What is the minimal supported iOS version ?

[manuroe]

The openwebrtc-ios-sdk claims iOS7 but the iOS OWR demo apps start from iOS8.
Matrix Console starts from iOS7. Calls works fine between iOS7 OWR and FF/Chrome or other iOS7 OWR client.
But there is an interoperability issue when making calls between iOS7 vs iOS8: there is no video both side.

Only the iOS7 logs show errors:

Assert - (kernResult == kIOReturnSuccess) - f: /SourceCache/AppleVXE380/AppleVXE380-403/Library/AppleVXE380UserLandLibrary.cpp l: 494
AppleVXE380VA ERROR: IOServiceOpen failed
Assert - (false) - f: /SourceCache/AppleVXE380/AppleVXE380-403/Library/AppleVXE380FIGwrapper.cpp l: 3106
VXE FIG: H264VideoEncoderVA_DriverCreate failed.
Assert - (pDriverInstance) - f: /SourceCache/AppleVXE380/AppleVXE380-403/Library/AppleVXE380UserLandLibrary.cpp l: 579
AppleVXE380VA ERROR: AppleVXE380VA_DriverDelete, pDriverInstance NULL.

Assert - (err == noErr) - f: /SourceCache/AppleVXE380/AppleVXE380-403/Library/AppleVXE380FIGwrapper.cpp l: 3227
VXE FIG ERROR: AppleVXE380VA_DriverDelete failed.
0:04:43.601722000 �[332m 787�[00m 0x163321b8 �[31;01mERROR �[00m �[00m vtenc vtenc.c:792:gst_vtenc_create_session:<encoder_vtenc_h264_0>�[00m VTCompressionSessionCreate() returned: -12907

[stefanalund]

@alessandrod do you think this is related to the GStreamer elements for HW coding?

[superdump]

Wasn't VideoToolbox only published as a framework for iOS 8?

In which case, yes. iOS 7 cannot and should not use vt* elements. Maybe we can code around that.

[stefanalund]

To answer your question stated in the title of the issue, OWR supports at least iOS 7. As @superdump says iOS 8 introduced the possibility to do HW accelerated H.264 video. If OWR is running on iOS 8 and a supported device, HW will be used, otherwise we fall back to SW coding via OpenH264.