SDR++ Crashes on MacOS with RTL-SDR V4 at 250kHz Sample Rate

[Flame4975]

WARNING: Filling out the template below is NOT optional. Issues not filling out this template will be closed without review.

FIRST: Before reporting any bug, make sure that the bug you are reporting has not been reported before. Also, try to use the nightly version if possible in case I've already fixed the bug.

Hardware

• CPU: M5
• RAM: 32GB
• GPU: M5 10-Core
• SDR: RTL-SDR v4

Software

• Operating System: macOS Tahoe 26.2
• SDR++: v1.2.1 (Built at 06:58:05, Dec 12 2025)

Bug Description
Whenever I'm using the RTL-SDR v4 at 250kHz sample rate, the app crashes after about 5-20 seconds. This doesn't occur on the other sample rates I used (1.024kHz, 2.048kHz, 2.4MHz, 3.2MHz, etc).

Steps To Reproduce

1. Open SDR++.
2. Use RTL-SDRBlog V4 [00000001] at 250kHz.
3. Press play and wait around 15 seconds or so.

Only If SDR++ fails to lauch or the SDR fails to start:
Run SDR++ from a command line window with special parameters:

• On Windows, open a terminal and cd to SDR++'s directory and run .\sdrpp.exe -c (if running SDR++ version 1.0.4 or older, use -s instead, though you should probably update SDR++ instead...)
• On Linux: Open a terminal and run sdrpp -c
• On MacOS: Open a terminal and run /path/to/the/SDR++.app/Contents/MacOS/sdrpp -c
  Then, post the entire logs from start to after the issue. DOT NOT truncate to where you think the error is...

Screenshots
Here is a screen recording of using 1.024kHz (No crash), VS 250kHz (App crashes).
https://github.com/user-attachments/assets/027b2a36-703b-4f47-b644-60602d5f688b

Additional info
Additionally, here is both the SDR++ Log, and the Crash Report from MacOS
sdrpp_crash.log - SDR++ Report
SDR++ Crash Report.log - MacOS Crash Report

[AlexandreRouma]

Can't replicate at all on my mac. Will need to wait until someone else can replicate it.
In the mean time I'd suggest making sure that the usb cable of the dongle makes a proper connection and that the dongle gets enough power.

In any case, never run the RTL-SDR at 250KS/s unless you absolutely have to for network bandwidth reasons. The RTL doesn't have the necessary filters for 250KHz and it results in very bad selectivity.