[YoutubeDL] store the subtitles to download in the 'requested_subtitles' field

We need to keep the orginal subtitles information, so that the '--load-info' option can be used to list or select the subtitles again.
We'll also be able to have a separate field for storing the automatic captions info.

1 files changed, 4 insertions, 3 deletions

diff --git a/youtube_dl/postprocessor/ffmpeg.py b/youtube_dl/postprocessor/ffmpeg.py
index d1bbfbfe3..e42298f0e 100644
--- a/youtube_dl/postprocessor/ffmpeg.py
+++ b/youtube_dl/postprocessor/ffmpeg.py
@@ -462,13 +462,14 @@ class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
         if information['ext'] != 'mp4':
             self._downloader.to_screen('[ffmpeg] Subtitles can only be embedded in mp4 files')
             return True, information
-        if not information.get('subtitles'):
+        subtitles = information.get('requested_subtitles')
+        if not subtitles:
             self._downloader.to_screen('[ffmpeg] There aren\'t any subtitles to embed')
             return True, information
 
-        sub_langs = [key for key in information['subtitles']]
+        sub_langs = list(subtitles.keys())
         filename = information['filepath']
-        input_files = [filename] + [subtitles_filename(filename, lang, sub_info['ext']) for lang, sub_info in information['subtitles'].items()]
+        input_files = [filename] + [subtitles_filename(filename, lang, sub_info['ext']) for lang, sub_info in subtitles.items()]
 
         opts = [
             '-map', '0',