# obspy.io.mseed.core._write_mseed

`_write_mseed`(stream, filename, encoding=None, reclen=None, byteorder=None, sequence_number=None, flush=True, verbose=0, **_kwargs)

  Write Mini-SEED file from a Stream object.

  Warning

  This function should NOT be called directly, it registers via the the `write()` method of an ObsPy `Stream` object, call this instead.

  Parameters: | stream (`Stream`) A Stream object. filename (str) Name of the output file or a file-like object. encoding (int or str, optional) Should be set to one of the following supported Mini-SEED data encoding formats: `ASCII` (`0`)*, `INT16` (`1`), `INT32` (`3`), `FLOAT32` (`4`)*, `FLOAT64` (`5`)*, `STEIM1` (`10`) and `STEIM2` (`11`)*. If no encoding is given it will be derived from the dtype of the data and the appropriate default encoding (depicted with an asterix) will be chosen. reclen (int, optional) Should be set to the desired data record length in bytes which must be expressible as 2 raised to the power of X where X is between (and including) 8 to 20. Defaults to 4096 byteorder (int or str, optional) Must be either `0` or `'<'` for LSBF or little-endian, `1` or `'>'` for MBF or big-endian. `'='` is the native byte order. If `-1` it will be passed directly to libmseed which will also default it to big endian. Defaults to big endian. sequence_number (int, optional) Must be an integer ranging between 1 and 999999. Represents the sequence count of the first record of each Trace. Defaults to 1. flush (bool, optional) If `True`, all data will be packed into records. If `False` new records will only be created when there is enough data to completely fill a record. Be careful with this. If in doubt, choose `True` which is also the default value. verbose (int, optional) Controls verbosity, a value of `0` will result in no diagnostic output.

  Note

  The `reclen`, `encoding`, `byteorder` and `sequence_count` keyword arguments can be set in the `stats.mseed` of each `Trace` as well as `kwargs` of this function. If both are given the `kwargs` will be used.

  The `stats.mseed.blkt1001.timing_quality` value will also be written if it is set.

  The `stats.mseed.blkt1001.timing_quality` value will also be written if it is set.

  Example

      >>> from obspy import read
      >>> st = read()
      >>> st.write('filename.mseed', format='MSEED')

### Thank you!

We would like to thank our contributors, whose efforts make this software what it is. These people have helped by writing code and documentation, and by testing. They have created and maintained this product, its associated libraries and applications, our build tools and our web sites.

#### Contributors

- Ackerley, Nick
- Allgeyer, Sebastien
- Ammon, Charles J.
- Antunes, Emanuel
- Arnarsson, Ólafur St.
- Bank, Markus
- Barsch, Robert
- Behr, Yannik
- Bernardi, Fabrizio
- Bernauer, Felix
- Bes de Berc, Maxime
- Beyreuther, Moritz
- Boltz, Shawn
- Bonaimé, Sébastien
- Carothers, Lloyd
- Chamberlain, Calum
- Chambers, Derrick
- Chen, Zhao
- Clark, Adam
- Danecek, Peter
- Egdorf, Sven
- Engels, Fabian
- Ermert, Laura
- Eulenfeld, Tom

- Fabbri, Tommaso
- Falco, Nicholas
- Fee, Jeremy
- Grellier, Clément
- Grunberg, Marc
- Hammer, Conny
- Heimann, Sebastian
- Heiniger, Lukas
- Hope, Gaute
- Igel, Heiner
- Inza, Adolfo
- Isken, Marius
- Ketchum, David
- Koymans, Mathijs
- Kremers, Simon
- Kress, Victor
- Krieger, Lars
- Krischer, Lion
- Kula, Damian
- Käufl, Paul
- Köhler, Andreas
- Lecocq, Thomas
- Leeman, John
- Legovini, Paride

- Lesage, Philippe
- Li, Yulin
- Lomax, Anthony
- Lopes, Rui L.
- MacCarthy, Jonathan
- Maggi, Alessia
- Martin, Henri
- Medlin, Andrew
- Megies, Tobias
- Meschede, Matthias
- Michelini, Alberto
- Miller, Nathaniel C.
- Morgenstern, Bernhard
- Nof, Ran Novitsky
- Panning, Mark P.
- Parker, Tom
- Pestourie, Romain
- Rapagnani, Giovanni
- Reyes, Celso
- Ringler, Adam
- Rothenhäusler, Nicolas
- Russo, Emiliano
- Sales de Andrade, Elliott

- Satriano, Claudio
- Saul, Joachim
- Scheingraber, Chris
- Schneider, Simon
- Sippl, Christian
- Snoke, Arthur
- Stange, Stefan
- Stähler, Simon C.
- Sullivan, Benjamin
- Tian, Dongdong
- Trabant, Chad
- Trani, Luca
- Uieda, Leonardo
- Walker, Andrew
- Walther, Marcus
- Wassermann, Joachim
- Williams, Mark C.
- Winkelman, Andrew
- Zaccarelli, Riccardo
- Zad, Seyed Kasra Hosseini
- Zhu, Lijun
- van Driel, Martin
- van Wijk, Kasper

#### Funds

ObsPy was partially funded by the

- German Science Foundation (DFG) via grant DFG IG 16/9-1
- German Ministry for Education and Research (BMBF), GEOTECHNOLOGIEN grant 03G0646H.
- NERA project (Network of European Research Infrastructures for Earthquake Risk Assessment and Mitigation) under the European Community's Seventh Framework Programme (FP7/2007-2013) grant agreement n° 262330
- Leibniz Institute for Applied Geophysics (LIAG)
- VERCE EU-FP7 project (no. 283543)