On Wed, 2 Oct 2013 11:44:40 +0200, Adam <[email protected]> wrote: > I have an image set (over 900 PNGs) that I want to merge into FLV > (preserving the transparency). All these images contain a colored character > and a transparent background behind it. > I've been searching on Google and other places and the best result I got is > a working movie, with a black background. > > The command I've been trying: > avconv -r 24 -i HippoBingo_B_Render_%04d.png -i music.wav -r 24 -ac 1 > -vcodec flv -strict experimental -s 256x384 -ab 128k z.flv > > console output: > > adam@ubuntu:~/render$ avconv -r 24 -i HippoBingo_B_Render_%04d.png -i > music.wav -r 24 -ac 1 -vcodec flv -strict experimental -s 256x384 -ab 128k > z.flv > avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav > developers > built on Mar 30 2013 22:20:06 with gcc 4.7.2 > Input #0, image2, from 'HippoBingo_B_Render_%04d.png': > Duration: 00:00:34.16, start: 0.000000, bitrate: N/A > Stream #0.0: Video: png, bgra, 400x600, 24 fps, 24 tbr, 24 tbn, 24 tbc > [wav @ 0x1ba8840] max_analyze_duration reached > Input #1, wav, from 'music.wav': > Duration: 00:00:32.66, bitrate: 1412 kb/s > Stream #1.0: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s > File 'z.flv' already exists. Overwrite ? [y/N] y > Incompatible pixel format 'bgra' for codec 'flv', auto-selecting format > 'yuv420p' > [buffer @ 0x21091a0] w:400 h:600 pixfmt:bgra > [scale @ 0x211fda0] w:400 h:600 fmt:bgra -> w:256 h:384 fmt:yuv420p > flags:0x4 > Output #0, flv, to 'z.flv': > Metadata: > encoder : Lavf53.21.1 > Stream #0.0: Video: flv, yuv420p, 256x384, q=2-31, 200 kb/s, 1k tbn, 24 > tbc > Stream #0.1: Audio: adpcm_swf, 44100 Hz, 1 channels, s16, 176 kb/s > Stream mapping: > Stream #0:0 -> #0:0 (png -> flv) > Stream #1:0 -> #0:1 (pcm_s16le -> adpcm_swf) > Press ctrl-c to stop encoding > frame= 820 fps=198 q=2.0 Lsize= 1776kB time=32.69 bitrate= 445.1kbits/s > > video:1046kB audio:706kB global headers:0kB muxing overhead 1.376779% > adam@ubuntu:~/render$ avconv -r 24 -i HippoBingo_B_Render_%04d.png -i > music.wav -r 24 -ac 1 -vcodec flv -strict experimental -s 256x384 -ab 128k > z.flv > avconv version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav > developers > built on Mar 30 2013 22:20:06 with gcc 4.7.2 > Input #0, image2, from 'HippoBingo_B_Render_%04d.png': > Duration: 00:00:34.16, start: 0.000000, bitrate: N/A > Stream #0.0: Video: png, bgra, 400x600, 24 fps, 24 tbr, 24 tbn, 24 tbc > [wav @ 0x1ba8840] max_analyze_duration reached > Input #1, wav, from 'music.wav': > Duration: 00:00:32.66, bitrate: 1412 kb/s > Stream #1.0: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s > File 'z.flv' already exists. Overwrite ? [y/N] y > Incompatible pixel format 'bgra' for codec 'flv', auto-selecting format > 'yuv420p' > [buffer @ 0x21091a0] w:400 h:600 pixfmt:bgra > [scale @ 0x211fda0] w:400 h:600 fmt:bgra -> w:256 h:384 fmt:yuv420p > flags:0x4 > Output #0, flv, to 'z.flv': > Metadata: > encoder : Lavf53.21.1 > Stream #0.0: Video: flv, yuv420p, 256x384, q=2-31, 200 kb/s, 1k tbn, 24 > tbc > Stream #0.1: Audio: adpcm_swf, 44100 Hz, 1 channels, s16, 176 kb/s > Stream mapping: > Stream #0:0 -> #0:0 (png -> flv) > Stream #1:0 -> #0:1 (pcm_s16le -> adpcm_swf) > Press ctrl-c to stop encoding > frame= 820 fps=198 q=2.0 Lsize= 1776kB time=32.69 bitrate= 445.1kbits/s > > video:1046kB audio:706kB global headers:0kB muxing overhead 1.376779% > > > > > Why do I get a black background? >
Because the flv codec simply does not support transparency. You need to use some different codec for that. -- Anton Khirnov _______________________________________________ libav-api mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-api
