[FFmpeg-trac] #1728(undetermined:new): Alpha gets destroyed when transcoding Prores4444 to Prores4444
FFmpeg
trac at avcodec.org
Wed Sep 12 14:18:47 CEST 2012
#1728: Alpha gets destroyed when transcoding Prores4444 to Prores4444
-------------------------------------+-------------------------------------
Reporter: rmk | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
I made a transparent PNG using Gimp, imported that into a Final Cut Pro 7
project and put it on a sequence configured to use Prores4444 as codec and
exported the file which resulted in a one-frame Prores4444 file. I then
verified that the resulting file still had the transparency by using it as
an overlay in Final Cut.
I then transcoded the file to Prores4444 again, this time using ffmpeg.
Importing that video into Final Cut Pro and used that as an overlay which
did not work (i.e. transparency was gone).
Command line used (current ffmpeg with a patch Carl sent me on the ML
today):
ffmpeg -i ~/testdata/video/finalcut-
output/prores4444_with_transparency.mov -vcodec prores_kostya -pix_fmt
yuv444p10le -acodec copy
~/tmp/prores4444_with_transparency_ffmpeg_patched.mov
ffmpeg version N-44391-gf9dd2e5 Copyright (c) 2000-2012 the FFmpeg
developers
built on Sep 12 2012 12:09:31 with gcc 4.2.1 (GCC) (Apple Inc. build
5664)
configuration:
libavutil 51. 72.100 / 51. 72.100
libavcodec 54. 55.100 / 54. 55.100
libavformat 54. 26.101 / 54. 26.101
libavdevice 54. 2.100 / 54. 2.100
libavfilter 3. 16.103 / 3. 16.103
libswscale 2. 1.101 / 2. 1.101
libswresample 0. 15.100 / 0. 15.100
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/krueger/testdata/video
/finalcut-output/prores4444_with_transparency.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2012-09-12 08:48:56
Duration: 00:00:00.04, start: 0.000000, bitrate: 43461 kb/s
Stream #0:0(eng): Video: prores (ap4h / 0x68347061), yuv444p10le,
1920x1080, 40697 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc
Metadata:
creation_time : 2012-09-12 08:48:56
handler_name : Apple Alias Data Handler
timecode : 01:00:00:00
Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz,
stereo, s16, 1536 kb/s
Metadata:
creation_time : 2012-09-12 08:48:56
handler_name : Apple Alias Data Handler
Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
Metadata:
creation_time : 2012-09-12 08:48:57
handler_name : Apple Alias Data Handler
timecode : 01:00:00:00
Output #0, mov, to
'/Users/krueger/tmp/prores4444_with_transparency_ffmpeg_patched.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
encoder : Lavf54.26.101
Stream #0:0(eng): Video: prores (ap4h / 0x68347061), yuv444p10le,
1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Metadata:
creation_time : 2012-09-12 08:48:56
handler_name : Apple Alias Data Handler
timecode : 01:00:00:00
Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz,
stereo, 1536 kb/s
Metadata:
creation_time : 2012-09-12 08:48:56
handler_name : Apple Alias Data Handler
Stream mapping:
Stream #0:0 -> #0:0 (prores -> prores_kostya)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=0.0 Lsize= 141kB time=00:00:00.04
bitrate=28897.2kbits/s
video:132kB audio:8kB subtitle:0 global headers:0kB muxing overhead
1.286356%
I'll attach the Prores4444 file generated Final Cut Pro and the PNG used
to create the video. If it would be more convenient for debugging this to
have a video with a specific setup (e.g. smaller frame size, a specific
pattern or color distribution), don't hesitate to tell me and I will
produce it.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1728>
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