[FFmpeg-trac] #5213(undetermined:new): Change Flags for MPEG files without reencode

FFmpeg trac at avcodec.org
Tue Feb 2 19:39:08 CET 2016

#5213: Change Flags for MPEG files without reencode
             Reporter:  mboufleur    |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by mboufleur):

 I believe this would be particularly useful for MPEG-1 and MPEG-2 videos,
 regardless if they are within MPEG-PS, Transport Stream, RAW Mpeg Video,
 Quicktime MOV, MXF, etc.

 The changes would happen at the video headers, and there would be some
 input info from the user side to specify which parameter to change, and
 also the value (aspect ratio, frame rate, bitrate, timestamp, etc). I
 believe these sort of changes could be done with a hex editor, but I lack
 the inner depths of MPEG encode to confirm that.

 There are some applications that do exactly that (DVD Patcher, Restream,
 Womble MPEG Video Wizard, TMPGEnc MPEG Editor, TMPGEnc Smart Renderer,
 etc), but almost all of them are Windows oriented, and depending on the
 application you may get specific features and/or limitations.

 There are also other tools mainly targeted at DVD packages, that perform
 changes at the IFO level, but that is not what this request is for.

Ticket URL: <https://trac.ffmpeg.org/ticket/5213#comment:2>
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