I'm building some YouTube search functionality into an iPhone app and want to ensure that I only receive results that will be playable on the device. According to the Searching for videos section in the API reference doc this seems to be relatively straightforward:
The format parameter specifies that videos must be available in a particular video format. Your request can specify any of the following formats:
I've tried setting "format=1" to limit to:
RTSP streaming URL for mobile video playback. H.263 video (up to 176x144) and AMR audio.
This provides a high proportion of playable videos but some are still unplayable and I'm worried that it's not returning others that would be playable.
When I leave the format field blank I receive an even higher proportion of non-streamable URLs.
This does not sound appropriate. My understanding is that iPhone does not stream RTSP rather it supports Apple's HTTP Streaming of segmented files for live and HTTP streaming of MPEG4 video files via range requests. I'd also expect the video to be H.264 and AAC audio.
Your setting sounds appropriate for low-end cellphones In particular, the 176x144 is a QCIF resolution commonly used on non-smartphones.
When you look at the XML file returned by a call to
http://gdata.youtube.com/feeds/api/videos/<your video id>
then you will notice that videos which are not playable on the iPhone will have the following tag:
<yt:state name='restricted' reasonCode='limitedSyndication'>Syndication of this video was restricted by its owner.</yt:state>
Just make sure to look for the above tag and ignore the video if the tag is present.
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 want to play youtube video with a certain resolution, like 360p
and capture the packets, and then extract the video from the packets
and then I want to analyzing/retrieving flash/html5 video information/metadata from these videos
BTW, are videos still with the same resolution when they are extracted from the captured packets?
note that these videos may not be complete
are there any good tools for analyzing/retrieving flash/html5 video information/metadata
like video bit rate, video resolution(like 360p, 480p), used audio/video codecs, video size and duration/duration
if the video is not complete, the information would ideally include the original video size, the actual video size, the original video length/duration and the actual video length/duration
I hope it is a script, if it is a tool. I hope it can be run through shell using command line coz I want automation.
A paper says perl could do this, but I don't how
thanks!
(long comment, not a complete answer)
IANAL, but your goals may not fit the YouTube Terms of Service:
Section 4. C
You agree not to access Content through any technology or means other than the video playback pages of the Service itself, the Embeddable Player, or other explicitly authorized means YouTube may designate.
Section 4. H
You agree not to use or launch any automated system, including without limitation, "robots," "spiders," or "offline readers," that […] sends more request messages to the YouTube servers […] than a human can reasonably produce in the same period by using a conventional on-line web browser. Notwithstanding the foregoing, YouTube grants the operators of public search engines permission to use spiders to copy materials from the site for the sole purpose of and solely to the extent necessary for creating publicly available searchable indices of the materials, but not caches or archives of such materials. […]
You may be able to access the required information directly using the YouTube Data API. Here is a reference, and here is a list of directly supported programming languages. Perl will work as well, as the underlying data format is plain XML or JSON.
You might also find these SO questions YouTube Player API: How to get duration of a loaded/cued video without playing it? and Youtube API get video duration from the XML enlightening.
I'm interested in setting up a streaming video server (perhaps on a cloudfront server) with videojs. I understand that flash video can be streamed, however, is it possible to stream video using videojs and a different codec? (like h246). I tried looking through the videojs documentation and forums but did not find any additional info.
Video.js has limited support for RTMP streaming in Flash, but hopefully more in the next few months.
HTTP Live Streaming (HLS) is the most supported streaming format for HTML5 (iOS, Safari, latest Android). Video.js can support that on the devices that support HLS natively.
I think you would have to transcode the h264 file on the fly to get the effect you want. Subsonic is a program which will read your file structure, display your videos and music in a webui, transcode the audio/video and stream it--but it uses jwplayer, not videojs.
However, it is opensource, so if you want to try to modify that, I'm sure it would be possible.
Just wondering what format is accepted as "the best" to have your video content on. We currently have our videos in FLV format being played by a JW Player. Are FLV's iPhone compatible or should we be encoding in another format? Thanks!
FLV video is not supported on the iPhone. H.264 should be you choice if you plan on targeting the iPhone.
If you're looking into streaming the video have a look at Apple HTTP streaming which is supported by the iPhone.
HTTP Streaming Architecture - Might need Apple ID to view it.
According to the iPhone SDK, You can use -
Media Player framework to display
full-screen video from files in either
H.264 (Baseline Profile Level 3.0)
format or MPEG-4 Part 2 video (Simple
Profile) format.
So I gather that the FLV video is not supported on the iPhone and you should encode the videos in one of these two formats. Also note that only full-screen video playback is supported on the device, with a fade-in transition to the player when video is started.
I want to play H.264 video streamed from network. To play video iphone provides the media player API. Does anyone one aware of any documented or undocumented API for decoding and playing single video frame?
Is it Live video or on demand ?
If live the only way is to use iPhone OS 3 with MediaPlayer.
take a look at the discussions group from apple there is some interesting thread.