on 2020.04.17 09:02 -0400, [email protected] wrote: > Hi, > > > i have ffmpeg building successfully on osx (10.14.6; xcode 11.3.1), > > and am using the generated libraries in a personal video project i'm > > working on. now i'm ready to start thinking about implementing hardware > > decoding ... i tried adapting some of the code from hw_decode.c, but > > ran into runtime errors. thinking that it was my code that was at > > fault, i then compiled hw_decode by itself, but i get the same errors > > even there. is anyone aware of hw_decode.c not working on osx? > > The example's working fine for me. (I think... I don't know what kind of > format videotoolbox decodes to but if I squint and tilt my head a little the > hex dump looks like it might be raw pixel buffer bytes of some sort lol)
thanks ted for your reply. videotoolbox decodes to CMSampleBuffer, which is CoreMedia's generic buffer wrapper class. a couple levels down, it's probably a CVPixelBuffer. if it's working for you, i'd be curious to know what hardware and what os version you're running on, and what type of file you're feeding to hw_decode. > Did you read the readme in the folder the example is in? I'm wondering when > you say you compiled hw_decode by itself you literally mean just the compile > step using cc. originally, i just took some of the code from hw_decode.c and adapted it for use within my app. when i got the errors, my first thought was that i was doing something wrong, so i wanted to isolate that by just running the executable produced by compiling hw_decode.c as a standalone program from the commandline. i've built that a few different ways now (to be clear, these are successful compilations producing an executable program), but they all exhibit the same runtime errors (shown in my original message). as far as build methods, here's what i've tried so far: 1) build the hw_decode executable (a separate target in xcode), linking against the ffmpeg libraries built locally in an earlier project step. i know these libraries are generally functional, because i'm linking against them in my main application, and it works as expected (except for the hardware decoding). 2) build the executable linking against the precompiled libraries downloaded from https://ffmpeg.zeranoe.com/builds/. 3) build the examples "in-tree" (method 2 from the README you suggested). this again will link against the locally built libraries, similar to (1) above. here are some (i am assuming pertinent) excerpts from the output of the configure stage during these builds: > External libraries: > appkit coreimage zlib > avfoundation iconv > bzlib securetransport > > External libraries providing hardware acceleration: > audiotoolbox videotoolbox > > Libraries: > avcodec avformat swscale > avdevice avutil > avfilter swresample > > ... > > Enabled hwaccels: > h263_videotoolbox hevc_videotoolbox mpeg2_videotoolbox > h264_videotoolbox mpeg1_videotoolbox mpeg4_videotoolbox am i incorrect in assuming that one should be able to build the ffmpeg libs on osx with hardware decoding support for h264 and hevc? the hwaccel intro wiki page seems to suggest it should work ... thanks. _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
