Search results matching tag 'mpeg4'

Avid export to Sorenson to Qt with MP4 audio plays too fast

swest26 — Thu, 30 Jul 2009 14:18:55 GMT

If I export a uncompressed (I have to do uncompressed because it's xdcam footage) qt movie- then compress it in Sorenson to a qucktime with MPEG4 audio- the audio plays too fast. The quicktime that came from Avid is fine- or appears to be fine- meaning audio plays at the correct speed, I didn't have this problem before I upgraded. If I choose a different audio compresser- like IMA- the audio is fine.

Importing H.264 files from a Flip camera or Kodak Zi6

irena — Fri, 23 Jan 2009 10:16:16 GMT

Hi there,

I need to double check whether Avid Media Composer will be able to handle files that come from the mini video cameras - like the Flip Mino, Flip Mino HD or the Kodak Zi6, as I have Avid on order, and am deciding which camera to buy.

Here are the formats Flip and Kodak say it records in:

Flip Mino HD
H.264 video compression, AAC audio compression, MP4 file format

Flip Mino
Advanced Profile MPEG-4 AVI

Kodak Zi6
H.264 (MOV), AAC LC

Has anyone ever tried importing and editing files from these cameras before? Can anyone see that I might have any problems doing this?

My Avid Media Composer is on order and arrives next week... the guy setting it up says if I can find some files that have been recorded by these cameras he will try importing them to see if it works. Does anyone have a Flip or Kodak - do you know where I can find some test files?

Uploading High Quality Video: For YouTube

malefunktion — Wed, 24 Sep 2008 18:53:46 GMT

This is a guide for getting high quality material from your Avid timeline, into MPEG Streamclip and then finally on to YouTube so that you can make use of their recent "High Quality" feature.

It is my first ever video tutorial and runs for 18mins encompassing the whole process.

Take the time to pause the guide when asked, and read the slides/stills prior to the video section. They do contain relevant information.

Encoding High Quality Video: For YouTube

malefunktion — Wed, 24 Sep 2008 17:33:53 GMT

This is a guide for getting high quality material from your Avid timeline, into MPEG Streamclip and then finally on to YouTube so that you can make use of their "Watch In High Quality" feature.

Take the time to pause the guide and read each of the slides/stills prior to the video section as they do contain relevant information.

Addendum/Update (27-11-08):

Widescreen YouTube?

YouTube have recently introduced a 16:9 video player on their pages. This has brought a couple of pros and cons.

The main advantage is that native 16:9 material (640x360 / 854x480 etc...) now looks much better without letterboxing. Also, 16:9 material in 720p can now be uploaded and accessed as stated below.

The big disadvantage is that the "Watch in High Quality" link which worked brilliantly in the old 4:3 player, doesn't look all that great in the new 640x360 frame.

Videos uploaded in appropriate 640x360, 854x480, or 1024x576 sizes are compressed by YouTube down to 480x270 (which was fine in their old 480x360 player) and then resized during playback to fit the new 16:9 640x360 frame. This resizing process now blurs all encodes.

The only exception to this rule is if you upload 720p material 1280x720 with a good bitrate of around 5000Kb/s. If you upload this sort of file, you'll be able to access SUPER-CRISP 720p material by appending the video's URL link with &fmt=22.

Addendum/Update (25-11-08):

H264 vs MPEG4 Compressors & 720P HD?

You can safely use EITHER the Apple MPEG4 or H264 compressors to ensure the best possible visual quality you can manage (Adding now that you need to DE-SELECT B-Frames if using H264 compression).

It appears, as of 25-11-08 that YouTube now use a default 16:9 video player. This new player is a 640x360 size, so make sure any 16:9 material meets this resolution. 4:3 material retains its ratio but will pillarbox (and in some cases, letter box slightly below).

For adventurous types, you can upload 720p HD material and YouTube will recompress a 720p version (though not make it visually available by default as yet - you have to paste &fmt=22 into the video's URL).

Should you wish to "future proof" any HD material on YouTube, use these settings:

Compressor: H264 - Select Multipass & De-select B-Frames
Frame Size: 1280x720 (Better downscaling ON if sourcing from 1080i or 1080p footage)
Bitrate: Between 4000 & 6000Kb/s should work. (I've yet to confirm anything other than 5000Kb/s which I have tested.)

Uploading 720p suitable material direct to YouTube will ensure that any and all versions they currently create, will successfully be made, whilst preserving material for any future YouTube 720p default playback.

The Guide:

If the community video embedding feature is not working, you won't see the tutorial here. You will instead have to visit the dedicated Videos section to view it.

(Please visit the site to view this media)

You can also find the guide (split into two parts) on YouTube in *cough* High Quality - here.

You can also see examples of standard HQ YouTube material embedded in a personal web page - here.

You can also view a 720p HD YouTube video embedded in another personal web page - here.