Trying to pipe video feed from v4l2src to v4l2covert and then v4l2h264enc. Source is an analog camera producing 50fps UYVY video. Need to convert color space to RGBA to get a fork of it using tee and feed it into qmlglsink somewhere else. Using the following pipeline, I'm getting encoded video with swapped colors (R in inplace of B and vice-versa): gst-launch-1.0 v4l2src norm=PAL do-timestamp=true ! \ video/x-raw,format=UYVY,width=720,height=576 ! \ videocrop left=8 right=8 ! v4l2convert ! video/x-raw,format=RGBA ! \ v4l2h264enc ! video/x-h264,level="(string)3.1" ! filesink location="output.mp4" So then I tried to manipulate color format info using capssetter and change RGBA to BGRA as encoder supports both formats and probably this would fix it. But after inserting the capssetter into the pipeline, it won't start and it'll return errors. The pipeline: gst-launch-1.0 v4l2src norm=PAL ! \ video/x-raw,format=UYVY,width=720,height=576 ! \ videocrop left=8 right=8 ! v4l2convert ! \ video/x-raw,format=RGBA,width=704,height=576,framerate=25/1, \ interlace-mode=progressive ! \ capssetter join=true replace=false \ caps="video/x-raw,format=BGRA,framerate=50/1" ! \ v4l2h264enc ! video/x-h264,level="(string)3.1" ! filesink location="output.mp4" errors in gst-launch output: GST_CAPS gstpad.c:3240:gst_pad_query_accept_caps_default:<v4l2h264enc0:sink> caps: video/x-raw, framerate=(fraction)50/1, interlace-mode=(string)progressive, format=(string)BGRA, width=(int)704, height=(int)576 were not compatible with: EMPTY basetransform gstbasetransform.c:1371:gst_base_transform_setcaps:<capssetter0> transform could not transform video/x-raw, framerate=(fraction)25/1, interlace-mode=(string)progressive, format=(string)RGBA, width=(int)704, height=(int)576 in anything we support Machine is a raspberrypi 4 device. Asking the same question in their forum, they said they "did check the byte ordering for RGBA and confirmed that it was correct, which means it is GStreamer that has the mismatch. You can use capssetter to correct the mismatch.", but I did not get answers about the output error after inserting capssetter into the pipeline.
