-
Unable to transcode above 20Mbps?
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.
-
4 Replies
-
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 -
The source is actually a large Animation codec, around 250Mbps.
-
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
-
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.
Reply to this Discussion! Login or Sign Up