[FIX] Unexpected behavior of get_write_interval

[IshanGrover2004]

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---

Closes #1606

Issue addresed

This pull request addresses issue #1606 where the get_write_interval function incorrectly returns (0,209) for a packet does not contain captions, implying that caption packets are available from index 0 to 209 which needs to be corrected.

Correction Made

The correction ensures that the correct interval (0,0) is returned, indicating that there are no captions available to write.

Implementation Details

By initialising last variable which stores last caption available by 0

[thealphadollar]

LGTM. I'm just wondering why the CI is failing 🤔

Please wait for @cfsmp3's review.

[IshanGrover2004]

LGTM. I'm just wondering why the CI is failing 🤔

Yeah mac CI fails for the hardsubx part which is not even touched

[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 f08febf...:

Report Name	Tests Passed
Broken	12/13
CEA-708	14/14
DVB	4/7
DVD	3/3
DVR-MS	2/2
General	16/27
Hauppage	1/3
MP4	2/3
NoCC	10/10
Options	82/86
Teletext	21/21
WTV	0/13
XDS	27/34

All tests passing on the master branch were passed completely.

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

• ccextractor --out=sami --latin1 --autoprogram 5b4e0a6034..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 85271be4d2..., Last passed: Never
• ccextractor --stdout --quiet --no-fontcolor 79a51f3500..., Last passed: Never
• ccextractor --stdout --quiet --no-fontcolor 767b546f96..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 1974a299f0..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 132d7df7e9..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 99e5eaafdc..., Last passed: Never
• ccextractor --autoprogram --out=srt --latin1 b22260d065..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 7aad20907e..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla c41f73056a..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 5d3a29f9f8..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 15feae9133..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 95dd33c6f1..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 01509e4d27..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 15feae9133..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --hauppauge --latin1 553d78e755..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --hauppauge --ucla --latin1 553d78e755..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --bom --latin1 8849331dda..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 --output-field 1 a65d39ccb3..., Last passed: Test 4898
• ccextractor --out=spupng c83f765c66..., Last passed: Test 4855
• ccextractor --capfile /repository/Dictionary/MattS_dictionary.txt c83f765c66..., Last passed: Never
• ccextractor --in=es dc7169d7c4..., Last passed: Test 4898
• ccextractor --out=srt --latin1 f23a544ba8..., Last passed: Test 4881
• ccextractor --out=srt --latin1 97cc394d87..., Last passed: Test 4880
• ccextractor --out=srt --latin1 10f0f77cf4..., Last passed: Test 4881
• ccextractor --out=srt --latin1 df3b4d62d3..., Last passed: Test 4881
• ccextractor --out=srt --latin1 d7e7dbdf68..., Last passed: Test 4898
• ccextractor --out=srt --latin1 76734ac4a7..., Last passed: Test 4898
• ccextractor --out=srt --latin1 c791382c94..., Last passed: Test 4898
• ccextractor --out=srt --latin1 f673b2f916..., Last passed: Test 4898
• ccextractor --out=srt --latin1 da75bdee47..., Last passed: Test 4898
• ccextractor --out=srt --latin1 bd6f33a669..., Last passed: Test 4898
• ccextractor --out=srt --latin1 0e5e6b26be..., Last passed: Test 4898
• ccextractor --out=srt --latin1 a226cc302d..., Last passed: Test 4898
• ccextractor --out=srt --latin1 ae6327683e..., Last passed: Test 4898
• ccextractor --autoprogram --out=smptett --latin1 --ucla e274a73653..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 --ucla b22260d065..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --xds --ucla c813e713a0..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 --ucla c813e713a0..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 --ucla c8dc039a88..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 7d3f25c32c..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 --ucla 7d3f25c32c..., Last passed: Test 4898

Congratulations: Merging this PR would fix the following tests:

• ccextractor --autoprogram --out=srt --latin1 1d9731bd80..., Last passed: Test 4898
• ccextractor --out=srt --latin1 --autoprogram 73d9313d64..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 8e8229b88b..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 7236304cfc..., Last passed: Test 4898
• ccextractor --out=ttxt --latin1 001dd8cdf7..., Last passed: Test 4898
• ccextractor --out=srt --latin1 06b3a9237d..., Last passed: Test 4898
• ccextractor --out=srt --latin1 83f8cceb74..., Last passed: Test 4898
• ccextractor --out=srt --latin1 611b4a9235..., Last passed: Test 4898
• ccextractor --out=srt --latin1 b46e9e8e3f..., Last passed: Test 4898
• ccextractor --out=srt --latin1 89e417e622..., Last passed: Test 4898
• ccextractor --out=srt --latin1 d59eadc4ed..., Last passed: Test 4898
• ccextractor --out=srt --latin1 4d4e938ef6..., Last passed: Test 4898
• ccextractor --service 1 --out=txt --no-bom --no-rollup ea83ff7bcb..., Last passed: Test 4898
• ccextractor --service 1 --out=txt f17524b53f..., Last passed: Test 4898
• ccextractor --service 1 --out=txt da904de35d..., Last passed: Test 4898
• ccextractor --service 1 --out=txt 80848c45f8..., Last passed: Test 4898
• ccextractor --service 1 --out=txt --no-bom --no-rollup b5d6aad89f..., Last passed: Test 4898
• ccextractor --service 1[EUC-KR] --out=txt --no-rollup b5d6aad89f..., Last passed: Test 4898
• ccextractor --service 1 --out=srt da904de35d..., Last passed: Test 4898
• ccextractor --service 1 --out=sami da904de35d..., Last passed: Test 4898
• ccextractor --service 1 --out=ttxt da904de35d..., Last passed: Test 4898
• ccextractor --service 1[EUC-KR] b5d6aad89f..., Last passed: Test 4898
• ccextractor --service 1[EUC-KR] --no-rollup b5d6aad89f..., Last passed: Test 4898
• ccextractor --service all da904de35d..., Last passed: Test 4898
• ccextractor --service all[EUC-KR] b5d6aad89f..., Last passed: Test 4898
• ccextractor --service 1,2[UTF-8],3[EUC-KR],54 --out=txt da904de35d..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 1020459a86..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 f1422b8bfe..., Last passed: Test 4898
• ccextractor --datapid 5603 --autoprogram --out=srt --latin1 --teletext 85c7fc1ad7..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 d41b53b504..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 5ae2007a79..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 1e44efd810..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 add511677c..., Last passed: Test 4898
• ccextractor --wtvconvertfix --autoprogram --out=srt --latin1 acf871cbfd..., Last passed: Test 4898
• ccextractor --wtvconvertfix --autoprogram --out=srt --latin1 5cbb21adb6..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 9a496d3828..., Last passed: Test 4898
• ccextractor --out=srt --latin1 --autoprogram 56c9f34548..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 e9b9008fdf..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 c032183ef0..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 27e46255f0..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 d037c7509e..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 70000200c0..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 6dc772d881..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla dab1c1bd65..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla adce82fd39..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla ab9cf8cfad..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --output-field 2 5d3a29f9f8..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --output-field 2 c41f73056a..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 --sentencecap c032183ef0..., Last passed: Test 4898
• ccextractor --autoprogram --out=bin --latin1 c032183ef0..., Last passed: Test 4898
• ccextractor --out=srt --latin1 --autoprogram 29e5ffd34b..., Last passed: Test 4898
• ccextractor --hauppauge --autoprogram --out=srt --latin1 a03b5b2a56..., Last passed: Test 4898
• ccextractor --in=mp4 --out=srt --latin1 b2771c84c2..., Last passed: Test 4898
• ccextractor --in=mp4 --out=srt --latin1 5df914ce77..., Last passed: Test 4898
• ccextractor --mp4vidtrack --autoprogram --out=ttxt --latin1 adc0a818c3..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 08bdf0e2c1..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 bee139671a..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 3842d00925..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 80af83c038..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 837b02f722..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 41dab6b2a7..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 4b117b4d66..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 26ee6add4d..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds fca0dce412..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 --output-field 2 a65d39ccb3..., Last passed: Test 4898
• ccextractor --autoprogram c83f765c66..., Last passed: Test 4898
• ccextractor --service 1 c83f765c66..., Last passed: Test 4898
• ccextractor --in=ts c83f765c66..., Last passed: Test 4898
• ccextractor --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --out=sami c83f765c66..., Last passed: Test 4898
• ccextractor --out=dvdraw c83f765c66..., Last passed: Test 4898
• ccextractor --out=txt c83f765c66..., Last passed: Test 4898
• ccextractor --out=ttxt c83f765c66..., Last passed: Test 4898
• ccextractor --out=smptett c83f765c66..., Last passed: Test 4898
• ccextractor --goptime c83f765c66..., Last passed: Test 4898
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• ccextractor --90090 c83f765c66..., Last passed: Test 4898
• ccextractor --myth c83f765c66..., Last passed: Test 4898
• ccextractor --program-number 1 c83f765c66..., Last passed: Test 4898
• ccextractor --datapid 256 c83f765c66..., Last passed: Test 4898
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• ccextractor --datastreamtype 2 --streamtype 2 c83f765c66..., Last passed: Test 4898
• ccextractor --no-autotimeref c83f765c66..., Last passed: Test 4898
• ccextractor --bom c83f765c66..., Last passed: Test 4898
• ccextractor --no-bom c83f765c66..., Last passed: Test 4898
• ccextractor --unicode c83f765c66..., Last passed: Test 4898
• ccextractor --utf8 c83f765c66..., Last passed: Test 4898
• ccextractor --latin1 c83f765c66..., Last passed: Test 4898
• ccextractor --no-fontcolor c83f765c66..., Last passed: Test 4898
• ccextractor --no-typesetting c83f765c66..., Last passed: Test 4898
• ccextractor --trim c83f765c66..., Last passed: Test 4898
• ccextractor --sentencecap c83f765c66..., Last passed: Test 4898
• ccextractor --unixts 5 --out=txt c83f765c66..., Last passed: Test 4898
• ccextractor --out=txt --datets c83f765c66..., Last passed: Test 4898
• ccextractor --out=txt --sects c83f765c66..., Last passed: Test 4898
• ccextractor --out=txt --UCLA c83f765c66..., Last passed: Test 4898
• ccextractor --out=txt --lf c83f765c66..., Last passed: Test 4898
• ccextractor --autodash --trim c83f765c66..., Last passed: Test 4898
• ccextractor --bufferinput c83f765c66..., Last passed: Test 4898
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• ccextractor --buffersize 1M c83f765c66..., Last passed: Test 4898
• ccextractor --dru c83f765c66..., Last passed: Test 4898
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• ccextractor --startat 4 --endat 7 c83f765c66..., Last passed: Test 4898
• ccextractor --no-codec dvbsub c83f765c66..., Last passed: Test 4898
• ccextractor --debug --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --608 --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --708 --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --goppts --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --xdsdebug --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --vides --out=srt c83f765c66..., Last passed: Test 4898
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• ccextractor --no-sync --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --fullbin --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --parsedebug --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --parsePAT --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --parsePMT --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --investigate-packets --out=srt c83f765c66..., Last passed: Test 4898
• ccextractor --in=ps e9b9008fdf..., Last passed: Test 4898
• ccextractor --in=asf 6395b281ad..., Last passed: Test 4898
• ccextractor --in=wtv b46e9e8e3f..., Last passed: Test 4898
• ccextractor --in=bin 988d4e8bba..., Last passed: Test 4898
• ccextractor --in=raw fb79021542..., Last passed: Test 4898
• ccextractor --in=mp4 b2771c84c2..., Last passed: Test 4898
• ccextractor --mp4vidtrack 5df914ce77..., Last passed: Test 4898
• ccextractor --wtvconvertfix acf871cbfd..., Last passed: Test 4898
• ccextractor --wtvmpeg2 10f0f77cf4..., Last passed: Test 4898
• ccextractor --hauppauge d6df1b227a..., Last passed: Test 4898
• ccextractor --xmltv --out=null 96efd279cf..., Last passed: Test 4898
• ccextractor --codec dvbsub --out=spupng 85271be4d2..., Last passed: Test 4898
• ccextractor --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Test 4898
• ccextractor --startcreditsnotbefore 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Test 4898
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• ccextractor --startcreditsforatleast 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Test 4898
• ccextractor --startcreditsforatmost 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Test 4898
• ccextractor --endcreditstext "CCextractor Ends crdit Testing" addf5e2fc9..., Last passed: Test 4898
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• ccextractor --tpage 801 4e56e88ba4..., Last passed: Test 4898
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• ccextractor --datapid 2310 --autoprogram --out=srt --latin1 e639e54550..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 4e56e88ba4..., Last passed: Test 4898
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• ccextractor --autoprogram --out=srt --latin1 --ucla f41d4c29a1..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 88cd42b89a..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 --ucla 88cd42b89a..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 --output-field 2 --ucla 88cd42b89a..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 7f41299cc7..., Last passed: Test 4898
• ccextractor --autoprogram --out=srt --latin1 --ucla 7f41299cc7..., Last passed: Test 4898
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 0069dffd21..., Last passed: Test 4898

Check the result page for more info.