Jerky panning after rendering.

Forum|Forum|7 years ago
July 26, 2018
4 replies
4981 views

I am using APE15. I have a fairly good cam, a Panasonic AG-AC30. I record in MP4 1920 x 1080 at 50 fps. Bitrate is 49790kbps. Playing the MP4 on my PC seems to be fine. There is a very slight stuttering on panning but this I believe to be normal, the faster the pan, the worse stutter, but perfectly watchable.

After I have completed editing I render and save to MP4 H264 1920 x 1080 25fps bitrate 15Mbps. Playing the resulting video either on monitor or TV, there is a very uncomfortable chopping on horizontal and vertical pans and zooms. The faster the pan or zoom, the worse it gets. Unlike the original MP4, the stutter is unacceptable. It is as if several frames are being dropped every second.

Am I doing something wrong? I have never noticed this on previous cams but I'm sure it is not the cam because the original files play OK. I wondered if it was something to do with the 50fps recording versus the 25fps render but not sure. Is it the recording settings at fault, or the APE settings? The recording cannot be repeated so I hope there is something that can be done between capture and render.

This topic has been closed for replies.

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Steve Grisetti

Legend

Yes, I'm definitely seeing it in your video, syd. I just don't know what to recommend.

However, you may want to post at the free Community Forum at my web site Muvipix.com. There's a worldwide community of very knowledgeable photographers and videomakers there, and I'm sure they will have some good ideas.

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Steve Grisetti

Legend

For the Quicktime codec, select H.264.

Although this will produce an MOV file, it will actually be an MP4. Or Quicktime's version.

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sydhsydhAuthor

Inspiring

Hi Steve. When Quicktime is selected, I do not have an H264 option, only those I tried and DV options and uncompressed options.

I have found that staying in H264 and then Match Source will change the output to 50fps. I am running this as we speak but it will take around 3 hours. (It is 2hr 25 min video). I will let you know the outcome. Thanks for your assistance. (I'll be back).

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Steve Grisetti

Legend

You are correct. I'm sorry. This option is not available under Quicktime settings in version 15.

I'm not sure what to recommend instead.

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Steve Grisetti

Legend

Everything is set up as it should be.

You are, as you know, down-stepping from 50 fps to 25 fps, so action and movement won't be as smooth in your output as it is in your original video. But that's the nature of down-stepping.

You can create a custom 50 fps output and see if it makes a difference.

Under Export & Share/Devices go to the Custom tab and click Advanced Settings. In the Export Settings panel that opens, select Quicktime as the Format and, on the Video tab, click the Match Source button. This should create a preset that is 1920x1080 with a Frame Rate of 50 and a Progressive field order. Click OK and name the preset for future use.

I also recommend you play back your videos on the excellent VLC Media Player rather than the meh Windows Media Player. It will give you much smoother playback.

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Bill Sprague

Community Expert

I have a Panasonic camcorder that shoots 1080p60. With stabilization on, it tries hard to make my camera movements steady. And that includes pans. In other words, with me panning and the stabilization on the clip will be jerky every time. There is a setting to reduce the horizontal stabilization to improve panning. It works best having it off if I have to pan a shot.

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sydhsydhAuthor

Inspiring

I understand your suggestion but if this was the case, the original MP4 would be jerky which it is not. Well just a little bit but not a problem for viewing. The problem develops after the file has gone through APE. I am about to try Steve's suggestion above. I did wonder if there was a problem going from 50fps to 25fps. I will see what the output in Quicktime is like. In the future I may try setting the cam to 1080p25 but it seems a shame. It's a pity there is no MP4 50fps output.