LiveStreamRecorderMP4 and MP4 metadata?

Wowza Streaming Engine
1

Is there a way to write additional metadata fields to the header of the .mp4 file produced? I’d like to set the episode-id (TVEN) atom when recording.

Thanks,

Jeremy

2

Hi, Jeremy,

This method to inject metadata in the live stream should work. The metadata should record.

Richard

3

Jeremy,

I’ve been testing this and also do not find metadata injected into the live stream in the recording of the live stream. I will have to get back to you.

Richard

4

Okay, so I have the following in my streaming module after recorder.startRecording(stream, outputFile, false):

		// attempt to inject an episode ID
		AMFDataList amfList = new AMFDataList();
		
		amfList.add(new AMFDataItem("@setDataFrame"));
		amfList.add(new AMFDataItem("onMetaData"));
		
		AMFDataMixedArray metaData = new AMFDataMixedArray();
		
		metaData.put("tven", new AMFDataItem("XX test episode ID"));
		metaData.put("param2", new AMFDataItem("data2"));
		amfList.add(metaData);
				
		synchronized(stream)
	    {
			byte[] dataData = amfList.serialize();
			int size = dataData.length;
            long timecode = Math.max(stream.getAudioTC(), stream.getVideoTC());
            stream.setDataTC(timecode);
            stream.setDataSize(size);
            stream.startDataPacket();
            stream.addDataData(dataData, 0, size);
	    }

However, the resulting .mp4 file doesn’t contain any additional data, as reported by ffmpeg:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'c:\temp\Exam1 2014-02-24 09.35.56.mp4':
  Metadata:
    major_brand     : f4v
    minor_version   : 0
    compatible_brands: isommp42m4v
    creation_time   : 2014-02-24 14:35:56
  Duration: 00:13:57.92, start: 0.000000, bitrate: 5283 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1920x
1080 [SAR 1:1 DAR 16:9], 5149 kb/s, 60 fps, 60 tbr, 90k tbn, 120 tbc
    Metadata:
      creation_time   : 2014-02-24 14:35:56
      handler_name    : WowzaMediaServerPro
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 12
5 kb/s
    Metadata:
      creation_time   : 2014-02-24 14:35:56
      handler_name    : WowzaMediaServerPro

How can I inject metadata that will be written to the mp4 file?

Edit: also checked with a hex editor, and the strings written out don’t appear anywhere in the mp4 file, so it’s not just a matter of ffmpeg not reading them.

5

Hi,

are there any news on that? I guess I have the same problem.

Current Setup:

Streaming webcam from FlashPlayer (web) to Wowza-server and recording it there.

Generating Metadata (title / description) via FlashPlayer / Netstream.Send

I verified that the metadata is delivered to and recognized by Wowza-Server:

byte[] data = metaDataPacket.getData();
AMFDataList metaDataList = new AMFDataList(data);
logger.info("StreamListener '" + stream.getName() + "' | onMetaData: "+metaDataList.toString());

INFO server comment - StreamListener 'video-1409042059-1785536785' | onMetaData: 
{Obj[]: description: "Eine Beschreibung", caption: "Test-Caption", title: "Ein Titel"}

Also, when I use FLV instead of H264-Encoding in Flash, i get the metadata perfectly recorded.

But this is no option since FLV is poor quality with big file sizes.

I did not try different H264-Settings in Flash.

But this seems no problem since the metadata is passed to the server and can be decoded there.

Here are my H264-Settings if they do matter:

ActionScript:

var h264Settings:H264VideoStreamSettings = new H264VideoStreamSettings();
h264Settings.setProfileLevel(H264Profile.BASELINE, H264Level.LEVEL_3);
netStream.videoStreamSettings = h264Settings;

thanks for reading.