Add Hybrid MOV (mov_output) recording format support

[hanatyan128]

Summary

Add support for the Hybrid MOV recording format (mov_output), which was introduced in OBS Studio 32.0.0 (commit 5f2a4e97, 2024-12-29).

OBS Studio currently supports the following native (in-process) muxer output types for crash-resilient recording:

Format	Output type	Since
Hybrid MP4	mp4_output	OBS 30.2.0
Hybrid MOV	mov_output	OBS 32.0.0

Branch Output already supports hybrid_mp4 via mp4_output, but does not yet offer hybrid_mov via mov_output.

Motivation

Both Hybrid MP4 and Hybrid MOV write fragmented MP4/MOV in-process (no external obs-ffmpeg-mux.exe subprocess). This provides significantly better crash resilience compared to the current fragmented_mp4 / fragmented_mov formats, which rely on ffmpeg_muxer and an external mux process.

When OBS crashes while recording:

• ffmpeg_muxer (fragmented_mp4/mov): The external mux process may or may not finalize the file depending on timing — recordings can be lost.
• mp4_output / mov_output (hybrid_mp4/mov): Fragments are written directly to disk from the OBS process. The file remains playable up to the last completed fragment.

A user has reported losing Branch Output recordings on crash while using fragmented_mp4, even though OBS's own recording (also using ffmpeg_muxer) survived.

Proposed Changes

1. Recording output type selection (plugin-stream-recording.cpp)

Current:

const char *outputId = !strcmp(recFormat, "hybrid_mp4") ? "mp4_output" : "ffmpeg_muxer";

Proposed:

const char *outputId = "ffmpeg_muxer";
if (!strcmp(recFormat, "hybrid_mp4"))
    outputId = "mp4_output";
else if (!strcmp(recFormat, "hybrid_mov"))
    outputId = "mov_output";

2. UI format list (plugin-ui.cpp)

Add hybrid_mov to the recording format list:

obs_property_list_add_string(fileFormatList, obs_module_text("hMOV"), "hybrid_mov");

Consider also adding it to the replay buffer format list.

3. File extension mapping (utils.cpp)

Add hybrid_mov → .mov mapping.

4. Locale strings

Add hMOV key to all locale files.

5. Runtime compatibility

Since mov_output is only available in OBS ≥ 32.0.0, consider:

• Runtime check: attempt obs_output_create("mov_output", ...) and handle failure gracefully, OR
• Only show the hybrid_mov option in the UI when the output type is available (via obs_get_output_type_info("mov_output") or similar)

Reference

• OBS commit (Hybrid MOV): 5f2a4e976f9556799fbecdcbaf07ddf163350b5c
• OBS commit (Hybrid MP4 / native muxer): df2a75fe4b7512ed7ce11f098f999a03c49e00dd
• OBS mp4_output / mov_output definitions: plugins/obs-outputs/mp4-output.c