youtube-dl/test/test_YoutubeDL.py

#!/usr/bin/env python

from __future__ import unicode_literals

# Allow direct execution
import os
import sys
import unittest
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

import copy

from test.helper import FakeYDL, assertRegexpMatches
from youtube_dl import YoutubeDL
from youtube_dl.compat import compat_str
from youtube_dl.extractor import YoutubeIE
from youtube_dl.postprocessor.common import PostProcessor
from youtube_dl.utils import ExtractorError, match_filter_func

TEST_URL = 'http://localhost/sample.mp4'


class YDL(FakeYDL):
    def __init__(self, *args, **kwargs):
        super(YDL, self).__init__(*args, **kwargs)
        self.downloaded_info_dicts = []
        self.msgs = []

    def process_info(self, info_dict):
        self.downloaded_info_dicts.append(info_dict)

    def to_screen(self, msg):
        self.msgs.append(msg)


def _make_result(formats, **kwargs):
    res = {
        'formats': formats,
        'id': 'testid',
        'title': 'testttitle',
        'extractor': 'testex',
    }
    res.update(**kwargs)
    return res


class TestFormatSelection(unittest.TestCase):
    def test_prefer_free_formats(self):
        # Same resolution => download webm
        ydl = YDL()
        ydl.params['prefer_free_formats'] = True
        formats = [
            {'ext': 'webm', 'height': 460, 'url': TEST_URL},
            {'ext': 'mp4', 'height': 460, 'url': TEST_URL},
        ]
        info_dict = _make_result(formats)
        yie = YoutubeIE(ydl)
        yie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['ext'], 'webm')

        # Different resolution => download best quality (mp4)
        ydl = YDL()
        ydl.params['prefer_free_formats'] = True
        formats = [
            {'ext': 'webm', 'height': 720, 'url': TEST_URL},
            {'ext': 'mp4', 'height': 1080, 'url': TEST_URL},
        ]
        info_dict['formats'] = formats
        yie = YoutubeIE(ydl)
        yie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['ext'], 'mp4')

        # No prefer_free_formats => prefer mp4 and flv for greater compatibility
        ydl = YDL()
        ydl.params['prefer_free_formats'] = False
        formats = [
            {'ext': 'webm', 'height': 720, 'url': TEST_URL},
            {'ext': 'mp4', 'height': 720, 'url': TEST_URL},
            {'ext': 'flv', 'height': 720, 'url': TEST_URL},
        ]
        info_dict['formats'] = formats
        yie = YoutubeIE(ydl)
        yie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['ext'], 'mp4')

        ydl = YDL()
        ydl.params['prefer_free_formats'] = False
        formats = [
            {'ext': 'flv', 'height': 720, 'url': TEST_URL},
            {'ext': 'webm', 'height': 720, 'url': TEST_URL},
        ]
        info_dict['formats'] = formats
        yie = YoutubeIE(ydl)
        yie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['ext'], 'flv')

    def test_format_selection(self):
        formats = [
            {'format_id': '35', 'ext': 'mp4', 'preference': 1, 'url': TEST_URL},
            {'format_id': 'example-with-dashes', 'ext': 'webm', 'preference': 1, 'url': TEST_URL},
            {'format_id': '45', 'ext': 'webm', 'preference': 2, 'url': TEST_URL},
            {'format_id': '47', 'ext': 'webm', 'preference': 3, 'url': TEST_URL},
            {'format_id': '2', 'ext': 'flv', 'preference': 4, 'url': TEST_URL},
        ]
        info_dict = _make_result(formats)

        ydl = YDL({'format': '20/47'})
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], '47')

        ydl = YDL({'format': '20/71/worst'})
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], '35')

        ydl = YDL()
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], '2')

        ydl = YDL({'format': 'webm/mp4'})
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], '47')

        ydl = YDL({'format': '3gp/40/mp4'})
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], '35')

        ydl = YDL({'format': 'example-with-dashes'})
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'example-with-dashes')

    def test_format_selection_audio(self):
        formats = [
            {'format_id': 'audio-low', 'ext': 'webm', 'preference': 1, 'vcodec': 'none', 'url': TEST_URL},
            {'format_id': 'audio-mid', 'ext': 'webm', 'preference': 2, 'vcodec': 'none', 'url': TEST_URL},
            {'format_id': 'audio-high', 'ext': 'flv', 'preference': 3, 'vcodec': 'none', 'url': TEST_URL},
            {'format_id': 'vid', 'ext': 'mp4', 'preference': 4, 'url': TEST_URL},
        ]
        info_dict = _make_result(formats)

        ydl = YDL({'format': 'bestaudio'})
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'audio-high')

        ydl = YDL({'format': 'worstaudio'})
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'audio-low')

        formats = [
            {'format_id': 'vid-low', 'ext': 'mp4', 'preference': 1, 'url': TEST_URL},
            {'format_id': 'vid-high', 'ext': 'mp4', 'preference': 2, 'url': TEST_URL},
        ]
        info_dict = _make_result(formats)

        ydl = YDL({'format': 'bestaudio/worstaudio/best'})
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'vid-high')

    def test_format_selection_audio_exts(self):
        formats = [
            {'format_id': 'mp3-64', 'ext': 'mp3', 'abr': 64, 'url': 'http://_', 'vcodec': 'none'},
            {'format_id': 'ogg-64', 'ext': 'ogg', 'abr': 64, 'url': 'http://_', 'vcodec': 'none'},
            {'format_id': 'aac-64', 'ext': 'aac', 'abr': 64, 'url': 'http://_', 'vcodec': 'none'},
            {'format_id': 'mp3-32', 'ext': 'mp3', 'abr': 32, 'url': 'http://_', 'vcodec': 'none'},
            {'format_id': 'aac-32', 'ext': 'aac', 'abr': 32, 'url': 'http://_', 'vcodec': 'none'},
        ]

        info_dict = _make_result(formats)
        ydl = YDL({'format': 'best'})
        ie = YoutubeIE(ydl)
        ie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(copy.deepcopy(info_dict))
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'aac-64')

        ydl = YDL({'format': 'mp3'})
        ie = YoutubeIE(ydl)
        ie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(copy.deepcopy(info_dict))
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'mp3-64')

        ydl = YDL({'prefer_free_formats': True})
        ie = YoutubeIE(ydl)
        ie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(copy.deepcopy(info_dict))
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'ogg-64')

    def test_format_selection_video(self):
        formats = [
            {'format_id': 'dash-video-low', 'ext': 'mp4', 'preference': 1, 'acodec': 'none', 'url': TEST_URL},
            {'format_id': 'dash-video-high', 'ext': 'mp4', 'preference': 2, 'acodec': 'none', 'url': TEST_URL},
            {'format_id': 'vid', 'ext': 'mp4', 'preference': 3, 'url': TEST_URL},
        ]
        info_dict = _make_result(formats)

        ydl = YDL({'format': 'bestvideo'})
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'dash-video-high')

        ydl = YDL({'format': 'worstvideo'})
        ydl.process_ie_result(info_dict.copy())
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'dash-video-low')

    def test_youtube_format_selection(self):
        order = [
            '38', '37', '46', '22', '45', '35', '44', '18', '34', '43', '6', '5', '36', '17', '13',
            # Apple HTTP Live Streaming
            '96', '95', '94', '93', '92', '132', '151',
            # 3D
            '85', '84', '102', '83', '101', '82', '100',
            # Dash video
            '137', '248', '136', '247', '135', '246',
            '245', '244', '134', '243', '133', '242', '160',
            # Dash audio
            '141', '172', '140', '171', '139',
        ]

        def format_info(f_id):
            info = YoutubeIE._formats[f_id].copy()
            info['format_id'] = f_id
            info['url'] = 'url:' + f_id
            return info
        formats_order = [format_info(f_id) for f_id in order]

        info_dict = _make_result(list(formats_order), extractor='youtube')
        ydl = YDL({'format': 'bestvideo+bestaudio'})
        yie = YoutubeIE(ydl)
        yie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], '137+141')
        self.assertEqual(downloaded['ext'], 'mp4')

        info_dict = _make_result(list(formats_order), extractor='youtube')
        ydl = YDL({'format': 'bestvideo[height>=999999]+bestaudio/best'})
        yie = YoutubeIE(ydl)
        yie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], '38')

        info_dict = _make_result(list(formats_order), extractor='youtube')
        ydl = YDL({'format': 'bestvideo/best,bestaudio'})
        yie = YoutubeIE(ydl)
        yie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(info_dict)
        downloaded_ids = [info['format_id'] for info in ydl.downloaded_info_dicts]
        self.assertEqual(downloaded_ids, ['137', '141'])

        info_dict = _make_result(list(formats_order), extractor='youtube')
        ydl = YDL({'format': '(bestvideo[ext=mp4],bestvideo[ext=webm])+bestaudio'})
        yie = YoutubeIE(ydl)
        yie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(info_dict)
        downloaded_ids = [info['format_id'] for info in ydl.downloaded_info_dicts]
        self.assertEqual(downloaded_ids, ['137+141', '248+141'])

        info_dict = _make_result(list(formats_order), extractor='youtube')
        ydl = YDL({'format': '(bestvideo[ext=mp4],bestvideo[ext=webm])[height<=720]+bestaudio'})
        yie = YoutubeIE(ydl)
        yie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(info_dict)
        downloaded_ids = [info['format_id'] for info in ydl.downloaded_info_dicts]
        self.assertEqual(downloaded_ids, ['136+141', '247+141'])

        info_dict = _make_result(list(formats_order), extractor='youtube')
        ydl = YDL({'format': '(bestvideo[ext=none]/bestvideo[ext=webm])+bestaudio'})
        yie = YoutubeIE(ydl)
        yie._sort_formats(info_dict['formats'])
        ydl.process_ie_result(info_dict)
        downloaded_ids = [info['format_id'] for info in ydl.downloaded_info_dicts]
        self.assertEqual(downloaded_ids, ['248+141'])

        for f1, f2 in zip(formats_order, formats_order[1:]):
            info_dict = _make_result([f1, f2], extractor='youtube')
            ydl = YDL({'format': 'best/bestvideo'})
            yie = YoutubeIE(ydl)
            yie._sort_formats(info_dict['formats'])
            ydl.process_ie_result(info_dict)
            downloaded = ydl.downloaded_info_dicts[0]
            self.assertEqual(downloaded['format_id'], f1['format_id'])

            info_dict = _make_result([f2, f1], extractor='youtube')
            ydl = YDL({'format': 'best/bestvideo'})
            yie = YoutubeIE(ydl)
            yie._sort_formats(info_dict['formats'])
            ydl.process_ie_result(info_dict)
            downloaded = ydl.downloaded_info_dicts[0]
            self.assertEqual(downloaded['format_id'], f1['format_id'])

    def test_invalid_format_specs(self):
        def assert_syntax_error(format_spec):
            ydl = YDL({'format': format_spec})
            info_dict = _make_result([{'format_id': 'foo', 'url': TEST_URL}])
            self.assertRaises(SyntaxError, ydl.process_ie_result, info_dict)

        assert_syntax_error('bestvideo,,best')
        assert_syntax_error('+bestaudio')
        assert_syntax_error('bestvideo+')
        assert_syntax_error('/')

    def test_format_filtering(self):
        formats = [
            {'format_id': 'A', 'filesize': 500, 'width': 1000},
            {'format_id': 'B', 'filesize': 1000, 'width': 500},
            {'format_id': 'C', 'filesize': 1000, 'width': 400},
            {'format_id': 'D', 'filesize': 2000, 'width': 600},
            {'format_id': 'E', 'filesize': 3000},
            {'format_id': 'F'},
            {'format_id': 'G', 'filesize': 1000000},
        ]
        for f in formats:
            f['url'] = 'http://_/'
            f['ext'] = 'unknown'
        info_dict = _make_result(formats)

        ydl = YDL({'format': 'best[filesize<3000]'})
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'D')

        ydl = YDL({'format': 'best[filesize<=3000]'})
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'E')

        ydl = YDL({'format': 'best[filesize <= ? 3000]'})
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'F')

        ydl = YDL({'format': 'best [filesize = 1000] [width>450]'})
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'B')

        ydl = YDL({'format': 'best [filesize = 1000] [width!=450]'})
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'C')

        ydl = YDL({'format': '[filesize>?1]'})
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'G')

        ydl = YDL({'format': '[filesize<1M]'})
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'E')

        ydl = YDL({'format': '[filesize<1MiB]'})
        ydl.process_ie_result(info_dict)
        downloaded = ydl.downloaded_info_dicts[0]
        self.assertEqual(downloaded['format_id'], 'G')

        ydl = YDL({'format': 'all[width>=400][width<=600]'})
        ydl.process_ie_result(info_dict)
        downloaded_ids = [info['format_id'] for info in ydl.downloaded_info_dicts]
        self.assertEqual(downloaded_ids, ['B', 'C', 'D'])

        ydl = YDL({'format': 'best[height<40]'})
        try:
            ydl.process_ie_result(info_dict)
        except ExtractorError:
            pass
        self.assertEqual(ydl.downloaded_info_dicts, [])


class TestYoutubeDL(unittest.TestCase):
    def test_subtitles(self):
        def s_formats(lang, autocaption=False):
            return [{
                'ext': ext,
                'url': 'http://localhost/video.%s.%s' % (lang, ext),
                '_auto': autocaption,
            } for ext in ['vtt', 'srt', 'ass']]
        subtitles = dict((l, s_formats(l)) for l in ['en', 'fr', 'es'])
        auto_captions = dict((l, s_formats(l, True)) for l in ['it', 'pt', 'es'])
        info_dict = {
            'id': 'test',
            'title': 'Test',
            'url': 'http://localhost/video.mp4',
            'subtitles': subtitles,
            'automatic_captions': auto_captions,
            'extractor': 'TEST',
        }

        def get_info(params={}):
            params.setdefault('simulate', True)
            ydl = YDL(params)
            ydl.report_warning = lambda *args, **kargs: None
            return ydl.process_video_result(info_dict, download=False)

        result = get_info()
        self.assertFalse(result.get('requested_subtitles'))
        self.assertEqual(result['subtitles'], subtitles)
        self.assertEqual(result['automatic_captions'], auto_captions)

        result = get_info({'writesubtitles': True})
        subs = result['requested_subtitles']
        self.assertTrue(subs)
        self.assertEqual(set(subs.keys()), set(['en']))
        self.assertTrue(subs['en'].get('data') is None)
        self.assertEqual(subs['en']['ext'], 'ass')

        result = get_info({'writesubtitles': True, 'subtitlesformat': 'foo/srt'})
        subs = result['requested_subtitles']
        self.assertEqual(subs['en']['ext'], 'srt')

        result = get_info({'writesubtitles': True, 'subtitleslangs': ['es', 'fr', 'it']})
        subs = result['requested_subtitles']
        self.assertTrue(subs)
        self.assertEqual(set(subs.keys()), set(['es', 'fr']))

        result = get_info({'writesubtitles': True, 'writeautomaticsub': True, 'subtitleslangs': ['es', 'pt']})
        subs = result['requested_subtitles']
        self.assertTrue(subs)
        self.assertEqual(set(subs.keys()), set(['es', 'pt']))
        self.assertFalse(subs['es']['_auto'])
        self.assertTrue(subs['pt']['_auto'])

        result = get_info({'writeautomaticsub': True, 'subtitleslangs': ['es', 'pt']})
        subs = result['requested_subtitles']
        self.assertTrue(subs)
        self.assertEqual(set(subs.keys()), set(['es', 'pt']))
        self.assertTrue(subs['es']['_auto'])
        self.assertTrue(subs['pt']['_auto'])

    def test_add_extra_info(self):
        test_dict = {
            'extractor': 'Foo',
        }
        extra_info = {
            'extractor': 'Bar',
            'playlist': 'funny videos',
        }
        YDL.add_extra_info(test_dict, extra_info)
        self.assertEqual(test_dict['extractor'], 'Foo')
        self.assertEqual(test_dict['playlist'], 'funny videos')

    def test_prepare_filename(self):
        info = {
            'id': '1234',
            'ext': 'mp4',
            'width': None,
        }

        def fname(templ):
            ydl = YoutubeDL({'outtmpl': templ})
            return ydl.prepare_filename(info)
        self.assertEqual(fname('%(id)s.%(ext)s'), '1234.mp4')
        self.assertEqual(fname('%(id)s-%(width)s.%(ext)s'), '1234-NA.mp4')
        # Replace missing fields with 'NA'
        self.assertEqual(fname('%(uploader_date)s-%(id)s.%(ext)s'), 'NA-1234.mp4')

    def test_format_note(self):
        ydl = YoutubeDL()
        self.assertEqual(ydl._format_note({}), '')
        assertRegexpMatches(self, ydl._format_note({
            'vbr': 10,
        }), '^\s*10k$')

    def test_postprocessors(self):
        filename = 'post-processor-testfile.mp4'
        audiofile = filename + '.mp3'

        class SimplePP(PostProcessor):
            def run(self, info):
                with open(audiofile, 'wt') as f:
                    f.write('EXAMPLE')
                return [info['filepath']], info

        def run_pp(params, PP):
            with open(filename, 'wt') as f:
                f.write('EXAMPLE')
            ydl = YoutubeDL(params)
            ydl.add_post_processor(PP())
            ydl.post_process(filename, {'filepath': filename})

        run_pp({'keepvideo': True}, SimplePP)
        self.assertTrue(os.path.exists(filename), '%s doesn\'t exist' % filename)
        self.assertTrue(os.path.exists(audiofile), '%s doesn\'t exist' % audiofile)
        os.unlink(filename)
        os.unlink(audiofile)

        run_pp({'keepvideo': False}, SimplePP)
        self.assertFalse(os.path.exists(filename), '%s exists' % filename)
        self.assertTrue(os.path.exists(audiofile), '%s doesn\'t exist' % audiofile)
        os.unlink(audiofile)

        class ModifierPP(PostProcessor):
            def run(self, info):
                with open(info['filepath'], 'wt') as f:
                    f.write('MODIFIED')
                return [], info

        run_pp({'keepvideo': False}, ModifierPP)
        self.assertTrue(os.path.exists(filename), '%s doesn\'t exist' % filename)
        os.unlink(filename)

    def test_match_filter(self):
        class FilterYDL(YDL):
            def __init__(self, *args, **kwargs):
                super(FilterYDL, self).__init__(*args, **kwargs)
                self.params['simulate'] = True

            def process_info(self, info_dict):
                super(YDL, self).process_info(info_dict)

            def _match_entry(self, info_dict, incomplete):
                res = super(FilterYDL, self)._match_entry(info_dict, incomplete)
                if res is None:
                    self.downloaded_info_dicts.append(info_dict)
                return res

        first = {
            'id': '1',
            'url': TEST_URL,
            'title': 'one',
            'extractor': 'TEST',
            'duration': 30,
            'filesize': 10 * 1024,
        }
        second = {
            'id': '2',
            'url': TEST_URL,
            'title': 'two',
            'extractor': 'TEST',
            'duration': 10,
            'description': 'foo',
            'filesize': 5 * 1024,
        }
        videos = [first, second]

        def get_videos(filter_=None):
            ydl = FilterYDL({'match_filter': filter_})
            for v in videos:
                ydl.process_ie_result(v, download=True)
            return [v['id'] for v in ydl.downloaded_info_dicts]

        res = get_videos()
        self.assertEqual(res, ['1', '2'])

        def f(v):
            if v['id'] == '1':
                return None
            else:
                return 'Video id is not 1'
        res = get_videos(f)
        self.assertEqual(res, ['1'])

        f = match_filter_func('duration < 30')
        res = get_videos(f)
        self.assertEqual(res, ['2'])

        f = match_filter_func('description = foo')
        res = get_videos(f)
        self.assertEqual(res, ['2'])

        f = match_filter_func('description =? foo')
        res = get_videos(f)
        self.assertEqual(res, ['1', '2'])

        f = match_filter_func('filesize > 5KiB')
        res = get_videos(f)
        self.assertEqual(res, ['1'])

    def test_playlist_items_selection(self):
        entries = [{
            'id': compat_str(i),
            'title': compat_str(i),
            'url': TEST_URL,
        } for i in range(1, 5)]
        playlist = {
            '_type': 'playlist',
            'id': 'test',
            'entries': entries,
            'extractor': 'test:playlist',
            'extractor_key': 'test:playlist',
            'webpage_url': 'http://example.com',
        }

        def get_ids(params):
            ydl = YDL(params)
            # make a copy because the dictionary can be modified
            ydl.process_ie_result(playlist.copy())
            return [int(v['id']) for v in ydl.downloaded_info_dicts]

        result = get_ids({})
        self.assertEqual(result, [1, 2, 3, 4])

        result = get_ids({'playlistend': 10})
        self.assertEqual(result, [1, 2, 3, 4])

        result = get_ids({'playlistend': 2})
        self.assertEqual(result, [1, 2])

        result = get_ids({'playliststart': 10})
        self.assertEqual(result, [])

        result = get_ids({'playliststart': 2})
        self.assertEqual(result, [2, 3, 4])

        result = get_ids({'playlist_items': '2-4'})
        self.assertEqual(result, [2, 3, 4])

        result = get_ids({'playlist_items': '2,4'})
        self.assertEqual(result, [2, 4])

        result = get_ids({'playlist_items': '10'})
        self.assertEqual(result, [])


if __name__ == '__main__':
    unittest.main()