lavfi: avectorscope filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>
lavfi/select: set forgotten VAR_PICT_TYPE_BI

Signed-off-by: Paul B Mahol <onemda@gmail.com>
id3v2enc: chapter support

Signed-off-by: Paul B Mahol <onemda@gmail.com>
id3v2: read all chapter subframes

Signed-off-by: Paul B Mahol <onemda@gmail.com>