mpegplayer A/V sync - please report experiences

[Llorean]

http://www.rockbox.org/twiki/bin/view/Main/PluginMpegplayer

10ish is expected on an iPod Video fullscreen.

He thought you were using an old build because you were renaming to m2v. .mpg should and will work fine with a properly installed current build.

[boudyouck]

Thanks guys, the bootloader thing worked!!

when i tried it i got good speeds (from 18 to 24fps) but sometimes  i got an
"Prefetch abort, Error in C0EDBABE"

its kinda cool sounding error,but can somebody help me solve this problem?
when i play a video ill first get this error, ill restart rockbox then it'd be fine.
I've tried diff'rent videos incl. the elephants dream. any help would be much appreciated.

Thanks again, you guys are awesome

[e-budur]

I have a 30 gb ipod video.
When I try A / V cable to get video into my tv, nothing is seen on tv but the sound is heard properly.

I set
Display FPS:Yes
Limit FPS: Yes
Skip Frames: Yes

I attempt to play the following file.
http://download.rockbox.org/mpeg/elephantsdream-q6-320x176-596kbps.mpg

Mpeg player plays the file perfect. But I need to have the video through my tv screen.
What I am suppose to do more to get out of this problem?
Thx in advance

[Llorean]

First: Please read our forum guidelines, non-real words like "thx" are not acceptable here.

As for the video output cable, this is not supported at this time.

[e-budur]

Thx for your reply,
May I ask for the actual word referring to "A/V sync"?

Thx a lot

[Chronon]

He just told you not to use "thx" and then you blatantly use it twice in your next post.  

I do not understand your question.

[Soaa-]

A/V Sync is Audio/Video synchronization.  It's a feature that keeps track of the audio and video streams and synchronizes them, so there isn't one that plays faster than the other.

It has nothing to do with A/V cables, so it's normal that you don't see the video on TV.

[e-budur]

Thanks for your kind explanations...
I think there is no way to stream video over TV-out cables

[cool_as_ice]

i have an 80 gb video ipod. The videos it plays are totally out of sync. The audio is a delayed by more than 10 seconds. I checked the same file on the computer on the vlc player and it works fine there. Anyone have a solution to this problem?

[Chronon]

You need to provide more information than that.  What revision are you using?  What settings are you using for mpegplayer (particularly the Skip frame and limit FPS options)?  Finally, what settings did you use when you transcoded your files for use with Rockbox?

[linuxstb]

i have an 80 gb video ipod. The videos it plays are totally out of sync. The audio is a delayed by more than 10 seconds. I checked the same file on the computer on the vlc player and it works fine there. Anyone have a solution to this problem?

If you've encoded your videos to full-screen resolution and full frame rate (i.e. 25-30fps), then that is to be expected on the ipod video - Rockbox can't decode the video fast enough to display it in realtime, so it lags behind the audio.

More information on mpegplayer performance is available in the wiki page:

http://www.rockbox.org/twiki/bin/view/Main/PluginMpegplayer

[marco.vermeulen]

Hi all,

I own a 5.5G iPod Video, with 80G hard drive. I recently switched to rockbox and absolutely love it! The only problem that remains for me to sort out is that I can't get my video playback to work properly. I have followed all the instructions at http://www.rockbox.org/twiki/bin/view/Main/PluginMpegplayer, but no luck   I keep getting excessive framedrop, and can't seem to solve this no matter what I try.

I'm using ffmpeg with the following command line when encoding:
ffmpeg -i claymore_026.avi -s 320x240 -vcodec mpeg2video -b 200k -ab 192k -ac 2 -ar 44100 -acodec libmp3lame claymore_026.mpg

This is what ffmpeg reports when encoding:
Input #0, avi, from 'claymore_026.avi':
  Duration: 00:22:39.7, start: 0.000000, bitrate: 1063 kb/s
    Stream #0.0: Video: mpeg4, yuv420p, 704x400 [PAR 1:1 DAR 44:25], 29.97 tb(r)
    Stream #0.1: Audio: mp3, 48000 Hz, stereo, 160 kb/s
Output #0, mpeg, to 'claymore_026.mpg':
    Stream #0.0: Video: mpeg2video, yuv420p, 320x240 [PAR 33:25 DAR 44:25], q=2-31, 200 kb/s, 29.97 tb(c)
    Stream #0.1: Audio: libmp3lame, 44100 Hz, stereo, 192 kb/s

As you can see, the framerate is 29.97, but I can't seem to force a lower framerate. I give ffmpeg the switch -r 18.2, but it does not allow frame rates below 20 fps. mpegplayer reports a framerate of 18.2 when I do the benchmark test using the recommended settings (disable limit fps & skip frames).

Has anyone else had success with an ipod 5.5G? Surely I'm not the only person struggling with this issue. I use my ipod for watching videos all the time, so this is a rather important facet that I need to get working. Can anyone please help me.

Thanks in advance,
Marco.
release: r15942-071216

[cool_walking_]

Marco, ffmpeg expects the switches to be in a certain order, like so:

ffmpeg [infile options] infile.avi [outfile options] outfile.mpg

So make sure you have the "-r 18" in the [outfile options] section.

I don't know if you can have a decimal point in the framerate.

If ffmpeg explicitly said that it can't do framerates below 20fps, you should try another program.  I use mencoder with no problems.

[marco.vermeulen]

Hi there,

Thanks for your prompt reply. As for ffmpeg, I did run it with the -r switch in the correct place, but ffmpeg complains that the frame rate is not supported for the container type. The moment I supply a framerate of >20, it encodes fine, but plays back jerky on the ipod. Perhaps I should give mencoder a try...

Would it be possible for you to post your exact command line that you used for mencoder? That would be a great help.

Thanks & Cheers,
Marco.

[Llorean]

Use -strict -1 as an additional switch.