[FFmpeg-trac] #7883(undetermined:new): Videos with alpha channel are corrupted by scaling
FFmpeg
trac at avcodec.org
Mon May 6 10:24:24 EEST 2019
#7883: Videos with alpha channel are corrupted by scaling
-------------------------------------+-------------------------------------
Reporter: Acru | Owner:
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: git-master | Resolution:
Keywords: scale alpha | Blocked By:
regression |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Comment (by Acru):
Replying to [comment:1 cehoyos]:
> Please provide the command line you tested together with the complete,
uncut console output to make this a valid ticket.
Here is the command with associated output;
{{{
>ffmpeg -i "Door (png).mov" -vf "scale=iw*0.5:-1" -y out.mp4
ffmpeg version N-93762-ge384f6f2f9 Copyright (c) 2000-2019 the FFmpeg
developers
built with gcc 8.3.1 (GCC) 20190414
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-
libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
--enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack
--enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
--enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-
libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
--enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx
--enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-
nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 52.100 / 58. 52.100
libavformat 58. 27.103 / 58. 27.103
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 50.100 / 7. 50.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Door (png).mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2013-04-07T21:58:25.000000Z
Duration: 00:00:10.04, start: 0.000000, bitrate: 314318 kb/s
Stream #0:0(eng): Video: png (png / 0x20676E70), rgba(pc), 1920x1080
[SAR 2834:2834 DAR 16:9], 314308 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k
tbc (default)
Metadata:
creation_time : 2013-04-07T21:58:26.000000Z
handler_name : Apple Video Media Handler
encoder : PNG
timecode : 00:00:00;00
Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
Metadata:
creation_time : 2013-04-07T22:03:42.000000Z
handler_name : Time Code Media Handler
timecode : 00:00:00;00
Stream mapping:
Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0000000000575b00] using SAR=1/1
[libx264 @ 0000000000575b00] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2
[libx264 @ 0000000000575b00] profile High 4:4:4 Predictive, level 3.1,
4:4:4, 8-bit
[libx264 @ 0000000000575b00] 264 - core 157 r2970 5493be8 - H.264/MPEG-4
AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html -
options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7
psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1
8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=12
lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0
bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25
scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0
qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'out.mp4':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
encoder : Lavf58.27.103
Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuv444p,
960x540 [SAR 1:1 DAR 16:9], q=-1--1, 0.03 fps, 30k tbn, 29.97 tbc
(default)
Metadata:
creation_time : 2013-04-07T21:58:26.000000Z
handler_name : Apple Video Media Handler
timecode : 00:00:00;00
encoder : Lavc58.52.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame= 19 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A
speed= 0x
frame= 43 fps= 43 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A
speed= 0x
frame= 61 fps= 40 q=29.0 size= 0kB time=00:00:00.06 bitrate=
6.2kbits/s speed=0.0441x
frame= 81 fps= 40 q=29.0 size= 0kB time=00:00:00.73 bitrate=
0.6kbits/s speed=0.363x
frame= 99 fps= 39 q=29.0 size= 0kB time=00:00:01.33 bitrate=
0.3kbits/s speed=0.525x
frame= 118 fps= 38 q=29.0 size= 0kB time=00:00:01.96 bitrate=
0.2kbits/s speed=0.64x
frame= 139 fps= 38 q=29.0 size= 0kB time=00:00:02.66 bitrate=
0.2kbits/s speed=0.734x
frame= 160 fps= 39 q=29.0 size= 0kB time=00:00:03.37 bitrate=
0.1kbits/s speed=0.811x
frame= 178 fps= 38 q=29.0 size= 0kB time=00:00:03.97 bitrate=
0.1kbits/s speed=0.852x
frame= 196 fps= 38 q=29.0 size= 0kB time=00:00:04.57 bitrate=
0.1kbits/s speed=0.886x
frame= 215 fps= 38 q=29.0 size= 0kB time=00:00:05.20 bitrate=
0.1kbits/s speed=0.919x
frame= 236 fps= 38 q=29.0 size= 0kB time=00:00:05.90 bitrate=
0.1kbits/s speed=0.953x
frame= 256 fps= 38 q=29.0 size= 256kB time=00:00:06.57 bitrate=
319.1kbits/s speed=0.978x
frame= 275 fps= 38 q=29.0 size= 256kB time=00:00:07.20 bitrate=
291.0kbits/s speed=0.996x
frame= 296 fps= 38 q=26.0 size= 256kB time=00:00:07.90 bitrate=
265.2kbits/s speed=1.02x
frame= 301 fps= 38 q=-1.0 Lsize= 371kB time=00:00:09.94 bitrate=
305.3kbits/s speed=1.24x
video:366kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 1.288334%
[libx264 @ 0000000000575b00] frame I:2 Avg QP:19.38 size: 43754
[libx264 @ 0000000000575b00] frame P:105 Avg QP:20.74 size: 1575
[libx264 @ 0000000000575b00] frame B:194 Avg QP:23.80 size: 624
[libx264 @ 0000000000575b00] consecutive B-frames: 9.6% 12.6% 2.0% 75.7%
[libx264 @ 0000000000575b00] mb I I16..4: 23.3% 53.5% 23.2%
[libx264 @ 0000000000575b00] mb P I16..4: 2.5% 0.8% 0.1% P16..4:
17.5% 2.5% 1.1% 0.0% 0.0% skip:75.5%
[libx264 @ 0000000000575b00] mb B I16..4: 0.6% 0.1% 0.0% B16..8:
14.5% 0.4% 0.0% direct: 0.1% skip:84.3% L0:45.3% L1:54.1% BI: 0.6%
[libx264 @ 0000000000575b00] 8x8 transform intra:30.0% inter:98.3%
[libx264 @ 0000000000575b00] coded y,u,v intra: 32.3% 2.4% 1.2% inter:
3.7% 0.0% 0.0%
[libx264 @ 0000000000575b00] i16 v,h,dc,p: 1% 89% 0% 10%
[libx264 @ 0000000000575b00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 38% 15%
5% 5% 5% 7% 5% 7%
[libx264 @ 0000000000575b00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 65% 8%
2% 2% 2% 3% 2% 3%
[libx264 @ 0000000000575b00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000000000575b00] ref P L0: 53.6% 13.1% 20.8% 12.5%
[libx264 @ 0000000000575b00] ref B L0: 86.0% 11.6% 2.4%
[libx264 @ 0000000000575b00] ref B L1: 96.1% 3.9%
[libx264 @ 0000000000575b00] kb/s:297.89
}}}
Like I said in the OP though, the log doesn't indicate any problem but the
video output is bad;
[[Image(https://www.dropbox.com/s/vxx2jzd7lob7k7o/out.mp4_snapshot_00.09_%5B2019.05.06_01.21.57%5D.png?raw=1)]]
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7883#comment:2>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
More information about the FFmpeg-trac
mailing list