I'm pretty sure that ffmpeg.c can't do what I want. Very difficult to tell with functions that have too many for loops. I've started to write my own program using libav*, but I am struggling with the API. The encoder part is easy to get through, but tying it together with the stream and format context stuff is difficult without an API example.
Shane On Fri, Jan 21, 2011 at 4:04 AM, JULIAN GARDNER <[email protected]>wrote: > > > --- On Thu, 20/1/11, aviad rozenhek <[email protected]> wrote: > > > From: aviad rozenhek <[email protected]> > > Subject: Re: [libav-user] Dynamic Resolution Changing > > To: "Libav* user questions and discussions" <[email protected]> > > Date: Thursday, 20 January, 2011, 22:59 > > On Thu, Jan 20, 2011 at 05:26, Shane > > M. Walton <[email protected]>wrote: > > > > > Hello, > > > > > > I have created a libavdevice that can read in raw > > video frames from shared > > > memory, which allows me to run ffmpeg and benefit from > > all the features > > > built in. (I love this...) This works > > great for a known resolution that > > > is consistent. So my question is, can the > > application ffmpeg.c and the > > > format context and stream contexts used throughout > > react to a resolution > > > change determined in the libavdevice code? > > > > > > Ideally, the shared memory contains a description of > > the incoming frame, > > > and > > > when the description changes ffmpeg needs to be > > notified up stream to > > > recreate the video codec for the new resolution. > > This is that part I am > > > having trouble with. The AVInputFormat doesn't > > really provide a way to > > > modify the ost->st->codec and I doubt that I > > would want to modify that > > > directly... Is there a way to recreate the input > > stream context when > > > a AVInputFormat->read_packet() is called that would > > have the upstream parts > > > of ffmpeg recreate the codec or am I better off > > writing my own application > > > entirely? > > > > > > Here is the path of how I need things to work, the HD > > and SD video is > > > exclusive or not at the same time: > > > > > > Raw HD video -\ > > > > > SHM -> ffmpeg (via > > libavdevice) -> encode (h.264) -> > > > format (mpeg-ts) -> out... > > > Raw SD video -/ > > > > > > Thanks! > > > > > > Shane > > > > > > > that's something i'm very interested in as well, but in the > > case of MPEG-TS > > input. > > -- > > Aviad Rozenhek > > _______________________________________________ > > libav-user mailing list > > [email protected] > > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > > > > You might be interested in the conversation over at doom10 > > see http://doom10.org/index.php?topic=653.0 > > they are talking about this as well, it something that i am struggling with > in out IPTV encode subsystem. I cannot and have not been able to get ffmpeg > to take into account the dynamic res change which is something i need to get > working. > > if you have any ideas let me know > > joolz > > > > > _______________________________________________ > libav-user mailing list > [email protected] > https://lists.mplayerhq.hu/mailman/listinfo/libav-user > _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
