[embedsubtitle] Keep original subtitle after conversion if write_subtitles given

Closes: https://github.com/pukkandan/yt-dlp/issues/57#issuecomment-775227745

:ci skip dl

1 files changed, 6 insertions, 1 deletions

diff --git a/youtube_dlc/postprocessor/ffmpeg.py b/youtube_dlc/postprocessor/ffmpeg.py
index 948c34287..cabe7266e 100644
--- a/youtube_dlc/postprocessor/ffmpeg.py
+++ b/youtube_dlc/postprocessor/ffmpeg.py
@@ -442,6 +442,10 @@ class FFmpegVideoConvertorPP(FFmpegPostProcessor):
 
 
 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
+    def __init__(self, downloader=None, already_have_subtitle=False):
+        super(FFmpegEmbedSubtitlePP, self).__init__(downloader)
+        self._already_have_subtitle = already_have_subtitle
+
     def run(self, information):
         if information['ext'] not in ('mp4', 'webm', 'mkv'):
             self.to_screen('Subtitles can only be embedded in mp4, webm or mkv files')
@@ -501,7 +505,8 @@ class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
         os.remove(encodeFilename(filename))
         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
 
-        return sub_filenames, information
+        files_to_delete = [] if self._already_have_subtitle else sub_filenames
+        return files_to_delete, information
 
 
 class FFmpegMetadataPP(FFmpegPostProcessor):