Changes between Initial Version and Version 1 of Ticket #10418


Ignore:
Timestamp:
Jun 15, 2023, 12:49:21 PM (3 years ago)
Author:
Michael Koch
Comment:

Legend:

Unmodified
Added
Removed
Modified

  • Ticket #10418 – Description

    initial v1  
    1 There is a problem with a ASI178MM (monochrome) camera and its
    2 DirectShow driver. When I check the options with this command
     1There is a problem with a ASI178MM (monochrome) camera and its DirectShow driver. When I check the options with this command
    32
    43ffmpeg -list_options 1 -f dshow -i video="ASI178MM Camera (ZWO Design)"
    … …  
    65I get this output:
    76
    8 [dshow @ 00000203f5b315c0]   pixel_format=rgb8  min s=3096x2080
    9 fps=1.0842e-12 max s=3096x2080 fps=30
    10 [dshow @ 00000203f5b315c0]   pixel_format=rgb8  min s=1280x960
    11 fps=1.0842e-12 max s=1280x960 fps=30
    12 [dshow @ 00000203f5b315c0]   pixel_format=rgb8  min s=1280x800
    13 fps=1.0842e-12 max s=1280x800 fps=30
     7[dshow @ 00000203f5b315c0]   pixel_format=rgb8  min s=3096x2080 fps=1.0842e-12 max s=3096x2080 fps=30
     8[dshow @ 00000203f5b315c0]   pixel_format=rgb8  min s=1280x960 fps=1.0842e-12 max s=1280x960 fps=30
     9[dshow @ 00000203f5b315c0]   pixel_format=rgb8  min s=1280x800 fps=1.0842e-12 max s=1280x800 fps=30
    1410...  (there are more sizes listed, all with the same pixel format rgb8)
    1511
    1612When FFmpeg gets a frame from the camera, the detected pixel format is rgb8 (as defined in FFmpeg: 2 bits red, 3 bits green, 3 bits blue). Of course that's wrong, because it's a monochrome camera and the data is 8-bit gray.
    1713
    18 My first idea was that it must be a bug in the DirectShow driver. The
    19 data is obviously correct 8-bit gray (I did verify that), but it's incorrectly labeled as "rgb8" instead of "gray".
     14My first idea was that it must be a bug in the DirectShow driver. The data is obviously correct 8-bit gray (I did verify that), but it's incorrectly labeled as "rgb8" instead of "gray".
    2015
    2116When you look at the specifications of DirectShow