Ticket #1728 (closed enhancement: fixed)
Alpha channel in Prores4444 is not read
|Reported by:||rmk||Owned by:|
|Blocking:||Reproduced by developer:||yes|
|Analyzed by developer:||no|
Description (last modified by cehoyos) (diff)
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.
- Status changed from new to open
- Description modified (diff)
- Component changed from undetermined to avcodec
- Blocked By set to 1749
- Summary changed from Alpha gets destroyed when transcoding Prores4444 to Prores4444 to Alpha channel in Prores4444 is not read
- Priority changed from normal to wish
- Version changed from unspecified to git-master
- Keywords prores alpha added
- Type changed from defect to enhancement
- Reproduced by developer set