MP4 Encoding using ASP.NET
ASP.NET Video Converter can be used to encode any format video to high-quality mp4 video and audio file, add meta information to prepare it for web streaming, and make it compatible to be played on different devices and players including HTML5 and Flash.
This topic will provide detailed sample codes that can help you publish high-quality mp4 videos using libx264 preset files and add meta information to stream properly on the web.
C# Sample Code
The sample code below will generate mp4 video using libx264 codec and libx264-baseline.ffpreset preset file. You can use other preset files to generate mp4 video for iPod, iPhone, or high definition for computers.
var_mhandler = new MediaHandler();
var RootPath = Server.MapPath(Request.ApplicationPath);
_mhandler.FFMPEGPath = HttpContext.Current.Server.MapPath("~\\ffmpeg\\ffmpeg.exe");
_mhandler.InputPath = RootPath + "\\contents\\original";
_mhandler.OutputPath = RootPath + "\\contents\\mp4";
_mhandler.FileName = "Wildlife.wmv";
var presetpath = RootPath + "\\ffmpeg\\presets\\libx264-baseline.ffpreset";
_mhandler.OutputExtension = ".mp4";
_mhandler.OutputFileName = "canon_temp";
_mhandler.VCodec = "libx264";
_mhandler.Parameters = " -s 320x240 -fpre " + presetpath + "";
_mhandler.Video_Bitrate = 500;
_mhandler.Channel = 2;
_mhandler.Audio_SamplingRate = 48000;
_mhandler.Audio_Bitrate = 192;
_mhandler.FrameRate = 25;
VideoInfo info = _mhandler.Process(); // start encoding mp4 video via process method
Validation Check: This check will make sure whether video is successfully published or failed due to any reason returned through error code.
if (info.ErrorCode > 0)
{
Response.Write("Video processing failed, Error code " + info.ErrorCode + " generated");
Response.Write(info.FFMPEGOutput);
return;
}
Add Meta Information to Mp4 Video
Once the mp4 video published, it still has lack streaming on the web. In order to stream it properly, you must add meta information to the mp4 video to make it streamable and buffering properly.
For adding meta information and make it streamable mp4 video, we used mp4box utility with asp.net media handler pro.
var _mp4_org_path = "\"" + _mhandler.OutputPath + "\\canon_temp.mp4\"";
// Set mp4box path
_mhandler.MP4BoxPath = RootPath + "\\mp4box\\mp4box.exe";
// Prepare mp4box meta information parameters
_mhandler.Parameters = "-isma -hint -add " + _mp4_org_path + "";
// Set final mp4 video path
_mhandler.FileName = "Sample_Final.mp4";
// Set path of folder where final mp4 video will store
_mhandler.InputPath = _mhandler.OutputPath;
// Start mp4 meta information process
_mhandler.Set_MP4_Buffering();
Complete Code
Sample code shown below will publish mp4 video and set meta information for mp4 video in one step.
Two steps involve in publishing and setting meta information.
- Publish mp4 video as temp video e.g sample_temp.mp4
- Generate streameable mp4 video from temp mp4 video.
- Delete temp mp4 video.
var _mhandler = new MediaHandler();
var RootPath = Server.MapPath(Request.ApplicationPath);
_mhandler.FFMPEGPath = HttpContext.Current.Server.MapPath("~\\ffmpeg\\ffmpeg.exe");
_mhandler.InputPath = RootPath + "\\contents\\original";
_mhandler.OutputPath = RootPath + "\\contents\\mp4";
_mhandler.FileName = "Wildlife.wmv";
var presetpath = RootPath + "\\ffmpeg\\presets\\libx264-baseline.ffpreset";
_mhandler.OutputExtension = ".mp4";
_mhandler.OutputFileName = "canon_temp";
_mhandler.VCodec = "libx264";
_mhandler.Parameters = " -s 320x240 -fpre " + presetpath + "";
_mhandler.Video_Bitrate = 500;
_mhandler.Channel = 2;
_mhandler.Audio_SamplingRate = 48000;
_mhandler.Audio_Bitrate = 192;
_mhandler.FrameRate = 25;
VideoInfo info = _mhandler.Process(); // start encoding mp4 video via process method
// set meta information for mp4 video
string _mp4_org_path = "\"" + _mhandler.OutputPath + "\\canon_temp.mp4\"";
// Set mp4box path
_mhandler.MP4BoxPath = RootPath + "\\mp4box\\mp4box.exe";
// Prepare mp4box meta information parameters
_mhandler.Parameters = "-isma -hint -add " + _mp4_org_path + "";
// Set final mp4 video path
_mhandler.FileName = "Sample_Final.mp4";
// Set path of folder where final mp4 video will store
_mhandler.InputPath = _mhandler.OutputPath;
// Start mp4 meta information process
_mhandler.Set_MP4_Buffering();
// delete temp mp4 video
if (System.IO.File.Exists(temp_mp4_path))
System.IO.File.Delete(temp_mp4_path);
// retrieve valudes
if (info.ErrorCode > 0) {
Response.Write("Video processing failed, Error code " + info.ErrorCode + " generated");
Response.Write(info.FFMPEGOutput);
return;
}Retrieve Information From Video
Once published asp.net media handler pro will returned source and published video information as VideoInfo object. Sample information shown below
var str = new StringBuilder();
str.Append("File Name= " + info.FileName + "<br />");
str.Append("Video Duration= " + info.Duration + "<br />");
str.Append("Video Duration in Seconds= " + info.Duration_Sec + "<br />");
// Input values str.Append("Input Values + "<br />");
str.Append("Video Codec= " + info.Input_Vcodec + "<br />");
str.Append("Audio Codec= " + info.Input_Acodec + "<br />");
str.Append("Video Bitrate= " + info.Input_Video_Bitrate + "<br />");
str.Append("Audio Bitrate= " + info.Input_Audio_Bitrate + "<br />");
str.Append("Audio Sampling Rate= " + info.Input_SamplingRate + "<br />");
str.Append("Audio Channel= " + info.Input_Channel + "<br />");
str.Append("Width= " + info.Input_Width + "<br />");
str.Append("Height= " + info.Input_Height + "<br />");
str.Append("Video FrameRate= " + info.Input_FrameRate + "<br />");
// Output values str.Append("Output Values + "<br />");
str.Append("Video Codec= " + info.Vcodec + "<br />");
str.Append("Audio Codec= " + info.Acodec + "<br />");
str.Append("Video Bitrate= " + info.Video_Bitrate + "<br />");
str.Append("Audio Bitrate= " + info.Audio_Bitrate + "<br />");
str.Append("Audio Sampling Rate= " + info.SamplingRate + "<br />");
str.Append("Audio Channel= " + info.Channel + "<br />");
str.Append("Width= " + info.Width + "<br />");
str.Append("Height= " + info.Height + "<br />");
str.Append("Video FrameRate= " + info.FrameRate + "<br />");
str.Append(".................................+ "<br />");
str.Append("FFMPEG Output:" + info.FFMPEGOutput + "<br />");
str.Append("Error Code= " + info.ErrorCode + "<br />");
Response.Write(str.ToString());