Rob- > I am using an iphone 4. I finally resorted to using the H264 decoder in > ffmeg (there is an iphone port available). > My test app decodes an H.264 movie while at the same time, encoding a raw > camera feed. I've just about got things to work - but my FPS for the > decoding (while encoding is going on) drops to around 7fps.... > While not encoding, its great. Ya I'm not surprised that encoding took a bite out of available CPU time. What is the resolution of your camera feed? -Jeff > On Mon, Dec 6, 2010 at 12:47 PM, Jeff Brower <jbrower at signalogic.com> wrote: > >> Dzmitry- >> >> > I said nothing about encoding, only about decoding. >> >> Ok. I think for single-channel H264 decode the ARM core is fine. My >> concern is with multiple concurrent decodes, for >> example video conference, and also encode. I think this will be too much >> for the ARM core. I can't figure out yet >> how to utilize the media (DSP) core, for example make API calls that >> offload the ARM. >> >> -Jeff >> >> > On 06.12.2010, at 8:58, Jeff Brower wrote: >> > >> >> Dzmitry- >> >> >> >>> Yes, we use x264 ( from http://www.videolan.org/developers/x264.html) >> >>> for decode h264. >> >> >> >> This is using the ARM core? I would think that using the ARM core >> instead of the media (DSP) core would overload >> >> the >> >> ARM and cut battery life. Maybe decode is more feasible, but encode is >> CPU intensive. >> >> >> >> -Jeff >> >> >> >>> On 04.12.2010, at 16:41, bo shi wrote: >> >>> >> >>>> Hi Dima, >> >>>> I learned that the iPhone sdk does not publish the H.264 codec API, >> >>>> so developer can not use hardware decoder to decode raw H.264 stream >> >>>> directly, how can you do that? You decode video in soft way? >> >>>> >> >>>> Thanks in advance! >> >>>> Bo >> >>>> >> >>>> >> >>>> On Saturday, December 4, 2010, Dzmitry Yablonski <grizlik at gmail.com> >> wrote: >> >>>>> Hello Rob >> >>>>> We have implemented video call with PjSip 1.8.5 on iPhone. >> >>>>> Best regards, Dima. >> >>>>> >> >>>>> >> >>>>> On 04.12.2010, at 15:26, Rob Wilkes wrote: >> >>>>> I also noticed that your roadmap says it will initially be for >> windows. My requirement is for iphone. I guess my >> >>>>> question is not really a PJSIP question, but rather to developers who >> may have used PJ to make video work on >> >>>>> iPhone >> >>>>> - just wanted to check if it is doable or impossible today due to >> some iphone restriction :) >> >>>>> >> >>>>> On Sat, Dec 4, 2010 at 8:42 AM, Rob Wilkes <wilkrob at gmail.com> >> wrote: >> >>>>> >> >>>>> Hi Benny, Yes, I know PJSIP also plans to support it - but for this >> project, I cannot wait for that update, so I >> >>>>> plan to do it myself. Since you may be ahead of me, I was curious if >> there are any restrictions in the iPhone >> >>>>> APIs >> >>>>> itself that will inhibit PJSIP (or any other stack) to not work with >> video. For example, it looks like I cannot >> >>>>> use >> >>>>> the Movie Player class as it expects a URL.For this to work, we will >> need frame/frame encode/decode and display >> >>>>> support on the iPhone. >> >>>>> >> >>>>> >> >>>>> thanks! >> >>>>> >> >>>>> On Fri, Dec 3, 2010 at 10:12 PM, Benny Prijono <bennylp at teluu.com> >> wrote: >> >>>>> >> >>>>> Hi, FYI we are also working on video and it is planned for the >> >>>>> upcoming 2.0 release. Have a look at our roadmap in the trac site. >> >>>>> >> >>>>> Best regards, >> >>>>> Benny >> >>>>> >> >>>>> >> >>>>> On Sat, Dec 4, 2010 at 3:51 AM, Rob Wilkes <wilkrob at gmail.com> >> wrote: >> >>>>>> Hi, I have started on an activity to get a basic Video call working >> on >> >>>>>> iPhone. It needs be be over RTP, preferably with H.264 codec. Has >> anyone >> >>>>>> written a video client with PJSIP specifically for the iphone? Are >> there any >> >>>>>> road blocks? ( I know PJSIP doesnt support video for now, but I plan >> to >> >>>>>> extend it - my question is more in the iPhone side). Prelim. >> analysis shows >> >>>>>> I can pass H.264 streams to the iphone media player framework and it >> can >> >>>>>> instantiate the appropriate player. My approximate plan is to send >> audio + >> >>>>>> video data using PJSIP, then extend PJSIP to support video decoding >> and pass >> >>>>>> the decoded H264 buffer to the media framework of iphone.
