How can we find bitrate of a video file in c++? Can we do this by file handling?
Thanks
Install FFMEPG it will give you all the information related to the video
e.g.
ffmpeg -i filename.flv
If you want to implement such yourself you need to be able to read the video container format (Quicktime, ASF, AVI, Matroska etc) and try to find the bitrate from the metadata.
You can use ffprobe from the ffmpeg project to get the information about your video files and get a nice JSON ouput.
Check this answer for an example.
Related
I tried the following command in order to get the best video and audio quality (I can also avoid to write --format best because from the documentation I read that this is the default setting):
youtube-dl.exe --format best https://www.youtube.com/watch?v=7wfUUZvybPY
and I got a video.mp4 with the following characteristics:
I downloaded the same video by using 4k Video Downloader and I got:
How can I get the same result also by using youtube-dl?
You can parse all formats available with:
youtube-dl.exe -F https://www.youtube.com/watch?v=7wfUUZvybPY
Look at first column, "format code". For this video, best option is:
youtube-dl --format 315 https://www.youtube.com/watch?v=7wfUUZvybPY for 3440x1440 video, and
youtube-dl --format 140 https://www.youtube.com/watch?v=7wfUUZvybPY for 129kbit audio.
Then, with ffmpeg, you can merge that two streams in your preferred container (you can find many answers here in Stackoverflow).
For very high bitrates there isn't a file already merged available on YouTube, ffmpeg is a crucial tool for this type of conversions!
I am trying to record audio using C++ with openAL and save it as .wav file, so far i suceeded with first part, but can't find a way to save audio in a file. I read documentation and didn't find any way to do so. Am I missing something?
To save a *.wav file, you don't really need OpenAL. Look at the *.wav type-specifications, which are all over the web. You have just to create a header which describes your data and paste in your recorded data.
I'm trying to work on loopback capture(What you hear) and record this file in mp3/aac format using VC++.
->I can capture audio and can create a .wav file i.e. not compressed but I want a compressed file so I'm encoding this through ffmpeg to write an mp3 file not a .wav.
However I'm not getting any way to do it directly?
I referred this for loopback capture.
Please share your experience and opinions.
Thanks!
I'm trying to get list of QVideoFrame in Qt from a video file (doesn't really matter what format). I've looked at http://doc.qt.digia.com/qt/qvideoframe.html to find some information about QVideoFrame, but I can't find any information on how to make QVideoFrames from video file.
This example is old, but it should be decent starting point.
I was wondering, how would I combine recorded audio and video into one if I have them in separate files? Preferably using OpenCV and PortAudio/libsnd.
Thanks in advance.
FFmpeg is used to decode and encode almost all popular formats. It can be used as an alternative to all of these. PortAudio will probably only be useful for audio playback, so unless you need to play the stuff back it won't be needed. In case you do need A/V playback, FFmpeg is also good (VLC uses it.)
You can refer ffmpeg
On linux try mencoder usually part of the mplayer package. It is fairly straight forward to use after reading through its man page.