need help with converting HiDef (sony) .mts video using mencoder

MikeP · 01-31-2009, 05:22 PM

I have been trying to decode Sony Hi Definition AVCHD Video as taken by their hard disk camcorder.

Mencoder is doing a very good job at converting the video but the audio is lagging behind ~1 second for every 10 seconds of video, so each minute, the audio goes ~6 seconds out of sync and its accumulative, so a 7 minute long video segment is out by around 40-45 seconds as the video nears the end.

The code below is what I am using to convert the 1920x1080 AVCHD .mts files to 1280x720 avi using a 2 pass encode.

Code:

mencoder 00466.mts -o 00466.avi -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=8000:vpass=1:turbo -fps 60 -vf scale=1280:720
mencoder 00466.mts -o 00466.avi -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=8000:vpass=2 -fps 60 -vf scale=1280:720

Does anybody know of a method to get the audio synced correctly?

I have tried with ffmpeg, but all I can get is the following

Code:

michael@mikepav:~/Movies/Temp$ ffmpeg -i 00466.mts
ffmpeg: symbol lookup error: ffmpeg: undefined symbol: ffm_nopts

Thanks in advance

Mike P

wesleybailey · 12-05-2009, 12:05 AM

Hi MikeP,
What Linux OS are you running? It seems the ffmpeg package on your system needs to be removed. Then install the latest version of ffmpeg.

I have successfully converted AVCHD videos using ffmpeg.

I wrote about my experience installing ffmpeg, and converting AVCHD videos here How to Install FFmpeg and Transcode AVCHD

Basically you download the lastest ffmpeg

Code:

svn checkout svn://svn.ffmpeg.org/ffmpeg/trunk ffmpeg

Then .configure ffmpeg

Code:

cd ffmpeg
./configure --enable-gpl --enable-libmp3lame --enable-libxvid --enable-libfaac --enable-nonfree
make
sudo make install

And finally transcode your video.

Code:

ffmpeg -i input.mts -vcodec libxvid -b 18000k -acodec libmp3lame -ac 2
-ab 320k -deinterlace -s 1440x1080 output.avi

If you experience issues with the audio syncing up, you can use the
-async 1 ffmpeg switch to correct this

Code:

ffmpeg -i input.mts -vcodec libxvid -b 18000k -acodec libmp3lame -ac 2 -ab 320k -async 1 -deinterlace -s 1440x1080 output.avi

H_TeXMeX_H · 12-05-2009, 04:55 AM

Indeed, I agree with wesleybailey, however I recommend you use '-async 48000' (or use the frequency of the audio), because if you use '-async 1' it does:

Code:

-async samples_per_second
    Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps, the parameter is the maximum samples per second by which the audio is changed. -async 1 is a special case where only the start of the audio stream is corrected without any later correction.

That usually works ok too, but not if the distortion still happens while encoding.

MikeP · 12-05-2009, 01:16 PM

Thanks guys.

This thread is very old, with me having started it on the 2nd January 2009. I had already found what I needed and no longer have access to the Sony handycam that produced the video. Nevertheless, I found the fix on my own within a few days of my original post on the MepisLovers forums. The people there are awesome and thee is not a lot there that gets missed.

The handycam was configured for PAL, which is not surprising, since everything here is PAL, not NTSC, so it comes as no surprise that my issue stemmed from my following the only prescriptions I could find, which were for NTSC based systems, so all I had to change was the FPS. The 60 fps was sampling too fast, I simply changed the fps to 50 had it all corrected and properly synced in no time at all.

I now use a much simpler method than playing around at the CLI level. I use
Winff 1.0.4 as the front end and a combination of ffmpeg 5:0.5+svn20090521 and mencoder 2:10.rc3svn20091002 as the backends.http://winff.org/html_new/

@wesleybailey, you might be interested in adding winff to your website

Mike P

oudinmelanie09 · 06-21-2010, 03:12 AM

there are many software which can help you to convert .mts video file to other video formats directly.
what i use is Aunsoft MTS converter which helps you to convert mts file to almost any other video format with the least loss of video quality.
and its conversion is quite fast.
you can google it.