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Unable to transcode above 20Mbps?

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brad hebert
Unable to transcode above 20Mbps?
on Apr 14, 2017 at 4:12:44 pm
Last Edited By brad hebert on Apr 14, 2017 at 9:33:15 pm

I have a .mov MPEG-4 at 393Mbps. I want to transcode it to a .mp4 h.264 at 30Mbps, but the highest I can get is around 20Mbps. I have tried VBR and CBR, and I've even cranked the bit rate slider up over 100Mbps. Can someone explain this?

Edit: Actually, if I set the target to 100Mbps, it does end up around 31Mbps. But I'd still like to know what's going on.


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Jeff Pulera
Re: Unable to transcode above 20Mbps?
on Apr 17, 2017 at 5:32:43 pm

Most likely scenario is that since you are recompressing from a lower to higher bitrate, the source video being already compressed, the encoder is only using as much data as needed to re-encode the material. Encoding to a higher data rate would yield no possible increase in quality, thus the resulting low bit rate.

What you are trying to do is similar having a text document and trying to make a new version of it that is larger, but that would be impossible without adding more words, if that makes sense.

Thanks

Jeff Pulera
Safe Harbor Computers


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brad hebert
Re: Unable to transcode above 20Mbps?
on Apr 17, 2017 at 5:34:30 pm

The source is actually a large Animation codec, around 250Mbps.


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Jeff Pulera
Re: Unable to transcode above 20Mbps?
on Apr 17, 2017 at 5:43:36 pm

Oops, misread the original, thus my response. Got new trifocals last week, but sent them back due to a problem with the frames. Helps to see what I'm reading...

So what kind of video content? Maybe the content doesn't warrant a high bit rate as the encoder sees it? It's going to try to be efficient in compressing the content.

Thanks

Jeff


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brad hebert
Re: Unable to transcode above 20Mbps?
on Apr 17, 2017 at 5:48:12 pm

Yeah, my guess is that the software is not using more data than needed for the simple image content. But I know it is possible to force higher bitrates. For example, FFmpeg seems to do that. But I need a solution with a decent GUI.


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