vaapidecodebin (h264) and change resolution.

[Víctor Jáquez]

On Thu, 10 Aug 2017 at 21:13, Matteo Valdina wrote:
> Hi y'all,
> 
> I create a prototype that encode a video stream and sends RTP to the
> network.
> The other side is receiving the RTP stream and decode.
> 
> My problem is when the encoded stream changes the resolution.
> vaapidecodebin (h264) decode a corrupted stream. The corrupted frame is
> first couples line some colors and the rest is green.

It sounds like a bug too.

> I noticed in logs that when h264parse sense the resolution changes the
> vaapidecode change src caps with old width and height:
> 
> 0:00:11.141138375 16310      0x11594f0 INFO               GST_EVENT
> gstevent.c:809:gst_event_new_caps: creating caps event video/x-h264,
> stream-format=(string)avc, alignment=(string)au,
> codec_data=(buffer)01640028ffe1002a67640028ac3c4201e0089797ff0001000110000003001000000303ce00000302dc6c000089545bdef72801000568ee01070c,
> level=(string)4, profile=(string)high, pixel-aspect-ratio=(fraction)1/1,
> width=(int)1920, height=(int)1080, framerate=(fraction)30/1,
> interlace-mode=(string)progressive, parsed=(boolean)true
> 0:00:11.143496386 16310      0x11594f0 INFO             vaapidecode
> gstvaapidecode.c:208:gst_vaapidecode_update_sink_caps:<decoder-bin-0> new
> sink caps = video/x-h264, stream-format=(string)avc, alignment=(string)au,
> codec_data=(buffer)01640028ffe1002a67640028ac3c4201e0089797ff0001000110000003001000000303ce00000302dc6c000089545bdef72801000568ee01070c,
> level=(string)4, profile=(string)high, pixel-aspect-ratio=(fraction)1/1,
> width=(int)1920, height=(int)1080, framerate=(fraction)30/1,
> interlace-mode=(string)progressive, parsed=(boolean)true
> 0:00:11.145759769 16310      0x11594f0 INFO               h264parse
> gsth264parse.c:1850:gst_h264_parse_update_src_caps:<h264-parse-dec-0> PAR
> 1/1
> 0:00:11.145988562 16310      0x11594f0 INFO               baseparse
> gstbaseparse.c:3986:gst_base_parse_set_latency:<h264-parse-dec-0> min/max
> latency 0:00:00.033333333, 0:00:00.033333333
> 0:00:11.150561630 16310      0x11594f0 INFO             vaapidecode
> gstvaapidecode.c:373:gst_vaapidecode_update_src_caps:<decoder-bin-0> new
> src caps = video/x-raw(memory:VASurface), format=(string)NV12,
> width=(int)1280, height=(int)720, interlace-mode=(string)progressive,
> multiview-mode=(string)mono,
> multiview-flags=(GstVideoMultiviewFlagsSet)0:ffffffff:/right-view-first/left-flipped/left-flopped/right-flipped/right-flopped/half-aspect/mixed-mono,
> pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)30/1

Please open a bug, and provide a test app if it is possible. Perhaps we are
forgetting to execute a drain the decoder before changing the caps.

vmjl