Can we run this with out needing ARDdrone? On Wed, Jul 24, 2013 at 8:22 AM, <tmur...@wumpus-cave.net> wrote:
> Short on time at the moment, but I have the complete code on a github repo: > > https://github.com/frezik/UAV-**Pilot<https://github.com/frezik/UAV-Pilot> > > The relevant code is in UAV::Pilot::SDL::Video, and the decoding happens > in the xs file for UAV::Pilot::Video::**H264Decoder. The test > t/160_video_decode.t should run the decoding end of things. There's a test > video in t_data/ardrone_video_stream_**dump.bin, though that contains the > PaVE headers from the UAV before each frame. Those headers can be stripped > out by bin/uav_video_dump. > > I'll try to come up with a more concise example later this evening. > > Thanks, > Timm > > > On 24.07.2013 01:00, Tobias Leich wrote: > >> Hi, can you paste a complete example please? Maybe with a link to a test >> video file. >> >> What I would try first is SDL's latest release, which is 2.540 or so. >> >> Cheers, FROGGS >> >> Am 23.07.2013 23:44, schrieb tmur...@wumpus-cave.net: >> >>> I'm working on a project involving decoding h.264 video frames with >>> ffmpeg and then outputting them to an SDL surface. From what I've >>> read, the YUV overlay is meant for this kind of job, but I'm having >>> trouble getting it to work with the Perl bindings. >>> >>> One thing that seems odd to me in the Perl docs is: >>> >>> As of release 2.3 direct right to overlay is disable. >>> >>> Besides the typos, this troubles me because it seems that disabling >>> the feature makes the YUV overlay completely useless. >>> >>> Not to be deterred, I wrote this code: >>> >>> SDL::Video::lock_YUV_overlay( $overlay ); >>> # The order of array indexen is correct, according to: >>> # >>> http://dranger.com/ffmpeg/**tutorial02.html<http://dranger.com/ffmpeg/tutorial02.html> >>> my $pitches = $overlay->pitches; >>> $$pitches[0] = scalar @{ $last_vid_frame[0] }; >>> $$pitches[2] = scalar @{ $last_vid_frame[1] }; >>> $$pitches[1] = scalar @{ $last_vid_frame[2] }; >>> my $pixels = $overlay->pixels; >>> $$pixels[0] = $last_vid_frame[0]; >>> $$pixels[2] = $last_vid_frame[1]; >>> $$pixels[1] = $last_vid_frame[2]; >>> SDL::Video::unlock_YUV_**overlay( $overlay ); >>> >>> SDL::Video::update_rects( $sdl, $bg_rect ); >>> SDL::Video::display_YUV_**overlay( $sdl, $bg_rect ); >>> >>> When I run this, I get an error about not being able to find the >>> pitches() method against the class "SDL::Overlay". Eh? (Same thing >>> happens for the pixels() method if I put that call first.) I can call >>> width() and format() and such just fine on that object. >>> >>> If needed, I can handle the overlay entirely at the C level. I may >>> end up doing that anyway; the C array that comes out of ffmpeg is >>> being transformed into a Perl array-of-arrays, which is going to be an >>> expensive operation to do for 720p at 30 fps in realtime. But I'd like >>> to try this at the Perl level for now. >>> >>> I might also have to convert the output from ffmpeg using >>> sws_scale(). It's coming out in YUV420P mode, and I'm using YV12 to >>> init the overlay. But I'd like to get the above working before messing >>> with that. >>> >>> Thanks, >>> Timm Murray >>> >> >
