00_video_decode with x264 encoded stream fails

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

Is there anything preventing an x264-encoded bitstream from being decoded? I’m generating an x264-encoded bitstream via ffmpeg:

$ ffmpeg -f lavfi -i testsrc=duration=5 -c:v libx264 -f h264 test.h264

Then decoding it with 00_video_decode:

$ ./video_decode H264 --disable-rendering -o ~/test.yuv ~/test.h264
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 
Setting frame input mode to 1 
Input file read complete
Starting decoder capture loop thread
[NvMediaParserParse:357] Video parser parse failed: 0[NvMediaParserParse:357] Video parser parse failed: 0Got EoS at output plane
[ERROR] (NvV4l2Element.cpp:115) <dec0> Error while DQing event: Invalid argument
Error in dequeueing decoder event
Exiting decoder capture loop thread
App run failed

Not sure why it’s failing to parse. The sample, of course, works if I use NvVideoEncoder to generate the video. Similarly,

$ gst-launch-1.0 filesrc location=test.h264 ! h264parse ! avdec_h264 ! fakesink

has no issues playing the file.

2

Ah, ok apparently it’s because the default pix format on ffmpeg-configured x264 is yuv444p which isn’t supported by the decoder? If I generate the file with

ffmpeg -f lavfi -i testsrc=duration=5 -pix_fmt yuv420p -c:v libx264 -f h264 test.h264

it works correctly. Why is that?

4

Hi,
Decoding YUV444 stream is not supported on Jetson Nano. Please encode the stream from YUV420 data.

6

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