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Revert "Add support for more qualities, merging video+audio using MSE"

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This reverts commit d56df02e7b1eba86baf511289208295b1f6c5a50.
This commit is contained in:
Jesús 2021-08-29 18:48:01 -05:00
parent d56df02e7b
commit e4af99fd17
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GPG Key ID: F6EE7BC59A315766
7 changed files with 31 additions and 575 deletions
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3
server.py
View File

@ -87,9 +87,6 @@ def proxy_site(env, start_response, video=False):
response_headers = response.getheaders()
if isinstance(response_headers, urllib3._collections.HTTPHeaderDict):
response_headers = response_headers.items()
if video:
response_headers = (list(response_headers)
+[('Access-Control-Allow-Origin', '*')])
if first_attempt:
start_response(str(response.status) + ' ' + response.reason,

5
settings.py
View File

@ -156,14 +156,9 @@ For security reasons, enabling this is not recommended.''',
'default': 720,
'comment': '',
'options': [
(144, '144p'),
(240, '240p'),
(360, '360p'),
(480, '480p'),
(720, '720p'),
(1080, '1080p'),
(1440, '1440p'),
(2160, '2160p'),
],
'category': 'playback',
}),

445
youtube/static/js/av-merge.js
View File

@ -1,445 +0,0 @@
// Heavily modified from
// https://github.com/nickdesaulniers/netfix/issues/4#issuecomment-578856471
// which was in turn modified from
// https://github.com/nickdesaulniers/netfix/blob/gh-pages/demo/bufferWhenNeeded.html
// Useful reading:
// https://stackoverflow.com/questions/35177797/what-exactly-is-fragmented-mp4fmp4-how-is-it-different-from-normal-mp4
// https://axel.isouard.fr/blog/2016/05/24/streaming-webm-video-over-html5-with-media-source
// We start by parsing the sidx (segment index) table in order to get the
// byte ranges of the segments. The byte range of the sidx table is provided
// by the indexRange variable by YouTube
// Useful info, as well as segments vs sequence mode (we use segments mode)
// https://joshuatz.com/posts/2020/appending-videos-in-javascript-with-mediasource-buffers/
// SourceBuffer data limits:
// https://developers.google.com/web/updates/2017/10/quotaexceedederror
// TODO: Better buffering algorithm
// TODO: Call abort to cancel in-progress appends?
var video_source = data['pair_sources'][data['pair_idx']][0];
var audio_source = data['pair_sources'][data['pair_idx']][1];
var audioStream = null;
var videoStream = null;
var seeking = false;
var video = document.querySelector('video');
var mediaSource = null;
setup();
function setup() {
if ('MediaSource' in window
&& MediaSource.isTypeSupported(audio_source['mime_codec'])
&& MediaSource.isTypeSupported(video_source['mime_codec'])) {
mediaSource = new MediaSource();
video.src = URL.createObjectURL(mediaSource);
mediaSource.addEventListener('sourceopen', sourceOpen);
} else {
reportError('Unsupported MIME type or codec: ',
audio_source['mime_codec'],
video_source['mime_codec']);
}
}
function sourceOpen(_) {
videoStream = new Stream(mediaSource, video_source);
audioStream = new Stream(mediaSource, audio_source);
videoStream.setup();
audioStream.setup();
video.addEventListener('timeupdate', checkBothBuffers);
video.addEventListener('seeking', debounce(seek, 500));
//video.addEventListener('seeked', function() {console.log('seeked')});
}
function Stream(mediaSource, source) {
this.url = source['url'];
this.mimeCodec = source['mime_codec']
this.streamType = source['acodec'] ? 'audio' : 'video';
this.initRange = source['init_range'];
this.indexRange = source['index_range'];
this.mediaSource = mediaSource;
this.sidx = null;
this.appendRetries = 0;
this.appendQueue = []; // list of [segmentIdx, data]
this.sourceBuffer = mediaSource.addSourceBuffer(this.mimeCodec);
this.sourceBuffer.mode = 'segments';
this.sourceBuffer.addEventListener('error', (e) => {
this.reportError('sourceBuffer error', e);
});
this.sourceBuffer.addEventListener('updateend', (e) => {
this.reportDebug('updateend', e);
if (this.appendQueue.length != 0) {
this.appendSegment(...this.appendQueue.pop());
}
});
}
Stream.prototype.setup = async function(){
// Group requests together
if (this.initRange.end+1 == this.indexRange.start){
fetchRange(
this.url,
this.initRange.start,
this.indexRange.end,
(buffer) => {
var init_end = this.initRange.end - this.initRange.start + 1;
var index_start = this.indexRange.start - this.initRange.start;
var index_end = this.indexRange.end - this.initRange.start + 1;
this.appendSegment(null, buffer.slice(0, init_end));
this.setupSegments(buffer.slice(index_start, index_end));
}
)
} else {
// initialization data
await fetchRange(
this.url,
this.initRange.start,
this.initRange.end,
this.appendSegment.bind(this, null),
);
// sidx (segment index) table
fetchRange(
this.url,
this.indexRange.start,
this.indexRange.end,
this.setupSegments.bind(this)
);
}
}
Stream.prototype.setupSegments = async function(sidxBox){
var box = unbox(sidxBox);
this.sidx = sidx_parse(box.data, this.indexRange.end+1);
this.reportDebug('sidx', this.sidx);
this.reportDebug('appending first segment');
this.fetchSegmentIfNeeded(0);
}
Stream.prototype.appendSegment = function(segmentIdx, chunk) {
// cannot append right now, schedule for updateend
if (this.sourceBuffer.updating) {
this.reportDebug('sourceBuffer updating, queueing for later');
this.appendQueue.push([segmentIdx, chunk]);
if (this.appendQueue.length > 2){
this.reportWarning('appendQueue length:', this.appendQueue.length);
}
return;
}
try {
this.sourceBuffer.appendBuffer(chunk);
if (segmentIdx !== null)
this.sidx.entries[segmentIdx].have = true;
this.appendRetries = 0;
} catch (e) {
if (e.name !== 'QuotaExceededError') {
throw e;
}
// Delete 3 segments (arbitrary) from beginning of buffer, making sure
// not to delete current one
var currentSegment = this.getSegmentIdx(video.currentTime);
this.reportDebug('QuotaExceededError. Deleting segments.');
var numDeleted = 0;
var i = 0;
while (numDeleted < 3 && i < currentSegment) {
let entry = this.sidx.entries[i];
let start = entry.tickStart/this.sidx.timeScale;
let end = entry.tickEnd/this.sidx.timeScale;
if (entry.have) {
this.reportDebug('Deleting segment', i);
this.sourceBuffer.remove(start, end);
}
}
}
}
Stream.prototype.getSegmentIdx = function(videoTime) {
// get an estimate
var currentTick = videoTime * this.sidx.timeScale;
var firstSegmentDuration = this.sidx.entries[0].subSegmentDuration;
var index = 1 + Math.floor(currentTick / firstSegmentDuration);
var index = clamp(index, 0, this.sidx.entries.length - 1);
var increment = 1;
if (currentTick < this.sidx.entries[index].tickStart){
increment = -1;
}
// go up or down to find correct index
while (index >= 0 && index < this.sidx.entries.length) {
var entry = this.sidx.entries[index];
if (entry.tickStart <= currentTick && entry.tickEnd >= currentTick){
return index;
}
index = index + increment;
}
this.reportError('Could not find segment index for time', videoTime);
return 0;
}
Stream.prototype.shouldFetchNextSegment = function(nextSegment) {
// > 15% done with current segment
if (nextSegment >= this.sidx.entries.length){
return false;
}
var entry = this.sidx.entries[nextSegment - 1];
var currentTick = video.currentTime * this.sidx.timeScale;
return currentTick > (entry.tickStart + entry.subSegmentDuration*0.15);
}
Stream.prototype.checkBuffer = async function() {
this.reportDebug('check Buffer');
if (seeking) {
return;
}
var nextSegment = this.getSegmentIdx(video.currentTime) + 1;
if (this.shouldFetchNextSegment(nextSegment)) {
this.fetchSegmentIfNeeded(nextSegment);
}
}
Stream.prototype.segmentInBuffer = function(segmentIdx) {
var entry = this.sidx.entries[segmentIdx];
// allow for 0.01 second error
var timeStart = entry.tickStart/this.sidx.timeScale + 0.01;
var timeEnd = entry.tickEnd/this.sidx.timeScale - 0.01;
var timeRanges = this.sourceBuffer.buffered;
for (var i=0; i < timeRanges.length; i++) {
if (timeRanges.start(i) <= timeStart && timeEnd <= timeRanges.end(i)) {
return true;
}
}
return false;
}
Stream.prototype.fetchSegmentIfNeeded = function(segmentIdx) {
entry = this.sidx.entries[segmentIdx];
// check if we had it before, but it was deleted by the browser
if (entry.have && !this.segmentInBuffer(segmentIdx)) {
this.reportDebug('segment', segmentIdx, 'deleted by browser');
entry.have = false;
entry.requested = false;
}
if (entry.requested) {
return;
}
if (segmentIdx < 0 || segmentIdx >= this.sidx.entries.length){
return;
}
entry.requested = true;
fetchRange(
this.url,
entry.start,
entry.end,
this.appendSegment.bind(this, segmentIdx),
);
}
Stream.prototype.handleSeek = async function() {
var segmentIdx = this.getSegmentIdx(video.currentTime);
this.fetchSegmentIfNeeded(segmentIdx);
}
Stream.prototype.reportDebug = function(...args) {
reportDebug(String(this.streamType) + ':', ...args);
}
Stream.prototype.reportWarning = function(...args) {
reportWarning(String(this.streamType) + ':', ...args);
}
Stream.prototype.reportError = function(...args) {
reportError(String(this.streamType) + ':', ...args);
}
function checkBothBuffers() {
audioStream.checkBuffer();
videoStream.checkBuffer();
}
function seek(e) {
if (mediaSource.readyState === 'open') {
seeking = true;
audioStream.handleSeek();
videoStream.handleSeek();
seeking = false;
} else {
this.reportWarning('seek but not open? readyState:',
mediaSource.readyState);
}
}
// Utility functions
function fetchRange(url, start, end, cb) {
reportDebug('fetchRange', start, end);
return new Promise((resolve, reject) => {
var xhr = new XMLHttpRequest();
xhr.open('get', url);
xhr.responseType = 'arraybuffer';
xhr.setRequestHeader('Range', 'bytes=' + start + '-' + end);
xhr.onload = function() {
reportDebug('fetched bytes: ', start, end);
//bytesFetched += end - start + 1;
resolve(cb(xhr.response));
};
xhr.send();
});
}
function debounce(func, wait, immediate) {
var timeout;
return function() {
var context = this;
var args = arguments;
var later = function() {
timeout = null;
if (!immediate) func.apply(context, args);
};
var callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
if (callNow) func.apply(context, args);
};
}
function clamp(number, min, max) {
return Math.max(min, Math.min(number, max));
}
function reportWarning(...args){
console.log(...args);
}
function reportError(...args){
console.log(...args);
}
function reportDebug(...args){
console.log(...args);
}
function byteArrayToIntegerLittleEndian(unsignedByteArray){
var result = 0;
for (byte of unsignedByteArray){
result = result*256;
result += byte
}
return result;
}
function ByteParser(data){
this.curIndex = 0;
this.data = new Uint8Array(data);
}
ByteParser.prototype.readInteger = function(nBytes){
var result = byteArrayToIntegerLittleEndian(
this.data.slice(this.curIndex, this.curIndex + nBytes)
);
this.curIndex += nBytes;
return result;
}
ByteParser.prototype.readBufferBytes = function(nBytes){
var result = this.data.slice(this.curIndex, this.curIndex + nBytes);
this.curIndex += nBytes;
return result;
}
// BEGIN iso-bmff-parser-stream/lib/box/sidx.js (modified)
// https://github.com/necccc/iso-bmff-parser-stream/blob/master/lib/box/sidx.js
/* The MIT License (MIT)
Copyright (c) 2014 Szabolcs Szabolcsi-Toth
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.*/
function sidx_parse (data, offset) {
var bp = new ByteParser(data),
version = bp.readInteger(1),
flags = bp.readInteger(3),
referenceId = bp.readInteger(4),
timeScale = bp.readInteger(4),
earliestPresentationTime = bp.readInteger(version === 0 ? 4 : 8),
firstOffset = bp.readInteger(4),
__reserved = bp.readInteger(2),
entryCount = bp.readInteger(2),
entries = [];
var totalBytesOffset = firstOffset + offset;
var totalTicks = 0;
for (var i = entryCount; i > 0; i=i-1 ) {
let referencedSize = bp.readInteger(4),
subSegmentDuration = bp.readInteger(4),
unused = bp.readBufferBytes(4)
entries.push({
referencedSize: referencedSize,
subSegmentDuration: subSegmentDuration,
unused: unused,
start: totalBytesOffset,
end: totalBytesOffset + referencedSize - 1, // inclusive
tickStart: totalTicks,
tickEnd: totalTicks + subSegmentDuration - 1,
requested: false,
have: false,
});
totalBytesOffset = totalBytesOffset + referencedSize;
totalTicks = totalTicks + subSegmentDuration;
}
return {
version: version,
flags: flags,
referenceId: referenceId,
timeScale: timeScale,
earliestPresentationTime: earliestPresentationTime,
firstOffset: firstOffset,
entries: entries
};
}
// END sidx.js
// BEGIN iso-bmff-parser-stream/lib/unbox.js (same license), modified
function unbox(buf) {
var bp = new ByteParser(buf),
bufferLength = buf.length,
length,
typeData,
boxData
length = bp.readInteger(4); // length of entire box,
typeData = bp.readInteger(4);
if (bufferLength - length < 0) {
reportWarning('Warning: sidx table is cut off');
return {
currentLength: bufferLength,
length: length,
type: typeData,
data: bp.readBufferBytes(bufferLength)
};
}
boxData = bp.readBufferBytes(length - 8);
return {
length: length,
type: typeData,
data: boxData
};
}
// END unbox.js

2
youtube/templates/base.html
View File

@ -3,7 +3,7 @@
<head>
<meta charset="UTF-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' 'unsafe-inline' 'unsafe-eval'; media-src 'self' blob: https://*.googlevideo.com; {{ "img-src 'self' https://*.googleusercontent.com https://*.ggpht.com https://*.ytimg.com;" if not settings.proxy_images else "" }}">
<meta http-equiv="Content-Security-Policy" content="default-src 'self' 'unsafe-inline' 'unsafe-eval'; media-src 'self' https://*.googlevideo.com; {{ "img-src 'self' https://*.googleusercontent.com https://*.ggpht.com https://*.ytimg.com;" if not settings.proxy_images else "" }}"/>
<title>{{ page_title }}</title>
<link title="YT Local" href="/youtube.com/opensearch.xml" rel="search" type="application/opensearchdescription+xml"/>
<link href="/youtube.com/static/favicon.ico" type="image/x-icon" rel="icon"/>

12
youtube/templates/watch.html
View File

@ -29,7 +29,7 @@
{% endif %}
</span>
</div>
{% elif (uni_sources.__len__() == 0 or live) and hls_formats.__len__() != 0 %}
{% elif (video_sources.__len__() == 0 or live) and hls_formats.__len__() != 0 %}
<div class="live-url-choices">
<span>Copy a url into your video player:</span>
<ol>
@ -41,9 +41,9 @@
{% else %}
<figure class="sc-video">
<video id="js-video-player" playsinline controls>
{% if uni_sources %}
<source src="{{ uni_sources[uni_idx]['url'] }}" type="{{ uni_sources[uni_idx]['type'] }}" data-res="{{ uni_sources[uni_idx]['quality'] }}">
{% endif %}
{% for video_source in video_sources %}
<source src="{{ video_source['src'] }}" type="{{ video_source['type'] }}" data-res="{{ video_source['quality'] }}">
{% endfor %}
{% for source in subtitle_sources %}
{% if source['on'] %}
@ -55,10 +55,6 @@
</video>
</figure>
{% if pair_sources and (not uni_sources or pair_sources[pair_idx][0]['quality'] != uni_sources[uni_idx]['quality']) %}
<script src="/youtube.com/static/js/av-merge.js"></script>
{% endif %}
{% if time_start != 0 %}
<script>
document.getElementById('js-video-player').currentTime = {{ time_start|tojson }};

127
youtube/watch.py
View File

@ -24,97 +24,25 @@ except FileNotFoundError:
def get_video_sources(info):
'''return dict with organized sources: {
'uni_sources': [{}, ...], # video and audio in one file
'uni_idx': int, # default unified source index
'pair_sources': [({video}, {audio}), ...],
'pair_idx': int, # default pair source index
}
'''
audio_sources = []
video_only_sources = []
uni_sources = []
pair_sources = []
target_resolution = settings.default_resolution
video_sources = []
max_resolution = settings.default_resolution
for fmt in info['formats']:
if not all(fmt[attr] for attr in ('ext', 'url')):
if not all(fmt[attr] for attr in ('quality', 'width', 'ext', 'url')):
continue
if fmt['ext'] != 'mp4': # temporary until webm support
continue
# unified source
if fmt['acodec'] and fmt['vcodec']:
source = {
if (fmt['acodec'] and fmt['vcodec']
and fmt['quality'] <= max_resolution):
video_sources.append({
'src': fmt['url'],
'type': 'video/' + fmt['ext'],
}
source.update(fmt)
uni_sources.append(source)
continue
'quality': fmt['quality'],
'height': fmt['height'],
'width': fmt['width'],
})
if not (fmt['init_range'] and fmt['index_range']):
continue
# order the videos sources so the preferred resolution is first #
video_sources.sort(key=lambda source: source['quality'], reverse=True)
# audio source
if fmt['acodec'] and not fmt['vcodec'] and fmt['audio_bitrate']:
source = {
'type': 'audio/' + fmt['ext'],
'bitrate': fmt['audio_bitrate'],
}
source.update(fmt)
source['mime_codec'] = (source['type'] + '; codecs="'
+ source['acodec'] + '"')
audio_sources.append(source)
# video-only source, include audio source
elif all(fmt[attr] for attr in ('vcodec', 'quality', 'width')):
source = {
'type': 'video/' + fmt['ext'],
}
source.update(fmt)
source['mime_codec'] = (source['type'] + '; codecs="'
+ source['vcodec'] + '"')
video_only_sources.append(source)
audio_sources.sort(key=lambda source: source['audio_bitrate'])
video_only_sources.sort(key=lambda src: src['quality'])
uni_sources.sort(key=lambda src: src['quality'])
for source in video_only_sources:
# choose an audio source to go with it
# 0.15 is semiarbitrary empirical constant to spread audio sources
# between 144p and 1080p. Use something better eventually.
target_audio_bitrate = source['quality']*source.get('fps', 30)/30*0.15
compat_audios = [a for a in audio_sources if a['ext'] == source['ext']]
if compat_audios:
closest_audio_source = compat_audios[0]
best_err = target_audio_bitrate - compat_audios[0]['audio_bitrate']
best_err = abs(best_err)
for audio_source in compat_audios[1:]:
err = abs(audio_source['audio_bitrate'] - target_audio_bitrate)
# once err gets worse we have passed the closest one
if err > best_err:
break
best_err = err
closest_audio_source = audio_source
pair_sources.append((source, closest_audio_source))
uni_idx = 0 if uni_sources else None
for i, source in enumerate(uni_sources):
if source['quality'] > target_resolution:
break
uni_idx = i
pair_idx = 0 if pair_sources else None
for i, source_pair in enumerate(pair_sources):
if source_pair[0]['quality'] > target_resolution:
break
pair_idx = i
return {
'uni_sources': uni_sources,
'uni_idx': uni_idx,
'pair_sources': pair_sources,
'pair_idx': pair_idx,
}
return video_sources
def make_caption_src(info, lang, auto=False, trans_lang=None):
@ -510,11 +438,10 @@ def get_watch_page(video_id=None):
item['url'] += '&index=' + str(item['index'])
info['playlist']['author_url'] = util.prefix_url(
info['playlist']['author_url'])
if settings.img_prefix:
# Don't prefix hls_formats for now because the urls inside the manifest
# would need to be prefixed as well.
for fmt in info['formats']:
fmt['url'] = util.prefix_url(fmt['url'])
# Don't prefix hls_formats for now because the urls inside the manifest
# would need to be prefixed as well.
for fmt in info['formats']:
fmt['url'] = util.prefix_url(fmt['url'])
# Add video title to end of url path so it has a filename other than just
# "videoplayback" when downloaded
@ -550,14 +477,9 @@ def get_watch_page(video_id=None):
'codecs': codecs_string,
})
source_info = get_video_sources(info)
uni_idx = source_info['uni_idx']
video_height = yt_data_extract.deep_get(source_info, 'uni_sources',
uni_idx, 'height',
default=360)
video_width = yt_data_extract.deep_get(source_info, 'uni_sources',
uni_idx, 'width',
default=640)
video_sources = get_video_sources(info)
video_height = yt_data_extract.deep_get(video_sources, 0, 'height', default=360)
video_width = yt_data_extract.deep_get(video_sources, 0, 'width', default=640)
# 1 second per pixel, or the actual video width
theater_video_target_width = max(640, info['duration'] or 0, video_width)
@ -602,6 +524,7 @@ def get_watch_page(video_id=None):
download_formats = download_formats,
other_downloads = other_downloads,
video_info = json.dumps(video_info),
video_sources = video_sources,
hls_formats = info['hls_formats'],
subtitle_sources = subtitle_sources,
related = info['related_videos'],
@ -634,14 +557,12 @@ def get_watch_page(video_id=None):
time_start = time_start,
js_data = {
'video_id': info['id'],
'video_duration': info['duration'],
'video_id': video_info['id'],
'settings': settings.current_settings_dict,
'has_manual_captions': any(s.get('on') for s in subtitle_sources),
**source_info,
},
# for embed page
font_family=youtube.font_choices[settings.font],
**source_info,
)

12
youtube/yt_data_extract/watch_extraction.py
View File

@ -415,21 +415,13 @@ def _extract_formats(info, player_response):
fmt['itag'] = itag
fmt['ext'] = None
fmt['audio_bitrate'] = None
fmt['bitrate'] = yt_fmt.get('bitrate')
fmt['acodec'] = None
fmt['vcodec'] = None
fmt['width'] = yt_fmt.get('width')
fmt['height'] = yt_fmt.get('height')
fmt['file_size'] = yt_fmt.get('contentLength')
fmt['audio_sample_rate'] = extract_int(yt_fmt.get('audioSampleRate'))
fmt['duration_ms'] = yt_fmt.get('approxDurationMs')
fmt['audio_sample_rate'] = yt_fmt.get('audioSampleRate')
fmt['fps'] = yt_fmt.get('fps')
fmt['init_range'] = yt_fmt.get('initRange')
fmt['index_range'] = yt_fmt.get('indexRange')
for key in ('init_range', 'index_range'):
if fmt[key]:
fmt[key]['start'] = int(fmt[key]['start'])
fmt[key]['end'] = int(fmt[key]['end'])
update_format_with_type_info(fmt, yt_fmt)
cipher = dict(urllib.parse.parse_qsl(multi_get(yt_fmt,
'cipher', 'signatureCipher', default='')))
@ -467,7 +459,7 @@ def extract_hls_formats(hls_manifest):
if lines[i].startswith('#EXT-X-STREAM-INF'):
fmt = {'acodec': None, 'vcodec': None, 'height': None,
'width': None, 'fps': None, 'audio_bitrate': None,
'itag': None, 'file_size': None, 'duration_ms': None,
'itag': None, 'file_size': None,
'audio_sample_rate': None, 'url': None}
properties = lines[i].split(':')[1]
properties += ',' # make regex work for last key-value pair