c# - Ffmpeg 在解码时卡住

Question

FFmpeg 在解码一个小的 mp3 文件时卡住。在处理大约 8 或 9 个数据缓冲区后，崩溃总是发生。我不知道发生了什么。

           await e.Channel.SendMessage("Playing");
            var server = e.Server;
            var voiceChannel = client.FindServers(server.Name).FirstOrDefault().VoiceChannels.FirstOrDefault();
            var _vClient = await client.GetService<AudioService>()
                .Join(voiceChannel);

            var pathOrUrl = "a.mp3";

            var process = Process.Start(new ProcessStartInfo
            { // FFmpeg requires us to spawn a process and hook into its stdout, so we will create a Process
                FileName = "ffmpeg",
                Arguments = $"-i {pathOrUrl} " + // Here we provide a list of arguments to feed into FFmpeg. -i means the location of the file/URL it will read from
                            "-f s16le -ar 48000 -ac 1 pipe:1", // Next, we tell it to output 16-bit 48000Hz PCM, over 2 channels, to stdout.
                UseShellExecute = false,
                RedirectStandardOutput = true // Capture the stdout of the process
            });
            Thread.Sleep(2000); // Sleep for a few seconds to FFmpeg can start processing data.

            int blockSize = 3840; // The size of bytes to read per frame; 1920 for mono
            byte[] buffer = new byte[blockSize];
            int byteCount;

            while (true) // Loop forever, so data will always be read
            {
                byteCount = process.StandardOutput.BaseStream // Access the underlying MemoryStream from the stdout of FFmpeg
                        .Read(buffer, 0, blockSize); // Read stdout into the buffer

                if (byteCount == 0) { // FFmpeg did not output anything
                    Console.WriteLine("Finished");
                    break;
                    }// Break out of the while(true) loop, since there was nothing to read.

                _vClient.Send(buffer, 0, byteCount); // Send our data to Discord
            }
            _vClient.Wait();

Answer 1

你的论点:

-f s16le -ar 48000 -ac 1 pipe:1

这些是我用来转换 mp3 的参数:

-acodec libmp3lame -ar 48000 -ac 2 -map 0:a:0?

我相信-ac 1是单声道和 -ac 2是立体声的
https://trac.ffmpeg.org/wiki/AudioChannelManipulation#monostereo

当我将您的参数与 -f s16le 一起使用时转换一个 mp3，文件出来损坏和静音。如果排除它，我认为它仍然会自动转换为 16 位。

你也可以试试:

-f pcm_s16le

也许这些细节会引导你解决问题。