Ffmpeg threads

This article details how the FFmpeg threads command impacts performance, overall quality, and transient quality for live and VOD encoding. As we all have learned too many times, ffmpeg threads, there are no simple questions when it comes to encoding.

It wasn't that long ago that reading, processing, and rendering the contents of a single image took a noticeable amount of time. But both hardware and software techniques have gotten significantly faster. What may have made sense many years ago lots of workers on a frame may not matter today when a single worker can process a frame or a group of frames more efficiently than the overhead of spinning up a bunch of workers to do the same task. But where to move that split now? Basically the systems of today are entirely different beasts to the ones commonly on the market when FFmpeg was created.

Ffmpeg threads

Opened 10 years ago. Closed 10 years ago. Last modified 9 years ago. Summary of the bug: Ffmpeg ignores the -threads option with libx It is normal for libx to take up more CPU than libx This does not mean that libx is not using multithreading. With both builds Zeranoe and mine and both commands, i've got the same problem with -threads option: it uses both threads instead only one. Please test the same commands as I did to prove that -threads has no effect for you. With threads 2 or 8 uses the same CPU. Sorry but your original report is that -vcodec libx ignores -threads which is not the case.

Lol what. With threads 2 or 8 uses the same CPU.

Anything found on the command line which cannot be interpreted as an option is considered to be an output url. Selecting which streams from which inputs will go into which output is either done automatically or with the -map option see the Stream selection chapter. To refer to input files in options, you must use their indices 0-based. Similarly, streams within a file are referred to by their indices. Also see the Stream specifiers chapter.

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Ffmpeg threads

In addition, each codec may support so-called private options, which are specific for a given codec. Sometimes, a global option may only affect a specific kind of codec, and may be nonsensical or ignored by another, so you need to be aware of the meaning of the specified options. Also some options are meant only for decoding or encoding. In 1-pass mode, bitrate tolerance specifies how far ratecontrol is willing to deviate from the target average bitrate value. Lowering tolerance too much has an adverse effect on quality. Only write platform-, build- and time-independent data. This ensures that file and data checksums are reproducible and match between platforms. Its primary use is for regression testing.

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They can be represented with the following diagram:. Note that, depending on the vsync option or on specific muxer processing e. Or where else has this kind of approach been shown before? For example to copy metadata from the first stream of the input file to global metadata of the output file:. Decoding timestamp of the packet, as an integer. Thaxll 3 months ago root parent next [—] Does it can fix broken files? Presentation timestamp of the frame or packet, as an integer. Subjectively, me compressing my holiday video is much more important than Netflix re-compressing a million of them. Decoding time of the frame or packet, as a decimal number. If so, just let me know at [email protected] or via a comment below. It disables matching streams from already created mappings.

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If it outputs millions of tokens, how is someone going to actually review all of this? See also the setts bitstream filter. I most certainly have not. I could continue with this conversation, ask it to produce the full code for the hooks I have in my custom prompt to provide outlines and once the hooks are complete, ask it to rewrite the components using the shared code. It could have been a memory issue too - it only had 1GB assigned to the VM. As you can see, there's also a point of diminishing returns, so you'd have to adjust the -threads option for your particular machine. Use the -bsfs option to get a list of all bitstream filters. Not the answer you're looking for? Force input or output file format. I assume 1 process with 2 threads takes up less space on the die than 2 processes, both single threaded. It disables matching streams from already created mappings. I've always wondered if better multi-core performance can come from processing different keyframe segments separately. Stream specifiers are used to precisely specify which stream s a given option belongs to.