GSTREAMER USB摄像机H264管道

Question

我遇到了创建GSTREAMER管道的问题，该管道从连接到我嵌入的Linux（稍微修改的Toradex Multimedia Image）开发板上的USB摄像机帧。我可以使用以下管道

GST-LAUNCH-1.0 -V V4L2SRC DEVICE =/dev/video2显示相机的提要！ v4l2jpegdec！但是

，如果我尝试执行简单的H264编码，则会收到以下错误（下面的完整日志）。据我所知，jpegdecoder的上限与H264编码器所需的盖子匹配。我不得不剪切日志文件，但是最后一行显示了错误，并且我删除了GST_STATES事件，因为这些事件似乎没有显示出任何有意义的事件。

root@apalis-imx8-06959030:~# GST_DEBUG=4 gst-launch-1.0 -v v4l2src device=/dev/video2 ! v4l2jpegdec ! v4l2h264enc ! v4l2h264dec ! autovideosink
0:00:00.000155372  2492 0xaaaadc3bf600 INFO                GST_INIT gst.c:586:init_pre: Initializing GStreamer Core Library version 1.16.2
0:00:00.000230120  2492 0xaaaadc3bf600 INFO                GST_INIT gst.c:587:init_pre: Using library installed in /usr/lib
0:00:00.000263869  2492 0xaaaadc3bf600 INFO                GST_INIT gst.c:605:init_pre: Linux apalis-imx8-06959030 5.4.154-5.5.0-devel+git.c65f1622951c #1 SMP PREEMPT Mon Jan 3 15:58:01 UTC 2022 aarch64
0:00:00.000773982  2492 0xaaaadc3bf600 INFO                GST_INIT gstmessage.c:128:_priv_gst_message_initialize: init messages
0:00:00.001962580  2492 0xaaaadc3bf600 INFO                GST_INIT gstcontext.c:84:_priv_gst_context_initialize: init contexts
0:00:00.002429820  2492 0xaaaadc3bf600 INFO      GST_PLUGIN_LOADING gstplugin.c:318:_priv_gst_plugin_initialize: registering 0 static plugins
0:00:00.002664189  2492 0xaaaadc3bf600 INFO      GST_PLUGIN_LOADING gstplugin.c:226:gst_plugin_register_static: registered static plugin "staticelements"
0:00:00.002700188  2492 0xaaaadc3bf600 INFO      GST_PLUGIN_LOADING gstplugin.c:228:gst_plugin_register_static: added static plugin "staticelements", result: 1
0:00:00.002752687  2492 0xaaaadc3bf600 INFO            GST_REGISTRY gstregistry.c:1720:ensure_current_registry: reading registry cache: /home/root/.cache/gstreamer-1.0/registry.aarch64.bin
0:00:00.061302350  2492 0xaaaadc3bf600 INFO            GST_REGISTRY gstregistrybinary.c:621:priv_gst_registry_binary_read_cache: loaded /home/root/.cache/gstreamer-1.0/registry.aarch64.bin in 0.058444 seconds
0:00:00.061605218  2492 0xaaaadc3bf600 INFO            GST_REGISTRY gstregistry.c:1579:scan_and_update_registry: Validating plugins from registry cache: /home/root/.cache/gstreamer-1.0/registry.aarch64.bin
0:00:00.072084354  2492 0xaaaadc3bf600 INFO            GST_REGISTRY gstregistry.c:1678:scan_and_update_registry: Registry cache has not changed
0:00:00.072151228  2492 0xaaaadc3bf600 INFO            GST_REGISTRY gstregistry.c:1755:ensure_current_registry: registry reading and updating done, result = 1
0:00:00.072186227  2492 0xaaaadc3bf600 INFO                GST_INIT gst.c:806:init_post: GLib runtime version: 2.62.6
0:00:00.072219726  2492 0xaaaadc3bf600 INFO                GST_INIT gst.c:808:init_post: GLib headers version: 2.62.6
0:00:00.072244726  2492 0xaaaadc3bf600 INFO                GST_INIT gst.c:810:init_post: initialized GStreamer successfully
0:00:00.072309849  2492 0xaaaadc3bf600 INFO            GST_PIPELINE gstparse.c:336:gst_parse_launch_full: parsing pipeline description 'v4l2src device=/dev/video2 ! v4l2jpegdec ! v4l2h264enc ! v4l2h264dec ! autovideosink '
0:00:00.467121835  2492 0xaaaadc3bf600 INFO      GST_PLUGIN_LOADING gstplugin.c:902:_priv_gst_plugin_load_file_for_registry: plugin "/usr/lib/gstreamer-1.0/libgstvideo4linux2.so" loaded
(...)
0:00:00.481494256  2492 0xaaaadc3bf600 INFO               GST_EVENT gstevent.c:1579:gst_event_new_reconfigure: creating reconfigure event
0:00:00.481706377  2492 0xaaaadc3bf600 INFO     GST_ELEMENT_FACTORY gstelementfactory.c:361:gst_element_factory_create: creating element "pipeline"
0:00:00.482190866  2492 0xaaaadc3bf600 INFO            GST_PIPELINE grammar.y:648:gst_parse_perform_link: linking some pad of GstV4l2Src named v4l2src0 to some pad of v4l2jpegdec named v4l2jpegdec0 (0/0) with caps "(NULL)"
0:00:00.482276239  2492 0xaaaadc3bf600 INFO        GST_ELEMENT_PADS gstutils.c:1771:gst_element_link_pads_full: trying to link element v4l2src0:(any) to element v4l2jpegdec0:(any)
0:00:00.482360987  2492 0xaaaadc3bf600 INFO                GST_PADS gstutils.c:1034:gst_pad_check_link: trying to link v4l2src0:src and v4l2jpegdec0:sink
0:00:00.482480984  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:4237:gst_pad_peer_query:<v4l2jpegdec0:src> pad has no peer
0:00:00.482790977  2492 0xaaaadc3bf600 INFO                GST_PADS gstutils.c:1587:prepare_link_maybe_ghosting: v4l2src0 and v4l2jpegdec0 in same bin, no need for ghost pads
0:00:00.482910974  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:2377:gst_pad_link_prepare: trying to link v4l2src0:src and v4l2jpegdec0:sink
0:00:00.483005222  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:4237:gst_pad_peer_query:<v4l2jpegdec0:src> pad has no peer
0:00:00.483142969  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:2585:gst_pad_link_full: linked v4l2src0:src and v4l2jpegdec0:sink, successful
0:00:00.483202092  2492 0xaaaadc3bf600 INFO               GST_EVENT gstevent.c:1579:gst_event_new_reconfigure: creating reconfigure event
0:00:00.483260716  2492 0xaaaadc3bf600 INFO               GST_EVENT gstpad.c:5812:gst_pad_send_event_unchecked:<v4l2src0:src> Received event on flushing pad. Discarding
0:00:00.483383338  2492 0xaaaadc3bf600 INFO            GST_PIPELINE grammar.y:648:gst_parse_perform_link: linking some pad of v4l2jpegdec named v4l2jpegdec0 to some pad of v4l2h264enc named v4l2h264enc0 (0/0) with caps "(NULL)"
0:00:00.483459962  2492 0xaaaadc3bf600 INFO        GST_ELEMENT_PADS gstutils.c:1771:gst_element_link_pads_full: trying to link element v4l2jpegdec0:(any) to element v4l2h264enc0:(any)
0:00:00.483539335  2492 0xaaaadc3bf600 INFO                GST_PADS gstutils.c:1034:gst_pad_check_link: trying to link v4l2jpegdec0:src and v4l2h264enc0:sink
0:00:00.483655457  2492 0xaaaadc3bf600 INFO                GST_PADS gstutils.c:1587:prepare_link_maybe_ghosting: v4l2jpegdec0 and v4l2h264enc0 in same bin, no need for ghost pads
0:00:00.483887827  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:2377:gst_pad_link_prepare: trying to link v4l2jpegdec0:src and v4l2h264enc0:sink
0:00:00.484000449  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:2585:gst_pad_link_full: linked v4l2jpegdec0:src and v4l2h264enc0:sink, successful
0:00:00.484058573  2492 0xaaaadc3bf600 INFO               GST_EVENT gstevent.c:1579:gst_event_new_reconfigure: creating reconfigure event
0:00:00.484117697  2492 0xaaaadc3bf600 INFO               GST_EVENT gstpad.c:5812:gst_pad_send_event_unchecked:<v4l2jpegdec0:src> Received event on flushing pad. Discarding
0:00:00.484235569  2492 0xaaaadc3bf600 INFO            GST_PIPELINE grammar.y:648:gst_parse_perform_link: linking some pad of v4l2h264enc named v4l2h264enc0 to some pad of v4l2h264dec named v4l2h264dec0 (0/0) with caps "(NULL)"
0:00:00.484312192  2492 0xaaaadc3bf600 INFO        GST_ELEMENT_PADS gstutils.c:1771:gst_element_link_pads_full: trying to link element v4l2h264enc0:(any) to element v4l2h264dec0:(any)
0:00:00.484390940  2492 0xaaaadc3bf600 INFO                GST_PADS gstutils.c:1034:gst_pad_check_link: trying to link v4l2h264enc0:src and v4l2h264dec0:sink
0:00:00.484480938  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:4237:gst_pad_peer_query:<v4l2h264dec0:src> pad has no peer
0:00:00.484623560  2492 0xaaaadc3bf600 INFO                GST_PADS gstutils.c:1587:prepare_link_maybe_ghosting: v4l2h264enc0 and v4l2h264dec0 in same bin, no need for ghost pads
0:00:00.484713933  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:2377:gst_pad_link_prepare: trying to link v4l2h264enc0:src and v4l2h264dec0:sink
0:00:00.484800306  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:4237:gst_pad_peer_query:<v4l2h264dec0:src> pad has no peer
0:00:00.485071675  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:2585:gst_pad_link_full: linked v4l2h264enc0:src and v4l2h264dec0:sink, successful
0:00:00.485132173  2492 0xaaaadc3bf600 INFO               GST_EVENT gstevent.c:1579:gst_event_new_reconfigure: creating reconfigure event
0:00:00.485191047  2492 0xaaaadc3bf600 INFO               GST_EVENT gstpad.c:5812:gst_pad_send_event_unchecked:<v4l2h264enc0:src> Received event on flushing pad. Discarding
0:00:00.485305419  2492 0xaaaadc3bf600 INFO            GST_PIPELINE grammar.y:648:gst_parse_perform_link: linking some pad of v4l2h264dec named v4l2h264dec0 to some pad of GstAutoVideoSink named autovideosink0 (0/0) with caps "(NULL)"
0:00:00.485444541  2492 0xaaaadc3bf600 INFO        GST_ELEMENT_PADS gstutils.c:1771:gst_element_link_pads_full: trying to link element v4l2h264dec0:(any) to element autovideosink0:(any)
0:00:00.485525289  2492 0xaaaadc3bf600 INFO                GST_PADS gstutils.c:1034:gst_pad_check_link: trying to link v4l2h264dec0:src and autovideosink0:sink
0:00:00.485644037  2492 0xaaaadc3bf600 INFO                GST_PADS gstutils.c:1587:prepare_link_maybe_ghosting: v4l2h264dec0 and autovideosink0 in same bin, no need for ghost pads
0:00:00.485734785  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:2377:gst_pad_link_prepare: trying to link v4l2h264dec0:src and autovideosink0:sink
0:00:00.485854907  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:2585:gst_pad_link_full: linked v4l2h264dec0:src and autovideosink0:sink, successful
0:00:00.486087902  2492 0xaaaadc3bf600 INFO               GST_EVENT gstevent.c:1579:gst_event_new_reconfigure: creating reconfigure event
0:00:00.486152900  2492 0xaaaadc3bf600 INFO               GST_EVENT gstpad.c:5812:gst_pad_send_event_unchecked:<v4l2h264dec0:src> Received event on flushing pad. Discarding
Setting pipeline to PAUSED ...
(...)
0:00:00.489583697  2492 0xaaaadc3bf600 INFO        GST_ELEMENT_PADS gstpad.c:2132:gst_pad_unlink: unlinking sink:proxypad0(0xaaaadc6260f0) and fake-video-sink:sink(0xaaaadc619220)
0:00:00.489664070  2492 0xaaaadc3bf600 INFO        GST_ELEMENT_PADS gstpad.c:2187:gst_pad_unlink: unlinked sink:proxypad0 and fake-video-sink:sink
0:00:00.489733818  2492 0xaaaadc3bf600 INFO           GST_PARENTAGE gstbin.c:1801:gst_bin_remove_func:<autovideosink0> removed child "fake-video-sink"
0:00:00.489839816  2492 0xaaaadc3bf600 INFO         GST_REFCOUNTING gstelement.c:3251:gst_element_dispose:<fake-video-sink> 0xaaaadc62e5f0 dispose
0:00:00.489907189  2492 0xaaaadc3bf600 INFO        GST_ELEMENT_PADS gstelement.c:784:gst_element_remove_pad:<fake-video-sink> removing pad 'sink'
0:00:00.489997937  2492 0xaaaadc3bf600 INFO         GST_REFCOUNTING gstelement.c:3296:gst_element_dispose:<fake-video-sink> 0xaaaadc62e5f0 parent class dispose
0:00:00.490067936  2492 0xaaaadc3bf600 INFO         GST_REFCOUNTING gstelement.c:3328:gst_element_finalize:<fake-video-sink> 0xaaaadc62e5f0 finalize
0:00:00.490137059  2492 0xaaaadc3bf600 INFO         GST_REFCOUNTING gstelement.c:3333:gst_element_finalize:<fake-video-sink> 0xaaaadc62e5f0 finalize parent
0:00:00.497457767  2492 0xaaaadc3bf600 INFO      GST_PLUGIN_LOADING gstplugin.c:902:_priv_gst_plugin_load_file_for_registry: plugin "/usr/lib/gstreamer-1.0/libgstwaylandsink.so" loaded
0:00:00.497574014  2492 0xaaaadc3bf600 INFO     GST_ELEMENT_FACTORY gstelementfactory.c:358:gst_element_factory_create: creating element "waylandsink" named "autovideosink0-actual-sink-wayland"
0:00:00.498246374  2492 0xaaaadc3bf600 INFO        GST_ELEMENT_PADS gstelement.c:668:gst_element_add_pad:<GstBaseSink@0xaaaadc6343e0> adding pad 'sink'
0:00:00.498384371  2492 0xaaaadc3bf600 INFO        GST_ELEMENT_PADS gstelement.c:915:gst_element_get_static_pad: found pad autovideosink0-actual-sink-wayland:sink
0:00:00.498631115  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:4237:gst_pad_peer_query:<autovideosink0-actual-sink-wayland:sink> pad has no peer
(...)
0:00:00.502424154  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:2377:gst_pad_link_prepare: trying to link sink:proxypad0 and autovideosink0-actual-sink-wayland:sink
0:00:00.502562400  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:2585:gst_pad_link_full: linked sink:proxypad0 and autovideosink0-actual-sink-wayland:sink, successful
0:00:00.502604774  2492 0xaaaadc3bf600 INFO               GST_EVENT gstevent.c:1579:gst_event_new_reconfigure: creating reconfigure event
(...)
0:00:00.505876325  2492 0xaaaadc3bf600 INFO                    v4l2 v4l2_calls.c:629:gst_v4l2_open:<v4l2h264dec0:sink> Opened device 'vpu B0' (/dev/video12) successfully
0:00:00.505952323  2492 0xaaaadc3bf600 INFO                    v4l2 v4l2_calls.c:735:gst_v4l2_dup:<v4l2h264dec0:src> Cloned device 'vpu B0' (/dev/video12) successfully
0:00:00.506098070  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1228:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink> got 15 format(s):
0:00:00.506149818  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   JPEG
0:00:00.506196067  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   M264
0:00:00.506241816  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   LOGO
0:00:00.506286440  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   XVID
0:00:00.506331439  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   HEVC
0:00:00.506375813  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   VP80
0:00:00.506420312  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   H263
0:00:00.506464436  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   SPK0
0:00:00.506509060  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   VP60
0:00:00.506552434  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   MPG4
0:00:00.506596183  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   AVS0
0:00:00.506639932  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   MPG2
0:00:00.506683931  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   VC1L
0:00:00.506727930  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   VC1G
0:00:00.506771929  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264dec0:sink>   H264
0:00:00.506953050  2492 0xaaaadc3bf600 WARN                    v4l2 gstv4l2object.c:2031:gst_v4l2_object_get_interlace_mode: Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git

0:00:00.506999299  2492 0xaaaadc3bf600 WARN                    v4l2 gstv4l2object.c:2031:gst_v4l2_object_get_interlace_mode: Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git

0:00:00.507306667  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:4458:gst_v4l2_object_probe_caps:<v4l2h264dec0:sink> probed caps: video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], colorimetry=(string){ bt709 }, parsed=(boolean)true
(...)
0:00:00.508503890  2492 0xaaaadc3bf600 INFO                    v4l2 v4l2_calls.c:629:gst_v4l2_open:<v4l2h264enc0:sink> Opened device 'vpu encoder' (/dev/video13) successfully
0:00:00.508571513  2492 0xaaaadc3bf600 INFO                    v4l2 v4l2_calls.c:735:gst_v4l2_dup:<v4l2h264enc0:src> Cloned device 'vpu encoder' (/dev/video13) successfully
(...)
0:00:00.509007878  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:4458:gst_v4l2_object_probe_caps:<v4l2h264enc0:sink> probed caps: video/x-raw, format=(string)NV12, width=(int)[ 64, 1920, 16 ], height=(int)[ 48, 1920, 2 ], framerate=(fraction)[ 1/65535, 65535/1 ], interlace-mode=(string)progressive, colorimetry=(string){ bt709 }
0:00:00.509067877  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1228:gst_v4l2_object_fill_format_list:<v4l2h264enc0:src> got 1 format(s):
0:00:00.509114876  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2h264enc0:src>   H264
0:00:00.509377245  2492 0xaaaadc3bf600 WARN                    v4l2 gstv4l2object.c:4400:gst_v4l2_object_probe_caps:<v4l2h264enc0:src> Failed to probe pixel aspect ratio with VIDIOC_CROPCAP: Invalid argument
0:00:00.509608489  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:4458:gst_v4l2_object_probe_caps:<v4l2h264enc0:src> probed caps: video/x-h264, stream-format=(string)byte-stream, alignment=(string)au, width=(int)[ 64, 1920, 16 ], height=(int)[ 48, 1920, 2 ], colorimetry=(string){ bt709 }, framerate=(fraction)[ 1/65535, 65535/1 ]
(...)
0:00:00.510477970  2492 0xaaaadc3bf600 INFO                    v4l2 v4l2_calls.c:629:gst_v4l2_open:<v4l2jpegdec0:sink> Opened device 'vpu B0' (/dev/video12) successfully
0:00:00.510546718  2492 0xaaaadc3bf600 INFO                    v4l2 v4l2_calls.c:735:gst_v4l2_dup:<v4l2jpegdec0:src> Cloned device 'vpu B0' (/dev/video12) successfully
0:00:00.510673340  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1228:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink> got 15 format(s):
0:00:00.510722464  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   JPEG
0:00:00.510768588  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   M264
0:00:00.510813712  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   LOGO
0:00:00.510858211  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   XVID
0:00:00.510902960  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   HEVC
0:00:00.510947459  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   VP80
0:00:00.510991958  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   H263
0:00:00.511036582  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   SPK0
0:00:00.511081206  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   VP60
0:00:00.511125705  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   MPG4
0:00:00.511171204  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   AVS0
0:00:00.511215578  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   MPG2
0:00:00.511259577  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   VC1L
0:00:00.511304201  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   VC1G
0:00:00.511348325  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:sink>   H264
0:00:00.511400699  2492 0xaaaadc3bf600 WARN                    v4l2 gstv4l2object.c:2031:gst_v4l2_object_get_interlace_mode: Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git

0:00:00.511442573  2492 0xaaaadc3bf600 WARN                    v4l2 gstv4l2object.c:2031:gst_v4l2_object_get_interlace_mode: Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git

0:00:00.511664318  2492 0xaaaadc3bf600 INFO                    v4l2 gstv4l2object.c:4458:gst_v4l2_object_probe_caps:<v4l2jpegdec0:sink> probed caps: image/jpeg, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], colorimetry=(string){ bt709 }, parsed=(boolean)true
(...)
0:00:00.512338052  2492 0xaaaadc3bf600 INFO                    v4l2 v4l2_calls.c:629:gst_v4l2_open:<v4l2src0:src> Opened device 'HD USB Camera: HD USB Camera' (/dev/video2) successfully
0:00:00.512379801  2492 0xaaaadc3bf600 WARN                    v4l2 v4l2_calls.c:547:gst_v4l2_subscribe_event:<v4l2src0> Cannot subscribe V4L2_EVENT_SOURCE_CHANGE or V4L2_EVENT_EOS event for device '/dev/video2'.
(....)
0:00:00.513800894  2492 0xaaaadc3bf600 INFO                 basesrc gstbasesrc.c:1373:gst_base_src_do_seek:<v4l2src0> seeking: time segment start=0:00:00.000000000, offset=0:00:00.000000000, stop=99:99:99.999999999, rate=1.000000, applied_rate=1.000000, flags=0x00, time=0:00:00.000000000, base=0:00:00.000000000, position 0:00:00.000000000, duration 99:99:99.999999999
0:00:00.513879142  2492 0xaaaadc3bf600 INFO                    task gsttask.c:453:gst_task_set_lock: setting stream lock 0xaaaadc618260 on task 0xaaaadc61a4d0
0:00:00.513916641  2492 0xaaaadc3bf600 INFO                GST_PADS gstpad.c:6159:gst_pad_start_task:<v4l2src0:src> created task 0xaaaadc61a4d0
(...)
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
0:00:00.515688101  2492 0xaaaadc3bf600 INFO               GST_EVENT gstevent.c:1449:gst_event_new_latency: creating latency event 0:00:00.000000000
0:00:00.515772099  2492 0xaaaadc3bf600 INFO                     bin gstbin.c:2783:gst_bin_do_latency_func:<pipeline0> configured latency of 0:00:00.000000000
0:00:00.515842472  2492 0xaaaadc3bf600 INFO              GST_STATES gstbin.c:2503:gst_bin_element_set_state:<autovideosink0> current READY pending PAUSED, desired next PLAYING
(...)
New clock: GstSystemClock
0:00:00.517009446  2492 0xaaaadc620a80 INFO        GST_ELEMENT_PADS gstelement.c:912:gst_element_get_static_pad: no such pad 'sink' in element "v4l2src0"
0:00:00.517236565  2492 0xaaaadc620a80 INFO                    v4l2 gstv4l2object.c:1228:gst_v4l2_object_fill_format_list:<v4l2src0:src> got 1 format(s):
0:00:00.517279814  2492 0xaaaadc620a80 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2src0:src>   MJPG
0:00:00.517487060  2492 0xaaaadc620a80 INFO                    v4l2 gstv4l2object.c:4458:gst_v4l2_object_probe_caps:<v4l2src0:src> probed caps: image/jpeg, width=(int)1920, height=(int)1080, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)60/1; image/jpeg, width=(int)1280, height=(int)720, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)120/1; image/jpeg, width=(int)640, height=(int)360, pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)1285718/4945
0:00:00.529659282  2492 0xaaaadc620a80 INFO               GST_EVENT gstevent.c:820:gst_event_new_caps: creating caps event image/jpeg, width=(int)1920, height=(int)1080, framerate=(fraction)60/1, colorimetry=(string)bt709, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = image/jpeg, width=(int)1920, height=(int)1080, framerate=(fraction)60/1, colorimetry=(string)bt709, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive
0:00:00.530005899  2492 0xaaaadc620a80 INFO                    v4l2 gstv4l2object.c:3040:gst_v4l2_object_setup_pool:<v4l2jpegdec0:sink> accessing buffers via mode 2
0:00:00.530382015  2492 0xaaaadc620a80 INFO          v4l2bufferpool gstv4l2bufferpool.c:557:gst_v4l2_buffer_pool_set_config:<v4l2jpegdec0:pool:sink> increasing minimum buffers to 2
0:00:00.530417639  2492 0xaaaadc620a80 INFO          v4l2bufferpool gstv4l2bufferpool.c:570:gst_v4l2_buffer_pool_set_config:<v4l2jpegdec0:pool:sink> reducing maximum buffers to 32
0:00:00.530448139  2492 0xaaaadc620a80 INFO          v4l2bufferpool gstv4l2bufferpool.c:581:gst_v4l2_buffer_pool_set_config:<v4l2jpegdec0:pool:sink> can't allocate, setting maximum to minimum
0:00:00.530514387  2492 0xaaaadc620a80 INFO                    v4l2 gstv4l2object.c:1228:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:src> got 2 format(s):
0:00:00.530558386  2492 0xaaaadc620a80 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:src>   NT12
0:00:00.530594135  2492 0xaaaadc620a80 INFO                    v4l2 gstv4l2object.c:1232:gst_v4l2_object_fill_format_list:<v4l2jpegdec0:src>   NV12
0:00:00.530631384  2492 0xaaaadc620a80 WARN                    v4l2 gstv4l2object.c:4400:gst_v4l2_object_probe_caps:<v4l2jpegdec0:src> Failed to probe pixel aspect ratio with VIDIOC_CROPCAP: Invalid argument
0:00:00.531065125  2492 0xaaaadc620a80 INFO                    v4l2 gstv4l2object.c:4458:gst_v4l2_object_probe_caps:<v4l2jpegdec0:src> probed caps: video/x-raw, format=(string)NV12_10LE, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 2147483647/1 ], interlace-mode=(string){ progressive, interleaved }, colorimetry=(string){ bt709 }; video/x-raw, format=(string)NV12, width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], framerate=(fraction)[ 0/1, 2147483647/1 ], interlace-mode=(string){ progressive, interleaved }, colorimetry=(string){ bt709 }
/GstPipeline:pipeline0/v4l2jpegdec:v4l2jpegdec0.GstPad:sink: caps = image/jpeg, width=(int)1920, height=(int)1080, framerate=(fraction)60/1, colorimetry=(string)bt709, parsed=(boolean)true, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive
0:00:00.554645211  2492 0xaaaadc620a80 INFO                    v4l2 gstv4l2object.c:3773:gst_v4l2_object_set_format_full:<v4l2src0:src> Set capture framerate to 60/1
0:00:00.554695960  2492 0xaaaadc620a80 INFO                    v4l2 gstv4l2object.c:3040:gst_v4l2_object_setup_pool:<v4l2src0:src> accessing buffers via mode 2
0:00:00.554897080  2492 0xaaaadc620a80 INFO          v4l2bufferpool gstv4l2bufferpool.c:557:gst_v4l2_buffer_pool_set_config:<v4l2src0:pool:src> increasing minimum buffers to 2
0:00:00.554933955  2492 0xaaaadc620a80 INFO          v4l2bufferpool gstv4l2bufferpool.c:570:gst_v4l2_buffer_pool_set_config:<v4l2src0:pool:src> reducing maximum buffers to 32
0:00:00.555070326  2492 0xaaaadc620a80 INFO          v4l2bufferpool gstv4l2bufferpool.c:570:gst_v4l2_buffer_pool_set_config:<v4l2src0:pool:src> reducing maximum buffers to 32
0:00:00.562723652  2492 0xaaaadc620a80 WARN          v4l2bufferpool gstv4l2bufferpool.c:813:gst_v4l2_buffer_pool_start:<v4l2src0:pool:src> Uncertain or not enough buffers, enabling copy threshold
0:00:00.893169357  2492 0xaaaadc620a80 INFO                 v4l2src gstv4l2src.c:960:gst_v4l2src_create:<v4l2src0> sync to 0:00:00.016666666 out ts 0:00:00.057224030
0:00:00.893362602  2492 0xaaaadc620a80 INFO               GST_EVENT gstevent.c:900:gst_event_new_segment: creating segment event time segment start=0:00:00.000000000, offset=0:00:00.000000000, stop=99:99:99.999999999, rate=1.000000, applied_rate=1.000000, flags=0x00, time=0:00:00.000000000, base=0:00:00.000000000, position 0:00:00.000000000, duration 99:99:99.999999999
0:00:00.893496849  2492 0xaaaadc620a80 INFO                 basesrc gstbasesrc.c:2962:gst_base_src_loop:<v4l2src0> marking pending DISCONT
0:00:00.940186158  2492 0xaaaadc620a80 INFO                    task gsttask.c:453:gst_task_set_lock: setting stream lock 0xaaaadc618700 on task 0xaaaadc61acb0
0:00:00.940323530  2492 0xaaaadc620a80 INFO                GST_PADS gstpad.c:6159:gst_pad_start_task:<v4l2jpegdec0:src> created task 0xaaaadc61acb0
0:00:00.941916119  2492 0xaaaadc620a80 INFO                 v4l2src gstv4l2src.c:960:gst_v4l2src_create:<v4l2src0> sync to 0:00:00.033333332 out ts 0:00:00.377275280
0:00:00.943203339  2492 0xaaaadc620a80 INFO                 v4l2src gstv4l2src.c:960:gst_v4l2src_create:<v4l2src0> sync to 0:00:00.049999998 out ts 0:00:00.393297280
0:00:00.944289190  2492 0xaaaadc620a80 INFO                 v4l2src gstv4l2src.c:960:gst_v4l2src_create:<v4l2src0> sync to 0:00:00.066666664 out ts 0:00:00.409296405
0:00:00.946186021  2492 0xaaaadc63fe80 INFO                    v4l2 gstv4l2object.c:4458:gst_v4l2_object_probe_caps:<v4l2jpegdec0:src> probed caps: video/x-raw, format=(string)NV12_10LE, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], interlace-mode=(string){ progressive, interleaved }; video/x-raw, format=(string)NV12, framerate=(fraction)[ 0/1, 2147483647/1 ], width=(int)[ 1, 32768 ], height=(int)[ 1, 32768 ], interlace-mode=(string){ progressive, interleaved }
0:00:00.946338893  2492 0xaaaadc63fe80 ERROR           v4l2videodec gstv4l2videodec.c:656:gst_v4l2_video_dec_loop:<v4l2jpegdec0> not negotiated

Answer 1

您需要解析H264是相机正在发送H264输出：

gst-launch-1.0 -vvv v4l2src device=/dev/video2 ! video/x-h264,width=1920,height=1080,framerate=30/1 ! h264parse ! autovideosink

如果MJPEG流：

gst-launch-1.0 -e v4l2src device="/dev/video0" ! "image/jpeg,width=1920,height=1080" ! jpegdec ! videoconvert ! autovideosink