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Original question:

TDA4VM: [TDA4VM]OpenVX: APP_single_cam can not run after increase NUM_BUFS to 5 on SDK7.0

TDA4AEN-Q1: Green Frame Issue on CSI-TX with app_single_cam

yl chen
Prodigy 220 points
Part Number: TDA4AEN-Q1

Tool/software:

Hi TI Expert,

We are encountering an issue where green frames are occasionally observed on the CSI-TX output when running app_single_cam.

Please refer to the attached recording for reference:


Issue Description

  • The problem only occurs in the pipeline:
    Capture → VISS → LDC → CSI-TX

  • When we modify NUM_BUFS (via obj->num_cap_buf and tivxSetNodeParameterNumBufByIndex) to 6, the green frame issue seems to be resolved.

  • However, if we bypass LDC (pipeline: Capture → VISS → CSI-TX) and keep the default NUM_BUFS=4, the green frame issue does not occur.

  • If we set NUM_BUFS=6 in this bypass case, the pipeline stalls at CSI-TX and the FPS drops to 0.

Question

Do you have any insights into what could be causing this behavior?

Thanks,
YL

  • 0
    TI__Guru 51303 points

    Hi YL,

    Due to a regional holiday, our India team is currently out of the office. Please expect a 1~2 day delay in responses.

    Apologies for the delay, and thank you for your patience.

    Regards,

    Takuma

  • 0
    TI__Guru**** 477195 points

    Hi YL,

    First of all, which SDK release are you using? I think in earlier release, there was a bug in the PDK CSIRX driver, which can potentially cause this issue. Can you please check this dataflow on the latest SDK release.

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    Prodigy 220 points

    Hi Brijesh,

    We’re on PROCESSOR-SDK-RTOS-J722S v10.01.00.04 (Dec 18, 2024).

    Notably, if we bypass LDC and run Capture → VISS → CSI-TX, the green frames never appear. Does this point to a buffer-depth/latency interaction around LDC on this SDK version?

    Best,
    YL

  • 0 in reply to yl chen
    TI__Guru**** 477195 points

    Hi YL,

    This release has the fix in CSIRX driver. So the issue may not be related to CSIRX. 

    Can you please share some information about this data chain?

    - How many channels are you capturing from the CSIRX?

    - Are VISS and LDC nodes replicated?

    - How are you creating LDC node's output image and how are you passing it as object array to CSITX node? 

    Regards,

    Brijesh