I am looking for some sites where I can download some short clips (5-20seconds) for testing purposes of video import routines.
Does anyone has some data sources for wmv, mpeg, mov, etc. ?
Thanks!
http://www.open-video.org/
http://www.archive.org/
http://reefvid.org/
Or just take some short vids with a digital video camera (or digital camera), import them onto your computer.
You can convert video files at http://www.zamzar.com/ to any format from any format.
Youtube, and convert it with ffmpeg
Or film trailers are often in mov (imdb: http://www.imdb.com/Sections/Trailers/ )
Or game trailers, gamershell / gamespot / ...
I was searching for this few days ago and here is best one I found:
http://www.jhepple.com/support/sample_movies1.htm
16 different files (two original samples), rather small sizes, covering most of popular formats.
MetaCafe allows you to download videos. I have some clips that I use for testing which are downloaded from there.
Some HD clips:
http://www.microsoft.com/windows/windowsmedia/musicandvideo/hdvideo/contentshowcase.aspx - Windows Media Audio and Video 9 Series, 1080p WMV files
http://www.apple.com/quicktime/guide/hd/ - H.264 in Quicktime containers
http://www.w6rz.net/ MPEG-2 Transport Stream Test Patterns
Related
I downloaded HDR10+(or Dolby vision) videos from YouTube.
Now I want to check the quality difference.
Although I don't have enough good HW display monitor,
I want to convert HDR10+(Dolby vision) video --> to HDR video.
(I heard that Dolby vision is better colors than HDR video.)
Can you share the command?
Thanks in advance.
I searched some ffmpeg command, and I found some command that converts HDR video to SDR video.
But there is no ffmpeg command HDR10+ video to HDR video.
I'm trying to make sense of something YouTube has listed on their recommended upload encoding settings for the best possible quality. Here's the link: https://support.google.com/youtube/answer/1722171#zippy=%2Caudio-codec-aac-lc
Specifically this line:
Channels: Stereo or Stereo + 5.1
I'm Googling for "Stereo + 5.1" and anything to do with ffmpeg but I can't seem to find much of anything.
I have trailers with surround audio I need to export for a client for YouTube.
You need to create a stereo downmix. (5.1 to stereo).
See https://trac.ffmpeg.org/wiki/AudioChannelManipulation#a5.1stereo
Then you combine your
video
audio (stereo) and
audio (5.1)
into one file with a total of 3 tracks.
I am studying on the source identification of video files especially about those from smartphones.
I got to know that the values in avcC box in .mp4 video files have the encoding options(h.264) which decoder must know when processing the encoded stream.
And I guess most of the smartphone uses the customized FFmpeg to encode the raw stream. I want to know if the values in the avcC box are affected only by the version of FFmpeg(if not customized version is used).
I didn't delve into this but think that the libavcodec.so in FFmpeg fill the values in avcC box when doing encoding(is this right?).
So what I want to ask is if two different smartphones use the same libavcodec.so(even in the case whether other .so files, .apk file used for the recording, etc are different) and two video files which have the same resolution were filmed from each smartphone, do the values in avcC box the same?
I think this question may equal to "are the values in avcC box affected by other FFmpeg library or other layers in overall Android framework"?
++ there is one more question! Is there any case that two videos which have same resolution from the same smartphone have different values in avcC box? (I suggest the the difference of encoding option originating from low-battery mode, execution conditions of other apps, etc and if any core developer customize FFmpeg for that.)
It would be a great help if anyone let me know the answer~!
the avcC box contains the out of band extradata for the AVC stream. This stores way more than just resolution, such as profile, level, entropy encoding mode, color space information, etc. This is a standard, ffmpeg just implements that standard. iPhones for example produce perfectly valid mp4 file and do not use libav* / ffmpeg. See exactly what is is the avcC box here Possible Locations for Sequence/Picture Parameter Set(s) for H.264 Stream
I have to record videos for a project I'm doing. Two of these are USB cameras and another is a n IP overhead camera.All three are connected to a laptop computer. After recording the videos I need to be able to open them in an editor (not for editing particularly but for modeling stuff in them for which I need a timeline). I have chosen Sony Vegas Pro for my editor. I have been able to record the uncompressed avi using gstreamer with this command:
gst-launch v4l2src device=/dev/video0 ! 'video/x-rawyuv,width=640,height=480,framerate=10/1' ! mux. avimux name=mux ! filesink location=temp.avi
I had to set the framerate to 10 because I was using two USB cameras and a framerate of 30 on both could not be accomodated in the bandwidth of the USB controller. I do not care about audio in my file so I don't grab audio. Similary, while encoding I wouldn't care about audio as well. This is raw uncompressed avi. I was not able to open this in Sony Vegas Pro. I believe I need to encode this uncompressed avi using a codec that will be opened by Sony Vegas Pro (I don't know which codecs Sony likes, so I'll probably try different ones until one of them opens).
For encoding this video, I have several options: mencoder, ffmpeg, gstreamer. But I am not able to figure out how to use these tools to get what I want. Ideally, I would like just to sort of "insert" a codec with other settings remaining the same. I don't really care about the how much space the resulting video takes since the length of the videos are not going to be more than 3 minutes and I have space available, so lossless codecs also work. I believe Sony reads mpeg avi's so if I can get that, it'll be great.
Thanks for reading and I appreciate all the help.
I was able to figure this out after some searching. It is based on the information here. I found that Sony Vegas pro seems to open avi videos encoded with the xvid codec.
I know I can play audio with MediaElement on wp7/8.
I'm looking for a way to grab audio samples.
By audio samples I mean decoded samples not the raw mp3 stream for example.
How can I do that ?
The short answer is no.
The longer answer is that would of course be possible if you implemented an audio decoder (e.g. MP3) as part of your app.