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gstjpegdec sets 1:4:0:0 colorimetry (full range BT.601 YCbCr encoding with unknown primaries and unknown transfer function). This currently gets translated to bt601 or bt709 depending on resolution. Both cases result in a negotiation failure: ERROR: from element /GstPipeline:pipeline0/v4l2video0convert:v4l2video0convert0: Device '/dev/video0' does not support 1:4:0:0 colorimetry Improve the guessing game by selecting JPEG colorimetry (JPEG colorspace with sRGB transfer function) under these specific conditions, and loosen the matching so that 1:4:0:0 input gets accepted if the device is actually configured to 1:4:7:1 (V4L2_PIX_FMT_JPEG default). https://bugzilla.gnome.org/show_bug.cgi?id=796940
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