private static IEnumerable <IStreamInfo> GetBestMediaStreamInfos(
StreamManifest streamManifest,
ConversionFormat format)
{
// Fail if there are no available streams
if (!streamManifest.Streams.Any())
{
throw new ArgumentException("There are no streams available.", nameof(streamManifest));
}
// Use single muxed stream if adaptive streams are not available
if (!streamManifest.GetAudioOnly().Any() || !streamManifest.GetVideoOnly().Any())
{
// Priority: video quality -> transcoding
yield return(streamManifest
.GetMuxed()
.OrderByDescending(s => s.VideoQuality)
.ThenByDescending(s => !IsTranscodingRequired(s.Container, format))
.First());
yield break;
}
// Include audio stream
// Priority: transcoding -> bitrate
yield return(streamManifest
.GetAudioOnly()
.OrderByDescending(s => !IsTranscodingRequired(s.Container, format))
.ThenByDescending(s => s.Bitrate)
.First());
// Include video stream
if (!format.IsAudioOnly)
{
// Priority: video quality -> framerate -> transcoding
yield return(streamManifest
.GetVideoOnly()
.OrderByDescending(s => s.VideoQuality)
.ThenByDescending(s => s.Framerate)
.ThenByDescending(s => !IsTranscodingRequired(s.Container, format))
.First());
}
}
private static bool IsTranscodingRequired(Container container, ConversionFormat format) => !string.Equals(container.Name, format.Name, StringComparison.OrdinalIgnoreCase);