Low Frame rate with new Apple TV.
Hi,
I just watched a purchased TV show (Top Gear) on my new Apple TV, connected to a 42" flatscreen, and I am not impressed at all with the quality. Apart from the resolution, which we all now, the image is jittery, and the frame rate is so low that when somebody moves his arm you can wee it jump from one frame to another.
Looked at settings on my TV (Sony Bravia) to see if there is something there, but I don't see any setting that might affect this.
Anyone else has this experience?
Kind Regards,
Erwin
Same issue with a British movie I just tried to stream and I didn't think this would help, but it worked like a charm! Definitely the cinemotion. I didn't even know I had that setting. It's way to the left under picture in my Bravia onscreen menu. Just make sure that you turn it off for the correct input. Im more used to using the motion enhancer toggle under options, but that wasn't it.
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9400M intermittent low frame-rate : let's get heard !
hello
i have the exact same problem described on this thread
http://discussions.apple.com/thread.jspa?threadID=2085771&tstart=1
" Has anyone else noticed, the performance of the NVIDIA 9400M graphics chip is intermittent. Sometimes everything will be fast and smooth and fluid, and suddenly it will switch to having a low frame rate.
A good example of this is in iPhoto's Full-Screen Edit mode. As you tap through the image with the right/left arrows, the animation can be quite jerky and slow. Then suddenly it will switch to being really fast.
Have Apple just not optimised the NVIDIA 9400M graphics drivers yet? Will its performance be better in the near future? "
sam problem, except it's on a 24" iMac . (latest one - 2 X 2.66 ghz + 4go RAM + 9400m)
the problem happens constantly when i use my firewire soundcard. guess what : i'm a musician, and my firewire soundcard is on all the time !
it also happens when i copy files from my external firewire hard disk, or if i use my macbook on target mode.
the only way to make this problem disappear is to switch to 1280 X 960 resolution (or below). therefore the 9400M has enough power to overcome the drain created by ... either bad drivers or a problem with firewire... i don't know.
anyone knows when the drivers will be updated ? if a new firmware is in the work ?
thanks
Message was edited by: Bontempii guess not so many people use the firewire 800 port.
had to pay 15 euros to get a 800>400 cable, so no wonder ...
here's my bug report
hello
here's my setup :
iMac 2.66 ghz / 4 gigs of RAM / 640 go HD / Nvidia 9400M graphic chip
Leopard 10.5.7
when any firewire device is in use, the frame rate switches from fast / fluid to slow / lag-ish.
simply launching Dashboard shows the frame rate drop. same problem with Expose.
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the problem disappears when i turn off my soundcard, or when the external hard drive is idle. another way to "fix" the problem is switching to a lower resolution ( 1280 X 960 ).
i've spent more than 30 minutes with apple on the phone, we did a lot of tests, and the technician came to the conclusion the computer was perfectly working.
this definitely looks like a driver problem.
i've started a discussion about the matter here :
http://discussions.apple.com/thread.jspa?threadID=2085911&tstart=0
some users have the same problem :
http://discussions.apple.com/thread.jspa?threadID=1959109&tstart=0
please keep me up to date
thanks
matthieu
Message was edited by: Bontempi -
Hi, I am trying to play a list of jpeg files using player, as if it is a jpeg movie. But I am getting low frame rate, like 10 fps. However, by using the same jpeg files, and make it in a .mov file, the player could play it at 30 fps (the setting during making the stream). The .mov file is produced using the same setting as the program JpegImagesToMovie posted on the forum.
The testing applet that run the movie in full rate is (simplified, without exception catching):
url = new URL(getDocumentBase(), mediaFile);
mediaFile = url.toExternalForm();
MediaLocator mrl = new MediaLocator(mediaFile);
Player player = Manager.createPlayer(mrl);
player.start();
For the JPEG file stream, the player is created as:
Player player = Manager.craetePlayer(customdatasource); // refer to below for the custom data source class
1. Is it I need to make the data source format to something else , so that the player will play it with 30 fps instead of the slow 10 fps rate?
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I created my own PullBufferDataSource and PullBufferStream. Below is the list of my program. I make the datasource and datastream to load a image file each time the:
read( Buffer buf)
method is called in the datastream class.
public class MJPEGDataSource extends PullBufferDataSource {
protected InputStream sourceStream = null;
private MJPEGDataStream streams[];
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streams = new MJPEGDataStream[1];
streams[0] = new MJPEGDataStream(width, height, frameRate, sourceFile);
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public MediaLocator getLocator() {
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return streams;
public String getContentType() {
return streams[0].getContentDescriptor().getContentType();
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public void disconnect() {
// TODO: Add your code here
public void start() throws IOException {
public void stop() throws IOException {
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protected boolean eofMarker;
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String sourceName;
int width, height;
VideoFormat format;
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this.width = width;
this.height = height;
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new Dimension(width, height),
Format.NOT_SPECIFIED,
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(float) frameRate);
cd = new ContentDescriptor(ContentDescriptor.RAW);
try {
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catch (IOException ex) { }
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if(eofMarker)
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else
try {
return infile.available() == 0;
} catch (IOException ex) {
return false;
public void read(Buffer buf) throws IOException {
if (infile.available() <= 0) {
System.err.println("Done reading all images.");
buf.setEOM(true);
buf.setOffset(0);
buf.setLength(0);
eofMarker = true;
return;
byte data[] = null;
if (buf.getData() instanceof byte[])
data = (byte[]) buf.getData();
byte byteSize[] = new byte[4];
infile.read(byteSize);
int size = byteToInt(byteSize);
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data = new byte[size];
buf.setData(data);
infile.read(data, 0, size);
buf.setOffset(0);
buf.setLength(size);
buf.setFormat(format);
buf.setFlags(buf.getFlags() | buf.FLAG_KEY_FRAME);
public Format getFormat() {
return format;
public ContentDescriptor getContentDescriptor() {
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public long getContentLength() {
return SourceStream.LENGTH_UNKNOWN;
public boolean endOfStream() {
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public Object[] getControls() {
return new Object[0];
public Object getControl(String controlType) {
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if(in.length > 4) return -1;
int result = (in[3] << 24) + ((in[2] << 16) & 0x00FF0000) +
((in[1] << 8) & 0x0000FF00) + ((int)(in[0]) & 0x000000FF);
return result;Hi again.
I found the solution to my problem. In the read(Buffer buf) function, the buf timestamp and sequencenombur should be set in order to play at the expected frame rate (30 fps in my case):
public void read(Buffer buf) throws IOException {
if (infile.available() <= 0) {
System.err.println("Done reading all images.");
buf.setEOM(true);
buf.setOffset(0);
buf.setLength(0);
eofMarker = true;
return;
byte data[] = null;
if (buf.getData() instanceof byte[])
data = (byte[]) buf.getData();
byte byteSize[] = new byte[4];
infile.read(byteSize);
int size = byteToInt(byteSize);
if (data == null || data.length < size) {
data = new byte[size];
buf.setData(data);
infile.read(data, 0, size);
buf.setOffset(0);
buf.setLength(size);
buf.setFormat(format);
buf.setFlags(buf.getFlags() | buf.FLAG_KEY_FRAME);
// ====== added line ========
long time = (long) (seqNo * (1000 / format.getFrameRate()) * 1000000);
buf.setTimeStamp(time);
buf.setSequenceNumber(seqNo++);
Thanks for reading.
Ryan -
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