tytd/Tesses.YouTubeDownloader/DownloadLoop.cs

824 lines
34 KiB
C#

using System;
using YoutubeExplode;
using YoutubeExplode.Videos;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Net.Http;
using YoutubeExplode.Videos.Streams;
using System.IO;
using System.Diagnostics;
using System.Text;
using System.Globalization;
using Newtonsoft.Json;
namespace Tesses.YouTubeDownloader
{
public abstract partial class TYTDStorage
{
private async Task DownloadLoop(CancellationToken token = default(CancellationToken))
{
while (!token.IsCancellationRequested)
{
try{
bool hasAny;
var (Video, Resolution) = Dequeue(out hasAny);
if (hasAny)
{
await DownloadVideoAsync(Video, Resolution, token,new Progress<double>(
async (e)=>{
await ReportProgress(e);
}
),true);
}
}catch(Exception ex)
{
await GetLogger().WriteAsync(ex);
}
}
}
private CancellationTokenSource currentVideoCancelSource=null;
public readonly SavedVideoProgress Progress = new SavedVideoProgress();
private async Task ReportProgress(double progress)
{
Progress.Progress = (int)(progress * 100);
Progress.ProgressRaw = progress;
if (ExtensionContext != null)
{
foreach (var ext in ExtensionContext.Extensions)
{
await ext.VideoProgress(Progress.Video, progress);
}
}
VideoProgressEventArgs args=new VideoProgressEventArgs();
args.VideoInfo=Progress.Video;
args.Progress=progress;
VideoProgress?.Invoke(this,args);
}
private async Task ReportStartVideo(SavedVideo video, Resolution resolution, long length)
{
GetLogger().WriteAsync(video).Wait();
Progress.Video = video;
Progress.Progress = 0;
Progress.ProgressRaw = 0;
Progress.Length = length;
if (ExtensionContext != null)
{
foreach (var item in ExtensionContext.Extensions)
{
await item.VideoStarted(video, resolution, length);
}
}
VideoStartedEventArgs args=new VideoStartedEventArgs();
args.VideoInfo=video;
args.Resolution=resolution;
args.EstimatedLength=length;
VideoStarted?.Invoke(this,args);
}
private async Task ReportEndVideo(SavedVideo video, Resolution resolution)
{
Progress.Progress = 100;
Progress.ProgressRaw = 1;
if (ExtensionContext != null)
{
foreach (var item in ExtensionContext.Extensions)
{
await item.VideoFinished(video, resolution);
}
}
VideoFinishedEventArgs args=new VideoFinishedEventArgs();
args.VideoInfo=video;
args.Resolution = resolution;
VideoFinished?.Invoke(this,args);
}
public async Task DownloadNoQueue(SavedVideo info,Resolution resolution=Resolution.Mux,CancellationToken token=default(CancellationToken),IProgress<double> progress=null)
{
await DownloadVideoAsync(info,resolution,token,progress,false);
}
public async Task<SavedVideo> GetSavedVideoAsync(VideoId id)
{
VideoMediaContext context=new VideoMediaContext(id,Resolution.PreMuxed);
List<(SavedVideo Video,Resolution)> s=new List<(SavedVideo Video, Resolution)>();
await context.FillQueue(this,s);
if(s.Count> 0)
{
return s.First().Video;
}
return null;
}
private async Task DownloadVideoAsync(SavedVideo video, Resolution resolution, CancellationToken token=default(CancellationToken),IProgress<double> progress=null,bool report=true)
{
begin_download:
try{
if(video.DownloadFrom == "YouTube")
{
switch (resolution)
{
case Resolution.Mux:
await DownloadVideoMuxedAsync(video,token,progress,report);
break;
case Resolution.PreMuxed:
await DownloadPreMuxedVideoAsync(video, token,progress,report);
break;
case Resolution.AudioOnly:
await DownloadAudioOnlyAsync(video,token,progress,report);
break;
case Resolution.VideoOnly:
await DownloadVideoOnlyAsync(video,token,progress,report);
break;
}
}else if(video.DownloadFrom.StartsWith("NormalDownload,Length="))
{
await DownloadFileAsync(video,token,progress,report);
}
}catch(Exception ex)
{
VideoId? id=VideoId.TryParse(video.Id);
if(id.HasValue){
await GetLogger().WriteAsync(ex,id.Value);
}else{
await GetLogger().WriteAsync(ex);
}
}
cancelDownload=false;
if(restartDownload)
{
restartDownload=false;
goto begin_download;
}
}
public bool cancelDownload=false;
public bool restartDownload=false;
public void CancelDownload(bool restart=false)
{
cancelDownload=true;
restartDownload=restart;
if(currentVideoCancelSource != null) currentVideoCancelSource.Cancel();
}
private async Task DownloadFileAsync(SavedVideo video, CancellationToken token, IProgress<double> progress, bool report)
{
string incomplete_file_path = $"Download/{B64.Base64UrlEncodes(video.Id)}-incomplete.part";
string file_path = $"Download/{B64.Base64UrlEncodes(video.Id)}.bin";
string url = video.Id;
bool canSeek=false;
long length=0;
foreach(var kvp in video.DownloadFrom.Split(',').Select<string,KeyValuePair<string,string>>((e)=>{
if(!e.Contains('=')) return new KeyValuePair<string, string>("","");
string[] keyVP = e.Split(new char[]{'='},2);
return new KeyValuePair<string, string>(keyVP[0],keyVP[1]);}))
{
switch(kvp.Key)
{
case "CanSeek":
bool.TryParse(kvp.Value,out canSeek);
break;
case "Length":
long len;
if(long.TryParse(kvp.Value,out len))
{
length=len;
}
break;
}
}
await ReportStartVideo(video,Resolution.PreMuxed,length);
Func<long,Task<Stream>> openDownload = async(e)=>{
HttpRequestMessage msg=new HttpRequestMessage(HttpMethod.Get,url);
if(e > 0)
{
msg.Headers.Range.Ranges.Add(new System.Net.Http.Headers.RangeItemHeaderValue(e,null));
}
var res=await HttpClient.SendAsync(msg);
return await res.Content.ReadAsStreamAsync();
};
if(await Continue(file_path))
{
bool deleteAndRestart=false;
using(var file = await OpenOrCreateAsync(incomplete_file_path))
{
if(file.Length > 0 && !canSeek)
{
deleteAndRestart = true;
}
if(!deleteAndRestart)
{
Stream strm=await openDownload(file.Length);
bool res=await CopyStreamAsync(strm,file,0,length,4096,progress,token);
if(res)
{
RenameFile(incomplete_file_path,file_path);
if(report)
await ReportEndVideo(video, Resolution.PreMuxed);
}
}
}
if(deleteAndRestart){
DeleteFile(incomplete_file_path);
using(var file = await OpenOrCreateAsync(incomplete_file_path))
{
Stream strm=await openDownload(0);
bool res=await CopyStreamAsync(strm,file,0,length,4096,progress,token);
if(res)
{
RenameFile(incomplete_file_path,file_path);
if(report)
await ReportEndVideo(video, Resolution.PreMuxed);
}
}
}
}
}
public async Task<bool> Continue(string path)
{
if (await FileExistsAsync(path))
{
return ((await OpenReadAsync(path)).Length == 0);
}
return true;
}
private static async Task<bool> run_process(string filename,CancellationToken token,params string[] args)
{
return await run_process(filename,null,token,args);
}
private static async Task<bool> run_process(string filename,IProgress<string> new_line,CancellationToken token, params string[] args)
{
using(Process process=new Process()){
process.StartInfo.FileName = filename;
StringBuilder builder=new StringBuilder();
foreach(var arg in args)
{
builder.Append($"\"{arg}\" ");
}
process.StartInfo.Arguments=builder.ToString();
if(new_line !=null)
{
process.StartInfo.UseShellExecute=false;
process.StartInfo.RedirectStandardError=true;
process.StartInfo.RedirectStandardOutput=true;
}
try{
if(process.Start())
{
if(new_line != null)
{
while(!process.HasExited)
{
if(token.IsCancellationRequested)
{
process.Kill();
}
new_line.Report(await process.StandardError.ReadLineAsync());
}
}else{
while(!process.HasExited)
{
if(token.IsCancellationRequested)
{
process.Kill();
}
await Task.Delay(100);
}
}
}
}catch(Exception ex)
{
_=ex;
Console.WriteLine("FFMPEG ERROR, sorry cant read logging config");
return false;
}
return true;
}
}
protected async Task<bool> Convert(SavedVideo video,string videoFile,string audioFile,string outFile,CancellationToken token,IProgress<string> new_line,string ffmpeg="ffmpeg")
{
Func<string,string> escape_ffmetadata_str = (e)=>{
StringBuilder builder=new StringBuilder(e);
builder.Replace("\r\n","\n");
foreach(var item in new char[] {'\\','#',';','=','\n'})
{
builder.Replace(item.ToString(), $"\\{item}");
}
return builder.ToString();
};
Action<List<string>,Chapter> add_chapter = (list,chapter)=>{
list.Add("[CHAPTER]");
list.Add("TIMEBASE=1/1");
list.Add($"START={(int)chapter.Offset.TotalSeconds}");
list.Add($"END={(int)(chapter.Offset.Add(chapter.Length).TotalSeconds)}");
list.Add($"TITLE={escape_ffmetadata_str(chapter.ChapterName)}");
list.Add("");
};
string txtFile=Path.Combine("TYTD_TEMP","video_info.txt");
DeleteIfExists (txtFile);
if(! await run_process(ffmpeg,token,"-y","-i",videoFile,"-f","ffmetadata",txtFile))
{
return false;
}
List<string> entries=File.ReadAllLines(txtFile).ToList();
if(token.IsCancellationRequested)
{
return false;
}
entries.Add($"title={escape_ffmetadata_str(video.Title)}");
entries.Add($"artist={escape_ffmetadata_str(video.AuthorTitle)}");
entries.Add($"description={escape_ffmetadata_str(video.Description)}");
entries.Add($"comments=videoId\\={video.Id},likes\\={video.Likes},views\\={video.Views},authorChannelId\\={video.AuthorChannelId}");
entries.Add("");
foreach(var chapter in video.GetChapters())
{
// Console.WriteLine(chapter.ChapterName);
add_chapter(entries,chapter);
}
File.WriteAllLines(txtFile,entries);
return await run_process(ffmpeg,new_line,token,"-y","-i",videoFile,"-i",txtFile,"-i",audioFile,"-map_metadata","1","-c","copy","-map","0:v","-map","2:a",outFile);
}
private async Task<bool> CopyStreamAsync(Stream src,Stream dest,long pos=0,long len=0,int bufferSize=4096,IProgress<double> progress=null,CancellationToken token=default(CancellationToken))
{
if(pos > 0)
{
src.Position=pos;
dest.Position=pos;
}
double curPos = pos;
int read;
byte[] buffer=new byte[bufferSize];
do{
read=await src.ReadAsync(buffer,0,buffer.Length,token);
if(token.IsCancellationRequested || restartDownload || cancelDownload)
{
return false;
}
curPos+=read;
await dest.WriteAsync(buffer,0,read);
if(progress != null && len != 0)
{
progress.Report(curPos / len);
}
}while(read>0 && !token.IsCancellationRequested && !restartDownload && !cancelDownload);
if(token.IsCancellationRequested || restartDownload || cancelDownload)
{
return false;
}
return true;
}
public abstract Task<Stream> OpenOrCreateAsync(string path);
public abstract void RenameFile(string src,string dest);
public static string FFmpeg {get;set;}
public virtual async Task<bool> MuxVideosAsync(SavedVideo video,string videoSrc,string audioSrc,string videoDest,IProgress<double> progress=null,CancellationToken token=default(CancellationToken))
{
if(string.IsNullOrWhiteSpace(FFmpeg))
{
return false;
}
Func<string,TimeSpan> get_percent=(e)=>{
if(string.IsNullOrWhiteSpace(e))
return TimeSpan.Zero;
int index=e.IndexOf("time=");
if(index < 0)
return TimeSpan.Zero;
int spaceIndex=e.IndexOf(' ',index+5);
string j=e.Substring(index+5,spaceIndex-(index+5));
double val;
if(double.TryParse(j,out val))
return TimeSpan.FromSeconds(val);
return TimeSpan.ParseExact(j, "c", CultureInfo.InvariantCulture);
//return TimeSpan.Zero;
};
bool ret=false;
string video_bin=Path.Combine("TYTD_TEMP","video.bin");
string audio_bin=Path.Combine("TYTD_TEMP","audio.bin");
string output_mkv=Path.Combine("TYTD_TEMP","output.mkv");
Directory.CreateDirectory("TYTD_TEMP");
//hince we are in a unknown environment we need to copy video
DeleteIfExists(video_bin);
DeleteIfExists(audio_bin);
DeleteIfExists(output_mkv);
using(var vstrm_src=await OpenReadAsync(videoSrc))
{
long len = vstrm_src.Length;
using(var vstrm_dest = File.Create(video_bin))
{
Console.WriteLine("Opening vstream");
if(!await CopyStreamAsync(vstrm_src,vstrm_dest,0,len,4096,
new Progress<double>((e)=>{
if(progress !=null)
{
progress.Report(e/4);
}
})
,token
))
{
goto end;
}
}
}
using(var astrm_src=await OpenReadAsync(audioSrc))
{
using(var astrm_dest = File.Create(audio_bin))
{
Console.WriteLine("opening astream");
if(!await CopyStreamAsync(astrm_src,astrm_dest,0,astrm_src.Length,4096,
new Progress<double>((e)=>{
if(progress !=null)
{
progress.Report(e/4+0.25);
}
})
,token
))
{
goto end;
}
}
}
string videoFile=Path.Combine("TYTD_TEMP","video.bin");
string audioFile=Path.Combine("TYTD_TEMP","audio.bin");
string outFile = Path.Combine("TYTD_TEMP","output.mkv");
ret=await Convert(video,videoFile,audioFile,outFile,token,new Progress<string>((e)=>{
// time=\"\"
if(progress!=null)
{
var progr=get_percent(e).TotalSeconds / video.Duration.TotalSeconds;
progress.Report(progr / 4 + 0.50);
}
}),FFmpeg);
if(ret)
{
using(var mstrm_src=File.OpenRead(output_mkv))
{
using(var mstrm_dest=await CreateAsync(videoDest))
{
ret=await CopyStreamAsync(mstrm_src,mstrm_dest,0,mstrm_src.Length,4096,new Progress<double>((e)=>{
if(progress!=null)
{
progress.Report(e / 4 + 0.75);
}
}),token);
}
}
}
end:
Directory.Delete("TYTD_TEMP",true);
return ret;
}
private async Task DownloadVideoMuxedAsync(SavedVideo video,CancellationToken token,IProgress<double> progress,bool report=true)
{
bool isValid=true;
isValid=await DownloadVideoOnlyAsync(video,token,progress,report);
if(token.IsCancellationRequested || !isValid || cancelDownload || restartDownload)
{
return;
}
isValid = await DownloadAudioOnlyAsync(video,token,progress,report);
if(token.IsCancellationRequested || !isValid || cancelDownload || restartDownload)
{
return;
}
var streams=await BestStreamInfo.GetBestStreams(this,video.Id,token,false);
if(token.IsCancellationRequested || cancelDownload || restartDownload)
{
return;
}
if(report)
await ReportStartVideo(video,Resolution.Mux,0);
string complete = $"Muxed/{video.Id}.mkv";
string incomplete = $"Muxed/{video.Id}incomplete.mkv";
string complete_vidonly = $"VideoOnly/{video.Id}.{streams.VideoOnlyStreamInfo.Container}";
string complete_audonly = $"AudioOnly/{video.Id}.{streams.AudioOnlyStreamInfo.Container}";
if(await Continue(complete))
{
if(await MuxVideosAsync(video,complete_vidonly,complete_audonly,incomplete,progress,token))
{
RenameFile(incomplete,complete);
}
}
if(report)
await ReportEndVideo(video,Resolution.Mux);
}
private void DeleteIfExists(string path)
{
if(File.Exists(path))
{
File.Delete(path);
}
}
public async Task<bool> DownloadVideoOnlyAsync(SavedVideo video,CancellationToken token,IProgress<double> progress,bool report=true)
{
currentVideoCancelSource = new CancellationTokenSource();
token.Register(()=>{
currentVideoCancelSource.Cancel();
});
bool ret=false;
var streams = await BestStreamInfo.GetBestStreams(this, video.Id, currentVideoCancelSource.Token, false);
if(streams != null)
{
if(streams.VideoFrozen)
{
throw new Exception($"[TYTD Specific Error] Video is frozen, we wont do anything with the video.\nplease set \"VideoFrozen\": false in the file \"Info/{video.Id}.json\" to fix this problem");
}
await MoveLegacyStreams(video,streams);
string complete = $"VideoOnly/{video.Id}.{streams.VideoOnlyStreamInfo.Container}";
string incomplete = $"VideoOnly/{video.Id}incomplete.{streams.VideoOnlyStreamInfo.Container}";
if(await Continue(complete))
{
if(!can_download) return false;
streams = await BestStreamInfo.GetBestStreams(this,video.Id,currentVideoCancelSource.Token);
if(streams != null)
{
currentVideoCancelSource.CancelAfter(streams.TillExpire - new TimeSpan(0,5,0));
using(var strm = await YoutubeClient.Videos.Streams.GetAsync(streams.VideoOnlyStreamInfo,currentVideoCancelSource.Token))
{
if(token.IsCancellationRequested || cancelDownload || restartDownload)
{
return false;
}
if(report)
await ReportStartVideo(video, Resolution.VideoOnly,streams.VideoOnlyStreamInfo.Size.Bytes);
using(var dest = await OpenOrCreateAsync(incomplete))
{
ret=await CopyStreamAsync(strm,dest,dest.Length,streams.VideoOnlyStreamInfo.Size.Bytes,4096,progress,currentVideoCancelSource.Token);
currentVideoCancelSource.Dispose();
currentVideoCancelSource=null;
}
if(ret)
{
RenameFile(incomplete,complete);
if(report)
await ReportEndVideo(video, Resolution.VideoOnly);
}
}
}
}else{
ret=true;
}
}
//We know its resolution
return ret;
}
private async Task MoveLegacyStream(string src,string dest)
{
if(src.Equals(dest))
return;
if(!await Continue(dest))
return;
if(!await FileExistsAsync(src))
return;
RenameFile(src,dest);
}
public async Task MoveLegacyStreams(SavedVideo video,BestStreams streams)
{
if(video.VideoFrozen) return;
if(video.LegacyVideo)
{
string legacyVideoOnlyComplete = $"VideoOnly/{video.Id}.mp4";
string legacyAudioOnlyComplete = $"AudioOnly/{video.Id}.mp4";
string legacyPreMuxedComplete = $"PreMuxed/{video.Id}.mp4";
string modernVideoOnlyComplete = $"VideoOnly/{video.Id}.{streams.VideoOnlyStreamInfo.Container}";
string modernAudioOnlyComplete = $"AudioOnly/{video.Id}.{streams.AudioOnlyStreamInfo.Container}";
string modernPreMuxedComplete = $"PreMuxed/{video.Id}.{streams.MuxedStreamInfo}";
string legacyVideoOnlyInComplete = $"VideoOnly/{video.Id}incomplete.mp4";
string legacyAudioOnlyInComplete = $"AudioOnly/{video.Id}incomplete.mp4";
string legacyPreMuxedInComplete = $"PreMuxed/{video.Id}incomplete.mp4";
string modernVideoOnlyInComplete = $"VideoOnly/{video.Id}incomplete.{streams.VideoOnlyStreamInfo.Container}";
string modernAudioOnlyInComplete = $"AudioOnly/{video.Id}incomplete.{streams.AudioOnlyStreamInfo.Container}";
string modernPreMuxedInComplete = $"PreMuxed/{video.Id}incomplete.{streams.MuxedStreamInfo}";
await MoveLegacyStream(legacyVideoOnlyComplete,modernVideoOnlyComplete);
await MoveLegacyStream(legacyAudioOnlyComplete,modernAudioOnlyComplete);
await MoveLegacyStream(legacyPreMuxedComplete,modernPreMuxedComplete);
await MoveLegacyStream(legacyVideoOnlyInComplete,modernVideoOnlyInComplete);
await MoveLegacyStream(legacyAudioOnlyInComplete,modernAudioOnlyInComplete);
await MoveLegacyStream(legacyPreMuxedInComplete,modernPreMuxedInComplete);
video.LegacyVideo=false;
await WriteAllTextAsync($"Info/{video.Id}.json",JsonConvert.SerializeObject(video));
}
}
private async Task<bool> DownloadAudioOnlyAsync(SavedVideo video,CancellationToken token,IProgress<double> progress,bool report=true)
{
currentVideoCancelSource = new CancellationTokenSource();
token.Register(()=>{
currentVideoCancelSource.Cancel();
});
bool ret=false;
var streams = await BestStreamInfo.GetBestStreams(this, video.Id, token, false);
if(streams != null)
{
if(streams.VideoFrozen)
{
throw new Exception($"[TYTD Specific Error] Video is frozen, we wont do anything with the video.\nplease set \"VideoFrozen\": false in the file \"Info/{video.Id}.json\" to fix this problem");
}
string complete = $"AudioOnly/{video.Id}.{streams.AudioOnlyStreamInfo.Container}";
string incomplete = $"AudioOnly/{video.Id}incomplete.{streams.AudioOnlyStreamInfo.Container}";
await MoveLegacyStreams(video,streams);
if(await Continue(complete))
{
if(!can_download) return false;
streams = await BestStreamInfo.GetBestStreams(this,video.Id,currentVideoCancelSource.Token);
if(streams != null)
{
currentVideoCancelSource.CancelAfter(streams.TillExpire - new TimeSpan(0,5,0));
using(var strm = await YoutubeClient.Videos.Streams.GetAsync(streams.AudioOnlyStreamInfo,currentVideoCancelSource.Token))
{
if(token.IsCancellationRequested || cancelDownload || restartDownload)
{
return false;
}
if(report)
await ReportStartVideo(video, Resolution.AudioOnly,streams.AudioOnlyStreamInfo.Size.Bytes);
using(var dest = await OpenOrCreateAsync(incomplete))
{
ret=await CopyStreamAsync(strm,dest,dest.Length,streams.AudioOnlyStreamInfo.Size.Bytes,4096,progress,currentVideoCancelSource.Token);
currentVideoCancelSource.Dispose();
currentVideoCancelSource=null;
}
if(ret)
{
RenameFile(incomplete,complete);
if(report)
await ReportEndVideo(video, Resolution.AudioOnly);
}
}
}
}else{
ret=true;
}
}
//We know its resolution
return ret;
}
private async Task DownloadPreMuxedVideoAsync(SavedVideo video, CancellationToken token,IProgress<double> progress,bool report=true)
{
currentVideoCancelSource = new CancellationTokenSource();
token.Register(()=>{
currentVideoCancelSource.Cancel();
});
var streams = await BestStreamInfo.GetBestStreams(this, video.Id, currentVideoCancelSource.Token, false);
if(!can_download) return;
if(streams != null)
{
if(streams.VideoFrozen)
{
throw new Exception($"[TYTD Specific Error] Video is frozen, we wont do anything with the video.\nplease set \"VideoFrozen\": false in the file \"Info/{video.Id}.json\" to fix this problem");
}
await MoveLegacyStreams(video,streams);
string complete = $"PreMuxed/{video.Id}.{streams.MuxedStreamInfo.Container}";
string incomplete = $"PreMuxed/{video.Id}incomplete.{streams.MuxedStreamInfo.Container}";
if(await Continue(complete))
{
streams = await BestStreamInfo.GetBestStreams(this,video.Id,currentVideoCancelSource.Token);
if(streams != null)
{
currentVideoCancelSource.CancelAfter(streams.TillExpire - new TimeSpan(0,5,0));
using(var strm = await YoutubeClient.Videos.Streams.GetAsync(streams.MuxedStreamInfo,currentVideoCancelSource.Token))
{
if(token.IsCancellationRequested || cancelDownload || restartDownload)
{
return;
}
if(report)
await ReportStartVideo(video,Resolution.PreMuxed,streams.MuxedStreamInfo.Size.Bytes);
bool ret;
using(var dest = await OpenOrCreateAsync(incomplete))
{
ret=await CopyStreamAsync(strm,dest,dest.Length,streams.MuxedStreamInfo.Size.Bytes,4096,progress,currentVideoCancelSource.Token);
currentVideoCancelSource.Dispose();
currentVideoCancelSource=null;
}
//We know its resolution
if(ret)
{
RenameFile(incomplete,complete);
if(report)
await ReportEndVideo(video, Resolution.PreMuxed);
}
}
}
}
}
}
private (SavedVideo video, Resolution resolution) Dequeue(out bool hasAny)
{
SavedVideo video;
Resolution resolution;
hasAny = false;
lock (QueueList)
{
if (QueueList.Count > 0)
{
(video, resolution) = QueueList[QueueList.Count - 1];
hasAny = true;
QueueList.RemoveAt(QueueList.Count - 1);
}
else
{
video = null;
resolution = Resolution.PreMuxed;
}
}
return (video, resolution);
}
}
}