>-----Original Message-----
>From: Libav-user [mailto:[email protected]] On Behalf Of Carl
>Eugen Hoyos
>Sent: Montag, 29. August 2016 12:17
>To: This list is about using libavcodec, libavformat, libavutil, libavdevice
>and libavfilter.
>Subject: Re: [Libav-user] Writing 16bit greyscale videos
>
>>2016-08-29 10:59 GMT+02:00 Masneri, Stefano <[email protected]>:
>> I have a small class that creates an h264 video from a set of input images.
>> I have some problems trying to write 16 bit input images: Conversion
>> to yuv420p format loses 8 bit of precision, and apparently x264 does
>> not support encoding 16 bit greyscale data.
>
>H.264 does not support more than 14bit, x264 does not support more than 10bit
>input.
>
>> Do you know of a codec that supports encoding a video using
> >AV_PIX_FMT_GRAY16BE pixel format (or anything similar)?
>
>jpegls, png, tiff, dpx, sgi, ffvhuff, ffv1 (all lossless) Jpeg2000, but FFmpeg
>needs the external library libopenjpeg for encoding
>gray16 (lossy or lossless)
>
>Carl Eugen
Thanks Carl. I am able to create the video with 16 bit greyscale images, but
when I try watching the video in VLC I only see a green image. Reading the
frames one by one (with a simple class which uses FFmpeg) I see a strange
behaviour: every second column of the video is zero, while the other are
exactly as the input fed to the class that created the video. I guess there is
somewhere a problem switching from uint16 to uint8, but I cannot figure it out.
Any hints?
Here's the output of ffprobe
D:\Code\VisualStudio\FFmpegApps\Win\VideoWriterApp>ffprobe -i test16bit.avi
ffprobe version 2.8.6 Copyright (c) 2007-2016 the FFmpeg developers
built with gcc 5.3.0 (GCC)
configuration: --disable-static --enable-shared --enable-gpl
--enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib
--enable-fontconfig --ena
ble-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray
--enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype
--enable-
libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264
--enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma
--enable-decklink --enable-zlib
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, avi, from 'test16bit.avi':
Metadata:
encoder : Lavf56.40.101
Duration: 00:00:40.00, start: 0.000000, bitrate: 854 kb/s
Stream #0:0: Video: ffv1 (FFV1 / 0x31564646), gray16le, 720x576, 849 kb/s,
25 fps, 25 tbr, 25 tbn, 25 tbc
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