Ip Video Transcoding Live V5 18
Kody Coste
Transmuxing goes by many names, including transcode-multiplexing, repackaging, and packetizing. Repackaging is possibly a more apt name as this process involves repackaging data into a different file container or delivery format. For example, you could use MPEG-TS containers for an HTTP Live Streaming (HLS) stream and change them to fMP4 containers for Dynamic Adaptive Streaming over HTTP (MPEG-DASH). As different playback devices work with different streaming protocols and containers, this is an effective method for ensuring your media is more widely accessible.
Using a transcoding software or service, you can simultaneously create a set of time-aligned video streams, each with a different bitrate and frame size, while converting the codecs and protocols to reach additional viewers. This set of internet-friendly streams can then be packaged into several adaptive streaming formats (e.g. HLS), allowing playback on almost any screen on the planet.
The biggest benefits of transcoding are best understood through the lens of ABR. This strategy builds out a variety of media file versions for streaming to a wide range of devices across different end user bandwidths. ABR is an excellent example of how various forms of transcoding, including transizing and transrating, work together to improve a stream.
Diversifying bitrates and resolutions makes it possible to not only reach more devices, but also stream more effectively (and at the highest possible quality) across those devices. Your stream (live or otherwise) will no longer be at the mercy of heavy buffering caused by unexpected dips in bandwidth. This is especially effective for live streaming, as an uninterrupted viewer experience is essential to its promise.
Ultimately how beneficial transcoding is for your stream will depend on your use case and target audience. However, the adaptive and scalable benefits of transcoding typically outweigh the added steps in your workflow.
Wowza provides robust live transcoding software capabilities to power any workflow. With Wowza Video, you get a one-stop integrated solution for transcoding, content management, delivery, playback, and end-to-end analytics. We also offer Wowza Streaming Engine media server software for organizations that need to deploy a software solution on premises or offline. Either solution could be right for you, depending on your unique needs.
This depends on the software you use, whether you are transcoding with lossy or lossless compression, and the size of the video files going in. In any case, transcoding does take time, which is part of makes live transcoding so tricky.
Twitch, like many other live streaming services, receives live stream uploads in Real-Time Messaging Protocol (RTMP) from its broadcasters. RTMP is a protocol designed to stream video and audio on the Internet, and is mainly used for point to point communication. To then scale our live stream content to countless viewers, Twitch uses HTTP Live Streaming (HLS), an HTTP-based media streaming communications protocol that most video websites also use.
Within the live stream processing pipeline, the transcoder module is in charge of converting an incoming RTMP stream into the HLS format with multiple variants (e.g., 1080p, 720p, etc.). These variants have different bitrates so that viewers with different levels of download bandwidth are able to consume live video streams at the best possible quality for their connection.
FFmpeg ( ) is a popular open-source software project, designed to record, process and stream video and audio. It is widely deployed by cloud encoding services for file transcoding and can also be used for live stream transmuxing and transcoding.
hls_list_size is used to determine the maximum number of segments in the playlist (e.g., we can use 6 for live streaming or set it equal to 0 to have a playlist of all the segments). The segment duration (the optional hls_time flag) will be same as the IDR interval, in our case is 2 seconds.
Since H.264 is a lossy compression standard, transcoding will inevitably trigger video quality degradation. Moreover, encoding is a very computationally expensive process, particularly for high resolution and high frame rate video. Due to these two constraints, we would ideally like to transmux rather than transcode the highest variant from the source RTMP to save the computational power and preserve the video quality.
If we wanted to transmux instead of transcode the highest variant while transcoding the rest of the variants, we can replace the the first output configuration with the previously specified copy codec:
The two transcoded variants 720p60 and 720p30 in this example can share one scaler. As gathered from experiments, scaling is a very computationally expensive step in the transcoding pipeline. Avoiding the unnecessary repeated scaling process altogether can significantly optimize the performance of our transcoder. Figure 8 depicts a threading model of combining the scalers of 720p60 and 720p30 variants.
But I now tried to enable "direct Live TV" in the Android TV app. Then on dashboard, I see it direct plays. When I try to pause, it of course says it canot be done, and asks if I want to switch to Seek Mode. When doing that, in the dashboard I see it again begins to transcode. But now with a reason for transcoding, saying something like media bitrate is above limit.
IPVTL handles all kinds of media streaming formats, from video clipsand DVB capture/tuner cards, to internet streaming protocolsHTTP, FTP, MMS, RTSP, RTMP, RTP, NDI, SRTand MPEG-TS (DVB-S). It can do live streamingto most popular internet live tv/video providers listed below (youtube, twitch,facebook, ...), as well as to local network CCTV / DVB / IRD devices(Dreambox andBlackmagic Decklink cards).
ffmpeg is flexible encoder you can tweak it much you like , it's up to encoding algorithm and Size VS Quality battle , I think now days X264 are more efficacy than it was before , the important tweaks with ffmpeg to speedup encoding is -preset the default is medium you can use fast or faster and watch the quality of your output video . I have live steaming video and I use this command
In that question linked above, you can see that Safari requests weird chunks of the file, including the ending few bytes. This poses a problem in that the web server WOULD have to wait for the conversion to finish, in order to deliver the final bytes of the file to conform to the Range request.
So my question is, is my train of thought right? Is there a better way to deliver transcoding content to an or tag that wouldn't involve waiting for the entire conversion to finish? Thanks in advance!
I recently run into the same issue since I want to serve my library to browsers. Surprisingly, the idea to send the stream through ffmpeg and deliver on the fly works quite well. The primary problem was to support seeking...
Maelstrom is a high-quality video transcoder and live stream transcoder, built into Jet-Stream Cloud. With its powerful combination of modern cloud technologies and the efficiency of hardware acceleration, MaelStrom ensures that you experience the best from both worlds. Your source is converted into multiple qualities, for HTTP adaptive bit rate video streaming and live streaming. You pay per minute output, no reservation slots needed.
Plenty of advanced technologies are used in the video streaming industry. Video transcoding is one of the cores of them. The technologies related to video streaming are very advanced, complex, and hard to understand for streamers. But when streaming with Castr and engaging with our blog, we make the complex processes easy in simple terms.
Video transcoding is the process of converting video content from one format to another to extend device compatibility. Video streamers transcode videos from one format to another to ensure the best streaming experience. This video conversion technology reduces the size of video files without sacrificing quality. During the editing process, an encoded video is edited and converted to another format to make it more compatible with different devices.
Regarding video streaming, the terms transcoding and encoding confuse many streamers. Simply, video encoding is a compression process. On the other hand, video transcoding is a conversion process. The video encoding process reduces the size of video and audio files without sacrificing quality and stores the video in a digital file format. On the other hand, video transcoding is a process that converts the video format from one to another.
Another way to distinguish transcoding and encoding is that encoding takes an analog file and converts it to a digital format. Meanwhile, transcoding converts a digital file (or an already encoded file) into another digital format, from a Flash file to an MP4.
The process of video transcoding has several stages. These stages can be divided into two major parts- first, the source video must be encoded and then transcoded. The whole process of transcoding is divided into the following steps:
The first step in every converting or compression process is to upload the raw video file. For transcoding a video, it needs to upload on a video transcoding software that will process your content. Later, you can choose the output options according to your requirements.
Before transcoding, the video needs to be encoded first. The transcoding process converts one digital encoding format to another. Through encoding, videos are highly compressed and optimized for streaming, thus providing a smaller file size for smoother live streaming.
A codec (a portmanteau of coder/encoder) refers to a device or software program that encodes or decodes a digital data stream. In transcoding, video and audio codecs are used for data transmission, storage, encryption, and playback or editing.
Video transcoding is essential to streaming video content. It plays a significant role in delivering a high-quality viewing experience. The transcoding process involves converting a video file from its original format into another format compatible with different devices and streaming platforms. This ensures the video can be played back smoothly and efficiently. Moreover, a transcoded video ensures an excellent experience with slower internet connections and lower processing power of devices.
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