6 Replies Latest reply: May 31, 2012 6:38 PM by Howard Hoffman RSS

    Cut and join m4v files

    Howard Hoffman Community Member

      Hi,

       

      I am not sure if this is the wrong forum.  I have 2 m4v sources file.  A is 2 hours long.  B is 1 min long.

       

      The project has already been created with A and it has a lot chapter markers.  The problem is that A has a section that needs to be replaced by B at the early part.  If I shorten A on timeline, append B and then add A again, I've have to redo all the chapter markers and poster frame.

       

      Is there a tool that do this external, creating another m4v file to replace A without re-encoding?  this way I can just replace A and open Encore again.

       

      Thanks

        • 1. Re: Cut and join m4v files
          JSS1138 CommunityMVP

          You'll not only have to reencode, you'll have to redo all your chapter markers.

           

          Sorry.

           

          (Do NOT replace the current A clip with a new A clip outside of Encore.  If you need to replace A, call it something else, like A1, and do a proper Replace from inside of Encore.)

          • 2. Re: Cut and join m4v files
            Howard Hoffman Community Member

            I did the following:

             

            Shorten A on timeline to the point when B will be inserted

            Append B

            Append A again, this time removing from the start to the point where B is ending

             

            Everything works nicely, EXCEPT:

             

            Encore will write out A twice.  So now it's oversized and won't fit on the disc.

             

            Still searching for tool to split and join m4v files.

            • 3. Re: Cut and join m4v files
              Jeff Bellune CommunityMVP

              Howard Hoffman wrote:

               

              Still searching for tool to split and join m4v files.

              It's called Adobe Premiere Pro.

               

              Jeff

              • 4. Re: Cut and join m4v files
                Howard Hoffman Community Member

                Yeah, that's the last resort.  I'd want to avoid re-encoding if possible.

                • 5. Re: Cut and join m4v files
                  Jeff Bellune CommunityMVP

                  Howard Hoffman wrote:

                   

                  Yeah, that's the last resort.  I'd want to avoid re-encoding if possible.

                  None of the Adobe apps* do smart rendering, which is what you are attempting to do.  Like Jim said, you will have to re-encode no matter what.  It's better to go back to the source file for re-encoding.

                   

                   

                   

                  *The 6.0.1 update to Premiere Pro does do smart rendering for a single, very specific file format.  It's for long GOP MPEG2 OP1a exports, where the original material is a matching long GOP MPEG2 OP1a or XDCAM EX file.  MP4 is not part of this smart rendering feature.

                  • 6. Re: Cut and join m4v files
                    Howard Hoffman Community Member

                    Thanks for the advice.

                     

                    My trouble is that I no longer have source.  The encoded m4v is not of high bit rate so re-encoding will be quite bad.

                     

                    Using VideoRedo, I did the following:

                     

                    - mux m4v and ac3 into .ts (it can't open m4v and it does not like m2ts created by itself)

                    - join A1 - B - A2

                    - save result in ts

                     

                    So far, everything looks good as the result can be played in all kinds of player.

                     

                    Then the frustration begins

                     

                    Encore does not like ts (import superfast but says untranscoded)

                     

                    Use VideoRedo and save m2ts; Encore loads from 0-100%, but remains untranscoded

                     

                    Use VideoRedo or tsMuxerGUI to demux, Encore imports the result .h264 file but complains the encoder is not available

                     

                    Now I am stuck again and have to look for a different tool.