[FFmpegSubtitlesConvertorPP] fix not working when srt is used as the intermediate format between ttml/dfxp and other format

It was trying to use the ttml/dfxp file with ffmpeg, which doesn't have support for them. I broke it in e04398e397.
2016-02-06 18:51:05 +01:00 · 2016-02-06 18:51:05 +01:00 · 7e62c2eb6d
commit 7e62c2eb6d
parent 56401e1e5f
1 changed files with 1 additions and 0 deletions
--- a/youtube_dl/postprocessor/ffmpeg.py
+++ b/youtube_dl/postprocessor/ffmpeg.py
@ -508,6 +508,7 @@ class FFmpegSubtitlesConvertorPP(FFmpegPostProcessor):

                with io.open(srt_file, 'wt', encoding='utf-8') as f:
                    f.write(srt_data)
+                old_file = srt_file

                ext = 'srt'
                subs[lang] = {