlay-compatible TV, the streaming fails. The user then has to go through a third-party player (VLC, Elmedia Player) or convert the file upstream with HandBrake or FFmpeg.
Supported Formats and Limitations
JustStream claims compatibility with AVI, FLV, MKV, 3GP, MP4, MOV, WMV for video, and MP3 and WAV for audio. This list covers the vast majority of files found on a hard drive or a home NAS.
- MKV with multiple audio tracks: JustStream allows you to select the audio track and subtitle track before streaming, eliminating the need to remux the file.
- External subtitles in SRT, ASS, or SSA format are loaded automatically if they share the same name as the video file, or manually via the interface.
- Files protected by DRM (iTunes Store, for example) cannot be streamed: the protection blocks transcoding just like on any third-party application.
Screen Mirroring from Mac to TV: Settings and Quality
The mirroring function of JustStream duplicates the entire screen of the Mac onto the television. This mode is useful for both professional presentations and for displaying a web browser, a video conference, or editing software on a large screen.
The mouse cursor remains visible during mirroring, which may seem trivial but is missing in some competing solutions. For a presentation in a meeting room, losing the cursor forces you to guess where you are clicking.
Available Quality Settings
The application offers the ability to adjust the resolution and framerate of the stream sent to the television. Reducing quality improves smoothness on congested Wi-Fi networks. Increasing the resolution takes advantage of 4K TVs but requires sufficient local bandwidth.
However, latency remains noticeable during mirroring, regardless of the protocol used. For gaming or audio editing that requires precise lip-syncing, a wired connection (HDMI) remains more reliable. Wireless mirroring is better suited for web browsing, slideshows, and playback of pre-recorded content.
Live Streaming and Legal Obligations in 2026 for Broadcasters
The interest in live streaming goes far beyond simply broadcasting local files. Content creators, businesses, and associations use live tools for their events, training, or business partnerships.
Since 2026, live streams that include commercial partnerships are subject to stricter rules. The mention of the partnership must be simultaneously visible and audible throughout the sponsored segment, in the form of a readable graphic overlay and a verbal announcement. The live text must also contain an explicit mention such as “Contains a commercial partnership.”
Sanctions can include a suspension of 7 to 30 days and a fine of up to 300,000 euros for professional streamers in case of repeat offenses. These constraints apply to all live broadcasting tools, not just JustStream.
- Every professional streamer must ensure that their broadcasting software allows for a permanent overlay during sponsored segments.
- Compliance with the DSA also requires moderating the chat in real-time, which necessitates additional tools (chatbot, human moderators).
- Content broadcasters must ensure they hold the broadcasting rights, including for drone captures.
JustStream, as a casting and mirroring application, does not natively manage these regulatory aspects. A professional broadcaster will need to combine JustStream with an encoder or software switcher capable of adding overlays and managing moderation.
Ultimately, the choice of a streaming tool for Mac depends on the use case. To stream local video files to a television without worrying about codecs, JustStream fulfills its role with a versatility of protocols that macOS alone does not offer. For professional live streaming subject to new obligations, the application remains a link in the chain, not a standalone solution.