Rendering problem with Kdenlive

I really enjoy using the Kdenlive video editor. I think it’s a simple, straight forward, and yet powerful tool.

But just during the last few days, I had troubles for the first time and could not find a solution. When rendering my project, it kept failing with max_analyze_duration 5000000 reached at 5000000. I searched online, the error might be related to the size of the audio (>1h) Still, the project rendered at first, but after the final cut – with lots and lots of cuts – I started getting this error, thus, out of a sudden, I was not able to get my final video file out anymore. Was I threatened to having to do the entire work again or what??

Finally, today I found a solution! Better, a workaround.

I split up the file by adding guides – in my case three, but the number might depend on the project size – and then used the render feature “Guide zone” (at the bottom of the render dialog). So, I rendered three parts and used melt to put them together like this:

melt input*.mp4 -consumer avformat:result.mp4 acodec=aac ab=160k vcodec=libx264 vb=3000k

I’m using x.264 and AAC here – but you can also drop all those parameters and let melt figure everything out – it’s pretty capable, give it a try.

melt input*.mp4 -consumer avformat:result.mp4

If you have ffmpeg on your system, you can merge the files using the copy mode, so no quality gets lost – see details here. But even when using melt and thus re-encoding the video, you will not notice that it has been rendered in three parts and “melted” later. So I’m happy! Still a bit surprising that I could not find a solution online. So hey, hope this approach works for you too! 🙂

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