Hi, is there a way to mux an mxf file only containing a pcm audio stream? When I try I get this: ffmpeg -i /Users/krueger/lesspain/samples/software/compressor/compressor4_1080_25p_apple_devices_best_compat_2s.m4v -vn -c:a pcm_s16le ~/tmp/ffmpeg_pcm16_rewrap.mxf ffmpeg version git-2017-06-12-358ddb4 Copyright (c) 2000-2017 the FFmpeg developers built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn) configuration: --enable-shared --disable-static --disable-doc --disable-devices --enable-indev=lavfi --prefix=/Users/teamcity/buildAgent/work/3b1b1b1b725f407e/build/ffmpeg --install-name-dir='@rpath' --extra-cflags=-I/Users/teamcity/buildAgent/work/3b1b1b1b725f407e/build/libmp3lame/include/ --extra-ldflags=-L/Users/teamcity/buildAgent/work/3b1b1b1b725f407e/build/libmp3lame/lib/ --extra-cflags=-I/Users/teamcity/buildAgent/work/3b1b1b1b725f407e/build/libogg/include/ --extra-ldflags=-L/Users/teamcity/buildAgent/work/3b1b1b1b725f407e/build/libogg/lib/ --extra-cflags=-I/Users/teamcity/buildAgent/work/3b1b1b1b725f407e/build/libvorbis/include/ --extra-ldflags=-L/Users/teamcity/buildAgent/work/3b1b1b1b725f407e/build/libvorbis/lib/ --extra-ldflags='-Wl,-rpath,@loader_path/../lib' --enable-libvorbis --enable-libvpx --enable-libmp3lame --enable-libopenh264 --enable-libfreetype libavutil 55. 63.100 / 55. 63.100 libavcodec 57. 98.100 / 57. 98.100 libavformat 57. 73.100 / 57. 73.100 libavdevice 57. 7.100 / 57. 7.100 libavfilter 6. 91.100 / 6. 91.100 libswscale 4. 7.101 / 4. 7.101 libswresample 2. 8.100 / 2. 8.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/krueger/lesspain/samples/software/compressor/compressor4_1080_25p_apple_devices_best_compat_2s.m4v': Metadata: major_brand : M4V minor_version : 1 compatible_brands: M4V M4A mp42isom creation_time : 2015-09-15T08:19:57.000000Z Duration: 00:00:02.00, start: 0.000000, bitrate: 3881 kb/s Stream #0:0(deu): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 63 kb/s (default) Metadata: creation_time : 2015-09-15T08:19:57.000000Z handler_name : Core Media Audio Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 960x540 [SAR 1:1 DAR 16:9], 3807 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc (default) Metadata: creation_time : 2015-09-15T08:19:57.000000Z handler_name : Core Media Video Stream mapping: Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help [mxf @ 0x7f8ccd803200] there must be exactly one video stream and it must be the first one Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted Error initializing output stream 0:0 -- Conversion failed! Is this a conscious limitation of the muxer or am I missing a command line option? Thanks, Robert