I have .asf files. All of them have 2 video streams and 1 audio stream in it. I need to extract that .asf into 2 .flv files (first one is video stream, second one is second video + audio stream).
Is there some free program with funcitonality like this where I can choose which streams I want to extract/convert to .flv. I've tried at least 15 programs and all of them open my .asf file and offer me to convert it but none of them "knows" about that second video stream. Some programs opens my .asf and in external window open second video stream but not offering any functionallity to it. It's like they aren't aware of that second video stream.
I don't want to write my own program with Xuggle if I don't need to.
Thank You,
Dino
Let me answer this old question. On Windows download the program Haali Muxer and split the file as you want. Then there are many converters to .flv format but now there is only one video and audio stream in source file after splitting it with Haali Muxer.
Related
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'm trying to save 5 seconds .mov segments of an RTSP stream with VLC. First I tried openRTSP and ffmpeg but both of them gives incorrect output (Index missing etc). I've read a lot of the VLC cli, but havn't had any luck of saving an RTSP stream as segments.
If I use the VLC GUI I can both save segments as saving snapshots (PNGs) but I need to do this via CLI.
mov files are not streamable. [they are right in saying index file missing]. I don't even know how you are sending them over rtsp there is no rtp payloader i am aware of for mov/mp4 format.
I want to merge two recorded audio files (.caf)in an iphone .is there any solution?for recording am using avaudioplayer.
answered By: MidHere
You can do it using ExtAudioFileService. In ios developer library they had provided two examples to convert one audio file to another format. In these they are opening one audio file for reading and another file for writing (converted audio). You can change or updated code to read from two files and write them to one out put file in same format(caf) or compressed format. First you have open first audio file and read every packets from it and write it to a new audio file. After finishing first audio file, close the file and open second audio file for reading. Now read every packets from second audio file and write to newly created audio file and close second audio file and new audio file.
Please find the links(1,2) for these sample codes .... Hope this helps you...and good luck. :)
I am using AVAudioRecorder for recording audio in .caf format. When the user will resume this recording the new recording must append with the old recording. So how can i combine two .caf audio files.
You can do it using ExtAudioFileService. In ios developer library they had provided two examples to convert one audio file to another format. In these they are opening one audio file for reading and another file for writing (converted audio). You can change or updated code to read from two files and write them to one out put file in same format(caf) or compressed format. First you have open first audio file and read every packets from it and write it to a new audio file. After finishing first audio file, close the file and open second audio file for reading. Now read every packets from second audio file and write to newly created audio file and close second audio file and new audio file.
Please find the links(1,2) for these sample codes ....
Hope this helps you...and good luck. :)
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.