I am currently recording a vnc sessions using vnc2flv. But the flv file i get is very huge in size. For a recording of 5 seconds the file size is around 10 mb. What values should i provide for the paramters so that i get a proper flv file. Also the flv file generated is not playable using vnc media player
Related
When uploading an app preview to the app store submit process, I receive an unknown error MOV_RESAVE_CORRUPTED which is not documented anywhere in their uploading process.
I have captured the preview using QuickTime and had to reformat it using ffmpeg to a 30 FPS video, using this command
ffmpeg -r 30 -i preview1.mov -acodec copy -crf 12 -vf scale=886:1920,setsar=1:1 preview1-edit.mp4
The video is working fine on my local machine but upload won't work.
Frankly, the whole process is very annoying and super stressful. Hopefully I can help anyone else having this problem with this thread.
Thank you.
SOLUTION: In my case the issue was the audio encoding, used Handbrake free video tool and ensured the video specs were set to:
Video Codec (FPS) to : H.264(x264) Video Framerate (FPS) to : 30 Audio Codec to : AAC (Core Audio) Audio Mixdown to : Stereo Audio Sample rate to : 44.1 Audio Bitrate to : 256
The app preview videos are working fine now!
Create a new Preset. Set name iPhone 6.5 App Preview to recognize easily.
Select Audio Behavior. Set samplerate to 44.1, bitrate to 256. Then save it
Go to Audio tab. Then select Presets from right up corner.
Check audio samplerate and bitrate then click Start. Then upload it.
App Store Connect is very tough about video formats, only accepts H264 + AAC in mp4 or mov container, otherwise it just says (after 10 minutes): MOV_RESAVE_CORRUPTED. See details: https://help.apple.com/app-store-connect/#/dev4e413fcb8
I want to play the video simultaneously while it is downloading via unitywebrequest. Will AVPro video support this? If so please provide me some guidance, as i am new to unity and avpro video. I can able to play the video which is downloaded fully through FullscreenVideo.prefab in AVPro demo. Any help will be much appreciated.
There are two main options you could use for displaying the video while it is still downloading.
Through livestream
You can stream a video to AVPro video using the "absolute path or URL" option on the media player component, then linking this to a stream in rtsp, MPEG-DASH, HLS, or HTTP progressive streaming format. Depending on what platforms you will be targeting some of these options will work better than others
A table of which file format supports what platform can be found in the AVProVideo Usermanual that is included with AVProVideo from page 12 and onwards.
If you want to use streaming you also need to set the "internet access" option to "required" in the player settings, as a video cannot stream without internet access.
A video that is being streamed will automatically start/resume playing when enough video is buffered.
This does however require a constant internet connection which may not be ideal if you're targeting mobile devices, or unnecessary if you're planning to play videos in a loop.
HLS m3u8
HTTP Live Streaming (HLS) works by cutting the overall stream into shorter, manageable hunks of data. These chunks will then get downloaded in sequence regardless of how long the stream is. m3u8 is a file format that works with playlists that keeps information on the location of multiple media files instead of an entire video, this can then be fed into a HLS player that will play the small media files in sequence as dictated in the m3u8 file.
using this method is usefull if you're planning to play smaller videos on repeat as the user will only have to download each chunk of the video once, which you can then store for later use.
You can also make these chunks of video as long or short as you want, and set a buffer of how many chunks you want to have pre-loaded. if for example you set the chunk size to 5 seconds, with a buffer of 5 videos the only loading time you'll have is when loading the first 25 seconds of the video. once these first 5 chunks are loaded it will start playing the video and load the rest of the chunks in the background, without interrupting the video (given your internet speed can handle it)
a con to this would be that you have to convert all your videos to m3u8 yourself. a tool such as FFMPEG can help with this though.
references
HLS
m3u8
AVPro documentation
I am developing a video app. Some video files having a long (43 minuite) duration and some files are less than 10 min duration.
Apple suggested if video duration is more than 10 min they want me use Httplive streaming. I am placing video control in web view and am loading the URL.
If I used large video files in MP4 format, will I get any problems? And what video size do I need to use that both iPhone and iPad orientates.
Can you suggest me video size, duration, and formats. Thanks in advance.
Apple will reject any app that doesn't use HTTP Live Streaming for videos longer than 10 minutes. So if you're using the native video player then you'll have to encode your video files accordingly.
I have a doubt jwplayer can read only flv files or it can read every files
With over one million active users,
the JW Player™ is the Internet's most
popular and flexible open source media
player. It can support playback of any
format the Adobe Flash Player can
handle (FLV, MP4, MP3, AAC, JPG, PNG
and GIF).
http://www.longtailvideo.com/
EDIT
If you need to deal with any other formats, you can run the conversions server side using ffmpeg
Reference
http://www.ffmpeg.org/
This is related to my another question
Here I'd like to ask if it is in theory (according to video file formats and codecs, etc) possible to have such scenario:
1) Client on iPhone has a reference to video in flv format. It sends http request to converting "proxy" like http://convproxy.com?source=url_of_original_video.flv by just clicking such link in Safari
2) Converting proxy starts downloading that flv file and converting it to mp4 (which iphone understands) on the fly, returning converted portion as http response, so iPhone can immediately start playing it, before entire flv is downloaded and converted.
I was playing with ffmpeg trying to do such thing, and it indeed converts flv and produces mp4 file, however that mp4 file can not be played until convertion is finished or ffmpeg is stopped. If I just kill ffmpeg process the mp4 file can not be played. If I let it finish or press ctrl-c to stop it, the part that was downloaded and converted can be played. Seems like ffmpeg does some job after it receives stop signal. Is that a necessary part of mp4 format or it can be done differently? I see that iPhone can stream video, by starting playing before the entire file is downloaded to it, so in general it seems like possible scenario for me.
I short words, I can convert flv file to mp4 file, and the question is if I can convert flv stream to mp4 stream.
According to wikipedia, the MP4 container format requires a separate "hint track" to enable streaming. I assume ffmpeg writes this at the end of the conversion. If the iPhone OS requires this track to stream, I don't see a way to stream live video outside of using a different format and having a custom decoder on the iPhone side similar to how the Orb client for iPhone does it.