@chapter Bitstream Filters
 @c man begin BITSTREAM FILTERS
 

 When you configure your FFmpeg build, all the supported bitstream

 filters are enabled by default. You can list all available ones using
 the configure option @code{--list-bsfs}.
 
 You can disable all the bitstream filters using the configure option
 @code{--disable-bsfs}, and selectively enable any bitstream filter using
 the option @code{--enable-bsf=BSF}, or you can disable a particular
 bitstream filter using the option @code{--disable-bsf=BSF}.
 
 The option @code{-bsfs} of the ff* tools will display the list of
 all the supported bitstream filters included in your build.
 
 Below is a description of the currently available bitstream filters.
 
 @section aac_adtstoasc
 
 @section chomp
 
 @section dump_extradata
 
 @section h264_mp4toannexb
 
 @section imx_dump_header
 

 @section mjpeg2jpeg
 
 Convert MJPEG/AVI1 packets to full JPEG/JFIF packets.
 
 MJPEG is a video codec wherein each video frame is essentially a
 JPEG image. The individual frames can be extracted without loss,
 e.g. by
 
 @example
 ffmpeg -i ../some_mjpeg.avi -vcodec copy frames_%d.jpg
 @end example
 
 Unfortunately, these chunks are incomplete JPEG images, because
 they lack the DHT segment required for decoding. Quoting from
 @url{http://www.digitalpreservation.gov/formats/fdd/fdd000063.shtml}:
 
 Avery Lee, writing in the rec.video.desktop newsgroup in 2001,
 commented that "MJPEG, or at least the MJPEG in AVIs having the
 MJPG fourcc, is restricted JPEG with a fixed -- and *omitted* --
 Huffman table. The JPEG must be YCbCr colorspace, it must be 4:2:2,
 and it must use basic Huffman encoding, not arithmetic or
 progressive. . . . You can indeed extract the MJPEG frames and
 decode them with a regular JPEG decoder, but you have to prepend
 the DHT segment to them, or else the decoder won't have any idea
 how to decompress the data. The exact table necessary is given in
 the OpenDML spec."
 
 This bitstream filter patches the header of frames extracted from an MJPEG
 stream (carrying the AVI1 header ID and lacking a DHT segment) to
 produce fully qualified JPEG images.
 
 @example
 ffmpeg -i mjpeg-movie.avi -vcodec copy -vbsf mjpeg2jpeg frame_%d.jpg
 exiftran -i -9 frame*.jpg
 ffmpeg -i frame_%d.jpg -vcodec copy rotated.avi
 @end example
 

 @section mjpega_dump_header
 
 @section movsub
 
 @section mp3_header_compress
 
 @section mp3_header_decompress
 
 @section noise
 
 @section remove_extradata
 
 @c man end BITSTREAM FILTERS