gstreamer 1.20: v4l2bufferpool spams "newly allocated buffer is not free"

[Nicolas Dufresne]

Hi,

Le ven. 24 juin 2022, 11 h 00, Michiel Konstapel via gstreamer-devel <
gstreamer-devel at lists.freedesktop.org> a écrit :

> After updating from gstreamer 1.18 to 1.20.3, v4l2src keeps spamming
> warnings:
>
> GST_DEBUG=3 gst-launch-1.0 v4l2src device=/dev/video2 ! image/jpeg !
> jpegdec ! videoconvert ! autovideosink
>
> v4l2bufferpool
> gstv4l2bufferpool.c:478:gst_v4l2_buffer_pool_alloc_buffer:<v4l2src0:pool0:src>
>
> newly allocated buffer 0 is not free
> v4l2bufferpool
> gstv4l2bufferpool.c:478:gst_v4l2_buffer_pool_alloc_buffer:<v4l2src0:pool0:src>
>
> newly allocated buffer 1 is not free
> v4l2bufferpool
> gstv4l2bufferpool.c:478:gst_v4l2_buffer_pool_alloc_buffer:<v4l2src0:pool0:src>
>
> newly allocated buffer 2 is not free
> v4l2bufferpool
> gstv4l2bufferpool.c:478:gst_v4l2_buffer_pool_alloc_buffer:<v4l2src0:pool0:src>
>
> newly allocated buffer 3 is not free
> v4l2bufferpool
> gstv4l2bufferpool.c:478:gst_v4l2_buffer_pool_alloc_buffer:<v4l2src0:pool0:src>
>
> newly allocated buffer 0 is not free
> v4l2bufferpool
> gstv4l2bufferpool.c:478:gst_v4l2_buffer_pool_alloc_buffer:<v4l2src0:pool0:src>
>
> newly allocated buffer 1 is not free
> v4l2bufferpool
> gstv4l2bufferpool.c:478:gst_v4l2_buffer_pool_alloc_buffer:<v4l2src0:pool0:src>
>
> newly allocated buffer 2 is not free
> v4l2bufferpool
> gstv4l2bufferpool.c:478:gst_v4l2_buffer_pool_alloc_buffer:<v4l2src0:pool0:src>
>
> newly allocated buffer 3 is not free


> If I increase the output to v4l2*:5 I see the following:
>
> v4l2bufferpool
> gstv4l2bufferpool.c:778:gst_v4l2_buffer_pool_start:<v4l2src0:pool0:src>
> activating pool
> v4l2bufferpool
> gstv4l2bufferpool.c:825:gst_v4l2_buffer_pool_start:<v4l2src0:pool0:src>
> requesting 4 MMAP buffers
> v4l2allocator
> gstv4l2allocator.c:707:gst_v4l2_allocator_start:<v4l2src0:pool0:src:allocator>
>
> allocated 4 mmap buffers out of 4 requested
> v4l2bufferpool
> gstv4l2bufferpool.c:843:gst_v4l2_buffer_pool_start:<v4l2src0:pool0:src>
> Uncertain or not enough buffers, enabling copy threshold
> v4l2bufferpool
> gstv4l2bufferpool.c:1587:gst_v4l2_buffer_pool_complete_release_buffer:<v4l2src0:pool0:src>
>
> complete release buffer 0x55aafd63c5a0 (queued = no)
> v4l2bufferpool
> gstv4l2bufferpool.c:1587:gst_v4l2_buffer_pool_complete_release_buffer:<v4l2src0:pool0:src>
>
> complete release buffer 0x55aafd63c6c0 (queued = no)
> v4l2bufferpool
> gstv4l2bufferpool.c:1587:gst_v4l2_buffer_pool_complete_release_buffer:<v4l2src0:pool0:src>
>
> complete release buffer 0x55aafd63c7e0 (queued = no)
> v4l2bufferpool
> gstv4l2bufferpool.c:1587:gst_v4l2_buffer_pool_complete_release_buffer:<v4l2src0:pool0:src>
>
> complete release buffer 0x55aafd63c900 (queued = no)
> v4l2bufferpool
> gstv4l2bufferpool.c:696:gst_v4l2_buffer_pool_streamon:<v4l2src0:pool0:src>
> Started streaming
> v4l2bufferpool
> gstv4l2bufferpool.c:1079:gst_v4l2_buffer_pool_flush_stop:<v4l2src0:pool0:src>
>
> stop flushing
> v4l2bufferpool
> gstv4l2bufferpool.c:1489:gst_v4l2_buffer_pool_acquire_buffer:<v4l2src0:pool0:src>
>
> acquire
> v4l2bufferpool
> gstv4l2bufferpool.c:1949:gst_v4l2_buffer_pool_process:<v4l2src0:pool0:src>
> process buffer 0x7f6f31680d08
>      v4l2src gstv4l2src.c:1051:gst_v4l2src_create:<v4l2src0> ts:
> 4:27:07.368257000 now 4:27:07.392314094 delay 0:00:00.024057094
> v4l2bufferpool
> gstv4l2bufferpool.c:643:gst_v4l2_buffer_pool_resurrect_buffer:<v4l2src0:pool0:src>
>
> A buffer was lost, reallocating it
> v4l2bufferpool
> gstv4l2bufferpool.c:1489:gst_v4l2_buffer_pool_acquire_buffer:<v4l2src0:pool0:src>
>
> acquire
> v4l2bufferpool
> gstv4l2bufferpool.c:478:gst_v4l2_buffer_pool_alloc_buffer:<v4l2src0:pool0:src>
>
> newly allocated buffer 1 is not free
>
> Despite the warnings, the pipeline appears to work, but I would prefer
> it to not spam warnings continuously :) Any ideas? This is on Ubuntu
> 20.04, on different PCs and with different cameras.
>

Do you have any information about the driver?



> Cheers,
> Michiel
>
>
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