/media/seagatecentral/Public/Videos/movie (2018)/movie (2018).en.srt: Invalid data found when processing input

2019-04-17 13:23:44.460 Error HttpServer: Error processing request
        *** Error Report ***
        Version: 4.0.2.0
        Command line: /opt/emby-server/system/EmbyServer.dll -programdata /var/lib/emby -ffdetect /opt/emby-server/bin/ffdetect -ffmpeg /opt/emby-server/bin/ffmpeg -ffprobe /opt/emby-server/bin/ffprobe -restartexitcode 3 -updatepackage emby-server-deb_{version}_amd64.deb
        Operating system: Unix 4.15.0.47
        64-Bit OS: True
        64-Bit Process: True
        User Interactive: True
        Processor count: 4
        Program data path: /var/lib/emby
        Application directory: /opt/emby-server/system
        System.Exception: System.Exception: ffmpeg subtitle conversion failed for /media/seagatecentral/Public/Videos/movie (2018)/movie (2018).en.srt
           at Emby.Server.MediaEncoding.Subtitles.SubtitleEncoder.ConvertExternalSubtitleInternal(String inputPath, String language, MediaProtocol inputProtocol, String outputPath, Int64 startTimeTicks, Int64 endTimeTicks, Boolean preserveOriginalTimestamps, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncJobProcessor.ConvertSubtitles(BaseItem item, String temporaryPath, StreamInfo streamInfo, SubtitleStreamInfo subtitleStreamInfo, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncJobProcessor.ConvertSubtitles(BaseItem item, SyncJobItem jobItem, List`1 subtitles, StreamInfo streamInfo, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncJobProcessor.SyncVideo(SyncJobItem jobItem, Video item, User user, Boolean enableConversion, SyncOptions syncOptions, ISyncProvider provider, IProgress`1 progress, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncJobProcessor.ProcessJobItem(SyncJobItem jobItem, Boolean enableConversion, IProgress`1 progress, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncJobProcessor.SyncJobItems(SyncJobItem[] items, Boolean enableConversion, IProgress`1 progress, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncManager.CreateJob(SyncJobRequest request, CancellationToken cancellationToken)
           at Emby.Server.Sync.Api.SyncService.Post(CreateSyncJob request)
           at Emby.Server.Implementations.Services.ServiceExecGeneral.GetTaskResult(Task task)
           at Emby.Server.Implementations.Services.ServiceHandler.ProcessRequestAsync(HttpListenerHost appHost, IRequest httpReq, IResponse httpRes, ILogger logger, String operationName, CancellationToken cancellationToken)
           at Emby.Server.Implementations.HttpServer.HttpListenerHost.RequestHandler(IRequest httpReq, String urlString, String host, String localPath, CancellationToken cancellationToken)
        Source: Emby.Server.MediaEncoding
        TargetSite: Void MoveNext()
           at Emby.Server.MediaEncoding.Subtitles.SubtitleEncoder.ConvertExternalSubtitleInternal(String inputPath, String language, MediaProtocol inputProtocol, String outputPath, Int64 startTimeTicks, Int64 endTimeTicks, Boolean preserveOriginalTimestamps, CancellationToken cancellationToken)
           at Emby.Server.MediaEncoding.Subtitles.SubtitleEncoder.ConvertExternalSubtitle(String inputPath, String language, MediaProtocol inputProtocol, String outputPath, Int64 startTimeTicks, Int64 endTimeTicks, Boolean preserveOriginalTimestamps, CancellationToken cancellationToken)
           at Emby.Server.MediaEncoding.Subtitles.SubtitleEncoder.GetReadableFile(String mediaPath, MediaProtocol mediaSourceProtocol, MediaStream subtitleStream, String outputFormat, Int64 startTimeTicks, Int64 endTimeTicks, Boolean preserveOriginalTimestamps, CancellationToken cancellationToken)
           at Emby.Server.MediaEncoding.Subtitles.SubtitleEncoder.GetSubtitles(BaseItem item, String mediaSourceId, Int32 subtitleStreamIndex, String outputFormat, Int64 startTimeTicks, Int64 endTimeTicks, Boolean preserveOriginalTimestamps, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncJobProcessor.ConvertSubtitles(BaseItem item, String temporaryPath, StreamInfo streamInfo, SubtitleStreamInfo subtitleStreamInfo, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncJobProcessor.ConvertSubtitles(BaseItem item, SyncJobItem jobItem, List`1 subtitles, StreamInfo streamInfo, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncJobProcessor.SyncVideo(SyncJobItem jobItem, Video item, User user, Boolean enableConversion, SyncOptions syncOptions, ISyncProvider provider, IProgress`1 progress, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncJobProcessor.ProcessJobItem(SyncJobItem jobItem, Boolean enableConversion, IProgress`1 progress, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncJobProcessor.SyncJobItems(SyncJobItem[] items, Boolean enableConversion, IProgress`1 progress, CancellationToken cancellationToken)
           at Emby.Server.Sync.SyncManager.CreateJob(SyncJobRequest request, CancellationToken cancellationToken)
           at Emby.Server.Sync.Api.SyncService.Post(CreateSyncJob request)
           at Emby.Server.Implementations.Services.ServiceExecGeneral.GetTaskResult(Task task)
           at Emby.Server.Implementations.Services.ServiceHandler.ProcessRequestAsync(HttpListenerHost appHost, IRequest httpReq, IResponse httpRes, ILogger logger, String operationName, CancellationToken cancellationToken)
           at Emby.Server.Implementations.HttpServer.HttpListenerHost.RequestHandler(IRequest httpReq, String urlString, String host, String localPath, CancellationToken cancellationToken)