You didn't mention audio, so I assumed there was none. If your ffmpeg does not support this, and you want to use it, then see FFmpeg hardware acceleration on Raspberry PI. This example uses the encoder h264_omx which utilizes OpenMAX IL hardware to encode. Trim=128:166,setpts=PTS-STARTPTS \Ĭoncat=n=6:v=1:a=0"įiltering will require re-encoding.
If you want to perform filtering, such as scaling to conform some segments so they are all the same, then use the trim, setpts, and concat filters: ffmpeg -i input0 -i input1 -i input2 -i input3 -i input4 -i input5 \ If frame accuracy is required see the method below. For example to compute the CRC of the input audio converted to PCM unsigned 8-bit and the input video converted to MPEG-2 video, use the command: ffmpeg -i INPUT -c:a pcmu8 -c:v mpeg2video -f crc. See the inpoint and output documentation for details. You can select the output format of each frame with ffmpeg by specifying the audio and video codec and format. The in and out points may not be accurate unless your inputs are intra-frame codecs (if you are unsure they probably are not). If they differ see the next method below. Note that all segments must be the same format, width x height, frame rate, etc. Then run ffmpeg: ffmpeg -f concat -i input.txt -c copy output.mp4 Creating Modern WPF Applications with MahApps.You can use the concat demuxer to do this without needing to re-encode.įirst make a text file: file '/path/to/video_01.mp4'.Understanding Distributed Version Control Systems.Understanding and Eliminating Technical Debt.Building Serverless Applications in Azure.Azure Container Instances: Getting Started.Microsoft Azure Developer: Implement Azure Functions (AZ-204).Versioning and Evolving Microservices in ASP.NET Core.Microservices Architecture: Executive Briefing.Microsoft Azure Developer: Deploying and Managing Containers.Hope someone finds this helpful, and if there is an even better way to achieve the same results (which I’m sure there is), do let me know in the comments. Now we are finally ready to concatenate our files, and we can do that with the following syntax: ffmpeg -f concat -i inputs.txt -c copy output.mp4Īnd that’s all there is to it.
Let’s create inputs.txt with the following content: file 'part1.mp4' To use the concat demuxer we first need to create a simple text file containing the details of each file we want to concatenate.
FFMPEG CONCAT DEMUXER DURATION MP4
There are a few different concatenation options in FFmpeg, and in our case it is the “concat demuxer” we need, as the “concat protocol” won’t work with mp4 files. So now we have our three parts, we need to join them together.
If you’re a C# programmer like me, you’ll just fire up LINQPad and enter a quick expression to calculate the difference between the start and end times: TimeSpan.Parse("1:02:20") - TimeSpan.Parse("0:10:50")Īnd of course the final parameter is the output file. The slightly tricky one is the -t parameter, which is not the end time of the section you want to cut, but the duration. The -i switch introduces the input file name, the -ss switch indicates the start time of the section we want to cut. Now most of that is probably self-explanatory. And then we stitch them all back together again. First we create three shorter mp4 files containing just the portions we want to keep. In this example, the file we want to edit is called input.mp4. For convenience you’ll probably want to make sure ffmpeg.exe is on your PATH.
FFMPEG CONCAT DEMUXER DURATION 32 BIT
I used the static 32 bit Windows version from here. It took me a few goes to find out how this can be done, but eventually I got something working.įirst of all, make sure you have downloaded a build of FFmpeg. I recently needed to cut a few sections out of a pre-existing MP4 file to make it a bit shorter. You can use it to perform all kinds of amazing manipulations on video (and audio) files, if only you can work out the correct command line arguments.
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