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Echo when compressing to f4v

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Paul Cotton
Echo when compressing to f4v
on Oct 8, 2009 at 5:39:59 pm

I'm using Adobe Media Encoder from CS4. When compressing to f4v using vp6 I'm getting a slight echo that sounds gross. This echo persists when I up the bit rates to unreasonably high values, choose mono or stereo, and choose 44khz sample rate. When I compress to flv with the same values the audio sounds great. Any ideas what might be happening and how to resolve it?
Thanks in advance.
Cheers


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Craig Seeman
Re: Echo when compressing to f4v
on Oct 8, 2009 at 8:06:36 pm

[Paul Cotton] " When compressing to f4v using vp6"

Well that in itself is odd. VP6 should be flv. H.264 is f4v.

The above only mentions the video codec yet the issue you have is Audio.
f4v might be MP3 or AAC (on some programs, not sure about Adobe).
flv should be MP3



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Paul Cotton
Re: Echo when compressing to f4v
on Oct 9, 2009 at 3:06:42 am


Yup. Totally correct. That was my compression ignorance talking. f4v is using MainConcept H.264 codec for video and aac for audio. When using flv I have been using mp3. For f4v my options are aac, aac + version 1, aac + version 2. After a little research I believe just the aac, which is the default choice, is adequate for the dialogue in my source video. Any thought on why it might be giving me the echo? My source is a stereo track. I tried compressing to a mono and stereo output with the same echoey results.
Thanks


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Daniel Low
Re: Echo when compressing to f4v
on Oct 9, 2009 at 8:51:05 am

Are you sampling down from 48K to 44K? (What is your source audio format?)

__________________________________________________________________
"There's no chance that the iPhone is going to get any significant market share. No chance."

Steve Ballmer To USA Today: 30 April 2007

"We and Apple are neck and neck and we're chasing the two
other players,"

Steve Ballmer, referring to Nokia and Research in Motion. October 6th 2009


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Paul Cotton
Re: Echo when compressing to f4v
on Oct 9, 2009 at 2:06:25 pm

Yeah. The source video/audio is from an HD video camera. The audio source is 48khz and compression settings are set to sample 44khz. If this is the problem I suppose I could export from Final Cut with the audio set to 44. Any thoughts? Thanks for the help so far.
Cheers


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Daniel Low
Re: Echo when compressing to f4v
on Oct 9, 2009 at 4:14:56 pm

You should always export from FCP using the exact same settings as your sequence/source:

Export Quicktime Movie using 'Sequence settings'

__________________________________________________________________
"There's no chance that the iPhone is going to get any significant market share. No chance."

Steve Ballmer To USA Today: 30 April 2007

"We and Apple are neck and neck and we're chasing the two
other players,"

Steve Ballmer, referring to Nokia and Research in Motion. October 6th 2009


Return to posts index

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