-
1080i/60 audio to 1080i/50 audio
I’m converting a bunch of one hour DVCPROHD programs from 1080i/60 to 1080i/50 in compressor using the 1080i50 DVCPROHD codec that’s listed there with audio pass through.
I have 4 audio tracks and in the FCP 1080i/60 time line have selected 4 tracks mono and assigned each track to their respective channel.
When I do the conversion I get 4 tracks, but track 3, which is a mix minus VO is blank, so obviously I have a problem in my conversion. The other 3 tracks seem to be fine.
Since I have already done several of these could I as a temporary and relatively painless fix copy my 1080i/60 track 3 audio and paste it into my 1080i/50 timeline and will it work?
Also if anyone has any idea why my conversion is dropping the Channel 3 audio i’d be most appreciative.
thx…jw
-
7 Replies
-
On the assumption that your 60i to 50i conversion is real time & not a speed change, the audio from your 60i will sync with the 50i.
Audio is 48khz so frame rates are not an issue as long as real time is maintained.
-
I thought that might be the case, but when I copy the 1080i/60 audio track and paste it on my 1080i/50 timeline it is short by a few seconds and out of sync.
I tried syncing up one segment thinking that everything else should fall into sync, but that wasn’t the case it drifted out in just a few minutes.
thx…jw
Producer/DP, HD series, “Discoveries…America”, “Discoveries…Ireland”, “Discoveries…Spain”,
“Discoveries…Argentina” -
You will need to export the audio track as an aif file. Dropping your NTSC QT file into the sequence is causing your sync drift.
-
I have the same problem with the exported aif file.
Any suggestions?
thx…jw
Producer/DP, HD series, “Discoveries…America”, “Discoveries…Ireland”, “Discoveries…Spain”,
“Discoveries…Argentina” -
Is compressor doing a real time frame rate conversion or a slow down from 60i to 50i? How quickly does the audio drift?
If it is a speed change then the audio needs to be slowed 4%. Doing this properly would involve using external software like MPEX or Pitch & Time on an audio DAW to maintain pitch.
I also have to ask why you are using compressor for this job. If it is a final master for broadcast then you are better using external hardware at a duplication facility to do the conversion which is not only real time & four audio but looks better.
-
We’re using compressor because we were under the impression the end product would be good. Also standards conversion at a post house is extremely expensive (54 hours of material) and the client doesn’t have the budget.
thx…jwProducer/DP, HD series, “Discoveries…America”, “Discoveries…Ireland”, “Discoveries…Spain”,
“Discoveries…Argentina” -
So rushes. I understand the budget issue as I work in docos.
What about the question of frame rate versus speed conversion?
Reply to this Discussion! Login or Sign Up