Synchronizing subtitles with video playback is crucial for an optimal viewing experience, especially when dealing with foreign language films or accessibility needs. While the topic of "sincronização de legendas" (subtitle synchronization) is generally applicable across various platforms, this article will focus on how to achieve this on macOS, leveraging tools and applications available within the Apple ecosystem.

macOS provides several methods to synchronize subtitles, including built-in tools like QuickTime Player, third-party applications such as VLC Media Player, and command-line utilities for advanced users. This article will guide you through these methods, ensuring your subtitles are perfectly timed with your video content.

Examples:

Using QuickTime Player

QuickTime Player is a built-in application on macOS that supports subtitle synchronization. Here’s how to adjust subtitles using QuickTime Player:

1. Open QuickTime Player: Launch QuickTime Player from your Applications folder.
2. Open the Video File: Go to File > Open File and select your video.
3. Add Subtitles: Go to View > Subtitles and select the subtitle file (usually in .srt format).
4. Adjust Subtitle Timing: Unfortunately, QuickTime Player does not provide direct subtitle timing adjustments. For precise control, consider using a third-party application like VLC Media Player.

Using VLC Media Player

VLC Media Player is a versatile, open-source media player that offers extensive subtitle synchronization features. Here’s how to synchronize subtitles with VLC:

1. Download and Install VLC: Download VLC from the official website (https://www.videolan.org) and install it on your macOS.
2. Open VLC: Launch VLC Media Player.
3. Open the Video File: Go to File > Open File and select your video.
4. Load Subtitles: Go to Subtitle > Add Subtitle File and select your subtitle file.
5. Synchronize Subtitles: Use the keyboard shortcuts G and H to delay or advance the subtitles respectively. Each press adjusts the timing by 50 milliseconds.
6. Fine-Tune Synchronization: Continue adjusting until the subtitles match the dialogue perfectly.

Using Command-Line Tools

For advanced users, command-line tools like ffmpeg can be used to synchronize subtitles. Here’s an example:

1. Install ffmpeg: If you don’t have ffmpeg installed, you can install it using Homebrew:

   brew install ffmpeg

2. Synchronize Subtitles: Use the following command to shift subtitles by a specific amount of time (e.g., 5 seconds):

   ffmpeg -i input.srt -ss 5 output.srt

   Replace input.srt with your subtitle file and adjust the -ss value as needed.