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mpegvideoparse: do not set delta unit flag on unknown frame type

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When encoding an image to mpeg2 video, with something like:
  gst-launch-1.0 encodebin name=e profile=mpegpsmux:video/mpeg,mpegversion=2,systemstream=false ! \
                 filesink location=sample.mpg filesrc num-buffers=1 blocksize=$(stat -c%s sample.png) \
                 location=sample/dts.png ! pngdec ! e.
The only frame's type is set to an invalid value 0
The consequence is that mpegvideoparse sets the delta unit flag on the buffer because
it is not an I frame, then decodebin3 drops this only frame because the delta
unit flag is set and the decoder receives eos before it was able to receive any
encoded data

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7832>
This commit is contained in:
Théo Maillart 2024-11-05 14:34:03 +01:00 committed by GStreamer Marge Bot
parent 986b91fbe9
commit a1c92c0cb1
1 changed files with 1 additions and 1 deletions
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2
subprojects/gst-plugins-bad/gst/videoparsers/gstmpegvideoparse.c
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@ -931,7 +931,7 @@ gst_mpegv_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
if (G_UNLIKELY (mpvparse->pichdr.pic_type == GST_MPEG_VIDEO_PICTURE_TYPE_I))
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
else
else if (mpvparse->pichdr.pic_type != 0)
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
/* maybe only sequence in this buffer, though not recommended,