/// <summary>
/// Creates an empty FFmpeg format container for encoding.
/// </summary>
/// <param name="path">A output file path. It is used only to guess the container format.</param>
/// <returns>A new instance of the <see cref="OutputContainer"/>.</returns>
/// <remarks>Before you write frames to the container, you must call the <see cref="CreateFile(string)"/> method to create an ouput file.</remarks>
public static OutputContainer Create(string path)
{
MediaToolkit.LoadFFmpeg();
if (!Path.HasExtension(path))
{
throw new ArgumentException("The file path has no extension.");
}
var format = ffmpeg.av_guess_format(null, path, null);
if (format == null)
{
throw new NotSupportedException($"Cannot find a container format for the \"{Path.GetExtension(path)}\" file extension.");
}
var formatContext = ffmpeg.avformat_alloc_context();
formatContext->oformat = format;
return(new OutputContainer(formatContext));
}
/// <summary>
/// Opens a media container and stream codecs from given path.
/// </summary>
/// <param name="path">A path to the multimedia file.</param>
/// <param name="options">The media settings.</param>
/// <returns>A new instance of the <see cref="InputContainer"/> class.</returns>
public static InputContainer LoadFile(string path, MediaOptions options)
{
MediaToolkit.LoadFFmpeg();
var context = ffmpeg.avformat_alloc_context();
options.DemuxerOptions.ApplyFlags(context);
var dict = new FFDictionary(options.DemuxerOptions.PrivateOptions);
var ptr = dict.Pointer;
ffmpeg.avformat_open_input(&context, path, null, &ptr)
.ThrowIfError("An error ocurred while opening the file");
ffmpeg.avformat_find_stream_info(context, null)
.ThrowIfError("Cannot find stream info");
dict.Update(ptr);
var container = new InputContainer(context);
container.OpenStreams(options);
return(container);
}
