I'm at the tail end of a gruelling render of a six-episode TV series.
The end product is a series of MXF files, rendered at 35mbps, 1440x1080, 60i. These are the files I'm submitting to the broadcaster.
The video portion of these master files is encoded with mpeg2, with uncompressed 16/48 audio.
I'm thinking there must be some kind of simple solution for lifting the audio & video out of the mxf wrapper so I can put author these to a Blu-Ray disc without more rendering or converting. After all, BR wants a high-bitrate mpeg2 -- I have a high-bitrate mpeg2, but in an mxf wrapper.
To answer the inevitable "why?" -- the MXF files are for the broadcaster, but I'd like to have playable BR to share the show with the crew and talent.
Thoughts?
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Last edited by bigass; 10th Mar 2014 at 14:27.
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Looking at this site's "what is blu-ray" article, I think I'm out of luck. Under "Video frame size" it says "1440x1080x59.94i, 50i (16:9) AVC / VC-1 only."
So, looks like a re-render's in my future. -
From what I read of "BD Demystified", MP@H1440L @59.94 MPEG2 is a valid profile. Of course, there are other requisites to that (VBV, GOP, colorspace etc)
Scott -
That's outdated information from an early BD draft specification white paper (2005), and baldrick should update it
You can check directly from the bd association, the revised version shows the change
Common modern authoring programs (e.g. encore, dvda) allow it as well -
Thanks, Cornucopia. Other guides I've searched also said mpeg2 was ok for that resolution.
When I get back to the studio, I'll post the mediainfo assessment and someone can nix or greenlight my quest.
If it saves any time, the files were rendered from Sony Vegas 12 with its MXF template, 35mbps, quality slider at 25 (out of 31). Vegas doesn't offer other options on that one. -
If it's using a XDCAM-EX preset then it will be 35Mb/s MPEG2 and BD compliant
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Here's what MediaInfo tells me about the file:
Code:General Complete name : L:\TCW on Eastlink - S01 masters\TCW on Eastlink - S01 E01.mxf Format : MXF Commercial name : XDCAM HD 35 Format profile : OP-1a Format settings : Closed / Complete File size : 10.4 GiB Duration : 53mn 0s Overall bit rate mode : Variable Overall bit rate : 28.2 Mbps Encoded date : 2014-03-06 02:01:13.000 Writing application : SONY Vegas 12.0.0.726 Writing library : SONY Vegas 12.0.0.726 Video ID : 2 Format : MPEG Video Commercial name : XDCAM HD 35 Format version : Version 2 Format profile : Main@High Format settings, BVOP : Yes Format settings, Matrix : Custom Format settings, GOP : Variable Format_Settings_Wrapping : Frame Duration : 53mn 0s Bit rate mode : Variable Bit rate : 35.0 Mbps Width : 1 440 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate : 29.970 fps Standard : Component Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Interlaced Scan order : Top Field First Compression mode : Lossy Bits/(Pixel*Frame) : 0.751 Time code of first frame : 00:00:00:00 Time code source : Group of pictures header Stream size : 13.0 GiB Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709 Audio #1 ID : 3 Format : PCM Format settings, Endianness : Little Format_Settings_Wrapping : Frame (AES) Duration : 53mn 0s Bit rate mode : Constant Bit rate : 768 Kbps Channel(s) : 1 channel Sampling rate : 48.0 KHz Bit depth : 16 bits Stream size : 291 MiB (3%) Audio #2 ID : 4 Format : PCM Format settings, Endianness : Little Format_Settings_Wrapping : Frame (AES) Duration : 53mn 0s Bit rate mode : Constant Bit rate : 768 Kbps Channel(s) : 1 channel Sampling rate : 48.0 KHz Bit depth : 16 bits Stream size : 291 MiB (3%) Other #1 ID : 1 Type : Time code Format : MXF TC Time code of first frame : 00:00:00;00 Time code settings : Striped Other #2 Type : Time code Format : SMPTE TC Muxing mode : SDTI Time code of first frame : 00:00:00;00
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demux to get audio and then mix it to get stereo audio:
Code:ffmpeg -i video.mxf -map 0:1 -acodec copy -vn left_audio.wav -map 0:2 -acodec copy -vn right_audio.wav sox -M left_audio.wav right_audio.wav stereo.wav
Last edited by _Al_; 10th Mar 2014 at 20:23.
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You don't need sox anymore, ffmpeg can mix to stereo from dual mono using 'amerge'
eg
Code:ffmpeg -i video.mxf -map 0:1 -map 0:2 -c:a:0 pcm_s16le -c:a:1 pcm_s16le -filter_complex amerge out.wav
So if you wanted to demux with a batch file to elementary video and combine demuxed to stereo
Code:for %%a in ("*.mxf") do ffmpeg -i "%%a" -c:v copy -an -sn "%%~na.m2v" for %%a in ("*.mxf") do ffmpeg -i "%%a" -map 0:1 -map 0:2 -vn -sn -c:a:0 pcm_s16le -c:a:1 pcm_s16le -filter_complex amerge "%%~na.wav" pause
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I already have the soundtrack mixed as separate 16/48 stereo wav files peaking at -15db. Authoring software ought to let me pick those once I get the mpeg video demuxed. Worst case scenario, re-rendering the soundtrack to ac3 would not be a big chore at all. My wish is merely to avoid having to re-render the video, since it's been such an ordeal getting Vegas to chew it up and spit it out without vomiting.
Thanks for your command line wizardry, guys! -
... and if I understand correctly, the command line I'd use in this case for the video would be ...?
Code:ffmpeg -i in.mxf -c copy out.mpg
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You need an elementary video stream, not program stream (ie. no container)
Code:ffmpeg -i input.mxf -c:v copy -an -sn output.m2v
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