hi all,
i have 399 consecutive jpeg files. i want to make a video from them. i use the follwing command:
ffmpeg -f image2 -i image%d.jpg video.mp4
there is no problem in the progress. total length is 15-16 seconds. however video is too fast compared to real life. i tried to reduce fps to get a longer video using the following command (1 fps, just to test):
ffmpeg -f image2 -i image%d.jpg -r 1 video.mp4
nevertheless it just uses first 18-19 images to create a 18 seconds long video... it shows 1 image for 1 second but its length is not 399 seconds as expected in this try. since i don't know much about the mechanism of such things, i think i am missing something. so what is that? show me the light![]()
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Hi
This is from the ffmpeg documentation.
Here:- http://www.ffmpeg.org/ffmpeg-doc.html
Maybe you need to modify your command.
For creating a video from many images:
Code:ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
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yeah i did that %03 thing, it uses all images for 16 sec video. i am looking at the documentation. there is a problem with -r option. for "-r 10", resulting fps is 16 at the end and it uses half of the images
... i want 10 fps for these 399 images to get a ~40 sec video. "-r 10" doesn't do this. thank you however
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omg! thank you gavino!
btw, to get same quality (each image is 85KB), which one is the best: adding "-b 850k" or higher to the command (video is 10 fps) or "-sameq"? -
I think if you use "-vcodec copy", you will get an MJPEG video without any re-encoding of the image data.
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ffmpeg -i ma.mp4 -vcodec copy -s 640x360 ma2c.mp4
ffmpeg -i ma.mp4 -s 640x360 -vcodec copy ma2b.mp4
i tried commands above, they give exactly the same video. yes i can see them jwplayer but they are not resized. i want to cut heigth and width to half to get a nearly 1/4 file size. my jwplayer window is also 640x360, so big movies are seen as rasterized while not in fullscreen mode... thank you for your reply, expecting more of them -
When you use -vcodec copy, the -s option is ignored.
Resizing the image requires recoding. -
sorry Gavino, i have another topic, i mix them :/ ... it is:
https://forum.videohelp.com/threads/331247-ffmpeg-jwplayer-mp4-problem
anyway do you have a suggestion? as you can see below, the recoded file is not H264, so how can i do that? i think the problem arises from this difference... When i execute "ffmpeg -i ma.mp4 -s 640x360 -sameq ma2.mp4":
the properties of original file(ma.mp4):
Video: MPEG4 Video (H264) 1280x720 25.00fps [Video]
Audio: AAC 44100Hz stereo 1411Kbps [Audio]
the properties of recoded file(ma2.mp4):
Video: MPEG4 Video 640x360 25.00fps [Video]
Audio: AAC 44100Hz stereo 1411Kbps [Audio] -
i tried your command and alike but i got the following in red color:
[libx264 @ 01db8d40] broken ffmpeg default settings detected
[libx264 @ 01db8d40] use an encoding preset (e.g. -vpre medium)
[libx264 @ 01db8d40] preset usage: -vpre <speed> -vpre <profile>
[libx264 @ 01db8d40] speed presets are listed in x264 --help
[libx264 @ 01db8d40] profile is optional; x264 defaults to high -
i tried following:
ffmpeg -i ma.mp4 -s 640x360 -vcodec libx264 -vpre baseline ma2.mp4
ffmpeg -i ma.mp4 -s 640x360 -vcodec libx264 -vpre hq ma2.mp4
for the first one it gives this error at the end:
File for preset 'baseline' not found
i try -fpre and i give full path to preset file, but it gives same error. btw my original video is:
http://vimeo.com/14839484
it is a nice video to check video quality after re-encoding.
maybe i should convert all files to flv but as far as i can see, the performance of flv is lower than of mp4. what do you recommend? or is there a solution to this problem? -
I would expect that to work. Did you give the entire path name+extension, eg
-fpre "C:\folder\libx264-hq.ffpreset" ?
If the folder name includes spaces, you will need quotes round the parameter.
maybe i should convert all files to flv but as far as i can see, the performance of flv is lower than of mp4.
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