Any developers here have any idea what the problem is? or willing to get paid to help me fix this?
On Mar 25, 6:21 pm, "Eric Wong (hdmp4.com)" <ericwon...@gmail.com> wrote: > Hi, > We are developing applications that allows one to stream video from > any LAN device (e.g. computer, Android phone/tablet, etc) to an > Android device. > > Recently, we encountered a very strange problem on buffering and we > believe the issue is possibly related to Android's platform/framework, > i.e. lower level stuff. > > This video shows the problem we are > experiencinghttp://hdmp4.com/TCC9302_STB_buffering_problem.3gp > > I have tested the same operation on 7" Samsung Galaxy Tab (Android > 2.2), Nexus S (Android 2.3) and an Android setop box the one shown in > the video). > > The issues is that when the STREAMING video exceeds a certain bitrate, > the video either stops after 5-10 seconds, and then dies (or may > continue playing for a few more seconds before dying) or it simply do > not play at all. > > However, if I use an application that decodes the video by software > decoding instead of hardware decoding. The video was able to play from > start to the end without any problems. (due to slow CPU, arm11, > 800mhz, video playback by software decoding as shown in the video link > above actually lags but it does play fine.) > > I run the test streaming the video from a computer connected to the > LAN via 100Mbps ethernet. > All the test device are connected to the LAN via a b/g WIFI router. > I can confirm that there is absolutely no problem with my network > bandwidth and I can copy files from/to the computer to/from the > Android device using ftp (using File Expert Application) at > 16-24Mbps. > (I get the live transfer bandwidth by looking at the software running > at my computer which is monitoring my computer's network traffic.) > > I used the same mp4 test video encoded at different bitrate. > The resolution of the streaming video does not matter because I can > reproduce this using a 720x480 video as well. > All the Android devices I have tested suffer the same problem. > The Android STB suffers from this problem when video bitrate exceeds > about 10Mbps. > 7" Samsung Galaxy Tab suffers from this problem when video bitrate is > at or exceeds 6Mbps. > Nexus S suffers from this problem when video bitrate is at or exceeds > 3Mbps. > From these results, it is obvious that this is related to the Android > OS or the chip used. > > If the same video is being played locally from the device's SDcard, > there is no such buffering problem, even at several times the bitrate > compared to when it is streamed. > We have no idea what is going on here and are seeking solutions. > > I can perform more tests and report here if you can tell me what/how > to do the test as a non-programmer (I can't code). > However, from our test (or apparent in the video), it seems to me that > Android OS is dumping the buffer and then refilling it for no obvious > reason. > > This only occurs when hardware decoding was used. Software decoding > does not have any buffering problems. > This means the problem is definitely not related to bandwidth and most > likely related to hardware decoding buffering. > For lower bitrate video, we do not see this problem at all. > We are also interested to hire developers who can fix this problem for > us, preferably at the application but fixing this at the OS level is > also fine.. > > Please e-mail me directly if you are capable of fixing this problem > and available for hire. > Otherwise, please provide your opinion on this issue. > (I have searched online but did not see anyone encountering this > problem. Maybe because no one have tried streaming such high bitrate > video yet..) > > Thanks > Eric -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
