Hello all,
I have been trying to write a decoder using libschroedinger for the last couple
of days. I used ffmpeg to generate a schroedinger encoded ogg video file with
no audio using an uncompressed avi video as input. My decoder parses the ogg
file pulling out an ogg_packet then decodes it, which all appears to work fine.
My first question is ffmpeg encoding using libschroedinger seems to force the
output to use the YUV420 colour space even when specifically requesting other
pixel formats using the ffmpeg -pix_fmt option. Looking at the schro_frame.h
file there appears to be indirect support for SCHRO_FRAME_FORMAT_ARGB which
would be the ideal format for my purposes; would you be able to explain what
indirect support actually implies here? It also appears schroedinger only
caters for three components (read: colour channels) so how is Alpha supported
in schroedinger / dirac? i.e. will I need to add the alpha support into
schroedinger myself or like other non-alpha codecs would I have to encode the
alpha in the luma component of a grayscale frame?
Finally when storing my frame data in the SCHRO_DECODER_OK state I find the
Schro_Frame occasionally contains NULL data. Meaning my conversion from YUV420
colour space to RGB cannot proceed for this frame. Is a null frame expected in
this way?
If anyone can provide a link to a dummy video file with expected schroedinger
state transitions that would be fantastic as I could prove my decoder code
against known working decoders.
Thanks for any and all help you can provide.
MarkH.
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