Eric White's Blog

I think both deal with the specifics of video and sound. Please take a look at the code I got from PresentationBuilder::CopyRelatedMedia and the definition of DocumentFormat.OpenXml.Packaging.MediaDataPartType.

Since MediaDataPartType doesn’t have mp4 in its enumeration, PowerTools GetMediadataPartTypeFromContentType uses the default value – MediaDataPartType.Wmv – as mp4 media type. That is why mp4 file cannot be played correctly.

I can play my mp4 in my original pptx. I converted my mp4 to .avi file and inserted it in my original pptx. Both .mp4 and .avi can play. After copied version generated, only .avi file can play, but .mp4 gives the error “Codec Unavailable”.

if (temp.DataPart == null)
{
var ct = oldPart.ContentType;
MediaDataPartType mdpt = GetMediadataPartTypeFromContentType(ct);
MediaDataPart newPart = newContentPart.OpenXmlPackage.CreateMediaDataPart(mdpt);
newPart.FeedData(oldPart.GetStream());

private static MediaDataPartType GetMediadataPartTypeFromContentType(string ct)
{
MediaDataPartType mdpt = MediaDataPartType.Wmv;

if (ct == “audio/aiff”)
mdpt = MediaDataPartType.Aiff;
else if (ct == “video/x-ms-asf-plugin”)
mdpt = MediaDataPartType.Asx;
else if (ct == “video/avi”)
mdpt = MediaDataPartType.Avi;
else if (ct == “audio/midi”)
mdpt = MediaDataPartType.Midi;
else if (ct == “audio/mp3”)
mdpt = MediaDataPartType.Mp3;
else if (ct == “audio/mpeg”)
mdpt = MediaDataPartType.MpegAudio;
else if (ct == “audio/mpegurl”)
mdpt = MediaDataPartType.MpegUrl;
else if (ct == “video/mpeg”)
mdpt = MediaDataPartType.MpegVideo;
else if (ct == “video/mpg”)
mdpt = MediaDataPartType.Mpg;
else if (ct == “audio/ogg”)
mdpt = MediaDataPartType.OggAudio;
else if (ct == “video/ogg”)
mdpt = MediaDataPartType.OggVideo;
else if (ct == “video/quicktime”)
mdpt = MediaDataPartType.Quicktime;
else if (ct == “video/vc1”)
mdpt = MediaDataPartType.VC1;
else if (ct == “audio/wav”)
mdpt = MediaDataPartType.Wav;
else if (ct == “audio/x-ms-wma”)
mdpt = MediaDataPartType.Wma;
else if (ct == “video/x-ms-wmv”)
mdpt = MediaDataPartType.Wmv;
else if (ct == “video/x-ms-wmx”)
mdpt = MediaDataPartType.Wmx;
else if (ct == “video/x-ms-wvx”)
mdpt = MediaDataPartType.Wvx;
else if (ct == “audio/unknown”)
mdpt = MediaDataPartType.Wav;
return mdpt;
}

namespace DocumentFormat.OpenXml.Packaging
{
// Summary:
// Defines part media types.
public enum MediaDataPartType
{
// Summary:
// Audio Interchange File Format (.aiff)
Aiff = 0,
//
// Summary:
// MIDI Audio (.mid)
Midi = 1,
//
// Summary:
// MP3 (.mp3)
Mp3 = 2,
//
// Summary:
// MP3 Playlist File (.m3u)
MpegUrl = 3,
//
// Summary:
// WAV audio (.wav)
Wav = 4,
//
// Summary:
// Windows Media Audio File (.wma)
Wma = 5,
//
// Summary:
// Mpeg audio (.mpeg)
MpegAudio = 6,
//
// Summary:
// Ogg Vorbis (.ogg)
OggAudio = 7,
//
// Summary:
// Advanced Stream Redirector File (.asx)
Asx = 8,
//
// Summary:
// Audio Video Interleave File (.avi)
Avi = 9,
//
// Summary:
// MPEG 1 System Stream (.mpg)
Mpg = 10,
//
// Summary:
// MPEG 1 System Stream (.mpeg)
MpegVideo = 11,
//
// Summary:
// Windows Media File (.wmv)
Wmv = 12,
//
// Summary:
// Windows Media Player A/V Shortcut (.wmx)
Wmx = 13,
//
// Summary:
// Windows Media Redirector (.wvx)
Wvx = 14,
//
// Summary:
// QuickTime video (.mov)
Quicktime = 15,
//
// Summary:
// Ogg Stream (.ogg)
OggVideo = 16,
//
// Summary:
// VC-1 Stream (.wmv)
VC1 = 17,
}
}

Ok, I’ll do it tomorrow and let you know.