Perfect. Best regards. In data mercoledì 30 agosto 2023 16:14:03 CEST, John Regan via Libav-user ha scritto: > On Wed, 30 Aug 2023 15:39:08 +0200 > > Denis Gottardello <[email protected]> wrote: > > Hi. When I try to compile the following line of code > > > > av_channel_layout_copy(&c->ch_layout, > > &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO); > > > > taken from mux.c example I obtain the error: > > > > /home/denis/Cpp/ffmpeg-6.0/libavutil/channel_layout.h:362: *error: > > taking address of rvalue [-fpermissive]* > > ../../ffmpeg-6.0/libavutil/channel_layout.h:362:5: error: taking > > address of rvalue [-fpermissive] 362 | { .order = > > AV_CHANNEL_ORDER_NATIVE, .nb_channels = (nb), .u = { .mask = (m) }} | > > > > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > ~~~~~~~~> > > ../../ffmpeg-6.0/libavutil/channel_layout.h:369:45: note: in > > expansion of macro ‘AV_CHANNEL_LAYOUT_MASK’ 369 | #define > > AV_CHANNEL_LAYOUT_STEREO AV_CHANNEL_LAYOUT_MASK(2, > > AV_CH_LAYOUT_STEREO) | > > ^~~~~~~~~~~~~~~~~~~~~~ ../ffmpegTest/main.cpp:157:65: note: in > > expansion of macro ‘AV_CHANNEL_LAYOUT_STEREO’ 157 | > > av_channel_layout_copy(&c->ch_layout, > > &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO); | > > > > ^~~~~~~~~~~~~~~~~~~~~~~~ > > > > How can I translate it to work in Windows, Linux and Mac? > > Something like this? > > > > AVChannelLayout a= AV_CHANNEL_LAYOUT_STEREO; > > av_channel_layout_copy(&c->ch_layout, &a); > > If you're assigning one of the standard layouts you should be able to > just do > > c->ch_layout = AV_CHANNEL_LAYOUT_STEREO; > > At least, assuming that the AVCodecContext has just been allocated > (like it is in mux.c). If you had an existing channel layout set, you'd > want to do a copy since that will free any custom channel layout data > for you. > > From your output it looks like you're compiling as C++, and some of the > code in mux.c is valid C code, but not valid C++ code (such as taking > the address of an rvalue). > _______________________________________________ > Libav-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/libav-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". -- +39.347.4070897 http://www.labcsp.com[1] http://www.denisgottardello.it[2] GMT+1 Skype: mrdebug
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