So what are some good hassle free programs out there that I can use to split and join .MP4 video files (with audio)?
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I was looking for the same thing, and will try Freemake Video Converter to join several MPG files (MPEG-1/2 mpgv 720x576 50fps + A52 AC3 a52 48KHz).
Am I correct in understanding that, due to variable bit rates, it's not safe to simply run "copy /b file1.mpg+file2.mpg output.mpg"?
honestly i tried freemake and does not work, no much quality as any wanna be freeware (that i am not sure it is).
Splitting a mp4 means that you have to cut at the GOP, but GOP accuracy is not so good.
I know only one software that can split a video (and eventually rejoin it) and that is second-wise precise and that is compatible with MP4 and, most of all, does not need to re-encode.
It's called SPAMALOT and so far is the best one i could find.
Last edited by Baldrick; 24th Nov 2012 at 13:15. Reason: Spammer
Hello All! I've tried a number of these programs; most of them simply don't work... and I'm a VERY experienced software engineer.
avidemux: extremely confusing, had a lot of difficulties synchronizing on a key frame. It would often get into loops of the form "can't advance to point <X>" from which the only escape was to use task manager to terminate the program. Once I got that part to work, it split off the section I wanted and saved it. Only problem was it consisted of 24 mins of black frame, which was not the original!
AIM's splitter-joiner: couldn't even open an MP4 file, simply said "cannot play <filename>". Failed after merely 10 secs of testing.
Freemake: failed a test but I don't remember which.
CUDA video converter: cannot load .VOB files correctly; it will often tell you that a file of 24 mins duration, say, (which plays fine in other programs) is of 2 mins duration, or sometimes zero and that's all the program will recognize.
I'm actually willing to pay for a good solution to general conversion, splitting, and joining, but it's nice to be able to evaluate them first. So far, I haven't seen one program that correctly does it all. Handbrake appears to encode to .mp4 correctly, but has no splitting or joining capabilities. All other programs I've tried for that latter functionality failed in some way within minutes of my trying them. Overall software quality in this field appears to this engineer to be shockingly low. Even modest testing in the lab should have revealed these problems.
Hello Baldrick, Thanks for reply. I'm willing to spend reasonable money - I don't demand free lol. I've been evaluating programs which give free eval copies. Yesterday, I tried Aimrsoft's program "Total Video Converter". It appeared to actually work correctly (it's about $60). Then, when I cancelled an operation, it froze my machine. Several reboots and tries later, with freezes occurring pretty much upon doing anything inside that program, my machine no longer makes it thru the Windows startup; even the startup recovery has failed; my computer is now effectively dead. It's possible this is a pure coincidence and there is a hardware problem. Some of these programs including this one use the NVidia GPUs to accelerate encoding and it is conceivable that this is related, as I did notice during the reboot and fix-attempt sequence one blue screen involving the video driver.
I have gotten a reply from AimOne (NOT same as Aimrsoft lol) about their splitter/joiner recommending I install the K-Lite Codec.
Once I get my pc running again, I will look at the program you recommend.
It sounds really good....
I have finally found a solution to this issue that worked for me. I have had similar problems to others with the audio sync problem, but I just tried this using the -f concat option with ffmpeg and it worked - with no audio sync issue.
I had to download the latest version of ffmpeg for this to work. Here is a link to the ffmpeg documentation describing how to join .MP4 files:
How to concatenate (join, merge) media files
Good luck, hope it works for you.
By the way, in my case, I was trying to concatenate 150 files from my Canon HF M50. Every time you hit the pause button, you get a new file, which is ok. But I want to merge all of the clips into one file when I'm all done. Since all of my files used the same codecs, I used the first example in the document above. Since it uses -c copy (-c is what codec to use, copy means just copy existing, don't transcode) it goes very fast, AND there is no loss in quality since it is not transcoded.
The hardest part is creating a text file with all of the files you want concatenated. It's not hard, just a pain.
Well, I hope this works for you all.
Avidemux works brilliantly with splitting and joining mkv / mp4 files, never have an issue, even 1080/50p files.
Freemake is the biggest piece of crap i think i have ever seen, looks like a kid created the user interface while playing in a candy store (horrid looking thing it is) and it might be free, but the makers actually get paid to incorporate 2 apps into its installer, forcing you to "untick" the boxes for those other apps during installation, and when you get it installed and open it, a big box appears asking you to install the "black bar removal" tool" which they then ask for a $9.99 donation to do it ????
My camcorder saves files as MPEG-PS with video MPEG2 and audio AC-3 6 channels. I'd like to join the multiple 2GB files it creates, and to shrink the file, convert video to H264 and audio to stereo.
Can ffmpeg do this?
VideoRedo 2 days ago, because of my frustration with some of the open source software i have been using, not for encoding/conversions, but for file splitting inaccuracy.
tsMuxer is a great tool to join m2ts files with, no issues, but splitting is not very frame accurate so i gave up.
XMedia Recode is great to convert, but file cutting, again not great.
handbrake is only for mp4 and mkv conversions.
Redo, in my opinion is the best of the file cutting tools, it appears to be more accurate than anything i have used, and it joins just about any type of files brilliantly, and outputs to just about any format as well.
for my testing over 2 days, i was able to confidently walk away and say that Redo does every single job i need any tool to do, where i needed a combination of at least 3 open source tools to do everything i needed confidently.
i love handbrake and XMedia Recode as conversyion tools, but for the best all in one, my $100 was very well spent on Redo, bought a license today, best thing i have bought for years.
solveigmm, i actually tried that several times, and it has the most rediculous user interface for file cutting i have seen, having to "add markers" every time you select a start/end point.
Redo just uses 2 markers, and you have buttons you click on depending on the action you require the markers to perform.