video_codec: default define by dict

This helps transition to H.265 without user needing to think about it

Author: scivision

README.md

@@ -279,6 +279,7 @@ DirectShow didn't seem to work on Windows, so we used gdigrab instead.
 
 * [YouTube Live parameters](https://support.google.com/youtube/answer/2853702)
 * [Facebook Live parameters](https://www.facebook.com/business/help/162540111070395)
+* [Owncast parameters](https://owncast.online/docs/codecs/)
 * [IBM Cloud Video parameters](https://support.video.ibm.com/hc/en-us/articles/207852117-Internet-connection-and-recommended-encoding-settings)
 * [Vimeo](https://help.vimeo.com/hc/en-us/articles/12426924775953-Encoder-guide)
 

src/pylivestream/data/pylivestream.json

@@ -7,7 +7,6 @@
   "audio_rate": 44100,
   "audio_bps": 128000,
   "preset": "veryfast",
-  "video_codec": "libx264",
   "audio_codec": "aac",
   "exe": "ffmpeg",
   "ffprobe_exe": "ffprobe",

src/pylivestream/stream.py

@@ -23,6 +23,29 @@
 FPS: float = 30.0  # default frames/sec if not defined otherwise
 
 
+def get_video_codec(site: str) -> str:
+    """
+    Get the suggested video codec for a given site.
+
+    YouTube: https://support.google.com/youtube/answer/2853702
+    Facebook: https://www.facebook.com/business/help/162540111070395
+    Owncast: https://owncast.online/docs/codecs/
+    Twitch: https://www.facebook.com/business/help/162540111070395
+    Vimeo: https://help.vimeo.com/hc/en-us/articles/12426924775953-Encoder-guide
+    """
+
+    video_codecs = {
+        "youtube": "libx265",
+        "facebook": "libx264",
+        "owncast": "libx264",
+        "twitch": "libx264",
+        "vimeo": "libx264",
+        "default": "libx264",
+    }
+
+    return video_codecs.get(site, video_codecs["default"])
+
+
 # %% top level
 class Stream:
     def __init__(self, inifn: Path, site: str, **kwargs):
@@ -116,7 +139,7 @@ def osparam(self, fn: Path) -> None:
         self.hcam: str = syscfg.get("hcam")
 
         # H.265 suggested by YouTube, but not yet by Facebook.
-        self.video_codec = C.get("video_codec", "libx264")
+        self.video_codec = C.get("video_codec", get_video_codec(self.site))
 
         self.audio_codec = C.get("audio_codec")
         self.video_format = syscfg.get("video_format")