diff options
Diffstat (limited to 'MediaBrowser.MediaEncoding/Subtitles')
| -rw-r--r-- | MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs | 102 |
1 files changed, 97 insertions, 5 deletions
diff --git a/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs b/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs index 77aadee704..67e323177b 100644 --- a/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs +++ b/MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs @@ -214,7 +214,8 @@ namespace MediaBrowser.MediaEncoding.Subtitles }; } - var currentFormat = (Path.GetExtension(subtitleStream.Path) ?? subtitleStream.Codec).TrimStart('.'); + // Normalize ffmpeg codec names to the file extensions the parser is keyed on + var currentFormat = NormalizeCodecToParserExtension((Path.GetExtension(subtitleStream.Path) ?? subtitleStream.Codec).TrimStart('.')); // Handle PGS subtitles as raw streams for the client to render if (MediaStream.IsPgsFormat(currentFormat)) @@ -324,13 +325,91 @@ namespace MediaBrowser.MediaEncoding.Subtitles { using (await _semaphoreLocks.LockAsync(outputPath, cancellationToken).ConfigureAwait(false)) { - if (!File.Exists(outputPath) || _fileSystem.GetFileInfo(outputPath).Length == 0) + if (!IsCachedSubtitleFresh(outputPath, subtitleStream.Path)) { await ConvertTextSubtitleToSrtInternal(subtitleStream, mediaSource, outputPath, cancellationToken).ConfigureAwait(false); } } } + // ffmpeg codec names don't always match the file extensions the subtitle parser is keyed on. + private static string NormalizeCodecToParserExtension(string codecOrExtension) + { + return codecOrExtension switch + { + "subrip" => "srt", + "webvtt" => "vtt", + _ => codecOrExtension + }; + } + + // Records "this cache was built from this exact source revision" in a sidecar file next to the cache: "<sizeBytes>:<mtimeTicks>" + private static string GetCacheMetaPath(string cachePath) => cachePath + ".meta"; + + private static string FormatCacheMeta(long length, DateTime lastWriteUtc) + => string.Create(CultureInfo.InvariantCulture, $"{length}:{lastWriteUtc.Ticks}"); + + private bool IsCachedSubtitleFresh(string cachePath, string? sourcePath) + { + if (!File.Exists(cachePath)) + { + return false; + } + + var cacheInfo = _fileSystem.GetFileInfo(cachePath); + if (cacheInfo.Length == 0) + { + return false; + } + + if (string.IsNullOrEmpty(sourcePath) || !File.Exists(sourcePath)) + { + return true; + } + + var metaPath = GetCacheMetaPath(cachePath); + if (!File.Exists(metaPath)) + { + // Pre-existing cache from before metadata tracking - regenerate so we can record the source state. + return false; + } + + try + { + var sourceInfo = _fileSystem.GetFileInfo(sourcePath); + var expected = FormatCacheMeta(sourceInfo.Length, sourceInfo.LastWriteTimeUtc); + var actual = File.ReadAllText(metaPath); + return string.Equals(expected, actual, StringComparison.Ordinal); + } + catch (IOException) + { + return false; + } + } + + private void WriteCacheMeta(string cachePath, string? sourcePath) + { + if (string.IsNullOrEmpty(sourcePath)) + { + return; + } + + try + { + var sourceInfo = _fileSystem.GetFileInfo(sourcePath); + if (!sourceInfo.Exists) + { + return; + } + + File.WriteAllText(GetCacheMetaPath(cachePath), FormatCacheMeta(sourceInfo.Length, sourceInfo.LastWriteTimeUtc)); + } + catch (IOException ex) + { + _logger.LogWarning(ex, "Failed to record subtitle cache metadata for {CachePath}", cachePath); + } + } + /// <summary> /// Converts the text subtitle to SRT internal. /// </summary> @@ -375,7 +454,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles CreateNoWindow = true, UseShellExecute = false, FileName = _mediaEncoder.EncoderPath, - Arguments = string.Format(CultureInfo.InvariantCulture, "{0} -i \"{1}\" -c:s srt \"{2}\"", encodingParam, inputPath, outputPath), + Arguments = string.Format(CultureInfo.InvariantCulture, "-y {0} -i \"{1}\" -c:s srt \"{2}\"", encodingParam, inputPath, outputPath), WindowStyle = ProcessWindowStyle.Hidden, ErrorDialog = false }, @@ -455,6 +534,8 @@ namespace MediaBrowser.MediaEncoding.Subtitles await SetAssFont(outputPath, cancellationToken).ConfigureAwait(false); + WriteCacheMeta(outputPath, inputPath); + _logger.LogInformation("ffmpeg subtitle conversion succeeded for {Path}", inputPath); } @@ -531,7 +612,8 @@ namespace MediaBrowser.MediaEncoding.Subtitles var releaser = await _semaphoreLocks.LockAsync(outputPath, cancellationToken).ConfigureAwait(false); - if (File.Exists(outputPath) && _fileSystem.GetFileInfo(outputPath).Length > 0) + var sourcePath = string.IsNullOrEmpty(subtitleStream.Path) ? mediaSource.Path : subtitleStream.Path; + if (IsCachedSubtitleFresh(outputPath, sourcePath)) { releaser.Dispose(); continue; @@ -588,7 +670,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles var outputPaths = new List<string>(); var args = string.Format( CultureInfo.InvariantCulture, - "-i {0}", + "-y -i {0}", inputPath); foreach (var subtitleStream in subtitleStreams) @@ -628,6 +710,11 @@ namespace MediaBrowser.MediaEncoding.Subtitles } await ExtractSubtitlesForFile(inputPath, args, outputPaths, cancellationToken).ConfigureAwait(false); + + foreach (var outputPath in outputPaths) + { + WriteCacheMeta(outputPath, mksFile); + } } } @@ -683,6 +770,11 @@ namespace MediaBrowser.MediaEncoding.Subtitles if (outputPaths.Count > 0) { await ExtractSubtitlesForFile(inputPath, args, outputPaths, cancellationToken).ConfigureAwait(false); + + foreach (var outputPath in outputPaths) + { + WriteCacheMeta(outputPath, mediaSource.Path); + } } } |