Re: [FFmpeg-devel] [PATCH] tests/fate/image: add a test for half-float dwab compressed stream

[James Almer]

On 5/6/2025 5:44 PM, Michael Niedermayer wrote:

On Mon, May 05, 2025 at 04:44:06PM -0300, James Almer wrote:

Signed-off-by: James Almer <jamr...@gmail.com>
---
  tests/fate/image.mak                        | 3 +++
  tests/ref/fate/rgb-scanline-dwab-half-float | 6 ++++++
  2 files changed, 9 insertions(+)
  create mode 100644 tests/ref/fate/rgb-scanline-dwab-half-float

diff --git a/tests/fate/image.mak b/tests/fate/image.mak
index 042cf6438f..abf204f69f 100644
--- a/tests/fate/image.mak
+++ b/tests/fate/image.mak
@@ -124,6 +124,9 @@ fate-exr-rgb-scanline-pxr24-float-12x8: CMD = framecrc -i 
$(TARGET_SAMPLES)/exr/
  FATE_EXR += fate-exr-rgba-multiscanline-half-b44
  fate-exr-rgba-multiscanline-half-b44: CMD = framecrc -i 
$(TARGET_SAMPLES)/exr/rgba_multiscanline_half_b44.exr -vf scale -pix_fmt 
gbrapf32le

+fate-rgb-scanline-dwab-half-float: CMD = framecrc -i 
$(TARGET_SAMPLES)/exr/rgb_scanline_dwab_half_float.exr -vf scale -pix_fmt 
gbrpf32le
+
  FATE_EXR += fate-exr-rgb-scanline-float-b44
  fate-exr-rgb-scanline-float-b44: CMD = framecrc -i 
$(TARGET_SAMPLES)/exr/rgb_scanline_float_b44.exr -vf scale -pix_fmt gbrpf32le

new file mode 100644
index 0000000000..a5a1997785
--- /dev/null
+++ b/tests/ref/fate/rgb-scanline-dwab-half-float
@@ -0,0 +1,6 @@
+#tb 0: 1/25
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 512x512
+#sar 0: 1/1
+0,          0,          0,        1,  3145728, 0xbb11b00a

+FATE_EXR += fate-rgb-scanline-dwab-half-float diff --git a/tests/ref/fate/rgb-scanline-dwab-half-float b/tests/ref/fate/rgb-scanline-dwab-half-float

differnt result here: (on linux x86-64)

--- ./tests/ref/fate/rgb-scanline-dwab-half-float       2025-05-06 
22:40:40.017406113 +0200
+++ tests/data/fate/rgb-scanline-dwab-half-float        2025-05-06 
22:40:53.297513198 +0200
@@ -3,4 +3,4 @@
  #codec_id 0: rawvideo
  #dimensions 0: 512x512
  #sar 0: 1/1
-0,          0,          0,        1,  3145728, 0xbb11b00a
+0,          0,          0,        1,  3145728, 0x2a15f7aa
Test rgb-scanline-dwab-half-float failed. Look at 
tests/data/fate/rgb-scanline-dwab-half-float.err for details.

Yeah, I can reproduce it, and even if i add "sws_flags +accurate_rnd+bitexact" i get the same results (0xbb11b00a on Win64, 0x2a15f7aa on Linux x86-64). I also get a different hash in both targets if i don't rescale to gbrpf32, so the problem is not in swscale. Neither Valgrind or gcc-usan complain, so I'm not sure what could be producing this difference.

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