I would like to create a quicktime movie from a sequence of still frames via perl. It seems like there should be a relatively simple way to do this, but so far I have not found it. Things I've tried:
Reading the Quicktime file spec and creating the movie file from scratch. This low level approach has worked well for me in the past with TIFF and PDF file formats, but Quicktime seems dauntingly complicated.
Looking at the various quicktime-related perl modules. So far I haven't found one that lets me do what I want (images --> movie) with a minimum of fuss.
Using Applescript and Quicktime Player. This would probably work if I paid for Quicktime Pro, but I'd prefer not to do that.
I'm interested in any suggestions (even non-perl-based ones) for a relatively simple way to assemble a sequence of images into a quicktime movie.
Video encoding isn't really an ideal job for perl -- there are a lot of pieces to put together. I would suggest just using mencoder -- you can use an input of e.g. -mf type=png:fps=30 mf://frame*.png, and an output format of e.g. -of lavf -ovc lavc -lavcopts vcodec=libx264 -o whatever.mov. If you want to dub in audio you can use -audiofile whatever.mp3, and then either -acodec copy if you want it to be MP3 in the movie as well, or perhaps -acodec faac (and -faacopts) if the audio format in the movie needs to be AAC. There are lots of different options to tweak and things to learn but it's pretty much the ideal tool for the job. FFmpeg is nicer to use in a lot of ways, but it doesn't have the mf:// input mode, which makes assembling a video from frames a lot more painful.
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i want to ask if there is any option to just merge multiple fragments downloaded from HBO GO app and mux it to some normal format like mkv or mp4??? Because these fragments has no file type. Some script, program, guide ??? It looks like this
for video: Fragments(video=0), Fragments(video=10000000), Fragments(video=20000000), Fragments(video=30000000), Fragments(video=40000000), Fragments(video=50000000)
...for audio Fragments(audio_eng_st_dub=0), Fragments(audio_eng_st_dub=20201361), Fragments(audio_eng_st_dub=40402721), Fragments(audio_eng_st_dub=60604082)
...for text is simillar.
youtube-dl doesnt support HBO GO direct download so if anybody can help me with it ???
Thank you
They are probably fragmented mp4, You can just concat them with the init fragment and many players can play it.
However HBO use DRM, so you will never be able to play these files.
I am doing a project in which I have a video I divide the video into frames and then the image steganography is applied to the frames and the encoded frames are generated. Then the encoded frames are to be converted into video again. All of the methods are applied successfully but the only problem is that I get the encoded video which is very large then the original video. I am using the movie2avi function to generate the video.
Can someone suggest any way to generate the video which is not very large compared to the original video?
First, if you're using movie2avi, you have a limited choice of very poor codecs (compression formats). If you have a new enough version of Matlab (R2009b+ I think) you should be using the VideoWriter class instead. The choice of codecs is still not very good, but they are of much better quality. You didn't indicate which codec (or OS) you're using so I can't recommend an alternative.
Second, even under ideal circumstances you should expect your movie file to get larger with what you're doing unless you apply additional compression. Adding steganographic content is akin to adding noise so you're making the data harder to compress. In both movie2avi and VideoWriter you can adjust the compression level or quality depending on the codec. Also, the default movie2avi codec under Linux and OS X uses no compression so the file will be huge if you haven't changed that.
If VideoWriter doesn't meet your needs (or if your version doesn't have it) you can try my QTWriter class on GitHub that allows one to export QuickTime movies in Matlab. It works very much like VideoWriter, but allows you to create high quality QuickTime movies using a few image-based codecs. No inter-frame compression is used and the PNG and TIFF formats are lossless (this may be important to your steganographic application) while being very efficient at encoding content like that often generated in Matlab. There is also a JPEG format that may be better suited to general images. The QuickTime files can then be converted to other formats if needed. You can read more and see examples here and download the single M-file here.
This is completely dependent on what you are trying to hide in the original video. Remember that the original video is using a compression codec that can take advantage of minimal change frame to frame and various other things, but if you go and try to hide something in that video through steganography, you are making it more difficult for the compression algorithm to do that, which will definitely result in a larger file. So you have to be careful what you are attempting to do, and how you are attempting to encode it.
I am working on a project where I have to split a movie file into its basic audio and video parts first. After googling and through documentation and psychdemos in psychtoolbox, I am unable to find even a clue to this issue.
Is there any function in psychtoolbox to split a movie clip like .mpeg or .mov or .avi or .flv into its audio and video parts ?
Please help.
Thanks a lot for your consideration.
First off, it is key to realize that pyschtoolbox is well simply a toolbox. There is a host of other built in MATLAB functions that you can use along with pyschtoolbox.
It looks like even in MATLAB, doing this is a pain in the a$$, but I did find this untested by me FEX entry. http://www.mathworks.com/matlabcentral/fileexchange/8028-mmread
It looks like it should be able to do what you want and it does not depend on purchasing other toolboxes, etc.
By the way, is this a project from elance.com?
I am having trouble doing what the title said. My goal is to be able to add any desired effects to your recording, save the modified audio, then send that to a server.
I have searched the fourms and came across these threads:
viewtopic.php?f=7&t=13029&p=45362&hilit=saving#p45362
viewtopic.php?f=7&t=12660&p=44586&hilit=saving#p44586
viewtopic.php?f=7&t=13178&p=45746&hilit=saving#p45746
After reading those, I see it is possible to save the modified audio, but can it only be saved as a wav? Like I said after it is saved it will be sent to a server, so size is a big deal and wavs are relatively big compared to other formats. Ignoring that fact, I tried to implement FMOD_OUTPUTTYPE_WAVWRITER and I cannot get that to work; are there any good examples of using it? I looked though the examples in the library but I didn't see any..
But the basic structure of the app is to record, turn some switches off and on to see what filters you want, preview it, then press a button "Save" that will save it. What would this save function consist of?
Any help appreciated, thanks.
Using FMOD_OUTPUTTYPE_WAVWRITER is fairly straight forward, you set the type via System::setOutput, specify the output file via System::init extradriverdata. The extradriverdata should be an absolute path to a writable area of the device such as the documents directory. After you have finished playing, call System::release and the file will be complete.
The other option for recording wave data with effects is by creating a custom DSP and connecting it to the channel playing the recorded data. You will then get regular callbacks giving you float data that you must write out to disk yourself. You can find examples of DSPs and writing wav files in the dsp_custom and recordtodisk examples respectively.
Finally note that FMOD doesn't come with the facility to write compressed audio to disk, you will need another API to achieve this goal.
You can save as an AAC file via the ExtAudioFile API.
Alright, what I need is a command-line application that allows you to take a screenshot of a file's audio stream.
For example it should be run like this:
app.exe "C:/artist-title.mp3" "C:/mp3Stream.jpg"
app.exe "C:/artist-title.wav" "C:/wavStream.jpg"
It only has to be able to capture mp3 streams, other streams are a bonus.
Preferably all audio channels are listed in the image, but if all channels are combined into one mono stream it would work just as good for me.
So, is there such a application out there? So that I don't re-invent the wheel.
If not does anyone have tips on how I should go about writing such a application myself? Preferably in Java. I can handle programming pretty well but I'm not exactly an expert on the MP3/WAV formats.
Why do I need it...? Well, it's more fun to link to a file online with some sort of preview image besides the link. It gives you a hint of the audio character before you listen to it (is it loud? does it look like "bit music"? does it have any parts that are more quiet than others? etc).
Never mind, I wrote my own little application in Java.
It was a piece of cake once I found this excellent guide:
http://codeidol.com/java/swing/Audio/Build-an-Audio-Waveform-Display/
Although you can't download the source from that page (as far as I can tell, though he makes it apparent that you should be able to) he does provide some very useful key lines of code that makes it easy to puzzle together the application.
Adding a little bit of help (easy stuff). You can get a graphics object from doing so:
BufferedImage img = new BufferedImage(500, 100, BufferedImage.TYPE_INT_RGB);
Graphics2D gfx = (Graphics2D) img.getGraphics();
And once you have drawn everything you need on the gfx you can save it to disk just by one line:
ImageIO.write(img, "jpg", new File("waveform.png"));
It's hard to get it to look very good though. Doesn't look as nice as for example Audacity. Guess they have spent more time on it than a few hours though.
The biggest pain about this is however that Java don't support MP3 import. They really should get around to that.
So to get the waveform of MP3s I first convert them into WAV using "javazoom.jl.decoder.Decoder.java", it's on their website. Very easy to use, just give the input path and the output path and it's done.
javazoom dot net (couldn't post more than one "hyperlink" on this website)
The big downside of this is of course that a huuge WAV file has to be created, and woe be unto thee if the MP3 happens to be 15 minutes or so... The WAV will be over 100 MiB (maybe even 200 MiB, haven't found out since I got a Java-out-of-memory-error, even though I gave the VM 512mb).
MP3 support in Java today please. Guess the reason they don't have it is because of copyright issues. Copyright really is slowing man down.
Also take a look at http://www.jsresources.org/
It provides a pretty good FAQ section about everything Audio in Java, and some example applications.