Thank you for the reply. I am pretty sure I have a working vaapih264dec element since I can setup a pipeline manually to play a H.264 video. Also, the output of remote-viewer with --spice-debug is almost the same as yours(vaapidecodebin, vaapih264dec).
>> Couldn't set vaapidecodebin0 to PAUSEDElement vaapidecode_h264-0 does not accept caps
The last line of the log says vaapidecode_h264 dose not accept caps. Is there any possibility that my hardware(intel i5-6500) can't decode some H.264 stream with certain parameter (as the default x264enc setup generate) since I can confirm playbin is using vaapih264dec when I manually change the encoder of spice-server from x264 to vaapih264enc (still has a jamed pipeline). Can you provides some hardware known to work?
On Fri, Aug 3, 2018 at 5:03 PM, Victor Toso <victortoso@xxxxxxxxxx& gt; wrote:
Hi, On Fri, Aug 03, 2018 at 11:20:52AM +0800, Qiu Wenbo wrote:I'm trying to turn on streaming video with H.264 codec manually. I have noticed spice-gtk will use playbin to decode the video stream with recent gstreamer.YesHowever, playbin tends to use software decoder (avdec_h264) on my box (latest Archlinux running on an Intel i5-6500 PC with gstreamer-vaapi). When I remove gstreamer-libav, gstreamer complains like this and refuse to setup pipeline:What is the output of $ gst-inspect-1.0 | grep -i vaapi Note that with --spice-debug enabled you should be seeing something like | Spice-DEBUG: 10:52:22.453: channel-display-gst.c:696: | gstvideo_debug_available_decoders: From 15 video decoder elements, | 1 can handle caps image/jpeg: jpegdec | Spice-DEBUG: 10:52:22.453: channel-display-gst.c:696: | gstvideo_debug_available_decoders: From 15 video decoder elements, | 2 can handle caps video/x-vp8: vaapidecodebin, vp8dec | Spice-DEBUG: 10:52:22.453: channel-display-gst.c:696: | gstvideo_debug_available_decoders: From 15 video decoder elements, | 1 can handle caps video/x-h264: vaapidecodebin | Spice-DEBUG: 10:52:22.453: channel-display-gst.c:696: | gstvideo_debug_available_decoders: From 15 video decoder elements, | 2 can handle caps video/x-vp9: vaapidecodebin, vp9dec This debug info is similar to running gst-inspect-1.0 and finding the decoder elements per codec supported in spice-protocol0:00:00.221423602 4816 0x7f24e40454a0 ERROR h264parse gsth264parse.c:2588:gst_h264_parse_set_caps: video/x-h264 caps without codec_data or stream-format 0:00:00.221548091 4816 0x7f24e40454a0 ERROR h264parse gsth264parse.c:2588:gst_h264_parse_set_caps: video/x-h264 caps without codec_data or stream-formatstream-format is not needed to play the stream and we lack a way to set this info reliably in the procotol (the host is hardcded to stream with byte-stream but could change, etc) See https://gitlab.freedesktop.org/spice/spice-gtk/commit/c9129ed202b00f40:00:00.517686292 4816 0x7f24e40454a0 WARN decodebin gstdecodebin2.c:2514:connect_pad:<decodebin0> Couldn't set vaapidecodebin0 to PAUSED 0:00:00.518742010 4816 0x7f24e40454a0 WARN decodebin gstdecodebin2.c:2339:connect_pad:<decodebin0> Element vaapidecode_h264-0 does not accept caps 0:00:00.518908940 4816 0x7f24e40454a0 WARN uridecodebin gsturidecodebin.c:921:unknown_type_cb:<uridecodebin0> warning: No decoder available for type 'video/x-h264, pixel-aspect-ratio=(fraction)1/1, width=(int)1920, height=(int)1080, framerate=(fraction)30/1, interlace-mode=(string)progressive, chroma-format=(string)4:4:4, bit-depth-luma=(uint)8, bit-depth-chroma=(uint)8, parsed=(boolean)true, stream-format=(string)avc, alignment=(string)au, profile="" level=(string)5, codec_data=(buffer)01f40032ffe1001e67f400329184680780227e27016a02020280000003008000001e478c195001000468ce3192'. 0:00:00.518933285 4816 0x7f24e40454a0 WARN decodebin gstdecodebin2.c:4640:gst_decode_bin_expose:<decodebin0> error: no suitable plugins found: Couldn't set vaapidecodebin0 to PAUSEDElement vaapidecode_h264-0 does not accept caps"No decoder available" and "No plugins found", that's why I asked above questions. Besides having gstreamer1-vaapi, you need suitable drivers to make vaapi work0:00:00.518951522 4816 0x7f24e40454a0 WARN uridecodebin gsturidecodebin.c:988:no_more_pads_full:<uridecodebin0> error: no suitable plugins found: gstdecodebin2.c(4640): gst_decode_bin_expose (): /GstPlayBin:playbin/GstURIDecodeBin:uridecodebin0/GstDecodeBin:decodebin0: no suitable plugins found: Couldn't set vaapidecodebin0 to PAUSEDElement vaapidecode_h264-0 does not accept caps However, after install gstreamer-libav, the log shows playbin is using avdec_h264. Also, I can confirm playbin is using vaapih264dec when I manually change the encoder of spice-server from x264 to vaapih264enc.Cheers,
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