#1280: Loss of alpha with yadif filter (bgra->yuv420 conv inserted instead of
bgra->yuva444p)
------------------------------------+------------------------------------
Reporter: ronag | Owner:
Type: defect | Status: open
Priority: normal | Component: avfilter
Version: git-master | Resolution:
Keywords: lavfi | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
------------------------------------+------------------------------------
Changes (by cehoyos):
* status: new => open
* version: unspecified => git-master
* component: undetermined => avfilter
* reproduced: 0 => 1
Comment:
I suspect this is also related to ticket #1080 (which is why -vf
format=yuva444p,yadif without -pix_fmt is not sufficient).
{{{
$ ffmpeg -loop 1 -i out.png -vcodec qtrle -vf yadif=1:-1 -pix_fmt rgba
-vframes 1 out.mov
ffmpeg version N-40448-g16b9156 Copyright (c) 2000-2012 the FFmpeg
developers
built on May 7 2012 10:12:51 with gcc 4.3.2
configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl --enable-
libspeex --enable-libopenjpeg --extra-ldflags=-lm --enable-libmp3lame
--enable-libvpx --enable-libxavs --enable-libtheora --enable-libvorbis
libavutil 51. 49.100 / 51. 49.100
libavcodec 54. 19.100 / 54. 19.100
libavformat 54. 4.100 / 54. 4.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 72.104 / 2. 72.104
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 11.100 / 0. 11.100
libpostproc 52. 0.100 / 52. 0.100
Input #0, image2, from 'out.png':
Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
Stream #0:0: Video: png, rgba, 720x576, 25 fps, 25 tbr, 25 tbn, 25 tbc
Incompatible pixel format 'rgba' for codec 'qtrle', auto-selecting format
'argb'
[buffer @ 0x8ff5960] w:720 h:576 pixfmt:rgba tb:1/1000000 sar:0/1
sws_param:flags=2
[yadif @ 0x8fee0e0] mode:1 parity:-1 auto_enable:0
[buffersink @ 0x8fedc60] auto-inserting filter 'auto-inserted scale 0'
between the filter 'Parsed_yadif_0' and the filter 'out'
[yadif @ 0x8fee0e0] auto-inserting filter 'auto-inserted scale 1' between
the filter 'src' and the filter 'Parsed_yadif_0'
[scale @ 0x8fee000] w:720 h:576 fmt:rgba sar:0/1 -> w:720 h:576
fmt:yuv420p sar:0/1 flags:0x4
[swscaler @ 0x90442e0] No accelerated colorspace conversion found from
yuv420p to argb.
[swscaler @ 0x904cd80] No accelerated colorspace conversion found from
yuv420p to argb.
[swscaler @ 0x9055820] No accelerated colorspace conversion found from
yuv420p to argb.
[scale @ 0x8fee8a0] w:720 h:576 fmt:yuv420p sar:0/1 -> w:720 h:576
fmt:argb sar:0/1 flags:0x4
Output #0, mov, to 'out.mov':
Metadata:
encoder : Lavf54.4.100
Stream #0:0: Video: qtrle (rle / 0x20656C72), argb, 720x576, q=2-31,
200 kb/s, 25 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (png -> qtrle)
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=0.0 Lsize= 952kB time=00:00:00.04
bitrate=195027.4kbits/s dup=0 drop=1
video:952kB audio:0kB global headers:0kB muxing overhead 0.073377%
}}}
Workaround is to use -vf format=yuva444p,yadif=1:-1 (and -pix_fmt).
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1280#comment:4>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker
_______________________________________________
FFmpeg-trac mailing list
FFmpeg-trac@avcodec.org
http://avcodec.org/mailman/listinfo/ffmpeg-trac
