Video convert sample results are missing?

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
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#1

Hello.

Please help me about the vaidity of the Jetson MM API sample software result.

My environment is below.
HW: Jetson Xavier NX
OS: Jetpack 4.6

I’m trying to video convert from NV12 to ABGR32 using “jetson_multimedia_api/samples/07_video_convert”.
The output is different from what I expected.
Below are the executed commands, input, expected and actual output values.


[bt601 limited -> BGRA]
  - command: ./video_convert ./128.raw 1920 1080 NV12 ./output/128_601lim_BGRA.raw 1920 1080 ABGR32
  - input: bt601 limited(Y=128, U=128, V=128)
  - actually output: BGRA(B=142, G=142, R=142)
  - expected output: BGRA(B=130, G=130, R=130)


[bt601 full -> BGRA]
  - command: ./video_convert ./16.raw  1920 1080 NV12_ER ./output/16_601full_BGRA.raw 1920 1080 ABGR32
  - input: bt601 full(Y=16, U=128, V=128)
  - actually output: BGRA(B=0, G=0, R=0)
  - expected output: BGRA(B=16, G=16, R=16)

  - command: ./video_convert ./128.raw 1920 1080 NV12_ER ./output/128_601full_BGRA.raw 1920 1080 ABGR32
  - input: bt601 full(Y=128, U=128, V=128)
  - actually output: BGRA(B=142, G=142, R=142)
  - expected output: BGRA(B=128, G=128, R=128)

  - command: ./video_convert ./235.raw 1920 1080 NV12_ER ./output/235_601full_BGRA.raw 1920 1080 ABGR32
  - input: bt601 full(Y=235, U=128, V=128)
  - actually output: BGRA(B=255, G=255, R=255)
  - expected output: BGRA(B=235, G=235, R=235)


[bt709 limited -> BGRA]
  - command: ./video_convert ./128.raw 1920 1080 NV12_709 ./output/128_709lim_BGRA.raw 1920 1080 ABGR32
  - input: bt709 limited(Y=128, U=128, V=128)
  - actually output: BGRA(B=142, G=142, R=142)
  - expected output: BGRA(B=130, G=130, R=130)


[bt709 full -> BGRA]
  - command: ./video_convert ./16.raw  1920 1080 NV12_709_ER ./output/16_709full_BGRA.raw 1920 1080 ABGR32
  - input: bt709 full(Y=16, U=128, V=128)
  - actually output: BGRA(B=31, G=31, R=31)
  - expected output: BGRA(B=16, G=16, R=16)

  - command: ./video_convert ./128.raw 1920 1080 NV12_709_ER ./output/128_709full_BGRA.raw 1920 1080 ABGR32
  - input: bt709 full(Y=128, U=128, V=128)
  - actually output: BGRA(B=140, G=140, R=140)
  - expected output: BGRA(B=128, G=128, R=128)

  - command: ./video_convert ./235.raw 1920 1080 NV12_709_ER ./output/235_709full_BGRA.raw 1920 1080 ABGR32
  - input: bt709 full(Y=235, U=128, V=128)
  - actually output: BGRA(B=238, G=238, R=238)
  - expected output: BGRA(B=235, G=235, R=235)
#3

Hi,
It looks like you expect the range of RGBA in [16, 235] but it is always in [0, 255]. Is this correct?

#4

Thank you for reply.

It looks like you expect the range of RGBA in [16, 235] but it is always in [0, 255]. Is this correct?

Yes, it is one of my issue.
I have 3 issues.

  1. I set bt601 full range conversion(NV12_ER), but outputs are looks like limited range conversion results.
  2. I set bt709 full range conversion(NV12_709_ER), but outputs are incomprehensible results.
  3. I input Y=128 data, but conversion results BGR data are not match, both full and limited range setting.
#5

Hi,
Are you able to grade to Jetpack 4.6.1 and give it a try?

#7

Thank you for reply.

Are you able to grade to Jetpack 4.6.1 and give it a try?

I check JetPack 4.6.1.
The results are better than JetPack 4.6.
But bt601 full results are not match what ( expected.

  • OK(match output and expected result): bt601 limited, bt709 limited, bt709 full
  • NG(not match output and expected result): bt601 full
[bt601 full -> BGRA]
  - command: ./video_convert ./16.raw  1920 1080 NV12_ER ./output/16_601full_BGRA.raw 1920 1080 ABGR32
  - input: bt601 full(Y=16, U=128, V=128)
  - actually output: BGRA(B=0, G=0, R=0)
  - expected output: BGRA(B=16, G=16, R=16)

  - command: ./video_convert ./128.raw 1920 1080 NV12_ER ./output/128_601full_BGRA.raw 1920 1080 ABGR32
  - input: bt601 full(Y=128, U=128, V=128)
  - actually output: BGRA(B=130, G=130, R=130)
  - expected output: BGRA(B=128, G=128, R=128)

  - command: ./video_convert ./235.raw 1920 1080 NV12_ER ./output/235_601full_BGRA.raw 1920 1080 ABGR32
  - input: bt601 full(Y=235, U=128, V=128)
  - actually output: BGRA(B=255, G=255, R=255)
  - expected output: BGRA(B=235, G=235, R=235)
#9

Hi,
Could you share the files(16.raw, 128.raw, 235.raw) in bt601 full? Or how we can generate the test files.

#10

To generate the raw files, please type below at Linux command line.

[16.raw]
for ((i=0;i<2073600;i++)); do echo ‘10’; done > 0x10.txt
for ((i=0;i<1036800;i++)); do echo ‘80’; done > 0x80.txt
cat 0x10.txt 0x80.txt | xxd -r -p >16.raw

[128.raw]
cat 0x80.txt 0x80.txt 0x80.txt| xxd -r -p >128.raw

[235.raw]
for ((i=0;i<2073600;i++)); do echo ‘eb’; done > 0xeb.txt
cat 0xeb.txt 0x80.txt| xxd -r -p >235.raw

1 Like
#12

Hi,
Please try attached prebuilt lib:

/usr/lib/aarch64-linux-gnu/tegra/libnvbuf_utils.so

r32_7_TEST_libnvbuf_utils.zip (18.7 KB)