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For the pros: Different length in audio- and file of the same stream

 (http://stream-recorder.com/forum/showthread.php?t=11279)

sebastian 03-19-2012 02:42 PM

For the pros: Different length in audio- and file of the same stream


 
Hi guys,

when downloading and merging the video files of be-at.tv (e.g. hxxp://www.be-at.tv/brands/wmc/surfcomber/waveform-with-victor-calderone-guests/ida-engberg.go ), the video and audio file (which are splitted) do have different lengths.

In my shown example, the downloaded mp3 is 01:28:36, but the video is 01:28:49! Also the video slider at the website itself shows 2nd length.

So how can I get the video and audio in sync? And what is the master lenght?

I guess this is a question for the pros. ;-)

Thanks in advance!

Bahman 03-19-2012 04:41 PM

Re: For the pros: Different length in audio- and file of the same stream


 
2nd one is master length, for sure!!
Avidemux can do this trick(sync) I think without re-encoding!!

sebastian 04-13-2012 01:22 PM

Re: For the pros: Different length in audio- and file of the same stream


 
Quote:
Originally Posted by Bahman (Post 42220)
2nd one is master length, for sure!!
Avidemux can do this trick(sync) I think without re-encoding!!
Ok, and do you know how?

svnpenn 04-13-2012 04:14 PM

Re: For the pros: Different length in audio- and file of the same stream


 
Just use FFmpeg

Code:
ffmpeg -i video.flv -i audio.mp3 -c copy out.flv

greenythebeast 04-13-2012 04:29 PM

Re: For the pros: Different length in audio- and file of the same stream


 
What codec is the audio?

svnpenn 04-13-2012 04:39 PM

Re: For the pros: Different length in audio- and file of the same stream


 
Quote:
Originally Posted by greenythebeast (Post 43375)
What codec is the audio?
Quote:
In my shown example, the downloaded mp3
​​​​​

greenythebeast 04-13-2012 04:48 PM

Re: For the pros: Different length in audio- and file of the same stream


 
Quote:
Originally Posted by svnpenn (Post 43377)
​​​​​
ah, i see. when using ffmpeg try adding "-async 1" without the quotes.

sebastian 04-14-2012 07:46 AM

Re: For the pros: Different length in audio- and file of the same stream


 
Okay, so this is the solution?

Code:
ffmpeg -i video.flv -i audio.mp3 -c copy out.flv -async 1
My 2nd question is: Is there also a solution for first demuxing the video? I muxed them with mencoder.exe.

Now I'd like to write a batch file, that first splits the audio and video, and after that muxes it again via the code you told me.

svnpenn 04-14-2012 12:55 PM

Re: For the pros: Different length in audio- and file of the same stream


 
You should be able to just "remux" the file.

Say you have a file with 1 video stream and 1 audio stream. You can do

Code:
ffmpeg -i bad-video.flv -c copy good-video.flv
If indeed you need to do it in 2 steps you can do this

Code:
ffmpeg -i bad-video.flv -map a -c copy astream.mp3
ffmpeg -i bad-video.flv -map v -c copy vstream.flv
ffmpeg -i vstream.flv -i astream.mp3 -c copy good-video.flv

sebastian 04-15-2012 09:31 AM

Re: For the pros: Different length in audio- and file of the same stream


 
Okay, but I'd have to add -async 1? Like
Code:
ffmpeg -i bad-video.flv -c copy good-video.flv -async 1
?


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