[FFmpeg-cvslog] fftools/ffmpeg: Fix crash when flushing non-fully setup output stream

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Fri Oct  8 09:47:33 2021 +0200| [fb215798c7a72b32e889b72efd018f26bb3f88ce] | committer: Andreas Rheinhardt

fftools/ffmpeg: Fix crash when flushing non-fully setup output stream

The output stream's packet may not have been allocated
at that point. This happens when quitting in the following command line:
$ ./ffmpeg -lavfi abuffer=sample_fmt=u8:sample_rate=48000:channel_layout=stereo -f null -

Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fb215798c7a72b32e889b72efd018f26bb3f88ce
---

 fftools/ffmpeg.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index bb29e3cec5..0e38d6d185 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -1981,6 +1981,9 @@ static void flush_encoders(void)
             AVPacket *pkt = ost->pkt;
             int pkt_size;
 
+            if (!pkt)
+                break;
+
             switch (enc->codec_type) {
             case AVMEDIA_TYPE_AUDIO:
                 desc   = "audio";