The libavformat library provides some generic global options, which can be set on all the protocols. In addition each protocol may support so-called private options, which are specific for that component. Set a ","-separated list of allowed protocols. Protocols prefixed by "-" are disabled. All protocols are allowed by default but protocols used by an another protocol nested protocols are restricted to a per protocol subset. Protocols are configured elements in FFmpeg that enable access to resources that require specific protocols.
When you configure your FFmpeg build, all the supported protocols are enabled by default. You can list all available ones using the configure option "—list-protocols".
A separate AMQP broker must also be run. Where hostname and port default is is the address of the broker. The default for both fields is "guest". Sets the exchange to use on the broker.
RabbitMQ has several predefined exchanges: "amq. Sets the routing key. The default value is "amqp". The routing key is used on the "amq. Default is Minimum is and max is any large value representable by an int. When receiving packets, this sets an internal buffer size in FFmpeg. It should be equal to or greater than the size of the published packets to the broker.Streaming audio with ffmpeg rtp
Otherwise the received message may be truncated causing decoding errors. The timeout in seconds during the initial connection to the broker. For example to read a sequence of files split1. Data in-line in the URI. Depending on the build, an URL that looks like a Windows path with the drive letter at the beginning will also be assumed to be a file URL usually not the case in builds for unix-like systems.
For example to read from a file input. Truncate existing files on write, if set to 1.
A value of 0 prevents truncating. Default value is 1.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Calculating this with both implementations. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Conversation 3 Commits 1 Checks 0 Files changed.
Copy link Quote reply. Reverting commit '2edaded98cdf' solves the problem. RTCP synchronization packet was broken since commit in ffmpeg version… …. This comment has been minimized. Sign in to view. Calculating this with both implementations give different results.
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Extract RTCP stats from AVFormatContext
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Outdated suggestions cannot be applied.Search everywhere only in this topic. Advanced Search. Classic List Threaded. Daniel Oberhoff Hi, We tried this via the docs but got lost heavily. We need the actual wall clock time of video data from a camera which delivers via rtsp. I have read around that there are things like RTCP sender reports and such on the low level containing this info, and I have seen indication that it is somehow parsed by ffmpeg. What is the easiest way to get to this information?
Best wpuld be command line dump of the time of the first frame, but rendering it somewhere, or even hacking ffmpeg would be doable too. Very thanlful for help, as we really need this to sync the video data to sensor data form other sources. Moritz Barsnick.
Re: getting wall clock time from rtsp stream. Yes, ffmpeg's source code fits to those findings. So you would actually have to edit the source. That assumes this PTS is useful for you it's easy to extract from the first frame via ffprobebut at least it would be flexible.
Ok, yeah, sounds like work and a litle cumbersome for production use, but yeah. I was thinking and googling a bit more about my thoughts I'm not sure the PTS is a good place to store a "real" time, but I couldn't find much info on that. Yet ffmpeg would need to gain a capability to forward the value and to write this, I think.
You could also consider an option to add the wallclock to stream metadata automatically - this wouldn't get lost along the way, and could automatically land in the output stream. But go ahead, do suggest something to devel, and let's see what they think is sane.
The ntp is really important for synchronization, and it would be cool if we would not have to patch our own ffmpeg. I would like to propose a patch to devel for this. Free forum by Nabble.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
Already on GitHub? Sign in to your account. Posting this here because I've seen many people comment on this problem online wrt ffmpeg and rtsp streaming over udp. There isn't a single solution to this problem online that I could find. After reading the ffmpeg documentation I stumbled upon the solution. This might be a good thing to add to the wiki under troubleshooting:. By default the udp buffer size that ffmpeg uses is not large enough to hold an entire frame's worth of data for an HD image at a reasonable bitrate.
The symptom is that the received image will be smeared down from some point vertically. It may not happen on all frames. That seems to work ok for a 2Mbps feed, 5fps, color, at p. Increase if you're still getting smeared images.
Want to back this issue? Post a bounty on it! We accept bounties via Bountysource. Looks more like a bug in the ffmpeg library. I post it anywhere I see people with smearing issues with ffmpeg. One day I will debug ffmpeg and find why. I tried your suggestion and so far it seems to be working.
Yes was just letting you know how to set TCP without using Options field as that drop down is controlling it. Most stuff I have seen points to the introduction of the circular buffer here as when smearing issues started. Others also talk about some OS buffers, but have not had time to track it down. Yup - same thing happens for me too. Thanks to a little project I keep an eye on I finally got around to testing this some more. I saw this little snippet a while back and made the change last week.
Going to monitor it for a while then try on my main machine. Using FFplay was helpful to confirm it could work with ffmpeg then was just a case of replicating. Also, any idea why the kernel's UDP buffer makes a difference? Shouldn't the kernel be delivering the UDP datagrams to ffmpeg, and leaving the responsibility to ffmpeg to wait until it has received an entire video frame before rendering it on screen?
I would appreciate it if you could share your understanding of the issue, and whether or not a fix is possible or if the fix is to just increase the OS buffer as you've done. Also, do you have any guidelines for setting an appropriate buffer size, based on the bit rate, resolution, and frame rate of the video? Could that be the root of the problem?
But they reference net. Using net. This may have unintended consequences for server ram usage as each connection will default to the larger size. Reflecting back on it we don't need to play with wmem values, it just happens the project that put me onto this does read and write streams.
I really think more testing is needed to clarify exactly what the root cause is, a couple of options I can think of:.While RTP is a pretty well established standard, not all extensions and operation modes are necessarily supported by all implementations.
We'll be having a look at how these are handled by some of the best known open-source multimedia tools, FFmpeg and GStreamer : what are the characteristics and shortcomings of their RTP implementations, bugs, things to keep in mind, etc. Using these tools can be somewhat confusing or complex for the uninitiated, though.
The matter of fact is that media processing in and of itself is a complex topic, and tools like FFmpeg or GStreamer couldn't do much to smoothen this without at the same time compromising on their feature set. You still need to know what is a codec, a parser, a filter, etc.
All the examples shown here will be formatted for a Linux terminal. Before heading directly into practical examples of RTP streaming, we have to talk about transcodinga concept that ends up appearing sooner or later around the topic of media streaming. Transcoding is the act of transforming one media encoding format directly to another. This is typically done for compatibility purposes, such as when a media source provides a format that the intended target is not able to process; an in-between adaptation step is required:.
Here, we have a Matroska file video.
However, our consumer is only able to process MP4 files with video encoded with H. A transcoding step is needed to convert between these: video and audio need to be re-encoded with correct codecs, and the results have to be stored in the proper container format.
The video and audio tracks are extracted " demultiplexed ", in the multimedia jargon from the container and then streamed as-is, without first reintroducing or " multiplexing " them into any container. Modern codecs are incredibly sophisticated and able to obtain huge savings in file size without introducing much quality loss due to compression, but doing so comes at a high cost in terms of computational resources.
While at first sight it seems that transcoding might be always a good thingbecause it makes sure that our media will be compatible with the limitations of our consumers, the fact is that the transcoding step will rapidly saturate the CPU as soon as several streams need to be processed at the same time.
It is our job as developers or software architects to decide whether transcoding is required and really necessary, and it's always a good idea to minimize the number of cases where it is enabled.
RTP/MPEGTS streaming with FFMPEG
FFmpeg describes itself as A complete, cross-platform solution to record, convert and stream audio and video. It is a library that can be used as dependency for our software projects, providing a lot of powerful functionality for media processing; but it also offers a command-line program which can be used to access its power without having to write any code.
As of this writing, the latest version is FFmpeg 4. On Linux, some distros might still provide old versions of FFmpeg 2.
Similarly, you should always try to use the latest version for Windows or Mac systems.In the private RTSP code, the control, synchronization, etc.
The real-time transport protocol real-time Transport Protocol is a Transport layer protocol for multimedia traffic on the Internet. The RTP protocol details the standard packet format for transmitting audio and video over the Internet. RTP itself does not provide on-time delivery mechanisms or other quality of service QoS guarantees, and it relies on low-level services to implement this process. RTP does not guarantee the transmission or prevention of out-of-order transmission this means that RTP packets may be unordered on the wayand the reliability of the underlying network is uncertain.
RTCP periodically transfers control data between participants in a streaming multimedia session. RTCP's main function is to provide feedback on the quality of service provided by RTP Quality of servicesand to synchronize audio and video. RTCP collects statistics on related media connections, such as: number of bytes transferred, number of packets transmitted, number of packets lost, jitter, unidirectional and bidirectional network latency, and so on.
Network applications can use the information provided by RTCP to try to improve the quality of services, such as restricting information traffic or using smaller codecs instead of compression. The RTCP itself does not provide data encryption or identity authentication. SRTCP can be used for such purposes. Secure Real-time transport protocol secure real-time Transport protocol or SRTP is in real-time transport protocol real-time Transport protocol or RTP is a protocol defined to provide encryption, message authentication, integrity assurance, and replay protection for data in a live transport protocol in unicast and multicast applications.
Because the real-time transport protocol and the real-time Transport Control Protocol RTP Control Protocol or RTCP are closely linked, the secure real-time transport protocol also has a companion protocol, which is known as secure real-time Transport Control Protocol secure RTCP or SRTCP The secure real-time transport Control Protocol provides similar security-related features for real-time transport control protocols, just as the secure real-time transport protocol provides for real-time transport protocols.
Enabling the use of secure real-time transport protocol SRTP or secure real-time transport Control Protocol srtcp is optional, but even with secure real-time transport protocol SRTP or secure real-time transport Control Protocol srtcp, all of the features they provide such as encryption and authentication are optional, These features can be used independently or disabled.
The only exception is that when using secure real-time transport Control Protocol SRTCP, its message authentication feature must be used. Live Streaming Protocol RTSP real Time streaming Protocol is a multimedia streaming protocol used to control sound or imagery, and allows simultaneous multiple streaming requirements controland the network communication protocols used in the transmission are not within the scope of their definition, The server side can choose to use TCP or UDP to transmit the stream contentits syntax and operation is similar to HTTP 1.
In addition, the previously mentioned allow for simultaneous multiple stream demand control multicastbesides reducing the server-side network usage, it can support multi-video conferencing video Conference. Because it works in the same way as the HTTP1. RTSP's request mainly has describe,setup,play,pause,teardown,options and so on, as the name implies can know the dialogue and control role.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am using the ffmpeg C library. Is there any method or structure in the ffmpeg that gives me this information?
I am completely stuck but I am not able to solve that problem. Learn more. Asked 6 years, 4 months ago. Active 10 months ago. Viewed 2k times. Any help will be appreciated. Thanks in advance. Active Oldest Votes. Siong Thye Goh 2, 10 10 gold badges 15 15 silver badges 24 24 bronze badges. Which file did you patch for this? Would you mind sharing the patch? Thanks in advance. Hi Arun. This was a loooooooooong time ago. I spend like daaaaaays to solve this.
Lots of hacks, but it worked. Good luck! I wish this was exposed as an API by the library itself. Nevertheless, thanks. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.