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That's a bug in the driver. >> >>> It seems to be happen in: >>> sd = media_entity_to_v4l2_subdev(pad->entity); >>> >>> in mxc_isi_crossbar_xlate_streams() >>> >>> Checking now if the pad variable is the issue >>> >>> it seems media_pad_remote_pad_first() can return NULL which would cause >>> the issue there I think. > > Can you share the media graph as output by `media-ctl -p -d /dev/media0` > just before running ffmpeg ? You may need to replace media0 with the > device corresponding to the ISI if you have multiple media devices in > the system. media-ctl -p -d 1 Media controller API version 6.12.41 Media device information ------------------------ driver mxc-isi model FSL Capture Media Device serial bus info platform:32e00000.isi hw revision 0x0 driver version 6.12.41 Device topology - entity 1: crossbar (5 pads, 4 links, 0 routes) type V4L2 subdev subtype Unknown flags 0 device node name /dev/v4l-subdev0 pad0: SINK,MUST_CONNECT [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range] <- "csis-32e40000.csi":1 [ENABLED,IMMUTABLE] pad1: SINK,MUST_CONNECT [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range] pad2: SINK,MUST_CONNECT <- "mxc_isi.output":0 [ENABLED,IMMUTABLE] pad3: SOURCE [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range] -> "mxc_isi.0":0 [ENABLED,IMMUTABLE] pad4: SOURCE [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:lim-range] -> "mxc_isi.1":0 [ENABLED,IMMUTABLE] - entity 7: mxc_isi.0 (2 pads, 2 links, 0 routes) type V4L2 subdev subtype Unknown flags 0 device node name /dev/v4l-subdev1 pad0: SINK [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:jpeg xfer:srgb ycbcr:601 quantization:full-range compose.bounds:(0,0)/1920x1080 compose:(0,0)/1920x1080] <- "crossbar":3 [ENABLED,IMMUTABLE] pad1: SOURCE [stream:0 fmt:YUV8_1X24/1920x1080 field:none colorspace:jpeg xfer:srgb ycbcr:601 quantization:full-range crop.bounds:(0,0)/1920x1080 crop:(0,0)/1920x1080] -> "mxc_isi.0.capture":0 [ENABLED,IMMUTABLE] - entity 10: mxc_isi.0.capture (1 pad, 1 link) type Node subtype V4L flags 0 device node name /dev/video1 pad0: SINK <- "mxc_isi.0":1 [ENABLED,IMMUTABLE] - entity 18: mxc_isi.1 (2 pads, 2 links, 0 routes) type V4L2 subdev subtype Unknown flags 0 device node name /dev/v4l-subdev2 pad0: SINK [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:jpeg xfer:srgb ycbcr:601 quantization:full-range compose.bounds:(0,0)/1920x1080 compose:(0,0)/1920x1080] <- "crossbar":4 [ENABLED,IMMUTABLE] pad1: SOURCE [stream:0 fmt:YUV8_1X24/1920x1080 field:none colorspace:jpeg xfer:srgb ycbcr:601 quantization:full-range crop.bounds:(0,0)/1920x1080 crop:(0,0)/1920x1080] -> "mxc_isi.1.capture":0 [ENABLED,IMMUTABLE] - entity 21: mxc_isi.1.capture (1 pad, 1 link) type Node subtype V4L flags 0 device node name /dev/video2 pad0: SINK <- "mxc_isi.1":1 [ENABLED,IMMUTABLE] - entity 29: mxc_isi.output (1 pad, 1 link) type Node subtype V4L flags 0 pad0: SOURCE -> "crossbar":2 [ENABLED,IMMUTABLE] - entity 36: csis-32e40000.csi (2 pads, 2 links, 0 routes) type V4L2 subdev subtype Unknown flags 0 device node name /dev/v4l-subdev3 pad0: SINK,MUST_CONNECT [stream:0 fmt:UYVY8_1X16/640x480 field:none colorspace:smpte170m xfer:709 ycbcr:601 quantization:lim-range] <- "imx219 5-0010":0 [] pad1: SOURCE,MUST_CONNECT [stream:0 fmt:UYVY8_1X16/640x480 field:none colorspace:smpte170m xfer:709 ycbcr:601 quantization:lim-range] -> "crossbar":0 [ENABLED,IMMUTABLE] - entity 41: imx219 5-0010 (1 pad, 1 link, 0 routes) type V4L2 subdev subtype Sensor flags 0 device node name /dev/v4l-subdev4 pad0: SOURCE [stream:0 fmt:SRGGB10_1X10/3280x2464 field:none colorspace:raw xfer:none ycbcr:601 quantization:full-range crop.bounds:(8,8)/3280x2464 crop:(8,8)/3280x2464] -> "csis-32e40000.csi":0 [] media0 seems to be dw100, 2 and 3 are hantro-vpu