public async Task <string> PrependIntroAsync(CloudBlockBlob outputBlob, string introLocation,
string incomingFile, ILogger log)
{
var localIntro = "";
var localIncoming = "";
var localConcat = "";
try
{
localIntro = await Utils.DownloadToLocalFileAsync(introLocation);
localIncoming = await Utils.DownloadToLocalFileAsync(incomingFile);
localConcat = Utils.CreateLocalConcat(localIntro, localIncoming);
var transcodeParams = new TranscodeParams
{
OutputExtension = ".mp4",
InputFile = incomingFile,
FfmpegParams = $"-f concat -safe 0 -i \"{localConcat}\" -codec copy "
//InputFile = $"concat:{introLocation}|{incomingFile}", // doesn't work with Uris
//FfmpegParams = "-codec copy"
//InputFile = introLocation,
//FfmpegParams = $"-i \"{incomingFile}\" -filter_complex \"[0:0] [0:1] [1:0] [1:1] concat=n=2:v=1:a=1 [v] [a]\" -map \"[v]\" -map \"[a]\""
};
return(await Utils.TranscodeAndUpload(transcodeParams, outputBlob, log));
}
finally
{
Utils.TryDeleteFiles(log, localIntro, localIncoming, localConcat);
}
}
public async Task <string> ExtractThumbnailAsync(string incomingFile, CloudBlockBlob outputBlob, ILogger log)
{
var transcodeParams = new TranscodeParams
{
OutputExtension = ".png",
InputFile = incomingFile,
FfmpegParams = "-vf \"thumbnail,scale=640:360\" -frames:v 1"
};
return(await Utils.TranscodeAndUpload(transcodeParams, outputBlob, log));
}
public static async Task <string> TranscodeVideo(
[ActivityTrigger] TranscodeParams transcodeParams,
[Blob("processed/transcoded")] CloudBlobDirectory dir,
TraceWriter log)
{
var outputBlobName = Path.GetFileNameWithoutExtension(transcodeParams.InputFile) +
transcodeParams.OutputExtension;
log.Info($"Transcoding {transcodeParams.InputFile} with params " +
$"{transcodeParams.FfmpegParams} with extension {transcodeParams.OutputExtension}");
var outputBlob = dir.GetBlockBlobReference(outputBlobName);
return(await videoProcessor.TranscodeAsync(transcodeParams, outputBlob, log));
}
public static async Task <string> TranscodeAndUpload(TranscodeParams transcodeParams, ICloudBlob outputBlob, ILogger log)
{
var outputFilePath = Path.Combine(GetTempTranscodeFolder(), $"{Guid.NewGuid()}{transcodeParams.OutputExtension}");
try
{
await FfmpegWrapper.Transcode(transcodeParams.InputFile, transcodeParams.FfmpegParams, outputFilePath, log);
await outputBlob.UploadFromFileAsync(outputFilePath);
}
finally
{
TryDeleteFiles(log, outputFilePath);
}
return(GetReadSas(outputBlob, TimeSpan.FromHours(2)));
}
public async Task <string> TranscodeAsync(TranscodeParams transcodeParams, ICloudBlob outputBlob, TraceWriter log)
{
await Task.Delay(5000); // simulate some work
return($"{Path.GetFileNameWithoutExtension(transcodeParams.InputFile)}{Guid.NewGuid():N}{transcodeParams.OutputExtension}");
}
public async Task <string> TranscodeAsync(TranscodeParams transcodeParams, ICloudBlob outputBlob, ILogger log)
{
return(await Utils.TranscodeAndUpload(transcodeParams, outputBlob, log));
}