v0.3.1

tests/support/ffx_bundle.py

@@ -7,6 +7,7 @@ import os
 from pathlib import Path
 import subprocess
 import sys
+from functools import lru_cache
 from typing import Mapping
 
 
@@ -95,6 +96,45 @@ def write_vtt(path: Path, lines: tuple[str, ...]) -> Path:
     return path
 
 
+@lru_cache(maxsize=None)
+def _ffmpeg_encoder_is_available(encoder_name: str) -> bool:
+    completed = subprocess.run(
+        ["ffmpeg", "-encoders"],
+        capture_output=True,
+        text=True,
+    )
+    if completed.returncode != 0:
+        return False
+
+    encoder_label = str(encoder_name).strip()
+    for line in completed.stdout.splitlines():
+        if not line.startswith(" "):
+            continue
+
+        tokens = line.split(maxsplit=2)
+        if len(tokens) >= 2 and tokens[1] == encoder_label:
+            return True
+
+    return False
+
+
+def _resolve_fixture_video_encoder(
+    video_encoder: str,
+    video_encoder_options: tuple[str, ...],
+) -> tuple[str, tuple[str, ...]]:
+    if video_encoder != "libx264":
+        return video_encoder, video_encoder_options
+
+    if _ffmpeg_encoder_is_available("libx264"):
+        return video_encoder, video_encoder_options
+
+    if _ffmpeg_encoder_is_available("libopenh264"):
+        # Keep fixture generation software-based when libx264 is missing.
+        return "libopenh264", ("-pix_fmt", "yuv420p")
+
+    return video_encoder, video_encoder_options
+
+
 def create_source_fixture(
     workdir: Path,
     filename: str,
@@ -115,6 +155,10 @@ def create_source_fixture(
     subtitle_encoder: str = "webvtt",
 ) -> Path:
     output_path = workdir / filename
+    video_encoder, video_encoder_options = _resolve_fixture_video_encoder(
+        video_encoder,
+        video_encoder_options,
+    )
 
     has_video = any(track.track_type == TrackType.VIDEO for track in tracks)
     has_audio = any(track.track_type == TrackType.AUDIO for track in tracks)