[FIX] -out=spupng with EIA608/teletext: offset values in XML may be not correct #893

[gaurav02081]

[FIX]

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---

[FIX] -out=spupng with EIA608/teletext: offset values in XML may be not correct #893

The issue occurs because the offsets were hardcoded for a 544×390 subtitle image centered on a 720×480 NTSC screen, while the text-to-PNG renderer generates PNGs with different (dynamic) dimensions (e.g. 600px wide and variable height). This results in visibly misaligned subtitles, especially for Teletext (PAL) sources.

This PR removes the hardcoded NTSC assumptions and calculates SPUPNG offsets dynamically based on the actual rendered PNG geometry and the target screen resolution.

Key changes =>

1. Store the real PNG dimensions (img_w, img_h) in spupng_t

2 .Introduce an is_pal flag in encoder_ctx to distinguish PAL (576 lines) vs NTSC (480 lines)

3. Capture final canvas dimensions during text-to-PNG rendering

4.Add a helper to compute centered xOffset / yOffset dynamically

5. Enforce even yOffset to prevent interlacing flicker on DVD/SPU

6. Apply the new logic only to the text-to-SPUPNG pipeline, leaving the bitmap path unchanged

7. This aligns the text-based SPUPNG output with the already-correct bitmap SPUPNG behavior.

So ,Subtitles are correctly positioned regardless of PNG width/height (PNG size decides the offset — not hardcoded values.).

in the given image i have drawn the flow of this fix .

[cfsmp3]

What video file did you use to test this?

[gaurav02081]

Testing was done mostly using tests/02-BBC2.No.Such.Thing.As.News.ts, which is a BBC PAL, 720

I manually checked the generated PNG size and the xoffset/yoffset information within the XML file, and I found that it didn't conform to the formula for centering, resulting in this patch.

This PR addresses the problem by -

correcting the offset calculation order (offsets are now calculated after PNG generation),

the removal of NTSC hardcoded numbers,

applying the proper centering formula, even alignment.

During testing, I also noticed that format detection in Teletext may not be represented in the encoder context (in_fileformat / is_pal) at SPUPNG. I’ve chosen to keep this PR just on the offset logic, rather than making changes to format detection.

The NTSC/EIA-608 part of the pipeline remains the same; the current Usa.ts functionality breaks on my Mac environment with respect to font support, not offset logic.

[ccextractor-bot]

CCExtractor CI platform finished running the test files on linux. Below is a summary of the test results, when compared to test for commit e3b0def...:

Report Name	Tests Passed
Broken	13/13
CEA-708	14/14
DVB	7/7
DVD	3/3
DVR-MS	2/2
General	24/27
Hardsubx	1/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	80/86
Teletext	21/21
WTV	13/13
XDS	34/34

NOTE: The following tests have been failing on the master branch as well as the PR:

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Congratulations: Merging this PR would fix the following tests:

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• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 7f41299cc7..., Last passed: Never
• ccextractor --autoprogram --out=srt --latin1 --ucla 7f41299cc7..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 0069dffd21..., Last passed: Never

All tests passing on the master branch were passed completely.

Check the result page for more info.

[ccextractor-bot]

CCExtractor CI platform finished running the test files on windows. Below is a summary of the test results, when compared to test for commit e3b0def...:

Report Name	Tests Passed
Broken	13/13
CEA-708	14/14
DVB	6/7
DVD	3/3
DVR-MS	2/2
General	24/27
Hardsubx	1/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	80/86
Teletext	21/21
WTV	13/13
XDS	34/34

Your PR breaks these cases:

• ccextractor --autoprogram --out=srt --latin1 --quant 0 85271be4d2...
• ccextractor --autoprogram --out=ttxt --latin1 1974a299f0...
• ccextractor --autoprogram --out=ttxt --latin1 --ucla dab1c1bd65...
• ccextractor --out=srt --latin1 --autoprogram 29e5ffd34b...
• ccextractor --out=spupng c83f765c66...
• ccextractor --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --startcreditsnotbefore 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --startcreditsnotafter 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --startcreditsforatleast 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --startcreditsforatmost 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Check the result page for more info.