appending is possible with streams using not the same settings (eg cabac + no cabac, gmc vs.no gmc aso) but thats not possible in mpeg-4 asp and avc (for avc its theoretically possible if you have 2 pps (eg 1 with cabac, the other without), and each stream refers to the corresponding pps, but i am not sure if existing players support this?) avidemux allows that a cutted stream starts anywhere (tough the frames before the first keyframe cant be decoded)
it seems cutting is only able if the final stream has at least two keyframes, altough theoretically only one at the start should be enough when i try to extract the raw video stream with mp4creator i get the "nal length past end of buffer - sample 1 size 91544645 frame offset 5 left 14741" error
AVIDEMUX SMART COPY MP4
when passing through avc in avi (x264) to mp4 it seems the output mp4 is not correct at all. packed bitstream doesnt get automatically unpacked when using mp4 output (when unpacking while opening the input avi it works fine) in both cases: muxing from a packed avi to mp4 (maybe an error message saying that passin through packed bitstream to mp4 isnt possible would be good?) and encoding to mp4 with xvid while enabling packed bitstream in xvid (that option should maybe simply be disabled when mp4 output is chosen?) when encoding with libav asp the vol aso isnt placed in the which is the place where to vol has to be stored in mp4 (only once as its not allowed to change) and very important. vosh, vol, gov aso is not removed from the keyframes when passing through asp avi files to mp4 (tested both divx and xvid) or when encoding to mp4 (xvid and libav tested) unorthodox 25025 timescale (seems to be correct) for 25fps content sets avgbitrate to 0 and maxbitrate to 9500kbps with asp passthrough doesnt seem to work on vfr streams (0kb mp4 created), tested both asp and avc (multiple entries in stts atom signal vfr) doesnt want to open 64bit mdat atom files crashes when trying to passthrough quicktime7 files (both asp and avc) i guess its because avi doesnt know/index b-frames and for mp4 (which signals b-frame timestamps in ctts) ctts isnt readout while opening?
it does not matter what created the mp4 (tested mp4box, mp4creator and 3ivx muxer) or the avi (tested xvid and divx - no error message tough when loading packed bitstream). this also leads to jerky playback in avidemux. it seems to be with b-frame asp streams (not avc). avidemux gives an "index is not up to date" error message on some mp4 and also avi files that should be correct. no such functionality there either.Code: - doesnt create ctts on streams with b-frames when muxing and encoding (with both asp and avc) To date.I cannot figure out a way to do it in Final Cut Pro. I own and use 2 of these programs just to get the simple jobs done.but I would much prefer to stay within Final Cut Pro.
AVIDEMUX SMART COPY WINDOWS
Another Windows program called Smart Renderer 6 can do it too. There is at least one under 100 dollar Windows video editor that can do this simple "smart encoding" after simple edits. Since 40 dollar stand alone programs can do this.one would think that functionality would be a not-too-hard feature to incorporate into Final Cut Pro.
AVIDEMUX SMART COPY PRO
It would be a great convienience to be able to stay within Final Cut Pro to accomplish simple edits and trims without the time consuming process of re-encoding entire video files. I cannot seem to find a way to do similar simple "smart" trimming or editing without Final Pro wanting to re-encode the entire file. My question here is directed to Final Cut Pro.
AVIDEMUX SMART COPY MAC
At present, the Windows version is much more stable than the Mac version. I now use with great results the program called Smartcutter by a company named Famering. QuickTime Player's trim option is good for a few straight cuts. (SmartCutter options have "Whole GOP mode" but I could not activate it). Unlike SmartCutter, Avidemux can show the GOP structure so the user can place the cut points at keyframes so no new frames are needed to re-encode (I could not spot any quality difference in newly generated frames, though). The results were very similar except Avidemux output lacked some GPS info (I used MP4v2 muxer because in my earlier tests it seemed better than the older MP4 mixer which caused the very first frame to open as a blank or black frame in MPEG Streamclip or Mojave's QuickTime Player).Īvidemux and SmartCutter are very similar with non-Apple GUI especially in SmartCutter.Īvidemux has much more options which might be overwhelming and need some tests before choosing the best workflow (the default is a straight lossless copy as MP4). I used mainly the default settings in this quick test. mp4 with QuickTime Player, Avidemux and SmartCutter and compared the output specs with Invisor. I briefly tested in Big Sur to trim a DJI P3P silent 4K D-log.
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