Choppy playback of QuickTime / Motion JPEG video

[10piplup09]

First of all, many thanks to developers for all time spent in coding and improving wiimc. I think it worthwhile to have a wii just for running wiimc. Really!!!

Coming back to the point, I have some problem in playing videos recorded with a Nikon coolpix camera. MPlayerCE 0.80 r619 plays them smootly, while using wiimc the playback is choppy. I tried both wiimc v1.1.0 and a custom build based on svn r730.

The video specs are the following:

Complete name                    : E:DSCN2563.MOV

Format                           : QuickTime

Format/Info                      : Original Apple specifications

File size                        : 23.1 MiB

Duration                         : 22s 733ms

Overall bit rate                 : 8 517 Kbps

Movie name/More                  : NIKON DIGITAL CAMERA

Encoded date                     : UTC 2010-06-05 08:29:22

Tagged date                      : UTC 2010-06-05 08:29:22

Writing library                  : Nikon

Origin                           : Digital Camera



Video

ID                               : 1

Format                           : JPEG

Codec ID                         : jpeg

Duration                         : 22s 733ms

Bit rate mode                    : Variable

Bit rate                         : 8 428 Kbps

Width                            : 640 pixels

Height                           : 480 pixels

Display aspect ratio             : 4:3

Frame rate mode                  : Constant

Frame rate                       : 30.000 fps

Compression mode                 : Lossy

Bits/(Pixel*Frame)               : 0.914

Stream size                      : 22.8 MiB (99%)

Language                         : English

Encoded date                     : UTC 2010-06-05 08:29:22

Tagged date                      : UTC 2010-06-05 08:29:22



Audio

ID                               : 2

Format                           : PCM

Format settings, Endianness      : Little

Format settings, Sign            : Unsigned

Codec ID                         : raw

Duration                         : 22s 733ms

Bit rate mode                    : Constant

Bit rate                         : 64.0 Kbps

Channel(s)                       : 1 channel

Sampling rate                    : 7 875 Hz

Bit depth                        : 8 bits

Stream size                      : 175 KiB (1%)

Language                         : English

Encoded date                     : UTC 2010-06-05 08:29:22

Tagged date                      : UTC 2010-06-05 08:29:22

If useful, I can upload a short video (in the tracker area) and/or test patches.

Thanks in advance

[rodries]

It would be helpful to upload a sample.

[cadbusca]

That is a huge bit rate. Have you enabled framedropping? Its unlikely the WII can play at that bitrate unless it can drop at least half the frames. (standard DVD’s are 4000 kbps)

[rodries]

jhb50 is right, probably on mplayer ce you have frame dropping enabled. try enabling it in WiiMC.

[10piplup09]

Thanks Tantric and jhb50 for your quick reply.
I noticed the high bitrate of the video stream and I also tried to store the video on a sdhc card in place of a usb memory key, but the result was the same.
I’m quite sure the frame dropping was enabled in wiimc too. Now I’m at work 🙁 but as soon as I get home I’ll check it again and upload a sample.

[cadbusca]

Won’t matter where it is stored. Its a WII CPU problem.

[10piplup09]

I uploaded a short .mov sample as issue #296 http://www.wiimc.org/tracker/index.php?do=details&task_id=296.
I can confirm that the frame dropping was enabled in WIIMC. Disabling it, video plays smootly but slower than real-time and out of audio sync.

[cadbusca]

Yes, that’s the symptom of an AVC file over 640 wide and bitrate exceeding the WII’s capability. The audio plays fine but the half speed video makes it seem out of sync. The solution is use VLC-Shares.

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