One of the older native codecs in Avid, the Meridien motion-JPEG (MJPEG) codec, can be read by the FFmpeg utility and, therefore, converted into other more popular codecs and wrappers. However, there is a caveat concerning the luminance levels.<\/p>\n
Meridien MJPEG files, whether wrapped as MXF or OMF, are signalled as full-range (0 \u2013 255) files, but in fact they contain limited range (16 \u2013 235) data, leaving room for super-white and super-black excursions. Their pixel format is read as yuvj422p but, in conversion to the usual yuv420p used for most consumer-oriented formats, the range is reduced yet again. So, this must be prevented.<\/p>\n
Remember also that Avid’s Meridien files contain 16 blank lines at the top for VBI information. These need to be cropped.<\/p>\n
There is a simple solution, using FFmpeg’s scaler. For SD 576-line files (“PAL” standard), include, early in the video filter chain, this:<\/p>\n
For 480-line (“NTSC” standard) files, use this:<\/p>\n A full command line to convert a UK television picture might be:<\/p>\n One of the older native codecs in Avid, the Meridien motion-JPEG (MJPEG) codec, can be read by the FFmpeg utility and, therefore, converted into other more popular codecs and wrappers. However, there is a caveat concerning the luminance levels. Meridien MJPEG files, whether wrapped as MXF or OMF, are signalled as full-range (0 \u2013 255) … Continue reading Converting Avid Meridien MJPEG media with FFmpeg<\/span> scale=src_range=0:dst_range=1,crop=x=0:y:16:w=720:h=576<\/code><\/p>\nscale=src_range=0:dst_range=1,crop=x=0:y=16:w=720:h=480<\/code><\/p>\n$ ffmpeg -i VIDEO.mxf -i AUDIO.wav -vcodec libx264 -acodec libfdk_aac -vf scale=src_range=0:dst_range=1,crop=x=0:y=16:w=720:h=576,setdar=16\/9 -aspect 16:9 VIDEO-AND-AUDIO-H264.mkv<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"