Le nonidi 19 thermidor, an CCXXV, John Warburton a écrit : > Gentlemen, I am sorry to report that this particular patch to > lavfi/vf_stack.c breaks FFmpeg on-screen output when a vertical stack > (vstack) follows a horizontal stack (hstack). Below, please find a > chain to -filter_complex, cut down from a much more complex chain, > that reproduces the problem. > > FFmpeg here is compiled for Windows using mingw-w64 tool chain on Bash > for Windows. I usually make this up nearly every day without incident. > > At commit 4e0e9ce2dc67a94c98d40a46e91fe5aa53ad0376 ("lavfi/framesync2: > implement "activate" design"), the following script downloads an audio > stream, and successfully produces three visual representations using > FFmpeg filters, output to the 'SDL' device. 'opengl' also works. > > In this script, the avectorscope and showfreqs filters are > horizontally stacked; then this combination is stacked vertically with > an output from the ebur128 filter. > > ffmpeg -v debug -i 'http://s3.yesstreaming.net:7001/;stream/' > -filter_complex "[a0]asplit=3[a][b][c]; > [a]avectorscope=size=512x512[z]; [b]showfreqs[y]; [z][y]hstack[n]; > [c]ebur128=video=1[d][e]; [d]scale=1536:512[g]; [n][g]vstack; > [e]anullsink" -f SDL Test > > But once the patch to lavfi_vf_stack is applied, at commit > 0dd8320e16bcdbe6b928e99489cf47abd16d3255, the same script results in a > blank, white display window using the SDL device, and a blank black > window using opengl. The text output from the ebur128 filter stops > after one line. Merely applying a single hstack or vstack works: but > the two together fail after this point: > > https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/0dd8320e16bcdbe6b928e99489cf47abd16d3255 > ("lavfi/vf_stack: move to "activate" design") > > Furthermore, compiling from today's git master but reversing ONLY the > above patch to vf_stack.c also results in a working FFmpeg when given > the above test case.
I can reproduce the issue here. Thanks for the report. Regards, -- Nicolas George
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