Odd audio at MVP with some mpegs

[Dave72]

Some of the mpeg files on my hd have audio troubles when played on the MVP.
The audio is either silent or highspeed (and out of sync then of course).

AVIs etc play fine.
If I switch dongle to a standard dongle.bin.. they all play fine.

Ive tried a few different mvpmc.bin, they all seem to have the same problem. (its unclear which mvpmc we should actually be running for a simple MVP ?)

I had this problem back with 1.3 of gbpvr, I recently updated with a fresh install of 1.47.. same problem though.

Funny thing is, Im sure at some point I had mvpmc loaded, and everything played.. perhaps there's a version that works, but I can no longer find it.

Heres the MediaInfo clip from a recent file that doesnt work.
Video
ID : 224 (0xE0)
Format : MPEG Video
Format version : Version 2
Format profile : Main@Main
Format settings, Matrix : Default
Duration : 6mn 22s
Bit rate mode : Variable
Bit rate : 3 801 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate : 29.970 fps
Colorimetry : 4:2:0
Scan type : Progressive
Bits/(Pixel*Frame) : 0.413
Stream size : 174 MiB (92%)
Audio
ID : 192 (0xC0)
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 2
Duration : 6mn 22s
Bit rate mode : Constant
Bit rate : 160 Kbps
Channel(s) : 2 channels
Sampling rate : 48.0 KHz
Resolution : 16 bits
Stream size : 7.30 MiB (4%)

Now, all my videos are not the same format. Some are Mpeg1 video.. (me playing around with ffmpeg CL options in my converter program).. some are different audio etc. Im pretty sure they all played at some point.

AFAIK, this recent one above 'should' play.

I noticed some other posts with similar issues, but they didnt follow through.

[mvallevand]

If you are making the files on your own, my first guess is that they have a bad time coding. mvpmc does a lot to sync a/v on reasonable mpeg files but if they are way off you might need to just pass them to the hardware and hope and turn this feature off with --no-seek-sync

Also GBPVR doesn't support mpeg1

The prefered dongle has been linked in the survival guide for many versions of gbpvr http://forums.gbpvr.com/showpost.php?p=3...ostcount=2

Martin

[Dave72]

If you are making the files on your own, my first guess is that they have a bad time coding. mvpmc does a lot to sync a/v on reasonable mpeg files but if they are way off you might need to just pass them to the hardware and hope and turn this feature off with --no-seek-sync

I dont supposed it matters which way the MVPMCStartupConfig line reads ?
Mine is now
mvpmc --startup emulate --emulate 192.168.1.101 --no-seek-sync &

I made sure I had the 30/9/2008 mvpmc dongle loaded up, cycled power etc

Still, no sound.

FWIW, the files play fine in Graphedit

This is my ffmpeg control line
-y -vcodec mpeg2video -b 4000k -s 640x480 -r 29.97 -ac 2 -async 1 -ab 160000

[mvallevand]

Email me a 15 MB sample and I will have a look. The ability to play from DS is meaningless to embedded devices.

Martin

[Dave72]

I see what you mean about the sync option. Some files that do play now are a hair off sync.
I might have 'tested' a mpeg1 video file earlier.. I forgot which one I tried. Im fairly certain they do play with the original dongle (although Id have to swap dongles again to verify..).
I have a recently converted mpeg2 file that plays slightly out of sync and a little choppy with the no-seek-sync option, but no audio at all without that option.
Is there an easy tool to chop off the end of an mpeg w/o corrupting the file ? I thought I had a tool like that here.. cant find it yet..
(this file is 191meg)

[mvallevand]

GBPVR doesn't support mpeg1 not the MVP.

Here is the sub's cut utility but any binary cut will suit my needs.

http://forums.gbpvr.com/showpost.php?p=3...ostcount=3

Martin

[Dave72]

Clip sent.

Sub's util is only for TS files, i think.

I tested my clip on the mvp.. audio, but out of sync (and I have the sync on.. ie, no command in the config.xml).
Oddly, the main file (for that clip) didnt play before, but did now.

I dunno if its b/c the wife was watching some avi's.. (cant see how, but thats about the only thing that changed). This is getting odd..

[mvallevand]

Your sample doesn't play on mvpmcx2 and GBPVR shows it as only 1 second length both showing signs of timeline issues in the file. I couldn't even play it with PVRx2 or MPC on my PC and with VLC the timeline jumps all over the place.

With ffmpeg this error is pretty clear it is a bad transcode

Code:

Seems stream 0 codec frame rate differs from container frame rate: 59.94 (60000/1001) -> 29.97 (30000/1001)

If the it plays with the Hauppauge dongle, I doubt you will be able to navigate it with GBPVR.

Martin

[HtV]

Shouldn't the audio bitrate be written like this: 160k instead of 160000.
Maybe you should add the audio codec aswell: -acodec mp2

Hans

Edit: check the ffmpegdocs: http://ffmpeg.org/ffmpeg-doc.html

[HtV]

I reread your first post and it seems as if everything was done right by ffmpeg, so I doubt if my advice (above) will do any good.:o

Hans