With respect to size of outputfile related to 00_video_decode

Autonomous Machines Jetson & Embedded Systems Jetson Nano
#1

Hello
Thank you for your answer.

$ ./video_decode H264 -o ./s.yuv …/…/data/Video/sample_outdoor_car_1080p_10fps.h264

The size of the output file s.yuv has been 1.8 gigabytes.
Can the capacity be reduced?
Are there any capacity options?

I would be grateful if you could give me a sample command when printing to yuv.

thank you.

There seems to be a problem with decoding
#3

Hi,
You may add logic of dumping single frame:

static  int dump = 1;
                /* Write raw video frame to file. */
                if (!ctx->stats && ctx->out_file && dump)
                {
                    /* Dumping two planes for NV12, NV16, NV24 and three for I420 */
                    dump_dmabuf(ctx->dst_dma_fd, 0, ctx->out_file);
                    dump_dmabuf(ctx->dst_dma_fd, 1, ctx->out_file);
                    if (ctx->out_pixfmt == 2)
                    {
                        dump_dmabuf(ctx->dst_dma_fd, 2, ctx->out_file);
                    }
dump = 0;
                }
There seems to be a problem with decoding
#4

I execute the following command:
./video_decode H264 …/…/data/Video/sample_outdoor_car_1080p_10fps.h264

An error message appears:

Set governor to performance before enabling profiler
Creating decoder in blocking mode
Opening in BLOCKING MODE
NvMMLiteOpen : Block : BlockType = 261
NVMEDIA: Reading vendor.tegra.display-size : status: 6
NvMMLiteBlockCreate : Block : BlockType = 261
Starting decoder capture loop thread
Video Resolution: 1920x1080
[INFO] (NvEglRenderer.cpp:109) Setting Screen width 1920 height 1080
line 1656:Input file read complete
Query and set capture successful
Segmentation fault (core dumped)

#5

Hi, DaneLLL.

Where to insert this logic of dumping single frame?

in NVEglRenderer.cpp file?
jetson_multimedia_api\samples\common\classes\NvEglRenderer.cpp

#6

Hi,

It is in video_decode_main.cpp. You can grep dump_dmabuf().

#7

Hi,

It looks to be certain issue in your system image. It is default command and should work fine. You may re-flash through SDKManager and run the sample in

/usr/src/jetson_multimedia_api/samples/00_video_decode
#8

Hi,DaneLLL:
Thank you for your reply!
I have a question to confirm with you:
I downloaded the sample code file from this connection[ L4T Jetson TX1 R28.3.2 Multimedia API].
Does it mean that my source code download is wrong?

My jetson nano configuration is as follows:
system:Ubuntu 18.04.4 LTS
jetpack:4.4 DP [ L4T 32.4.2 ]

#9

Hi,

It is wrong. Now the samples are installed through SDKManager. After the installation, please check

/usr/src/jetson_multimedia_api/
#10

Thanks!The sample is now working properly.
But,i used the jtop command to find that the hardware decoder was turned off and it seems to be decoding on the CPU.

2
2921×634 116 KB

Doesn’t this sample use a hardware decoder to decode the video file?

#11

Hi,
Please use tegrastats.

2 Likes
#12

Thank you very much!
I used the tegrastats command to find the hardware decoder running.

3
3948×319 105 KB

1 Like
#13

Hi @Arvin,

Hi, have you tried to run jtop with sudo? I see from your screen you run it without.
Usually NVDEC is available on tegrastats only when you run with sudo.

1 Like
#14

Hi,rbonghi:
Thank you for your warning!
Run jtop with sudo can see the hardware decoder working

1 Like
#15

Ok!

I will fix the encoding lines with a message. The output on jtop (without sudo) is wrong.

1 Like