Support native MP4 files from Sony PMW-EX1 camera

[vncnt]

The files that are written by the new Sony PMW-EX1 camera to the SxS memory cards is a MP4 container with a MPEG2 videostream and a stereo uncompressed PCM audiostream.

The latest version of VLC media player is able to playback the MP4 container and succesfully display the videostream.

However, audio is silent.
This is incorrect.

[VLC_help]

Could you provide a sample file?

[bugmenot]

I dont know if the above poster ever followed through, but here are two sample files, there is only ambient audio, but it should be enough to work with, these were the only really small raw files I had laying around.

VLC playing these would really be helpful to a lot of people, the sony clip software is horrid.

http://rapidshare.com/files/122691816/1 ... 1.MP4.html

http://rapidshare.com/files/122693029/1 ... 1.MP4.html

[Arite]

Using the first sample the video plays back with sound in MPlayer 1.0rc2. In VLC the messages output (more-or-less looped):

Code: Select all

main warning: buffer is 95980 in advance, triggering downsampling main warning: audio drift is too big (-128126), clearing out main warning: timing screwed, stopping resampling main warning: audio drift is too big (-143960), clearing out

The audio FourCC is "twos" (stereo 16-bit LPCM as vncnt said). I muxed the file into a Matroska (*.mkv) file with mkvtoolnix and that plays back with sound in both 0.8.6h and latest 0.9.0-git nightly without a problem.

Cheers, Arite.

[bugmenot]

Arite,

I am not sure what you are getting at, that its best to take the steps necessary to convert the file to MKV, etc. etc to make it playable (and you wont do it)?
Or that its fairly easy to do as raw input for the next build of VLC (and you might do it)?

Because the software that comes with the camera converts to MXF which plays fine all over. The point that all of us Sony EX1 and soon EX3 and eventually other EX model owners can save a lot of time and energy with the ability to play these files directly off the media, without conversion...

[Arite]

I was just stating the results of my tests etc. which indicates it is a bug in the MP4 demuxer. Fill a bug report.

Arite.

[bugmenot]

Arite,

Thanks for the clarification. I'll get the bug up there. Thanks.

Update: Thanks to jb, who helped me get is listed in trac, here:
https://trac.videolan.org/vlc/ticket/1621

If you need more samples, please let me know...

[pkbristol]

I have the Sony EX1.
Even after converting the mp4 files into MXF files, VLC does not play footage which was recorded in 1440x1080x50i resolution,however 1920x1080x50i and 720/50p does play ok.
Also, very soon there will be an update to Sony Vegas pro 8 editing program which will allow use of raw MP4 footage from the EX1,so no further coversion of MP4 into MXF will be needed. So having VLC able to play MP4 direct will be very useful.

Paul.

[bugmenot]

Paul,

Perhaps it would be helpful to provide some sample footage recorded in 1440x1080x50i as I have only posted 1080x60i above, and I dont have anything in the 1440 format handy...

Thanks.