need to edit audio in my video , can i avoid to render/recode the all video

[rama]

Hi
i have some videos , and i had to edit only the audio inside my videos

for example sync my audio with video , and amplify some part of the audio , and save it

can i avoid to render/recode the all video video & audio?

i'm using right now premiere cc , but maybe there are some free alternative?

thanks

[redwudz]

What format is your video and audio? That would determine what programs you may be able to use.

Some freeware programs like AVIDemux and VirtualDub can mux out audio from some formats,
and programs like Audacity can make adjustments in volume or add filtering to it.
Then you would need to mux it back with the video. You wouldn't need to re-encode the video most times.

[rama]

What format is your video and audio? That would determine what programs you may be able to use.

Some freeware programs like AVIDemux and VirtualDub can mux out audio from some formats,
and programs like Audacity can make adjustments in volume or add filtering to it.
Then you would need to mux it back with the video. You wouldn't need to re-encode the video most times.

hi thanks for the answer !
but for example 1 video is

avi Codec: MPEG-4 Video (XVID)

i like avidemux , but i pay every months for premiere cc (subscrition) , avidemux can do it and premiere cc doesn't?

[smrpix]

avidemux can do it and premiere cc doesn't?

You can use Premiere to edit the audio only -- with frame-accurate precision, but you'll have to remux it in something else if you don't want to reencode the video.

[rama]

avidemux can do it and premiere cc doesn't?

You can use Premiere to edit the audio only -- with frame-accurate precision, but you'll have to remux it in something else if you don't want to reencode the video.

hi
let me make an example

start premiere
import the video
edit the audio only
after what should do ?
save the audio with premiere and use anther tool?

can you make an example please? maybe with some steps by steps premiere + another software to remux it


thanks a lot

ps audition cc can edit the audio only and save the video+the audio edited

[rama]

avidemux can do it and premiere cc doesn't?

You can use Premiere to edit the audio only -- with frame-accurate precision, but you'll have to remux it in something else if you don't want to reencode the video.

hi
i tried yesterday , i exported the audio and i remux it with avidemux last version 64bit
but i got the voice out of sync

thanks

[hech54]

My MAIN USE of AviDemux is to do exactly what you are doing(enhancing audio or replacing audio in a video clip without re-encoding the video). 99% of my clips are MPEG2/DVD clips.

[DJ_ValBec]

avidemux can do it and premiere cc doesn't?

You can use Premiere to edit the audio only -- with frame-accurate precision, but you'll have to remux it in something else if you don't want to reencode the video.

hi
i tried yesterday , i exported the audio and i remux it with avidemux last version 64bit
but i got the voice out of sync

thanks

mp4 is a "raw" format and tray to edit it "as it is", using AVIDemux , is a pain in the a** in special while syncing you "final" authoring.


AUTHOR AUDIO:
1.- Mux out the audio stream from the mp4, with Audacity or AudioCoder: to author the audio stream (Adjust volume, add filtering, etc.)
2.- Mux it back in (new audio stream) with the video using AVStoDVD. By switching the original audio stream for the new one, already edited [Make sure that the timing is equal on the Audio & the Video].
3.- Encode the mp4 file to a .vob with AVStoDVD to joint the video file with the new audio stream.
4.- at this point you can return it back to an mp4 file ...or continue upgrading the file. *[My personal first choose]*

AUTHOR VIDEO:
5.- After encoding the mp4 file into a .vob (VTS = V_TS). You can keep editing the Video & Audio together with-out sync headache.

Follow my post's as Mrguss at:
http://forums.afterdawn.com/threads/how-do-i-autoloop-an-mp4-on-a-cd-or-dvd.750046/

Good luck.

[rama]

avidemux can do it and premiere cc doesn't?

You can use Premiere to edit the audio only -- with frame-accurate precision, but you'll have to remux it in something else if you don't want to reencode the video.

hi
i tried yesterday , i exported the audio and i remux it with avidemux last version 64bit
but i got the voice out of sync

thanks

mp4 is a "raw" format and tray to edit it as it using AVIDemux , is a pain in the a** in special while syncing you "final" authoring.


AUTHOR AUDIO:
1.- Mux out the audio stream from the mp4, with Audacity or AudioCoder: to author the audio stream (Adjust volume, add filtering, etc.)
2.- Mux it back in (new audio stream) with the video using AVStoDVD. By switching the original audio stream for the new one, already edited [Make sure that the timing is equal on the Audio & the Video].
3.- Encode the mp4 file to a .vob with AVStoDVD to joint the video file with the new audio stream.
4.- at this point you can return it back to an mp4 file ...or continue upgrading the file. *[My personal first choose]*

AUTHOR VIDEO:
5.- After encoding the mp4 file into a .vob (VTS = V_TS). You can keep editing the Video & Audio together with-out sync headache.

Follow my post's as Mrguss at:
http://forums.afterdawn.com/threads/how-do-i-autoloop-an-mp4-on-a-cd-or-dvd.750046/

Good luck.

Hi DJ_ValBec!!
thanks a lot for a lot of information!
really appreciate it , i will try

[DJ_ValBec]

@ rama

Yw.

[hello_hello]

There's no reason why you shouldn't be able to extract the audio from a file, adjust it's volume, then add it back to replace the original version without it going out of sync with the video, but sometimes......

The audio isn't continuous inside the video container (AVI, MP4 or MKV etc), or in other words, there's gaps. When you extract the audio it's extracted without accounting for the gaps, so when you add it back with the video, the lack of gaps makes it go out of sync. That doesn't happen much, but it does happen. Or it can be something simple like there's a delay applied to the audio, but after extracting it and remuxing, if the same delay isn't applied it won't be in sync.

For AVIs you can open them and extract the audio with VirtualDub. "File/Export Raw Audio". Most likely the audio will be MP3 or AC3. Either way you can import it into an audio program such as Audacity to modify it, or if it's MP3, try MP3DirectCut. With MP3DirectCut you can modify the volume of the whole MP3, or just parts of it, then resave it as a new MP3 without any re-encoding so there's no quality loss.

I've used VirtualDub a lot for replacing the audio in AVIs. You'd open the original AVI, select Direct Stream Copy as the video compression method under the Video menu (no re-encoding) and to replace the audio, it's the "Audio/Audio From Other File" menu. Select your newly modified audio, then use the "File/Save As AVI" menu to save the new version.

If VirtualDub happens to offer a warning about MP3 audio being variable bitrate and offers to re-write the MP3 header, tell it "no" or it will put the audio out of sync. That warning is left over from the dark ages and there's an option in VirtualDub's preferences to disable it.

For other file types you'd extract and replace the audio with different programs. ie MyMP4Box for MP4 or for MKV gMKVExtractGUI will extract it and MKVMergeGUI will remux it. You can modify the audio with any audio editor once it's extracted. Obviously you can't delete sections or change it's length as that would put it out of sync with the video. Adjusting the volume and/or converting to another format should be fine though.
I know nothing about Premiere, so I can't help with using it.

If you check the original file with MediaInfo (text or HTML view) you'll be able to find out if there's a delay applied to the audio. It'll be listed as "delay relative to video" in the audio section. If there's no delay listed, there isn't one. If there is you need to apply the same delay when replacing the old audio with the modified version. All the programs listed above let you specify a delay for the audio stream.

For the odd occasion the audio is out of sync after the original version is replaced with the modified one, I'd try extracting the audio with eac3to as it'll attempt to compensate for any problems or gaps etc. That's a story for another time though......

[rama]

avidemux can do it and premiere cc doesn't?

You can use Premiere to edit the audio only -- with frame-accurate precision, but you'll have to remux it in something else if you don't want to reencode the video.

hi
is there a video tutorial about premiere how edit audio only with frame precision ?
i bought a lynda tutorial but it 's not covered

thanks

[newpball]

is there a video tutorial about premiere how edit audio only with frame precision ?
i bought a lynda tutorial but it 's not covered

Not that I know of but it is basically the same as editing video. Only thing to watch is to set the time rulers in the timeline correctly e.g. frames instead of samples.

[rama]

is there a video tutorial about premiere how edit audio only with frame precision ?
i bought a lynda tutorial but it 's not covered

Not that I know of but it is basically the same as editing video. Only thing to watch is to set the time rulers in the timeline correctly e.g. frames instead of samples.

how can i do it?
i mean set frames instead sampels

thanks a lot

[newpball]

is there a video tutorial about premiere how edit audio only with frame precision ?
i bought a lynda tutorial but it 's not covered

Not that I know of but it is basically the same as editing video. Only thing to watch is to set the time rulers in the timeline correctly e.g. frames instead of samples.

how can i do it?
i mean set frames instead sampels

thanks a lot

Make sure you have a (dummy) video on the timeline with the required fps. Then right click on the timeline where the ruler numbers are and select "Time Ruler Numbers" for frames and "Show Audio Time Units" for audio samples. Then if you set "Time Ruler Numbers" all audio editing operations on the timeline will be at the frame level.

[rama]

is there a video tutorial about premiere how edit audio only with frame precision ?
i bought a lynda tutorial but it 's not covered

Not that I know of but it is basically the same as editing video. Only thing to watch is to set the time rulers in the timeline correctly e.g. frames instead of samples.

how can i do it?
i mean set frames instead sampels

thanks a lot

Make sure you have a (dummy) video on the timeline with the required fps. Then right click on the timeline where the ruler numbers are and select "Time Ruler Numbers" for frames and "Show Audio Time Units" for audio samples. Then if you set "Time Ruler Numbers" all audio editing operations on the timeline will be at the frame level.

hi
i haven't this option