Gstreamer IOS教程中缺少符号

Question

I have just downloaded the gstreamer ios binaries from https://gstreamer.freedesktop.org/data/pkg/ios/1.8.1/ . and the gstreamer sdk from https://cgit.freedesktop.org/~slomo/gst-sdk-tutorials/ (which has not been updated for 7 months? -- is there a newer version)?

When I enable the following features in gst_ios_init.h, i am unable to resolve the symbols as follows. Is there a newer SDK? I don't need liveadder or fragmented or editing tools, but the ios compression support seems like it would be useful.

When I enable:

#define GST_IOS_PLUGINS_EFFECTS

I get:

Undefined symbols for architecture x86_64:
  "_gst_plugin_liveadder_register", referenced from:
      _gst_ios_init in gst_ios_init.o

When I enable:

#define GST_IOS_PLUGINS_CODECS

I get:

Undefined symbols for architecture x86_64:
  "_gst_plugin_fragmented_register", referenced from:
      _gst_ios_init in gst_ios_init.o

When I enable:

#define GST_IOS_PLUGINS_EDITING

I get:

Undefined symbols for architecture x86_64:
  "_gst_plugin_gnonlin_register", referenced from:
      _gst_ios_init in gst_ios_init.o

When I enable:

#define GST_IOS_PLUGINS_SYS

I get:

Undefined symbols for architecture x86_64:
  "_VTCompressionSessionCompleteFrames", referenced from:
      _gst_vtenc_finish in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_VTCompressionSessionCreate", referenced from:
      _plugin_init in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-plugin.o)
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_VTCompressionSessionEncodeFrame", referenced from:
      _gst_vtenc_handle_frame in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_VTCompressionSessionInvalidate", referenced from:
      _gst_vtenc_destroy_session in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_VTCompressionSessionPrepareToEncodeFrames", referenced from:
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_VTDecompressionSessionCreate", referenced from:
      _gst_vtdec_negotiate in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtdec.o)
  "_VTDecompressionSessionDecodeFrame", referenced from:
      _gst_vtdec_handle_frame in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtdec.o)
  "_VTDecompressionSessionInvalidate", referenced from:
      _gst_vtdec_invalidate_session in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtdec.o)
  "_VTDecompressionSessionWaitForAsynchronousFrames", referenced from:
      _gst_vtdec_push_frames_if_needed in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtdec.o)
  "_VTSessionCopyProperty", referenced from:
      _gst_vtenc_handle_frame in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
      _gst_vtenc_session_dump_property in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_VTSessionCopySupportedPropertyDictionary", referenced from:
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_VTSessionSetProperty", referenced from:
      _gst_vtenc_set_property in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
      _gst_vtenc_session_configure_property_double in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
      _gst_vtenc_session_configure_property_int in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTCompressionPropertyKey_AllowFrameReordering", referenced from:
      _gst_vtenc_set_property in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTCompressionPropertyKey_AllowTemporalCompression", referenced from:
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTCompressionPropertyKey_AverageBitRate", referenced from:
      _gst_vtenc_set_property in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTCompressionPropertyKey_ExpectedFrameRate", referenced from:
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTCompressionPropertyKey_MaxKeyFrameInterval", referenced from:
      _gst_vtenc_set_property in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration", referenced from:
      _gst_vtenc_set_property in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTCompressionPropertyKey_NumberOfPendingFrames", referenced from:
      _gst_vtenc_handle_frame in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTCompressionPropertyKey_ProfileLevel", referenced from:
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTCompressionPropertyKey_Quality", referenced from:
      _gst_vtenc_set_quality in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTCompressionPropertyKey_RealTime", referenced from:
      _gst_vtenc_set_property in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
      _gst_vtenc_set_format in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)
  "_kVTEncodeFrameOptionKey_ForceKeyFrame", referenced from:
      _gst_vtenc_init in GStreamer(libgstapplemedia_a_x86_64_-libgstapplemedia_la-vtenc.o)

Answer 1

This is because your gstreamer framework installed is not the same as the tutorial. Copy according gst_ios_init.h and gst_ios_init.m to tutorial project will fix the issue

Answer 2

只需将VideoToolBox框架添加到您的项目中即可。