Track location fails on gaps in track numbering

Lots of FRENCH/MULTi releases have this issue. One example: Batman.The.Animated.Series.S01.VOL01.MULTi.BDRip.x264-D4KiD. Release has the same issue as #177, but by extracting and trying reconstruction from all extracted video files we can identify that batman.the.animated.series.s01e13.multi.bdrip.x264-d4kid.mkv is the correct video file, since it is the only file that leads to a different error:

$ for f in ../*.mkv; do echo $f; srs batman.the.animated.series.s01.vol01.multi.bdrip.x264-d4kid-sample.srs $f; done
../batman.the.animated.series.s01e01.multi.bdrip.x264-d4kid.mkv
SRS Load Complete...          Elapsed Time: 0.00s
Track Location Complete...    Elapsed Time: 2.06s

Unable to locate track signature for track 1. Aborting.
../batman.the.animated.series.s01e02.multi.bdrip.x264-d4kid.mkv

<snip>

../batman.the.animated.series.s01e13.multi.bdrip.x264-d4kid.mkv
SRS Load Complete...          Elapsed Time: 0.00s
Track Location Complete...    Elapsed Time: 1.82s

Unable to locate track signature for track 4. Aborting.

Information on intended sample and source file:

$ srs -i Sample/batman.the.animated.series.s01.vol01.multi.bdrip.x264-d4kid-sample.mkv 
File Details:   Size           CRC
                -------------  --------
                    8,296,713  8D892105


Track Details:  Track  Length         Codec
                -----  -------------  --------------------
                    1      6,061,282  V_MPEG4/ISO/AVC
                    2      1,126,306  A_AAC
                    3      1,074,791  A_AAC
                    4            435  S_TEXT/UTF8
                    5            407  S_TEXT/UTF8

Parse Details:  Metadata     Attachments   Track Data     Total
                -----------  ------------  -------------  -------------
                     33,492             0      8,263,221      8,296,713

$ srs -i batman.the.animated.series.s01e13.multi.bdrip.x264-d4kid.mkv 
File Details:   Size           CRC
                -------------  --------
                  166,425,592  2D1C814E


Track Details:  Track  Length         Codec
                -----  -------------  --------------------
                    1    121,430,393  V_MPEG4/ISO/AVC
                    2     22,658,771  A_AAC
                    3     21,797,023  A_AAC
                    6          6,090  S_TEXT/UTF8
                    7          7,066  S_TEXT/UTF8

Parse Details:  Metadata     Attachments   Track Data     Total
                -----------  ------------  -------------  -------------
                    526,249             0    165,899,343    166,425,592

Stream IDs seem to mismatch between the two files. Track 4 in sample ⊆ track 6 in source file; track 5 in sample ⊆ track 7 in source file. Manually remapping the tracks in the source file by remuxing the file (e.g. ffmpeg -i batman.the.animated.series.s01e13.multi.bdrip.x264-d4kid.mkv -map 0 -codec copy test.mkv) leads to following file:

File Details:   Size           CRC
                -------------  --------
                  167,042,863  4EA5E467


Track Details:  Track  Length         Codec
                -----  -------------  --------------------
                    1    121,430,393  V_MPEG4/ISO/AVC
                    2     22,658,771  A_AAC
                    3     21,797,023  A_AAC
                    4          6,090  S_TEXT/UTF8
                    5          7,066  S_TEXT/UTF8

Parse Details:  Metadata     Attachments   Track Data     Total
                -----------  ------------  -------------  -------------
                  1,143,520             0    165,899,343    167,042,863

Attempted reconstruction from remuxed file succeeds.

srs batman.the.animated.series.s01.vol01.multi.bdrip.x264-d4kid-sample.srs ../test.mkv 
SRS Load Complete...          Elapsed Time: 0.00s
Track Location Complete...    Elapsed Time: 1.06s
Track Extraction Complete...  Elapsed Time: 1.36s
Rebuild Complete...           Elapsed Time: 1.49s

File Details:   Size           CRC
                -------------  --------
Expected    :       8,296,713  8D892105
Actual      :       8,296,713  8D892105


Successfully rebuilt sample: batman.the.animated.series.s01.vol01.multi.bdrip.x264-d4kid-sample.mkv

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