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<v4l2src0:pool:src> Dropping truncated buffer, this is likely a driver bug.

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AniketH

<v4l2src0:pool:src> Dropping truncated buffer, this is likely a driver bug.

Trying to capture I420 FHD at 5fps on RP4.
Pipeline is as follows,

v4l2src device=/dev/video0 io-mode=dmabuf !
video/x-raw,width=1920,height=1080 ! videoconvert ! video/x-raw,format=RGBA
! videorate ! video/x-raw,framerate=5/1 ! queue leaky=downstream !
v4l2h264enc capture-io-mode=dmabuf ! video/x-h264,profile=main ! h264parse
splitmuxsink name=mp4mux max-size-time=60000000000 max-size-bytes=134217728
location=/tmp/vid_ sync=false ! queue ! mp4mux.video

After a certain time, v4l2src starts dropping everything.

0:10:33.385742774 42 0xa3bfb0 INFO v4l2src
gstv4l2src.c:961:gst_v4l2src_create:<v4l2src0> sync to 0:10:30.400000000 out
ts 0:10:30.557956381
0:10:33.585610267 42 0xa3bfb0 DEBUG v4l2src
gstv4l2src.c:925:gst_v4l2src_create:<v4l2src0> ts: 1:05:16.523210000 now
1:05:16.695278946 delay 0:00:00.172068946
0:10:33.585754746 42 0xa3bfb0 INFO v4l2src
gstv4l2src.c:961:gst_v4l2src_create:<v4l2src0> sync to 0:10:30.600000000 out
ts 0:10:30.757941863
0:10:33.689999870 42 0xa3bfb0 WARN v4l2bufferpool
gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
Dropping truncated buffer, this is likely a driver bug.
0:10:33.690498344 42 0xa3bfb0 WARN v4l2bufferpool
gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
Dropping truncated buffer, this is likely a driver bug.
0:10:33.693825940 42 0xa3bfb0 WARN v4l2bufferpool
gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
Dropping truncated buffer, this is likely a driver bug.
0:10:33.694079417 42 0xa3bfb0 WARN v4l2bufferpool
gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
Dropping truncated buffer, this is likely a driver bug.
0:10:33.697968615 42 0xa3bfb0 WARN v4l2bufferpool
gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
Dropping truncated buffer, this is likely a driver bug.
0:10:33.698261555 42 0xa3bfb0 WARN v4l2bufferpool
gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
Dropping truncated buffer, this is likely a driver bug.

Is there any issue in my pipeline or is it a v4l2 driver bug?

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Nicolas Dufresne-5

Re: <v4l2src0:pool:src> Dropping truncated buffer, this is likely a driver bug.

Le mercredi 24 juin 2020 à 22:47 -0500, Aniket0987 a écrit :

> Trying to capture I420 FHD at 5fps on RP4.
> Pipeline is as follows,
>
> v4l2src device=/dev/video0 io-mode=dmabuf !
> video/x-raw,width=1920,height=1080 ! videoconvert ! video/x-raw,format=RGBA
> ! videorate ! video/x-raw,framerate=5/1 ! queue leaky=downstream !
> v4l2h264enc capture-io-mode=dmabuf ! video/x-h264,profile=main ! h264parse
> splitmuxsink name=mp4mux max-size-time=60000000000 max-size-bytes=134217728
> location=/tmp/vid_ sync=false ! queue ! mp4mux.video
>
> After a certain time, v4l2src starts dropping everything.
>
> 0:10:33.385742774 42 0xa3bfb0 INFO v4l2src
> gstv4l2src.c:961:gst_v4l2src_create:<v4l2src0> sync to 0:10:30.400000000 out
> ts 0:10:30.557956381
> 0:10:33.585610267 42 0xa3bfb0 DEBUG v4l2src
> gstv4l2src.c:925:gst_v4l2src_create:<v4l2src0> ts: 1:05:16.523210000 now
> 1:05:16.695278946 delay 0:00:00.172068946
> 0:10:33.585754746 42 0xa3bfb0 INFO v4l2src
> gstv4l2src.c:961:gst_v4l2src_create:<v4l2src0> sync to 0:10:30.600000000 out
> ts 0:10:30.757941863
> 0:10:33.689999870 42 0xa3bfb0 WARN v4l2bufferpool
> gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
> Dropping truncated buffer, this is likely a driver bug.
> 0:10:33.690498344 42 0xa3bfb0 WARN v4l2bufferpool
> gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
> Dropping truncated buffer, this is likely a driver bug.
> 0:10:33.693825940 42 0xa3bfb0 WARN v4l2bufferpool
> gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
> Dropping truncated buffer, this is likely a driver bug.
> 0:10:33.694079417 42 0xa3bfb0 WARN v4l2bufferpool
> gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
> Dropping truncated buffer, this is likely a driver bug.
> 0:10:33.697968615 42 0xa3bfb0 WARN v4l2bufferpool
> gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
> Dropping truncated buffer, this is likely a driver bug.
> 0:10:33.698261555 42 0xa3bfb0 WARN v4l2bufferpool
> gstv4l2bufferpool.c:2066:gst_v4l2_buffer_pool_process:<v4l2src0:pool:src>
> Dropping truncated buffer, this is likely a driver bug.
>
> Is there any issue in my pipeline or is it a v4l2 driver bug?

The warning from gst is correct, it's a driver bug. But as you can see,
it has a workaround. The driver I made this workaround for is now fixed
in mainline kernel.

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AniketH

Re: <v4l2src0:pool:src> Dropping truncated buffer, this is likely a driver bug.

Okay. So this has been fixed in v4l2-core? or are we talking about gstreamer
1.17.1.

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Nicolas Dufresne-5

Re: <v4l2src0:pool:src> Dropping truncated buffer, this is likely a driver bug.

Le lundi 29 juin 2020 à 01:57 -0500, Aniket0987 a écrit :
> Okay. So this has been fixed in v4l2-core? or are we talking about gstreamer
> 1.17.1.

v4l2-core, but I tried to add a workaround in gstreamer master, but
there is a limit of what we can do about it in userland.

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AniketH

Re: <v4l2src0:pool:src> Dropping truncated buffer, this is likely a driver bug.

If this is fixed in v4l2-core I believe it will come out with the next linux
kernel release, correct me if otherwise. Is there any other way to upgrade
v4l2?

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Nicolas Dufresne-5

Re: <v4l2src0:pool:src> Dropping truncated buffer, this is likely a driver bug.

Le sam. 4 juill. 2020 07 h 45, Aniket0987 <[hidden email]> a écrit :

If this is fixed in v4l2-core I believe it will come out with the next linux
kernel release, correct me if otherwise. Is there any other way to upgrade
v4l2?

The next kernel release is very ambiguous, since there is often a certain lag between the official release and distro / embedded board being updated. Also, bug fixes can be backported.

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