Broken with libFLAC 1.4.0 through 1.4.2 ("internal psf_fseek() failed")

Some versions of libFLAC report an error when we try to seek to particular sample numbers:

• 1.3.3: working
• 1.3.4: working
• Broken by commit cbb039d2d629885a943a620f9828fdccec9cf28c
• 1.4.0: broken
• 1.4.1: broken
• 1.4.2: broken
• Fixed by commit 46bf04d0d74440a12be9508af508b4d373d696cf
• 1.4.3: working

(All tested only on Linux amd64.)

In the case of wfdb-python, this manifests as an exception "internal psf_fseek() failed" (but see also issue #486, which appears to be something different.)

Some examples from mimic4wdb/0.1.0:

filename                                       sample     possible byte range
p100/p10079700/85594648/85594648_0003e.dat     18229140   16277832-16286024
p101/p10100546/83268087/83268087_0113p.dat     2288000    1049471-1057663
p110/p11013146/82432904/82432904_0011e.dat     1686714    2026933-2084277
p132/p13208026/82342224/82342224_0006e.dat     18576787   17925601-17950177
p132/p13240081/87706224/87706224_0102p.dat     363771     322161-330353
p142/p14285792/87867111/87867111_0009e.dat     4161139    5495737-5503929
p155/p15552902/85078610/85078610_0017r.dat     3313501    1682872-1691064
p158/p15857793/84686667/84686667_0004e.dat     13244922   12714501-12722693
p160/p16096029/87730914/87730914_0010e.dat     9319846    12328985-12337177
p160/p16096029/87730914/87730914_0045r.dat     3254418    1713774-1721966
p166/p16644640/84209926/84209926_0022e.dat     1012957    1128680-1136872
p171/p17107892/83439223/83439223_0001e.dat     2026051    1807349-1815541
p174/p17459141/80111237/80111237_0014e.dat     4904188    7866536-7882920
p179/p17973277/83801243/83801243_0016e.dat     25970274   33443196-33451388
p179/p17973277/83801243/83801243_0010r.dat     267184     126505-134697
p193/p19305085/87468061/87468061_0019e.dat     22393823   22401189-22409381
p193/p19313794/88537698/88537698_0016e.dat     8141191    11785911-11794103

It'd be good to figure out why these examples are broken, and find a minimal example that we can use as a test case (and also share with the upstream flac and soundfile developers.)

Reproduce los fallos usando los archivos y números de muestra indicados de mimic4wdb/0.1.0, comparando libFLAC 1.3.3–1.4.3 y los commits referenciados cbb039d2d629885a943a620f9828fdccec9cf28c y 46bf04d0d74440a12be9508af508b4d373d696cf. La tarea estará terminada cuando se haya identificado por qué fallan los ejemplos y se haya reducido uno de ellos a un caso de prueba mínimo de wfdb-python adecuado para compartirlo con los desarrolladores upstream de flac y soundfile.