some codecs need / can use extradata like Huffman tables.
MJPEG: Huffman tables
rv10: additional flags
MPEG-4: global headers (they can be in the bitstream or here)
The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
than extradata_size to avoid problems if it is read with the bitstream reader.
The bytewise contents of extradata must not depend on the architecture or CPU endianness.
Must be allocated with the av_malloc() family of functions.
- encoding: Set/allocated/freed by libavcodec.
- decoding: Set/allocated/freed by user.
some codecs need / can use extradata like Huffman tables. MJPEG: Huffman tables rv10: additional flags MPEG-4: global headers (they can be in the bitstream or here) The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger than extradata_size to avoid problems if it is read with the bitstream reader. The bytewise contents of extradata must not depend on the architecture or CPU endianness. Must be allocated with the av_malloc() family of functions. - encoding: Set/allocated/freed by libavcodec. - decoding: Set/allocated/freed by user.