Originally Posted by eagle_2
I realy wish we could get some kind of confirmation from Micca on whether or not this stuttering/framerate issue can be sorted out. If it is an issue with the chip and can't be corrected in firmware, please let us know so that those of us who have issues with the stuttering can make a decision on whether we want to keep the unit or not. If it can be fixed in firmware, please let us know because at this point there are many concerned customers who just want to know if this can even be resolved or not.
The issue reported here has been observed on 3 different brands of the players based on the the Realtek 1186 chip, by two different users, in 2 threads or more threads.
The issue is that when playing content on the micca, iconbit and himedia players based on the Realtek 1186 chip, some users are reporting a periodic stutter in the playback video, when observed on the TV.
The stutter is an extra frame or dropped frame, causing a lack of smooth motion in the content being played, when viewed on the connected monitor.
The stutter lasts for only a fraction of a second. The first stutter occurs at a random time after playback starts, but within 42 seconds of when playback starts. The next stutter occurs about 42 seconds after the previous stutter, thus being periodic in nature and related to the frame rate of the video content and frame rate of video playback.
To help isolate and replicate the problem, a user (avsforum name Hokeysmake) generated these test files. These files can be downloaded at either of the following links.
7 files inside a 7zip file requires 7zip extractorhttp://st7.us/MotionBarsH264.7z
Or get this
7 files uses the extractor built into windows (larger zip file)http://st7.us/moving-h264-7files.zip
The files inside the two zips at the links above are the identical 7 files. The links differ in the type of lossless compression used to make a single file download pack.
The test files use motion bars
with frame counters.File Names Describe Frame Rates
If ordinary video was played instead of test files, an observant user would notice the stutter if there was motion in the playback video at the time of the stutter occurring.
The stuttering occurs when the 1080 playback is selected, for the files that have frame rates of 59.94 and 23.976.
Playing the test files that have names indicated frames rates other than those listed, which are included in the test set, does not result in a stutter.
It is conclusively shown that the stutter occurs when the subject player is directly connected to the TV, and is not caused by a slow hard drive, nor LAN bandwidth problem, nor AV gear in the HDMI connection.
The stutter has been shown to occur on more than one brand of TV, although there is evidence that some TVs do not display the stutter, while other TVs do. It is not conclusive that this is an interoperability issue with specific TVs, though the possibility exists.
One of the users has reported that a different brand and model of a media player, which does not use the Realtek 1186 chip, does not produce the stutter
with any of the test files. Importantly
, the same user reported that with the same TV connected to the Realtek 1186 based player, the stutter occurs. Therefore, although there may be an interoperability problem between specific TVs and the Realtek 1186 based players, it is not deemed to be the fault of the TV.
This analysis indicates that there is a lack of ability in the Realtek 1186 based players, with currently available firmware, to smoothly play all frame rates, while other type of players can play smoothly, with all other conditions the same.
The stutter can be be eliminated by playing the files at 720 instead of 1080, but this forces the user to adopt a reduced resolution in the played back image quality.
The requirement and variability of TVs and a human observer can be eliminated from testing by using HDMI capture and test equipment connected to the HDMI output of the player being tested. None of the users reporting this stutter problem have yet reported using test equipment to analyze the problem. All testing was done by human observers on retail purchased TVs. Some observers are more adept at seeing the stutter than others, since it was reported that when there is more than one person watching at the same time, not all the people watching see the stutter. It is just for a fraction of a second every 42 seconds, and can be lost in a blink.
Since the stutter has been reported by several users and with several brands, it is less likely this is a defect in the particular player, and more likely a chip design or firmware issue.
The above description contains diligently collected information from several individuals. It was posted here to inform those who are associated with the vendors of these players.