ffmpeg-headless: fix riscv64-linux build

[liberodark]

Fix this issue :

       > TEST    ffmpeg-streamcopy-t
       > TEST    ffmpeg-loopback-decoding
       > TEST    acodec-pcm-alaw
       > TEST    acodec-pcm-mulaw
       > TEST    acodec-pcm-s16be
       > TEST    acodec-pcm-s16le
       > TEST    acodec-pcm-u16be
       > TEST    acodec-pcm-u16le
       > TEST    acodec-pcm-s8
       > --- ./tests/ref/fate/ffmpeg-filter-in-eof       1970-01-01 00:00:01.000000000 +0000
       > +++ tests/data/fate/ffmpeg-filter-in-eof    2026-05-29 14:03:33.034874712 +0000
       > @@ -47,7 +47,7 @@
       >  0,         41,         41,        1,   152064, 0x8e364e18
       >  0,         42,         42,        1,   152064, 0xb15d38c8
       >  0,         43,         43,        1,   152064, 0xf25f6acc
       > -0,         44,         44,        1,   152064, 0xf34ddbff
       > +0,         44,         44,        1,   152064, 0x9b995435
       >  0,         45,         45,        1,   152064, 0xfc7bf570
       >  0,         46,         46,        1,   152064, 0x9dc72412
       >  0,         47,         47,        1,   152064, 0x445d1d59
       > TEST    acodec-pcm-u8
       > Test ffmpeg-filter-in-eof failed. Look at tests/data/fate/ffmpeg-filter-in-eof.err for details.
       > make: *** [tests/Makefile:322: fate-ffmpeg-filter-in-eof] Error 1
       > make: *** Waiting for unfinished jobs....
       > TEST    acodec-pcm-s24be

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.
• Follows the automation/AI policy.

[liberodark]

nixpkgs-review result

Generated using nixpkgs-review-gha

Command: nixpkgs-review pr 525606
Commit: c4e17684e36a9cfb2e1e9f6c92160d91561552e6 (subsequent changes)
Merge: 78bb8e718ab0d91dd247b605996062e64836a05e

Logs: https://github.com/liberodark/nixpkgs-review-gha/actions/runs/26645126435

---

x86_64-linux

✅ No rebuilds

---

aarch64-linux

✅ No rebuilds

---

x86_64-darwin

✅ No rebuilds

---

aarch64-darwin

✅ No rebuilds

[dotlambda]

Please add a comment with the URL to an upstream PR.

[liberodark]

Hi,

Sorry have not upstream this fix have only do that for fix build issue.

Best Regards

[dotlambda]

Would you mind opening an upstream PR? We don't want to carry the patch forever