Segmentation Fault in samples/00_video_decode

[yzhk1015]

Hi,
When I tried the sample 00_video_decode (of multimedia API R32.2.0) in my module (Jetpack 4.6 [L4T 32.6.1] ), it crashed with a segmentfault.

cidi@cidi:/media/cidi/data/tegra_multimedia_api/samples/00_video_decode$ ./video_decode H264 --disable-rendering --dbg-level 3 -o 1111_ench264_dec.yuv …/1111_enc.h264
Set governor to performance before enabling profiler
Creating decoder in blocking mode
Opening in BLOCKING MODE
[DEBUG] (NvV4l2Element.cpp:70) :Opened, fd = 14
[DEBUG] (NvV4l2Element.cpp:228) :Successfully subscribed to event 5
NvMMLiteOpen : Block : BlockType = 261
NVMEDIA: Reading vendor.tegra.display-size : status: 6
NvMMLiteBlockCreate : Block : BlockType = 261
[DEBUG] (NvV4l2ElementPlane.cpp:376) :Output Plane:VIDIOC_S_FMT at capture plane successful
Setting frame input mode to 1
[DEBUG] (NvV4l2Element.cpp:190) :Set controls
[DEBUG] (NvVideoDecoder.cpp:207) :Setting decoder frame input mode to 1: success
[DEBUG] (NvV4l2ElementPlane.cpp:522) :Output Plane:Reqbuf returned 2 buffers
[DEBUG] (NvV4l2ElementPlane.cpp:627) :Output Plane:QueryBuf for 0th buffer successful
[DEBUG] (NvV4l2ElementPlane.cpp:665) :Output Plane:ExportBuf successful for Buffer 0, Plane 0, fd = 1047
[DEBUG] (NvBuffer.cpp:175) Mapped buffer 0, plane 0 to
[DEBUG] (NvV4l2ElementPlane.cpp:627) :Output Plane:QueryBuf for 1th buffer successful
[DEBUG] (NvV4l2ElementPlane.cpp:665) :Output Plane:ExportBuf successful for Buffer 1, Plane 0, fd = 1048
[DEBUG] (NvBuffer.cpp:175) Mapped buffer 1, plane 0 to
[DEBUG] (NvV4l2ElementPlane.cpp:556) :Output Plane:STREAMON successful
Starting decoder capture loop thread
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Output Plane:Qed buffer 0
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Output Plane:Qed buffer 1
Input file read complete
[DEBUG] (NvV4l2Element.cpp:110) :DQed event 5
[DEBUG] (NvV4l2ElementPlane.cpp:358) :Capture Plane:Getting format: success
[DEBUG] (NvV4l2ElementPlane.cpp:394) :Capture Plane:Getting crop params: success
Video Resolution: 720x1280
[DEBUG] (NvV4l2ElementPlane.cpp:535) :Capture Plane:Already in STREAMOFF
[DEBUG] (NvV4l2ElementPlane.cpp:916) :Capture Plane:Stopped DQ Thread
[DEBUG] (NvV4l2ElementPlane.cpp:522) :Capture Plane:Reqbuf returned 0 buffers
[DEBUG] (NvV4l2ElementPlane.cpp:458) :Capture Plane:deinit successful
[DEBUG] (NvV4l2ElementPlane.cpp:376) :Capture Plane:VIDIOC_S_FMT at capture plane successful
[DEBUG] (NvV4l2Element.cpp:171) :Got value 21 for control 9963815
[DEBUG] (NvVideoDecoder.cpp:215) :Getting decoder minimum capture plane buffers (21): success
Decoder colorspace ITU-R BT.601 with standard range luma (16-235)
[DEBUG] (NvV4l2ElementPlane.cpp:522) :Capture Plane:Reqbuf returned 22 buffers
[DEBUG] (NvV4l2ElementPlane.cpp:556) :Capture Plane:STREAMON successful
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 0
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 1
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 2
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 3
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 4
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 5
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 6
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 7
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 8
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 9
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 10
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 11
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 12
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 13
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 14
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 15
[DEBUG] (NvV4l2ElementPlane.cpp:260) :Capture Plane:Qed buffer 16
Segmentation fault (core dumped)

I produced this segmentfault as these steps:
First, run samples/01_video_encode/video_encode to produce a H264 file from a yuv stream file (1111.yuv of yuv420 8bit);
Second, try samples/00_video_decode/video_decode to recover a yuv stream file from this H264 file, it crashed.

Best regards!

[DaneLLL]

Hi,
The versions do not match. Please install the samples through SDKManager. After the installation, the samples will be present in

/usr/src/jetson_multimedia_api

[yzhk1015]

First， thx for your reply, it works!
However, I’ve met another problem. Now I can get the yuv stream from h264, however it seems to be abnormal.

Could u pls check this again? Attached two images were both decoded from sample_outdoor_car_1080p_10fps.h264, the former is by sample/00_video/decode, and the later is by ffmpeg(ffmpeg -i ./sample_outdoor_car_1080p_10fps.h264 -pix_fmt nv12 sample_h264_ffmpeg_dec.yuv)

[DaneLLL]

Hi,
We don’t observe the issue. Do you see this phenomenon in playback also? It is supposed to work fine in both saving to a file and video playback.

[yzhk1015]

Hi,
I’ve tried sample/00_video_decode on render display, it’s abnormal as well.

[yzhk1015]

Hi, can you repeat this issue while sample/00_video_decode sample_outdoor_car_1080p_10fps.h264 as well?

Further more, I’ve tried on a jetpack 4.2.2 module, it run well.

[DaneLLL]

Hi,
We don’t observe the issue. You may try other version such as Jetpack 4.6.3 or 5.1. It should work well on either release.