I noticed that Google have replaced OpenCore with Stagefright since Android 2.0. I know PV makes OpenCore but I have no idea who makes Stagefright.
I would like comment from someone working on Stagefright to tell me whether this high bitrate video streaming problem is related to Stagefright or not. However, I don't know who to ask when I don't know who makes Stagefright.. Anyone? On Mar 27, 4:21 pm, "Eric Wong (hdmp4.com)" <ericwon...@gmail.com> wrote: > Any developers here have any idea what theproblemis? > 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 streamvideofrom > > any LAN device (e.g. computer, Android phone/tablet, etc) to an > > Android device. > > > Recently, we encountered a very strangeproblemonbufferingand we > > believe the issue is possibly related to Android's platform/framework, > > i.e. lower level stuff. > > > Thisvideoshows theproblemwe 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 > > thevideo). > > > The issues is that when theSTREAMINGvideoexceeds a certainbitrate, > > thevideoeither 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 thevideoby software > > decoding instead of hardware decoding. Thevideowas able to play from > > start to the end without any problems. (due to slow CPU, arm11, > > 800mhz,videoplayback by software decoding as shown in thevideolink > > above actually lags but it does play fine.) > > > I run the teststreamingthevideofrom 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 noproblemwith 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 testvideoencoded at differentbitrate. > > The resolution of thestreamingvideodoes not matter because I can > > reproduce this using a 720x480videoas well. > > All the Android devices I have tested suffer the sameproblem. > > The Android STB suffers from thisproblemwhenvideobitrateexceeds > > about 10Mbps. > > 7" Samsung Galaxy Tab suffers from thisproblemwhenvideobitrateis > > at or exceeds 6Mbps. > > Nexus S suffers from thisproblemwhenvideobitrateis at or exceeds > > 3Mbps. > > From these results, it is obvious that this is related to the Android > > OS or the chip used. > > > If the samevideois being played locally from the device's SDcard, > > there is no suchbufferingproblem, even at several times thebitrate > > 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 thevideo), 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 anybufferingproblems. > > This means theproblemis definitely not related to bandwidth and most > > likely related to hardware decodingbuffering. > > For lowerbitratevideo, we do not see thisproblemat all. > > We are also interested to hire developers who can fix thisproblemfor > > 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 thisproblem > > 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 triedstreamingsuchhighbitrate > >videoyet..) > > > 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
