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updated readme, added orderby
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nficano committed Oct 9, 2017
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134 changes: 131 additions & 3 deletions README.rst
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Expand Up @@ -38,12 +38,140 @@ Download using pip via pypi.
pip install pytube
Easy as Pie 💥
==============
Getting started
===============

Behold, the power of pytube:
Let's begin with showing how easy it is to download a video with pytube:

.. code-block:: python
>>> from pytube import YouTube
>>> YouTube('http://youtube.com/watch?v=9bZkp7q19f0').streams.first().download()
This example will download the highest quality progressive download stream available.

Next, let's explore how we would view what video streams are available:

.. code-block:: python
>>> yt = YouTube('http://youtube.com/watch?v=9bZkp7q19f0')
>>> yt.streams.all()
[<Stream: itag="22" mime_type="video/mp4" res="720p" fps="30fps" vcodec="avc1.64001F" acodec="mp4a.40.2">,
<Stream: itag="43" mime_type="video/webm" res="360p" fps="30fps" vcodec="vp8.0" acodec="vorbis">,
<Stream: itag="18" mime_type="video/mp4" res="360p" fps="30fps" vcodec="avc1.42001E" acodec="mp4a.40.2">,
<Stream: itag="36" mime_type="video/3gpp" res="240p" fps="30fps" vcodec="mp4v.20.3" acodec="mp4a.40.2">,
<Stream: itag="17" mime_type="video/3gpp" res="144p" fps="30fps" vcodec="mp4v.20.3" acodec="mp4a.40.2">,
<Stream: itag="137" mime_type="video/mp4" res="1080p" fps="30fps" vcodec="avc1.640028">,
<Stream: itag="248" mime_type="video/webm" res="1080p" fps="30fps" vcodec="vp9">,
<Stream: itag="136" mime_type="video/mp4" res="720p" fps="30fps" vcodec="avc1.4d401f">,
<Stream: itag="247" mime_type="video/webm" res="720p" fps="30fps" vcodec="vp9">,
<Stream: itag="135" mime_type="video/mp4" res="480p" fps="30fps" vcodec="avc1.4d401e">,
<Stream: itag="244" mime_type="video/webm" res="480p" fps="30fps" vcodec="vp9">,
<Stream: itag="134" mime_type="video/mp4" res="360p" fps="30fps" vcodec="avc1.4d401e">,
<Stream: itag="243" mime_type="video/webm" res="360p" fps="30fps" vcodec="vp9">,
<Stream: itag="133" mime_type="video/mp4" res="240p" fps="30fps" vcodec="avc1.4d4015">,
<Stream: itag="242" mime_type="video/webm" res="240p" fps="30fps" vcodec="vp9">,
<Stream: itag="160" mime_type="video/mp4" res="144p" fps="30fps" vcodec="avc1.4d400c">,
<Stream: itag="278" mime_type="video/webm" res="144p" fps="30fps" vcodec="vp9">,
<Stream: itag="140" mime_type="audio/mp4" abr="128kbps" acodec="mp4a.40.2">,
<Stream: itag="171" mime_type="audio/webm" abr="128kbps" acodec="vorbis">,
<Stream: itag="249" mime_type="audio/webm" abr="50kbps" acodec="opus">,
<Stream: itag="250" mime_type="audio/webm" abr="70kbps" acodec="opus">,
<Stream: itag="251" mime_type="audio/webm" abr="160kbps" acodec="opus">]
You may notice that some streams listed have both a video codec and audio codec, while others have just video or just audio, this is a result of YouTube supporting a streaming technique called Dynamic Adaptive Streaming over HTTP (DASH).

In the context of pytube, the implications are for the highest quality streams; you now need to download both the audio and video tracks and then post-process them with software like FFmpeg to merge them.

The legacy streams that contain the audio and video in a single file (referred to as "progressive download") are still available, but only for resolutions 720p and below.

To only view these progressive download streams:

.. code:: bash
>>> yt.streams.filter(progressive=True).all()
[<Stream: itag="22" mime_type="video/mp4" res="720p" fps="30fps" vcodec="avc1.64001F" acodec="mp4a.40.2">,
<Stream: itag="43" mime_type="video/webm" res="360p" fps="30fps" vcodec="vp8.0" acodec="vorbis">,
<Stream: itag="18" mime_type="video/mp4" res="360p" fps="30fps" vcodec="avc1.42001E" acodec="mp4a.40.2">,
<Stream: itag="36" mime_type="video/3gpp" res="240p" fps="30fps" vcodec="mp4v.20.3" acodec="mp4a.40.2">,
<Stream: itag="17" mime_type="video/3gpp" res="144p" fps="30fps" vcodec="mp4v.20.3" acodec="mp4a.40.2">]
Conversely, if you only want to see the DASH streams (also referred to as "adaptive") you can do:

.. code:: bash
>>> yt.streams.filter(adaptive=True).all()
[<Stream: itag="137" mime_type="video/mp4" res="1080p" fps="30fps" vcodec="avc1.640028">,
<Stream: itag="248" mime_type="video/webm" res="1080p" fps="30fps" vcodec="vp9">,
<Stream: itag="136" mime_type="video/mp4" res="720p" fps="30fps" vcodec="avc1.4d401f">,
<Stream: itag="247" mime_type="video/webm" res="720p" fps="30fps" vcodec="vp9">,
<Stream: itag="135" mime_type="video/mp4" res="480p" fps="30fps" vcodec="avc1.4d401e">,
<Stream: itag="244" mime_type="video/webm" res="480p" fps="30fps" vcodec="vp9">,
<Stream: itag="134" mime_type="video/mp4" res="360p" fps="30fps" vcodec="avc1.4d401e">,
<Stream: itag="243" mime_type="video/webm" res="360p" fps="30fps" vcodec="vp9">,
<Stream: itag="133" mime_type="video/mp4" res="240p" fps="30fps" vcodec="avc1.4d4015">,
<Stream: itag="242" mime_type="video/webm" res="240p" fps="30fps" vcodec="vp9">,
<Stream: itag="160" mime_type="video/mp4" res="144p" fps="30fps" vcodec="avc1.4d400c">,
<Stream: itag="278" mime_type="video/webm" res="144p" fps="30fps" vcodec="vp9">,
<Stream: itag="140" mime_type="audio/mp4" abr="128kbps" acodec="mp4a.40.2">,
<Stream: itag="171" mime_type="audio/webm" abr="128kbps" acodec="vorbis">,
<Stream: itag="249" mime_type="audio/webm" abr="50kbps" acodec="opus">,
<Stream: itag="250" mime_type="audio/webm" abr="70kbps" acodec="opus">,
<Stream: itag="251" mime_type="audio/webm" abr="160kbps" acodec="opus">]
Pytube allows you to filter on every property available (see the documentation for the complete list), let's take a look at some of the most useful ones.

To list the audio only streams:

.. code:: bash
>>> yt.streams.filter(only_audio=True).all()
[<Stream: itag="140" mime_type="audio/mp4" abr="128kbps" acodec="mp4a.40.2">,
<Stream: itag="171" mime_type="audio/webm" abr="128kbps" acodec="vorbis">,
<Stream: itag="249" mime_type="audio/webm" abr="50kbps" acodec="opus">,
<Stream: itag="250" mime_type="audio/webm" abr="70kbps" acodec="opus">,
<Stream: itag="251" mime_type="audio/webm" abr="160kbps" acodec="opus">]
To list only ``mp4`` streams:

.. code:: bash
>>> yt.streams.filter(subtype='mp4').all()
[<Stream: itag="22" mime_type="video/mp4" res="720p" fps="30fps" vcodec="avc1.64001F" acodec="mp4a.40.2">,
<Stream: itag="18" mime_type="video/mp4" res="360p" fps="30fps" vcodec="avc1.42001E" acodec="mp4a.40.2">,
<Stream: itag="137" mime_type="video/mp4" res="1080p" fps="30fps" vcodec="avc1.640028">,
<Stream: itag="136" mime_type="video/mp4" res="720p" fps="30fps" vcodec="avc1.4d401f">,
<Stream: itag="135" mime_type="video/mp4" res="480p" fps="30fps" vcodec="avc1.4d401e">,
<Stream: itag="134" mime_type="video/mp4" res="360p" fps="30fps" vcodec="avc1.4d401e">,
<Stream: itag="133" mime_type="video/mp4" res="240p" fps="30fps" vcodec="avc1.4d4015">,
<Stream: itag="160" mime_type="video/mp4" res="144p" fps="30fps" vcodec="avc1.4d400c">,
<Stream: itag="140" mime_type="audio/mp4" abr="128kbps" acodec="mp4a.40.2">]
Multiple filters can also be specified:

.. code:: bash
>>> yt.streams.filter(subtype='mp4', progressive=True).all()
>>> # this can also be expressed as:
>>> yt.streams.filter(subtype='mp4').filter(progressive=True).all()
[<Stream: itag="22" mime_type="video/mp4" res="720p" fps="30fps" vcodec="avc1.64001F" acodec="mp4a.40.2">,
<Stream: itag="18" mime_type="video/mp4" res="360p" fps="30fps" vcodec="avc1.42001E" acodec="mp4a.40.2">]
You also have an interface to select streams by their itag, without needing to filter:

.. code:: bash
>>> yt.streams.get_by_itag(22)
<Stream: itag="22" mime_type="video/mp4" res="720p" fps="30fps" vcodec="avc1.64001F" acodec="mp4a.40.2">
If you need to optimize for a specific feature, such as the "highest resolution" or "lowest average bitrate":

.. code:: bash
>>> yt.streams.filter(progressive=True).order_by('resolution').desc().all()
Note that ``order_by`` cannot be used if your attribute is undefined in any of the Stream instances, so be sure to apply a filter to remove those before calling it.
15 changes: 14 additions & 1 deletion pytube/query.py
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Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,7 @@ def filter(
filters.append(lambda s: s.is_progressive)

if adaptive:
filters.append(lambda s: s.is_progressive)
filters.append(lambda s: s.is_adaptive)

if custom_filter_functions:
for fn in custom_filter_functions:
Expand All @@ -114,6 +114,19 @@ def filter(
fmt_streams = list(filter(fn, fmt_streams))
return StreamQuery(fmt_streams)

def order_by(self, attribute_name):
fmt_streams = sorted(
self.fmt_streams,
key=lambda s: getattr(s, attribute_name),
)
return StreamQuery(fmt_streams)

def desc(self):
return StreamQuery(self.fmt_streams[::-1])

def asc(self):
return self

def get_by_itag(self, itag):
"""Get a :class:`Stream <Stream>` for an itag, or None if not found.
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