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Issue 507 timedelta #508

Merged
merged 4 commits into from
Oct 18, 2019
Merged

Issue 507 timedelta #508

merged 4 commits into from
Oct 18, 2019

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nigelmegitt
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Fixes #507 by interpreting decimal fractions of seconds as milliseconds, up to 3 decimal places, and adding tests to verify this behaviour.

Fixes #507 by interpreting decimal fractions of seconds as milliseconds, up to 3 decimal places, and adding tests to verify this behaviour.
@coveralls
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coveralls commented Oct 18, 2019

Coverage Status

Coverage decreased (-0.006%) to 85.199% when pulling 05e5156 on issue-507-timedelta into fa4b6ac on release/2.1.2.

* Remove `_int_or_none` which doesn't seem to be needed
* revert 3 decimal places constraint: precision is no longer limited.
* Add tests for 4 digit decimal fractions.
@spoeschel
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Thank you for applying all the changes!

@nigelmegitt nigelmegitt merged commit 514ed2a into release/2.1.2 Oct 18, 2019
@nigelmegitt nigelmegitt deleted the issue-507-timedelta branch October 18, 2019 11:24
@nigelmegitt nigelmegitt mentioned this pull request Nov 11, 2019
nigelmegitt added a commit to bbc/ebu-tt-live-toolkit that referenced this pull request Nov 14, 2019
Should remove a merge conflict.
nigelmegitt added a commit that referenced this pull request Dec 4, 2019
* Add service_identity module dependency

Removes a test warning, improves twisted's ability to verify certificates.

* Fix #474

Use relative links to templates.
Put message payload into the UIP display so that the receiver can read it without having to open the message XML up.

* Remove requirement for pytest-capturelog, removed from

No longer needed because it has been merged into the core.

* Refactor proxy handling for client

Track a change to proxy handling in Autobahn / twisted for #477. There's probably a more elegant way, but this works for now... Lacking a test, but have verified it locally.

* More elegant fix for proxy

We don't need the HTTPProxyConfig object at all anymore, just a `dict` will do.

* Don't call fixtures directly

Closes #490.

Calling fixtures directly is deprecated, this solution described at
https://docs.pytest.org/en/latest/deprecations.html#calling-fixtures-directly
seems to work, creating a named fixture rather than defining the "then"
step as a fixture directly.

* Restrict autobahn to versions before 18

Temporarily fixes #496, prior to addressing the problem properly anyway.

* Restrict autobahn to versions before 18

Temporarily fixes #496, prior to addressing the problem properly anyway.

* Issue 447 resequencer documentation (#515)

* Fix indentation warning

* Fix underline length warning

* Fix document generation warning

* Add Resequencer Node documentation

Closes #447 .

* Address review comment

Merging now because this affects documentation only, and this allows progress to continue on other pull requests.

* Handle timing types in elements without crashing (#516)

* Fix #492

* Define the type of `ebuttm:documentStartOfProgramme` correctly.
* When processing a timing type outside of the context of an attribute, bypass the timebase validation.

This is possibly a temporary hack, since element timing validation might be needed one day, but since we don't do anything with metadata elements, this isn't a disaster (yet).

* Add tests

Checks that including a valid time in a `ebuttm:documentStartOfProgramme` element does not cause a processing or validation error.

* Issue 507 timedelta (#508)

* Correctly interpret decimal fractions of seconds

Fixes #507 by interpreting decimal fractions of seconds as milliseconds and adding tests to verify this behaviour for 3 and 4 decimal places.

Removes `_int_or_none` which doesn't seem to be needed

* Specify incompatible attributes (#518)

Fixes #514.

* Resequencer: allow to immediately issue documents (#510)

So far the resequencer starts to regularly issue documents only after
the first EBU-TT Live document has been received. However for some use
cases this might be inconvenient as an active document must exist at all
times e.g. when creating segments for an MPEG-DASH stream. The reason
for documents being issued only after the first received EBU-TT Live
document is that certain parameters of that document are used for
initialisation.

This commit adds a new configuration parameter that specifies a document
which will be used for initialisation (instead of the first received
EBU-TT Live document). Therefore the resequencer will immediately (be
able to) start issuing documents after its creation.

Closes #505.

* Resequencer: fix sequence number 1 if no content (#509)

While the EBUTT3Splicer is provided with the current sequence number
stored/incremented by the Resequencer, the `create_compatible_document`
method so far refers to the sequence number stored internally by
EBUTT3DocumentSequence instead. This leads to a sequence number of 1 in
the issued output document if no subtitle content is available.

To align with the correct (strictly monotonic increasing) sequence
number, always use the one stored by the Resequencer.

Fixes #502.

* Up version to 2.1.2
nigelmegitt added a commit to bbc/ebu-tt-live-toolkit that referenced this pull request Nov 23, 2021
* Add service_identity module dependency

Removes a test warning, improves twisted's ability to verify certificates.

* Fix ebu#474

Use relative links to templates.
Put message payload into the UIP display so that the receiver can read it without having to open the message XML up.

* Remove requirement for pytest-capturelog, removed from

No longer needed because it has been merged into the core.

* Refactor proxy handling for client

Track a change to proxy handling in Autobahn / twisted for ebu#477. There's probably a more elegant way, but this works for now... Lacking a test, but have verified it locally.

* More elegant fix for proxy

We don't need the HTTPProxyConfig object at all anymore, just a `dict` will do.

* Don't call fixtures directly

Closes ebu#490.

Calling fixtures directly is deprecated, this solution described at
https://docs.pytest.org/en/latest/deprecations.html#calling-fixtures-directly
seems to work, creating a named fixture rather than defining the "then"
step as a fixture directly.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Issue 447 resequencer documentation (ebu#515)

* Fix indentation warning

* Fix underline length warning

* Fix document generation warning

* Add Resequencer Node documentation

Closes ebu#447 .

* Address review comment

Merging now because this affects documentation only, and this allows progress to continue on other pull requests.

* Handle timing types in elements without crashing (ebu#516)

* Fix ebu#492

* Define the type of `ebuttm:documentStartOfProgramme` correctly.
* When processing a timing type outside of the context of an attribute, bypass the timebase validation.

This is possibly a temporary hack, since element timing validation might be needed one day, but since we don't do anything with metadata elements, this isn't a disaster (yet).

* Add tests

Checks that including a valid time in a `ebuttm:documentStartOfProgramme` element does not cause a processing or validation error.

* Issue 507 timedelta (ebu#508)

* Correctly interpret decimal fractions of seconds

Fixes ebu#507 by interpreting decimal fractions of seconds as milliseconds and adding tests to verify this behaviour for 3 and 4 decimal places.

Removes `_int_or_none` which doesn't seem to be needed

* Specify incompatible attributes (ebu#518)

Fixes ebu#514.

* Resequencer: allow to immediately issue documents (ebu#510)

So far the resequencer starts to regularly issue documents only after
the first EBU-TT Live document has been received. However for some use
cases this might be inconvenient as an active document must exist at all
times e.g. when creating segments for an MPEG-DASH stream. The reason
for documents being issued only after the first received EBU-TT Live
document is that certain parameters of that document are used for
initialisation.

This commit adds a new configuration parameter that specifies a document
which will be used for initialisation (instead of the first received
EBU-TT Live document). Therefore the resequencer will immediately (be
able to) start issuing documents after its creation.

Closes ebu#505.

* Resequencer: fix sequence number 1 if no content (ebu#509)

While the EBUTT3Splicer is provided with the current sequence number
stored/incremented by the Resequencer, the `create_compatible_document`
method so far refers to the sequence number stored internally by
EBUTT3DocumentSequence instead. This leads to a sequence number of 1 in
the issued output document if no subtitle content is available.

To align with the correct (strictly monotonic increasing) sequence
number, always use the one stored by the Resequencer.

Fixes ebu#502.

* Up version to 2.1.2
nigelmegitt added a commit to bbc/ebu-tt-live-toolkit that referenced this pull request Dec 7, 2021
Pulls in upstream fixes from Release/2.1.2 (ebu#522) and fixes an issue where, on conversion to EBU-TT-D, `<br>` children of `<p>` elements that have child `<span>` elements with differing timing also get wrapped in appropriately timed `<span>`s and therefore are not active always. Fixes a presentation error for some content.

### New stuff

* Add and pass tests

Drive-by discovery and fix of a bug in `denester.py` that did not handle `span` elements with an indefinite computed end time correctly.

In `ebuttd_nested_elements.feature`, the new code bumps the span that gets style S2S6 along one, because the `br` element before it now gets wrapped in a span.

Add a BDD for timings present on both p and consecutive span elements with an intervening br element.

* Remove Pipfile and don't need pytest-catchlog

* Up version to 3.0.1

* Remove restriction on hyperlink

Appears that python-hyper/hyperlink#16 has been resolved.


### Notes from pulled in changes:

* Add service_identity module dependency

Removes a test warning, improves twisted's ability to verify certificates.

* Fix ebu#474

Use relative links to templates.
Put message payload into the UIP display so that the receiver can read it without having to open the message XML up.

* Remove requirement for pytest-capturelog, removed from

No longer needed because it has been merged into the core.

* Refactor proxy handling for client

Track a change to proxy handling in Autobahn / twisted for ebu#477. There's probably a more elegant way, but this works for now... Lacking a test, but have verified it locally.

* More elegant fix for proxy

We don't need the HTTPProxyConfig object at all anymore, just a `dict` will do.

* Don't call fixtures directly (ebu#490).

Calling fixtures directly is deprecated, this solution described at
https://docs.pytest.org/en/latest/deprecations.html#calling-fixtures-directly
seems to work, creating a named fixture rather than defining the "then"
step as a fixture directly.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* ebu#447 resequencer documentation (ebu#515)

* Fix indentation warning

* Fix underline length warning

* Fix document generation warning

* Add Resequencer Node documentation

Closes ebu#447 .

* Address review comment

Merging now because this affects documentation only, and this allows progress to continue on other pull requests.

* Handle timing types in elements without crashing (ebu#516)

* Fix ebu#492

* Define the type of `ebuttm:documentStartOfProgramme` correctly.
* When processing a timing type outside of the context of an attribute, bypass the timebase validation.

This is possibly a temporary hack, since element timing validation might be needed one day, but since we don't do anything with metadata elements, this isn't a disaster (yet).

* Add tests

Checks that including a valid time in a `ebuttm:documentStartOfProgramme` element does not cause a processing or validation error.

* ebu#507 timedelta (ebu#508)

* Correctly interpret decimal fractions of seconds

Fixes ebu#507 by interpreting decimal fractions of seconds as milliseconds and adding tests to verify this behaviour for 3 and 4 decimal places.

Removes `_int_or_none` which doesn't seem to be needed

* Specify incompatible attributes (ebu#518)

Fixes ebu#514.

* Resequencer: allow to immediately issue documents (ebu#510)

So far the resequencer starts to regularly issue documents only after
the first EBU-TT Live document has been received. However for some use
cases this might be inconvenient as an active document must exist at all
times e.g. when creating segments for an MPEG-DASH stream. The reason
for documents being issued only after the first received EBU-TT Live
document is that certain parameters of that document are used for
initialisation.

This commit adds a new configuration parameter that specifies a document
which will be used for initialisation (instead of the first received
EBU-TT Live document). Therefore the resequencer will immediately (be
able to) start issuing documents after its creation.

Closes ebu#505.

* Resequencer: fix sequence number 1 if no content (ebu#509)

While the EBUTT3Splicer is provided with the current sequence number
stored/incremented by the Resequencer, the `create_compatible_document`
method so far refers to the sequence number stored internally by
EBUTT3DocumentSequence instead. This leads to a sequence number of 1 in
the issued output document if no subtitle content is available.

To align with the correct (strictly monotonic increasing) sequence
number, always use the one stored by the Resequencer.

Fixes ebu#502.
nigelmegitt added a commit to bbc/ebu-tt-live-toolkit that referenced this pull request Dec 7, 2023
* Add service_identity module dependency

Removes a test warning, improves twisted's ability to verify certificates.

* Fix ebu#474

Use relative links to templates.
Put message payload into the UIP display so that the receiver can read it without having to open the message XML up.

* Remove requirement for pytest-capturelog, removed from

No longer needed because it has been merged into the core.

* Refactor proxy handling for client

Track a change to proxy handling in Autobahn / twisted for ebu#477. There's probably a more elegant way, but this works for now... Lacking a test, but have verified it locally.

* More elegant fix for proxy

We don't need the HTTPProxyConfig object at all anymore, just a `dict` will do.

* Don't call fixtures directly

Closes ebu#490.

Calling fixtures directly is deprecated, this solution described at
https://docs.pytest.org/en/latest/deprecations.html#calling-fixtures-directly
seems to work, creating a named fixture rather than defining the "then"
step as a fixture directly.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Issue 447 resequencer documentation (ebu#515)

* Fix indentation warning

* Fix underline length warning

* Fix document generation warning

* Add Resequencer Node documentation

Closes ebu#447 .

* Address review comment

Merging now because this affects documentation only, and this allows progress to continue on other pull requests.

* Handle timing types in elements without crashing (ebu#516)

* Fix ebu#492

* Define the type of `ebuttm:documentStartOfProgramme` correctly.
* When processing a timing type outside of the context of an attribute, bypass the timebase validation.

This is possibly a temporary hack, since element timing validation might be needed one day, but since we don't do anything with metadata elements, this isn't a disaster (yet).

* Add tests

Checks that including a valid time in a `ebuttm:documentStartOfProgramme` element does not cause a processing or validation error.

* Issue 507 timedelta (ebu#508)

* Correctly interpret decimal fractions of seconds

Fixes ebu#507 by interpreting decimal fractions of seconds as milliseconds and adding tests to verify this behaviour for 3 and 4 decimal places.

Removes `_int_or_none` which doesn't seem to be needed

* Specify incompatible attributes (ebu#518)

Fixes ebu#514.

* Resequencer: allow to immediately issue documents (ebu#510)

So far the resequencer starts to regularly issue documents only after
the first EBU-TT Live document has been received. However for some use
cases this might be inconvenient as an active document must exist at all
times e.g. when creating segments for an MPEG-DASH stream. The reason
for documents being issued only after the first received EBU-TT Live
document is that certain parameters of that document are used for
initialisation.

This commit adds a new configuration parameter that specifies a document
which will be used for initialisation (instead of the first received
EBU-TT Live document). Therefore the resequencer will immediately (be
able to) start issuing documents after its creation.

Closes ebu#505.

* Resequencer: fix sequence number 1 if no content (ebu#509)

While the EBUTT3Splicer is provided with the current sequence number
stored/incremented by the Resequencer, the `create_compatible_document`
method so far refers to the sequence number stored internally by
EBUTT3DocumentSequence instead. This leads to a sequence number of 1 in
the issued output document if no subtitle content is available.

To align with the correct (strictly monotonic increasing) sequence
number, always use the one stored by the Resequencer.

Fixes ebu#502.

* Up version to 2.1.2
nigelmegitt added a commit to bbc/ebu-tt-live-toolkit that referenced this pull request Dec 25, 2023
* Add service_identity module dependency

Removes a test warning, improves twisted's ability to verify certificates.

* Fix ebu#474

Use relative links to templates.
Put message payload into the UIP display so that the receiver can read it without having to open the message XML up.

* Remove requirement for pytest-capturelog, removed from

No longer needed because it has been merged into the core.

* Refactor proxy handling for client

Track a change to proxy handling in Autobahn / twisted for ebu#477. There's probably a more elegant way, but this works for now... Lacking a test, but have verified it locally.

* More elegant fix for proxy

We don't need the HTTPProxyConfig object at all anymore, just a `dict` will do.

* Don't call fixtures directly

Closes ebu#490.

Calling fixtures directly is deprecated, this solution described at
https://docs.pytest.org/en/latest/deprecations.html#calling-fixtures-directly
seems to work, creating a named fixture rather than defining the "then"
step as a fixture directly.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Issue 447 resequencer documentation (ebu#515)

* Fix indentation warning

* Fix underline length warning

* Fix document generation warning

* Add Resequencer Node documentation

Closes ebu#447 .

* Address review comment

Merging now because this affects documentation only, and this allows progress to continue on other pull requests.

* Handle timing types in elements without crashing (ebu#516)

* Fix ebu#492

* Define the type of `ebuttm:documentStartOfProgramme` correctly.
* When processing a timing type outside of the context of an attribute, bypass the timebase validation.

This is possibly a temporary hack, since element timing validation might be needed one day, but since we don't do anything with metadata elements, this isn't a disaster (yet).

* Add tests

Checks that including a valid time in a `ebuttm:documentStartOfProgramme` element does not cause a processing or validation error.

* Issue 507 timedelta (ebu#508)

* Correctly interpret decimal fractions of seconds

Fixes ebu#507 by interpreting decimal fractions of seconds as milliseconds and adding tests to verify this behaviour for 3 and 4 decimal places.

Removes `_int_or_none` which doesn't seem to be needed

* Specify incompatible attributes (ebu#518)

Fixes ebu#514.

* Resequencer: allow to immediately issue documents (ebu#510)

So far the resequencer starts to regularly issue documents only after
the first EBU-TT Live document has been received. However for some use
cases this might be inconvenient as an active document must exist at all
times e.g. when creating segments for an MPEG-DASH stream. The reason
for documents being issued only after the first received EBU-TT Live
document is that certain parameters of that document are used for
initialisation.

This commit adds a new configuration parameter that specifies a document
which will be used for initialisation (instead of the first received
EBU-TT Live document). Therefore the resequencer will immediately (be
able to) start issuing documents after its creation.

Closes ebu#505.

* Resequencer: fix sequence number 1 if no content (ebu#509)

While the EBUTT3Splicer is provided with the current sequence number
stored/incremented by the Resequencer, the `create_compatible_document`
method so far refers to the sequence number stored internally by
EBUTT3DocumentSequence instead. This leads to a sequence number of 1 in
the issued output document if no subtitle content is available.

To align with the correct (strictly monotonic increasing) sequence
number, always use the one stored by the Resequencer.

Fixes ebu#502.

* Up version to 2.1.2
nigelmegitt added a commit to bbc/ebu-tt-live-toolkit that referenced this pull request Dec 25, 2023
* Add service_identity module dependency

Removes a test warning, improves twisted's ability to verify certificates.

* Fix ebu#474

Use relative links to templates.
Put message payload into the UIP display so that the receiver can read it without having to open the message XML up.

* Remove requirement for pytest-capturelog, removed from

No longer needed because it has been merged into the core.

* Refactor proxy handling for client

Track a change to proxy handling in Autobahn / twisted for ebu#477. There's probably a more elegant way, but this works for now... Lacking a test, but have verified it locally.

* More elegant fix for proxy

We don't need the HTTPProxyConfig object at all anymore, just a `dict` will do.

* Don't call fixtures directly

Closes ebu#490.

Calling fixtures directly is deprecated, this solution described at
https://docs.pytest.org/en/latest/deprecations.html#calling-fixtures-directly
seems to work, creating a named fixture rather than defining the "then"
step as a fixture directly.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Issue 447 resequencer documentation (ebu#515)

* Fix indentation warning

* Fix underline length warning

* Fix document generation warning

* Add Resequencer Node documentation

Closes ebu#447 .

* Address review comment

Merging now because this affects documentation only, and this allows progress to continue on other pull requests.

* Handle timing types in elements without crashing (ebu#516)

* Fix ebu#492

* Define the type of `ebuttm:documentStartOfProgramme` correctly.
* When processing a timing type outside of the context of an attribute, bypass the timebase validation.

This is possibly a temporary hack, since element timing validation might be needed one day, but since we don't do anything with metadata elements, this isn't a disaster (yet).

* Add tests

Checks that including a valid time in a `ebuttm:documentStartOfProgramme` element does not cause a processing or validation error.

* Issue 507 timedelta (ebu#508)

* Correctly interpret decimal fractions of seconds

Fixes ebu#507 by interpreting decimal fractions of seconds as milliseconds and adding tests to verify this behaviour for 3 and 4 decimal places.

Removes `_int_or_none` which doesn't seem to be needed

* Specify incompatible attributes (ebu#518)

Fixes ebu#514.

* Resequencer: allow to immediately issue documents (ebu#510)

So far the resequencer starts to regularly issue documents only after
the first EBU-TT Live document has been received. However for some use
cases this might be inconvenient as an active document must exist at all
times e.g. when creating segments for an MPEG-DASH stream. The reason
for documents being issued only after the first received EBU-TT Live
document is that certain parameters of that document are used for
initialisation.

This commit adds a new configuration parameter that specifies a document
which will be used for initialisation (instead of the first received
EBU-TT Live document). Therefore the resequencer will immediately (be
able to) start issuing documents after its creation.

Closes ebu#505.

* Resequencer: fix sequence number 1 if no content (ebu#509)

While the EBUTT3Splicer is provided with the current sequence number
stored/incremented by the Resequencer, the `create_compatible_document`
method so far refers to the sequence number stored internally by
EBUTT3DocumentSequence instead. This leads to a sequence number of 1 in
the issued output document if no subtitle content is available.

To align with the correct (strictly monotonic increasing) sequence
number, always use the one stored by the Resequencer.

Fixes ebu#502.

* Up version to 2.1.2
nigelmegitt added a commit to bbc/ebu-tt-live-toolkit that referenced this pull request Dec 25, 2023
* Add service_identity module dependency

Removes a test warning, improves twisted's ability to verify certificates.

* Fix ebu#474

Use relative links to templates.
Put message payload into the UIP display so that the receiver can read it without having to open the message XML up.

* Remove requirement for pytest-capturelog, removed from

No longer needed because it has been merged into the core.

* Refactor proxy handling for client

Track a change to proxy handling in Autobahn / twisted for ebu#477. There's probably a more elegant way, but this works for now... Lacking a test, but have verified it locally.

* More elegant fix for proxy

We don't need the HTTPProxyConfig object at all anymore, just a `dict` will do.

* Don't call fixtures directly

Closes ebu#490.

Calling fixtures directly is deprecated, this solution described at
https://docs.pytest.org/en/latest/deprecations.html#calling-fixtures-directly
seems to work, creating a named fixture rather than defining the "then"
step as a fixture directly.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Restrict autobahn to versions before 18

Temporarily fixes ebu#496, prior to addressing the problem properly anyway.

* Issue 447 resequencer documentation (ebu#515)

* Fix indentation warning

* Fix underline length warning

* Fix document generation warning

* Add Resequencer Node documentation

Closes ebu#447 .

* Address review comment

Merging now because this affects documentation only, and this allows progress to continue on other pull requests.

* Handle timing types in elements without crashing (ebu#516)

* Fix ebu#492

* Define the type of `ebuttm:documentStartOfProgramme` correctly.
* When processing a timing type outside of the context of an attribute, bypass the timebase validation.

This is possibly a temporary hack, since element timing validation might be needed one day, but since we don't do anything with metadata elements, this isn't a disaster (yet).

* Add tests

Checks that including a valid time in a `ebuttm:documentStartOfProgramme` element does not cause a processing or validation error.

* Issue 507 timedelta (ebu#508)

* Correctly interpret decimal fractions of seconds

Fixes ebu#507 by interpreting decimal fractions of seconds as milliseconds and adding tests to verify this behaviour for 3 and 4 decimal places.

Removes `_int_or_none` which doesn't seem to be needed

* Specify incompatible attributes (ebu#518)

Fixes ebu#514.

* Resequencer: allow to immediately issue documents (ebu#510)

So far the resequencer starts to regularly issue documents only after
the first EBU-TT Live document has been received. However for some use
cases this might be inconvenient as an active document must exist at all
times e.g. when creating segments for an MPEG-DASH stream. The reason
for documents being issued only after the first received EBU-TT Live
document is that certain parameters of that document are used for
initialisation.

This commit adds a new configuration parameter that specifies a document
which will be used for initialisation (instead of the first received
EBU-TT Live document). Therefore the resequencer will immediately (be
able to) start issuing documents after its creation.

Closes ebu#505.

* Resequencer: fix sequence number 1 if no content (ebu#509)

While the EBUTT3Splicer is provided with the current sequence number
stored/incremented by the Resequencer, the `create_compatible_document`
method so far refers to the sequence number stored internally by
EBUTT3DocumentSequence instead. This leads to a sequence number of 1 in
the issued output document if no subtitle content is available.

To align with the correct (strictly monotonic increasing) sequence
number, always use the one stored by the Resequencer.

Fixes ebu#502.

* Up version to 2.1.2
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