[Pymedia-users] video resolution issue

[DDaniel <da...@ga...>]

Hi,

I'm using pymedia to build a movie from pictures. I use a modified version
of the standard example given everywhere, with python2.4 and pymedia 1.3.7.3

The issue is that I can't choose the size of my movie. 
When I use a resolution of 640x480, it actually build a movie, but tend to
cut some part of my pictures(as they are 800x600).
If I try to build a 800x600 movie, it at first seems to build something, but
when I launch it, the player closes as soon as it opens without playing the
movie.

I get my encoder by calling     e = getEncoder("mpeg2video", 480, 640) with:
def getEncoder(outCodec, height, width):
    if outCodec== 'mpeg1video': bitrate= 2700000
    else                      : bitrate= 9800000
    #==
    params= { \
      'type': 0,
      'gop_size': 12,
      'frame_rate_base': 125,
      'max_b_frames': 0,
      'height': height,
      'width': width,
      'frame_rate': 2997,
      'deinterlace': 0,
      'bitrate': bitrate,
      'id': vcodec.getCodecID( outCodec )
    }
    return vcodec.Encoder( params )

then use this method:
def joinFrames(file_list, frame_size, encoder, file_dest):
    t= time.time()
    for img in file_list:
        add_one_frame(img, frame_size, encoder, file_dest)
    nb = len(file_list)
    print '%d frames written in %.2f secs( %.2f fps )' % ( nb, time.time()-
t, float( nb )/ ( time.time()- t ) )
    return file_dest

to eventually finish with this:


def add_one_frame(img, (h, w), encoder, file_dest):
#    print img
    assert h%2==0 , "height must be a multiple of 2" 
    assert w%2==0 , "width must be a multiple of 2" 
    s = pygame.image.load(img)
    ss = pygame.image.tostring(s, "RGB")
#    print "pygame stuff done"
    bmpFrame = vcodec.VFrame( vcodec.formats.PIX_FMT_RGB24, (w, h),
(ss,None,None))
#    print "bmpframe created"
    yuvFrame = bmpFrame.convert( vcodec.formats.PIX_FMT_YUV420P, (640,480) )
#    print "yuvframe created"
    d = encoder.encode( yuvFrame  )
    file_dest.write( d.data )


The issue seems to be here. If I understand well, Vframe.convert should get
the frame at the right size. It never does, yuvframe  always keeps having
the size of bmpFrame. And this way, a part of my picture is cut. I would
prefer to use another size for the movie, but when I change the size for the
encoder and the convert function, the movie doesn't work.
I haven't been able to find a solution to my problem, so I thought I could
maybe ask some help.
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