Production tags

[Jayn_Newell]

I was just wondering how people usually add their production tags into their videos. I've been trying to do it with VirtualDubMod, but I can't get the audio streams to match up (current error is saying different block sizes), so any advice either with that or another method would be appreciated.

[Zarxrax]

If you are trying to append two video clips together in virtualdub, then EVERYTHING about the two clips must be the same, except the actual content and the length.

Resolution, framerate, colorspace, audio format... it all needs to be there.

Most likely it sounds like maybe the clip you are appending doesnt have audio, or the audio is in a different format... maybe.

[Jayn_Newell]

I kinda figured that much. But I'm stuck on what to do now. I have no idea what that error message means, and thus no idea how to fix it. It does have an audio stream, and the sampling rates are the same (and video I've already been through, that matches). I just have no idea what a block size is :/

[gangstaj8]

Just create your tags with whatever video editor it is that you're using. Then you won't have to worry about combining two different video streams with VDM.

[Shazzy]

Audio block sizes have been used since audiocassette tapes. If a filesystem stores something in blocks, it means the data has to be stored in uniform chunks. Say a filesystem uses blocks of 1000 bytes. If you have a file that's 5001 bytes, it has to be stored as 6000 bytes, because there is no "1-byte chunk" for that extra 1 byte. The next block up from 5000 is 6000.

In virtualdub, sample-to-block storage is determined by the sample size (dwSampleSize). In audio streams the block size and the sample size are the same. If your AMV's audio is, say, MPEG Layer 3 Stereo 48 kHz, make sure the tag's audio is also exactly in that format.

[Jayn_Newell]

Hmm, good to know.

I did manage to get it in, by adding 5 seconds of silence to the beginning of the mp3 file before muxing it all together.