2395518_en-US

[#1]

i.MX8MP Hardware H.264 Encoder (VC8000E/Hantro) Not Working – V4L2 Encoder Poll Error "Operation not

We are trying to enable hardware H.264 encoding on the i.MX8M Plus platform using the Hantro VC8000E encoder.

Kernel Configuration Enabled

CONFIG_VIDEO_IMX8M_VDOA=y

CONFIG_MXC_HANTRO=y

CONFIG_MXC_HANTRO_V4L2=y

CONFIG_MXC_HANTRO_VC8000E=y

CONFIG_V4L_MEM2MEM_DRIVERS=y

CONFIG_VIDEO_V4L2=y

CONFIG_MEDIA_SUPPORT=y

Device Tree

VPU/VC8000E nodes have been enabled in DTS.

&vpu_g1 {

status = "okay";

};

&vpu_g2 {

status = "okay";

};

&vpu_vc8000e {

status = "okay";

};

&vpu_v4l2 {

status = "okay";

};

Test Pipeline used:-

GST_DEBUG=3 gst-launch-1.0 \

videotestsrc ! videoconvert ! v4l2h264enc ! fakesink

GST_DEBUG=3 gst-launch-1.0 videotestsrc ! videoconvert ! v4l2h264enc ! fakesink
Fontconfig error: No writable cache directories
Fontconfig error: No writable cache directories
0:00:01.324000750 50377 0xaaaaf19f5a40 WARN default gstsfelement.c:97:gst_sf_create_audio_template_caps: format 0x120000: 'AVR (Audio Visual Research)' is not mapped
0:00:01.324100250 50377 0xaaaaf19f5a40 WARN default gstsfelement.c:97:gst_sf_create_audio_template_caps: format 0x180000: 'CAF (Apple Core Audio File)' is not mapped
0:00:01.324135000 50377 0xaaaaf19f5a40 WARN default gstsfelement.c:97:gst_sf_create_audio_template_caps: format 0x100000: 'HTK (HMM Tool Kit)' is not mapped
0:00:01.324179500 50377 0xaaaaf19f5a40 WARN default gstsfelement.c:97:gst_sf_create_audio_template_caps: format 0xc0000: 'MAT4 (GNU Octave 2.0 / Matlab 4.2)' is not md
0:00:01.324212875 50377 0xaaaaf19f5a40 WARN default gstsfelement.c:97:gst_sf_create_audio_template_caps: format 0xd0000: 'MAT5 (GNU Octave 2.1 / Matlab 5.0)' is not md
0:00:01.324245125 50377 0xaaaaf19f5a40 WARN default gstsfelement.c:97:gst_sf_create_audio_template_caps: format 0x210000: 'MPC (Akai MPC 2k)' is not mapped
0:00:01.324283000 50377 0xaaaaf19f5a40 WARN default gstsfelement.c:97:gst_sf_create_audio_template_caps: format 0xe0000: 'PVF (Portable Voice Format)' is not mapped
0:00:01.324318750 50377 0xaaaaf19f5a40 WARN default gstsfelement.c:97:gst_sf_create_audio_template_caps: format 0x160000: 'SD2 (Sound Designer II)' is not mapped
0:00:01.324363125 50377 0xaaaaf19f5a40 WARN default gstsfelement.c:97:gst_sf_create_audio_template_caps: format 0x190000: 'WVE (Psion Series 3)' is not mapped
Fontconfig error: No writable cache directories
Fontconfig error: No writable cache directories
0:00:06.638305750 50254 0xaaaafd743f80 WARN GST_REGISTRY gstregistry.c:2003:gst_update_registry: registry update failed: Error writing registry cache to /home/devuser/.cacy
Setting pipeline to PAUSED ...

====== V4L2ENC: 1.24.0 build on Jul 24 2024 02:25:45. ======
0:00:06.800120125 50254 0xaaaafd743f80 WARN v4l2 gstv4l2object.c:5230:gst_v4l2_object_probe_caps: Failed to probe pixel aspect ratio with VIDIOC_t
Pipeline is PREROLLING ...
0:00:06.802941500 50254 0xffffb4000b70 FIXME default gstutils.c:4088:gst_element_decorate_stream_id_internal: Creating random stream-id, consider implemd
Redistribute latency...
0:00:06.847293500 50254 0xffffb4000b70 WARN v4l2bufferpool gstv4l2bufferpool.c:875:gst_v4l2_buffer_pool_start: Uncertain or not enough buffers, enabld
0:00:06.889086250 50254 0xffffb4000b70 WARN v4l2 gstv4l2object.c:6189:gst_v4l2_object_poll: error: poll error 1: Operation not permitted (1)
ERROR: from element /GstPipeline:pipeline0/v4l2h264enc:v4l2h264enc0: Could not read from resource.
Additional debug info:
/usr/src/debug/gstreamer1.0-plugins-good/1.24.0.imx/sys/v4l2/gstv4l2object.c(6189): gst_v4l2_object_poll (): /GstPipeline:pipeline0/v4l2h264enc:v4l2h264enc0:
poll error 1: Operation not permitted (1)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
0:00:06.892575000 50254 0xffffb4000b70 WARN v4l2videoenc gstv4l2videoenc.c:941:gst_v4l2_video_enc_handle_frame: error: Failed to process frame.
0:00:06.892941125 50254 0xffffb4000b70 WARN v4l2videoenc gstv4l2videoenc.c:941:gst_v4l2_video_enc_handle_frame: error: Maybe be due to not enough memory or fr
ERROR: from element /GstPipeline:pipeline0/v4l2h264enc:v4l2h264enc0: Failed to process frame.
Additional debug info:
/usr/src/debug/gstreamer1.0-plugins-good/1.24.0.imx/sys/v4l2/gstv4l2videoenc.c(941): gst_v4l2_video_enc_handle_frame (): /GstPipeline:pipeline0/v4l2h264enc:v4l2h264enc0:
Maybe be due to not enough memory or failing driver
ERROR: pipeline doesn't want to preroll.
0:00:06.898059500 50254 0xffffb4000b70 WARN basesrc gstbasesrc.c:3175:gst_base_src_loop: error: Internal data stream error.
0:00:06.898398750 50254 0xffffb4000b70 WARN basesrc gstbasesrc.c:3175:gst_base_src_loop: error: streaming stopped, reason error (-5)
ERROR: from element /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data stream error.
Additional debug info:
/usr/src/debug/gstreamer1.0/1.24.0.imx/libs/gst/base/gstbasesrc.c(3175): gst_base_src_loop (): /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
streaming stopped, reason error (-5)
ERROR: pipeline doesn't want to preroll.
0:00:06.927425375 50254 0xaaaafd743f80 WARN bufferpool gstbufferpool.c:1429:gst_buffer_pool_set_flushing: can't change flushing state of inactivl
0:00:06.928232250 50254 0xaaaafd743f80 WARN bufferpool gstbufferpool.c:1429:gst_buffer_pool_set_flushing: can't change flushing state of inactivl
Freeing pipeline ...

Request

Please provide:

1. Complete list of required kernel configurations for i.MX8MP hardware encoding.
2. Required DTS entries for VC8000E/Hantro encoder.
3. Required firmware files and their expected locations.
4. Required GStreamer plugins/packages.
5. Required multimedia libraries (imx-gst plugins, vpu wrappers, etc.).
6. Any CMA/memory requirements.
7. Validation procedure to verify encoder driver initialization.
8. Recommended test pipelines for H.264 hardware encoding.

i.MX 8M | i.MX 8M Mini | i.MX 8M NanoRe: i.MX8MP Hardware H.264 Encoder (VC8000E/Hantro) Not Working – V4L2 Encoder Poll Error "Oper

Hi @ajayvk1,
Thank you for contacting NXP Support!

1) imx_v8_defconfig

2) imx8mp-evk.dts 

3) The multimedia or full image is needed for this feature

4) The multimedia or full image is needed for this feature

5) RM00294.pdf 

Best Regards,
Chavira