When preparing subclips, it unsync my audio

[Alexis Krier]

Hello, i have a problem with audio sync.

Once I've prepared my video (which has sound synchronized), sync my slide, I start the upload so it builds the subclips with ffmpeg.exe. The problem is that the new mp4 files has the sound unsync by approximatively 1 sec.
So I look in the ppdata/subclips folder open the video file, indeed it is unsync.
I look in the ppdata/video folder, open the source file, sound ins sync.

is there a spécial conf to handle params to ffmpeg.exe or sthg like this?

thank you and you've done a great job with this publisher, well, most of the time ;)

Alexis

[Benjamin Dobler]

Hey Alexis,

unfortunately the ffmpeg settings can`t be changed in the current version.

There is also nothing really happening which could cause this - the current settings looks

like this:

processArgs.push("-ss");
processArgs.push(startVal);
processArgs.push("-t");
processArgs.push(duration);
processArgs.push("-i");
processArgs.push(decodeURI(inputFile.nativePath));
processArgs.push("-vcodec");
processArgs.push("copy");
processArgs.push("-ar");
processArgs.push("44100");
processArgs.push(decodeURI(outputFile.nativePath));

I`ve also never seen this happening before so maybe it`s a special combination of audio/video codec.

Could you send me your video file so i can take a look - that would be sweet.

Thanks

Benjamin (parleys.com)

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[Alexis Krier]

Ok here it is http://dl.free.fr/voQ4UEyAE

the one named 0_1879000_135561817668741.mp4 is in subclips folder, the other one in video (the one used in the track system)

thx

Alexis

[Benjamin Dobler]

Hey,

thx for the files. I`m almost certain that this is a bug in the windows build of ffmpeg :-(

Testing it in the publisher on my mac works fine. Still need to find the time to test it

on a windows machine…

If you feel adventurous you could try with a different ffmpeg build. You can get the latest 

here: http://ffmpeg.zeranoe.com/builds/

And then in the publisher you can go to Options > Path Configuration and set the ffmpeg path to this new build.

Not sure if that helps but it might be worth a try. I`ll also try once i get my win machine ready :-)

Thanks for your help

Benjamin

To view this discussion on the web visit https://groups.google.com/d/msg/parleyscom/-/qivGd42ouWEJ.

[Alexis Krier]

Woo, indeed that would be bad luck :(
For sure I'm going to test your idea too, thx

[Alexis Krier]

Hi again Benjamin, you were right the windows build packaged with the publisher has a problem, using this one solve the problem:
http://ffmpeg.zeranoe.com/builds/win32/static/ffmpeg-20121125-git-26c531c-win32-static.7z

Actually I didn't test it on my computer I use to publish the talk which runs is under windows XP. i've tested it for a try under a windows 7 system.
I think it won't make any difference. I will test it this evening if there is another problem I will tell you.

Thx very much :)

Alexis for Toulouse JUG

[Björn Martin]

Thanks for the hint! I specified an updated FFMPEG version and my audio sync problems vanished as well. Using this version (output is the result of ffmpeg -version):

ffmpeg version N-49757-g969039e
built on Feb  9 2013 20:28:03 with gcc 4.7.2 (GCC)
configuration: [...]
libavutil      52. 17.101 / 52. 17.101
libavcodec     54. 91.102 / 54. 91.102
libavformat    54. 62.100 / 54. 62.100
libavdevice    54.  3.103 / 54.  3.103
libavfilter     3. 37.101 /  3. 37.101
libswscale      2.  2.100 /  2.  2.100
libswresample   0. 17.102 /  0. 17.102
libpostproc    52.  2.100 / 52.  2.100

Cheers, Björn