Make converter output seekable WEBM (#2)

sgfn · web-flow · commit 2a42782902b3 · 2025-05-14T12:03:23.000+02:00
diff --git a/lib/ex_webrtc_recorder/converter/ffmpeg.ex b/lib/ex_webrtc_recorder/converter/ffmpeg.ex
@@ -17,7 +17,8 @@ defmodule ExWebRTC.Recorder.Converter.FFmpeg do
     {_io, 0} =
       System.cmd(
         "ffmpeg",
-        ~w(-ss #{video_start_time} -i #{video_file} -ss #{audio_start_time} -i #{audio_file} -c:v copy -c:a copy -shortest #{output_file}),
+        # FIXME: we're assuming a lot here
+        ~w(-ss #{video_start_time} -i #{video_file} -ss #{audio_start_time} -i #{audio_file} -c:v vp8 -threads 8 -b:v 1.5M -cues_to_front 1 -g 150 -c:a copy -shortest #{output_file}),
         stderr_to_stdout: true
       )
 

Original file line number	Diff line number	Diff line change
`@@ -17,7 +17,8 @@ defmodule ExWebRTC.Recorder.Converter.FFmpeg do`
`17`	`17`	`{_io, 0} =`
`18`	`18`	`System.cmd(`
`19`	`19`	`"ffmpeg",`
`20`		`- ~w(-ss #{video_start_time} -i #{video_file} -ss #{audio_start_time} -i #{audio_file} -c:v copy -c:a copy -shortest #{output_file}),`
	`20`	`+ # FIXME: we're assuming a lot here`
	`21`	`+ ~w(-ss #{video_start_time} -i #{video_file} -ss #{audio_start_time} -i #{audio_file} -c:v vp8 -threads 8 -b:v 1.5M -cues_to_front 1 -g 150 -c:a copy -shortest #{output_file}),`
`21`	`22`	`stderr_to_stdout: true`
`22`	`23`	`)`
`23`	`24`