16:39 <formruga> Hi. Do someone know if is possible to decode h264 movie with v4l2h264dec (GStreamer 1.16.2) on Odroid N2 (Linux 5.5-rc6, firmware g12a_h264.bin from linux-firmware 20200120)?

16:39 <formruga> I asked, because for "gst-launch-1.0 filesrc location=sintel_trailer-720p.mp4 ! parsebin ! v4l2h264dec ! fakesink dump=yes", I don't get any decoded frame (pipeline goes to playing). I got warning: "WARN v4l2allocator gstv4l2allocator.c:1369:gst_v4l2_allocator_dqbuf:<v4l2h264dec0:pool:src:allocator> V4L2 provided buffer has bytesused 0

16:39 <formruga> which is too small to include data_offset 0"

16:53 <chewitt> ndufresne ^ were you responsible for GStreamer support? .. I forget anything that's not ffmpeg :)

16:53 <ndufresne> it's just hobby on this platform for me, but I'm please to help

16:54 <ndufresne> formruga: this is kernel badly behaving, ffmpeg code does not do bound checks, that's why chewitt didn't notice ;-D

16:56 <ndufresne> formruga: I'm super late on testing, but narmstrong send v4 of "media: meson: vdec: Add compliant H264 support", which I have doubt made it for 5.5, but is likely to fix these type of errors

16:57 <chewitt> formruga: does the kernel source you're using have the H264 vdec code merged?

16:57 <chewitt> it's not upstream yet, only MPEG2

16:57 <chewitt> patches are available tho, so easy to patch in

16:58 <ndufresne> I'd give v4 a try really, first one passing the latest v4l2-compliance

16:59 <formruga> chewitt: I see. When I saw in dmesg that kernel driver search for g12a_h264.bin, I assume that the driver support h.264. My fault.

17:00 <formruga> Thanks for explanations. I will check v4.

17:00 <chewitt> it depends on who's sources you're using

17:00 <formruga> I took nightly version of Armbian, which is pointed on linux-meson.com.

17:02 <chewitt> that's probably using a derivative of my sources so H264 should be patched in; maybe v3 not v4

17:02 <chewitt> firmware should be included too .. if not it's here: https://github.com/LibreELEC/meson-firmware/tree/master/meson/vdec

17:04 <ndufresne> v3 didn't work on GStreamer, that one I tested