Search everywhere only in this topic. Advanced Search. Classic List Threaded. Aspect ratio. Now one of the channels changes between and at irregular intervals so is there a way to get the encoding to follow the aspect ration correctly? Leo Izen. Re: Aspect ratio. Henk D. AFAIK there is no solution to this in ffmpeg. The only solution I know of is a hardware solution. In reply to this post by Leo Izen. In reply to this post by Henk D. Got to say that the quality is very good for the rate!!!
That's why I was wondering about the mentioned 12 streams live encoding. Jason Garrett-Glaser Stefano Sabatini. Janos Barta. Hi, On Corne Beerse.Scaling Video preserving aspect ratio with ffmpeg
Have i missed something about the new ffmpeg. Dave Pope. Re: ffmpeg and x Yeah, I hit this one too. Use "-preset" and "-profile" switches instead of -vpre.
Annoying that it's not reflected in the --help output; I don't see a way to list the available values yet either.
Thanks for the quick update, im looking at posting a new patch to allow UDP to use a task for receiving data and wanted to check it with a new git pull first.
Now i can test it and post the patch. Will delve into the ffmpeg code and see if there is some way of getting around this, maybe even stopping ffmpeg when the aspect changes and restarting in the new aspect ratio.Mole ratios chem worksheet 12 2
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For example, I want specify for the output video only width px and ffmpeg must automatically calculate height with right aspect ratio. For instance, if you stretch the video out twice as wide, it will make the aspect ratioor something similar ? Learn more. FFmpeg - Change resolution of the video with aspect ratio Ask Question. Asked 5 years, 10 months ago. Active 9 months ago. Viewed 53k times.Hostelbookers app
How to change resolution of the video with aspect ratio with FFmpeg? The following abbreviations are recognized: and -aspect aspect Set the video display aspect ratio specified by aspect. For example "", "", "1. If I will run ffmpeg with -s x, then second video will have bad aspect ratio. How can I limit output video by width, with auto aspect ratio by height? Arthur Arthur 2, 4 4 gold badges 23 23 silver badges 58 58 bronze badges.
It only takes a minute to sign up. I want to use ideally either ffmpeg or mencoder or something else, but those two I know I have working to convert any incoming video to a fixed screen size. If the video is wider or too short for it, then centre crop the video. If it's then not the right size, the resize up or down to make it exactly the fixed screen size. I've found lots of pages showing how to resize to a maximum resolution, but I need the video to be exactly that resolution with extra parts cropped off, no black bars.
If it needs to be multiple command lines run X to get the resolution, do this calculation and then run Y with the output of that calculation I can script that. You can set the width or height to -1 in order to let ffmpeg resize the video keeping the aspect ratio. Actually, -2 is a better choice since the computed value should even. So you could type:. Once you get the video, it may be bigger than the expected x since you let ffmpeg compute the height, so you'll have to crop it.
This can be done like this:. Finally, you could write a script like this can easily be optimized, but I kept it simple for legibility :. The above first crops a video to portrait, then scales to px high x the appropriate even number width.
I'm new to ffmpeg but now have a nice little converter going in VB. NET that creates raw movies of various output formats for use in small devices that have SD card access but not enough power to decode complex video. Because of the way it works when resizing and cropping I had to code it manually and build the parameters.Chicago electric chainsaw sharpener
Basically I need to know the resultant width and height. Only 4 variables are needed as input 1 Original video width, 2 Original video height, 3 Device width, 4 Device height. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Convert a video to a fixed screen size by cropping and resizing Ask Question. Asked 5 years, 1 month ago. Active 3 years, 1 month ago. Viewed 42k times.Search everywhere only in this topic.
Advanced Search. Classic List Threaded. Changing aspect ratio flag without re-encoding.
Changing aspect ratio flag without re-encoding
Am I doing it wrong, or is it not possible without re-encoding? Re: Changing aspect ratio flag without re-encoding. Kevin Oberman. In reply to this post by mi. If someone is aware of a Linux tool that can do it, that would be nice. In reply to this post by Kevin Oberman. They are Henk D. This post has NOT been accepted by the mailing list yet.
Aspect ratio is not anywhere near as simple as it looks. If you want to learn a lot about it, read the wikipedia article on Aspect ratio and, more important, pixel aspect ratio. If you have a file that should be wide-screenbut displays at with "skinny" people, try adjusting the PAR, but, without re-coding and losing quality, ffmpeg won't do this. Please note that pixels in standard video are NOT The proper PAR for isas indicated in the output above.
Video Production Stack Exchange is a question and answer site for engineers, producers, editors, and enthusiasts spanning the fields of video, and media creation. It only takes a minute to sign up. I'm using the following command in my android application to overlay an image on top of a video:. I implemented the above after asking this question.
This works perfectly fine when the video aspect ratio isbut I have users that complain that the image is not at the correct position. I noticed that this is on devices that has a different aspect ratio, for example Is it correct if I change the command to the following, if for example, the aspect ratio is ?
I tested with the command above using a video with the following dimensions - x - aspect ratio ofthen the video dimensions change to x - aspect ratio of If I use the video mentioned above x - aspect ratio of and I try to change the aspect ratio tousing the first command in this question, then I get the following error:. Here is the log without using -noautorotate. Here is the log with using -noautorotate. First, the scale and setsar make sure the image becomes a square-pixel input.
Then the pad checks each dimension and pads to a frame size. Sign up to join this community.Fase 2: kompatscher, lepidemia non è superata
The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. FFmpeg issue with aspect ratio Ask Question. Asked 9 months ago. Active 10 days ago.VideoHelp Forum. Remember Me? Download free trial!Hacked bank account details
Results 1 to 9 of 9. Hi all, I 've tried some command line given in some thread about changing aspect ration of MP4 using ffmpeg. Too bad that all of them is through re encoding process.
Do anyone know what line used to change aspect ration of MP4 video without re encode using ffmpeg? Thanks in advanced. Not all players will obey aspect ratio flags.
You might want to consider mp4boxsince its more reliable for changing AR than ffmpeg. Originally Posted by smrpix.
Originally Posted by poisondeathray. Last edited by morsh; 15th Jul at Originally Posted by morsh. May I know how come ffmpeg is less reliable in AR changing? There's a muxing-only build of ffmpeg here that'll modify info such as aspect ratio in the video bitstream. I read through a bit of the thread a linked to and it appears the ffmpeg build can still accept "-aspect x:y" or "-aspect X" in the commandline to change the container aspect ratio along with a SAR to change the bitstram aspect ratio.
If so, it's a pity both aspect ratios can't be expressed the same way, but it appears it probably can change both the container and bitstream aspect ratios at the same time. When both aspect ratios are the same, at least there won't be conflicts. I have been using ffmpeg to change change the aspect ratio of video files actually. A file gets copied with the new file extension and no errors are reported but the file won't open in MP4Explorer which I use to examine the track header box values and plays with the wrong aspect ratio in e.
How could it work for small files but not for larger ones? Contact Us VideoHelp Top. All times are GMT The time now is All rights reserved.
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Looking at the video facts, Is the error that a the actual video has been incorrectly stretched in the pixel data, or b there is simply some metadata value that has been incorrectly set? If the former, I know I can re-encode the video and change the width and height. But if the latter, what ffmpeg command to I run to fix the metadata without re-encoding the video itself?
If you want to change the video to display atyou will either need to change the actual pixels in the image by scaling the pixels and changing SARor by setting a metadata flag that at the container level that tells external media players to stretch the image to your desired DAR.
You will not be able to scale the pixels and change SAR without applying a video filter. If you choose this method, you will be required to transcode the file - since you cannot "stream copy" the video stream while applying a video filter. On the other hand, if you just want to change the metadata flag and adjust the DAR, you will be able to stream copy the video. To do this, try:. Delgado's answer is correct that MP4Box can do this, but the -par option doesn't work quite as described. With an -out parameter so as not to disturb your original file :.
Equivalently, you're describing the aspect ratio of a source pixel.
For this case, you need:. It could beI suppose very close tobut I don't know of anything that produces that pixel aspect ratio; maybe try that first, and then try if it still looks a little too stretched horizontally. If you're certain it's exactlyof course, just use Changing the SAR without reencoding also works with ffmpeg on.
Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Correct aspect ratio without re-encoding video file Ask Question. Asked 4 years, 11 months ago. Active 1 month ago. Viewed 50k times. Active Oldest Votes. JakeGould 39k 11 11 gold badges silver badges bronze badges. Changing the aspect worked straight away! You can't use -c copy and scale at the same time; however you can use -aspect to change the aspect ratio at the container level but not the stream level.
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