[FFmpeg-user] MP4 from MXP - Material Package Only

DeBacker, Bart Bart.Debacker at turner.com
Thu Feb 21 06:36:43 EET 2019


´╗┐On 2/20/19, 6:06 PM, "ffmpeg-user on behalf of Carl Eugen Hoyos" <ffmpeg-user-bounces at ffmpeg.org on behalf of ceffmpeg at gmail.com> wrote:

    2019-02-20 21:15 GMT+01:00, DeBacker, Bart <Bart.Debacker at turner.com>:
    >
    > On 2/19/19, 2:15 PM, "ffmpeg-user on behalf of Carl Eugen Hoyos"
    >>
    >> 2019-02-18 22:53 GMT+01:00, Marton Balint <cus at passwd.hu>:
    >> >
    >> > On Mon, 18 Feb 2019, DeBacker, Bart wrote:
    >>
    >> >> I grabbed the latest snapshot and see the same behavior.  I don't
    >> >> think this is really a bug, since the frames exist and are valid, but
    >> >> the MXF metadata is specifying a start time that is a few frames
    >> >> in and I would like the MP4 to match that.  Hoping there is a flag
    >> >> I am missing.
    >> > I am afraid there is no magic option in ffmpeg to fix this at the
    >> > moment.
    >>
    >> Do we have such a sample?
    
    > Let me know if there is a better place to put these, but for now
    > I shared via DropBox.
    >
    > Here is the hires file:
    > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.dropbox.com_s_1ayniyk2c2vst3q_hires.mxf&d=DwIGaQ&c=W8uiIUydLnv14aAum3Oieg&r=aerhCAdngbrokymnbwblqp9K3ANfkoN5gSBjxf80t0U&m=eHX85AHQvBN_-60zzWasfP4uYiuEEk2ruLbZAuOnDHg&s=5F7qByydkP66k-2HJIFwopLISL2pf_skMT4LQIzc3X4&e=
    
    Thank you!
    
    Do we also know which "tag" (if this is the correct mxf term) we ignore?
    
    Carl Eugen


I believe the 'Origin' key should be used.

"Origin: The number of Edit Units of a Track which exist before the Zero Point of a Timeline Track. A positive
value shall indicate that the Timeline Track starts before the Zero Point of the Package. A negative value shall
indicate that the Timeline Track starts after the Zero Point of the Package."

From:

https://ieeexplore.ieee.org/document/7292073

Bart 



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