Online Video Problems (encoding)
by Darren Henderson on Jun 2, 2011 at 6:37:30 pm
Hi guys, This is my first post on the creative cow forums and I'm hoping that you can help! (Save me getting anymore headaches).
Firstly I've spent the last couple of years creating a website that will teach in depth how to play by ear.
I've mainly spent the last 2 or so years learning about video!
The videos themselves will be from 2 - 12 minutes in length and will be viewed from the members area of my site via Progressive download.
The reason i'm going progressive rather than streaming is that I will have a large number of lessons on the site(starting with about 300) which would cost a fortune if I went through a streaming service!
Before I get to the problems, heres my workflow:
I record the videos with an homemade overhead tripod using a CANON HV30 camcorder.
Im from the Uk, so I record in 1440X1080, anamorphic 25P.
I also record the sound seperate and sync them up seperately however thats another problem altogether!!!
Once ive recorded the vids, I then put them to my pc via premiere pro cs5 as uncommpressed avi files.
I then edit the videos and export them to Quicktime animation files.
Which a 2 minute video is around 13gb.
This is where my problems begin.
I want to beable to offer high quality videos on my website.
Im using Sorenson Squeeze 6 to encode my videos and im using a licenced version of JW Player.
All of the videos are in MP4 (H.264 Codec) format so they will play on ipods, ipads, mac and pc.
Here is the link to my test page, with the problems im having written below :)
1, on most, the videos seem to stop at about 3 seconds in, even though the progress bar shows that the video has loaded past that point.
Any ideas as to why?
2, All the videos on my test page are only 20 seconds in length however still manage to be 1 - 2 Mb long!
(so a 2 minute video could end up being 15 - 20 MB)
Does anyone know what size (around) a high quality MP4 video should be on the web?
Ive bought many training videos from creative cow members in the past and a 7 minute high quality video can be around 3mb!
3, My main problem is that if you look at the piano keys on the main piano at the bottom of each video, the line in between the keys appear to be zig zagged in shape! This seems to be on nearly every video regardless of size!
Can anyone shed some light on this or have a solution?
If anyone can give me advice on any of these issues I would greatly appreciate it :)
Also any advice on best size, etc for video for the web etc.
Also can anyone explain something thats been confusing me for awhile.
In sorenson squeeze both the 360p and 480p presets have the same resolution size! can anyone explain why this is?
Also is 360p 480p etc only for those in the usa? Is it different for those in the UK.
And finally, if you had a look at my video tests, you will notice that the sound is very low.
This was a massive error i made by having my headphones very loud!
When im recording audio, how loud should i have my headphones (im working with audition 3)
When i edit in audition, i edit to around -3 db but when I bring the sound file into premiere pro its volume depends on how loud my headphones are.
Turn them up and the sounds peaks. turn it down and the sound is very low!!!
Should I go by the db bar in audition?
Sorry for all of the questions, and if you managed to read this far without falling asleep, thanks very much :)
Re: Online Video Problems (encoding) by Jeff Greenberg on Jun 4, 2011 at 8:56:31 pm
I had a hard time reading your post. I see you're working with Premiere Pro CS5. I'd suggest capturing from your camera, editing and using Adobe Media Encoder (or Sorenson Squeeze) to output as MP4 h.264. The whole Animation/uncompresed steps can be totally avoided. Regardless of what size your editorial footage is, the h.264 files will be small enough to playback/transfer over the Internet.
"Progressive streaming" is the very common way of handling this from the distribution side (it's similar to what youtube does)
1) I think it has something to do with the player you picked. While it stopped just where you said it would, clicking caused it to replay and worked. I'd suggest finding the JWplayer forum and asking there.
2) Data rate x # of seconds = file size. So, if your data rate stays the same, a 60 second video should be 2x the size of a 30 second video
A 7 min/3meg file means the data rate is around 133kb/s - very small - maybe okay for a screen capture, but not okay for video.
3) This is because it's scaling down your video from the recorded size (and possibly deinterlacing)
(Now, I'm firing up squeeze to answer those specific qustions)
360p/480p (I'm looking at the MP4 16x9 presets for both)
The 360 is 640x360 and the 480 is 852x480. These have to do with the vertical resolution, and yes, I think they're weighted for NTSC.
it's common to use normalization to get everything at the loudest to -3db - BUT it's doing the peaks AND that would mean NO FURTHER adjustment in Premiere Pro. Yes, you should check the Volume Meter in both Audition and Premiere Pro.