#2290: Apparently wrong bitdepth set for RGBA PNG in mov
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Reporter: rmk | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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I transcoded an PNG(RGBA)-Mov sample again into PNG(RGBA)-Mov and the
resulting file is displayed as RGBA and when I export a png frame from
the resulting file, transparency is still there. However, when using
the ffmpeg-generated file in Final Cut, transparency is gone (works
with original). Comparing the atom structure I saw that the
ffmpeg-generated file has a depth of 24 in the stsd atom, while the
original file has 32. Changing the value to 32 in the atom makes FCP
work with the file as expected.
When I just remux the file, 32 is preserved.
command line and output:
ffmpeg -i in.mov -vcodec png out.mov
ffmpeg version N-50095-gb9237aa Copyright (c) 2000-2013 the FFmpeg
developers
built on Feb 20 2013 12:09:22 with llvm-gcc 4.2.1 (LLVM build
2336.11.00)
configuration:
libavutil 52. 17.102 / 52. 17.102
libavcodec 54. 92.100 / 54. 92.100
libavformat 54. 63.100 / 54. 63.100
libavdevice 54. 3.103 / 54. 3.103
libavfilter 3. 38.103 / 3. 38.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'in.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf54.63.100
Duration: 00:00:00.04, start: 0.000000, bitrate: 10307 kb/s
Stream #0:0(eng): Video: png (png / 0x20676E70), rgba, 1920x1080
[SAR 1:1 DAR 16:9], 10162 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc
Metadata:
handler_name : DataHandler
Output #0, mov, to 'out.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf54.63.100
Stream #0:0(eng): Video: png (png / 0x20676E70), rgba, 1920x1080
[SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 12800 tbn, 25 tbc
Metadata:
handler_name : DataHandler
Stream mapping:
Stream #0:0 -> #0:0 (png -> png)
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=0.0 Lsize= 50kB time=00:00:00.04
bitrate=10307.4kbits/s
video:50kB audio:0kB subtitle:0 global headers:0kB muxing overhead
1.428824%
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2290>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker
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