Ffmpeg Libx264

FFmpeg and how to use it wrong | VideoBlerg


Nov 10, 2017 · I've been in the streaming media industry since 2008 and have seen a lot of misinformation regarding both FFmpeg and libx264. In this post I hope to help shed some light on what does and does not work. Streaming media, at it's core, requires three basic things. 1) Constant frame rate. 2) An even keyframe…

#261 (ffmpeg now sets libx264 open_gop=1 by default) – FFmpeg


x264 default is closed gop (open_gop=0), ffmpeg defaults to open gop unless -flags +cgop is specified. This commit e25c67108a77b2dbf13de1339b5314d07e3ffa02 applies the ffmpeg setting to libx264, and changed all the libx264 ffpresets to specify +cgop so the x264 default remained the same.

CompilationGuide/MinGW – FFmpeg


Once you installed all the necessary packages (MinGW is the only strict requirement for building FFmpeg, git is required to update your FFmpeg source), you need to open a MinGW shell, change directory to where you checked out the FFmpeg sources, and configure and make FFmpeg the usual way. Note that under MinGW, configuring can be painfully slow.

Encode/H.264 – FFmpeg


The goal of this H.264 video encoding guide is to inform new users how to create a high-quality video using the encoder x264.There are two rate control modes that are usually suggested for general use: Constant Rate Factor (CRF) or Two-Pass ABR. Rate control decides how many bits will be used for each frame. This will determine the file size and also how quality is distributed. To know more about what the different rate control modes do see ​this post.If you need help compiling and installing...

Can I use FFmpeg in a commercial product? - Video ...


Yes, you can use FFmpeg in a commercial product. FFmpeg is licensed under the GNU Lesser General Public License (LGPL) version 2.1 or later.Some features, such as support for some external libraries (libx264 and libx265 for example) and various filters, are covered by the GNU General Public License (GPL) version 2 or later (see commercial x264 license exception below).

ffmpeg Documentation


There are three output files specified, and for the first two, no -map options are set, so ffmpeg will select streams for these two files automatically.. out1.mkv is a Matroska container file and accepts video, audio and subtitle streams, so ffmpeg will try to select one of each type. For video, it will select stream 0 from B.mp4, which has the highest resolution among all the input video streams.

FFmpeg : Error occurred while encoding audio stream from ...

video.stackexchange.com/questions/15979/ffmpeg-err ... curred-while-encoding-audio-stream-from-ac3-to-aac

I am using following command to encode my video to h264 and aac audio codec : ffmpeg -i sample.mp4 -codec:v libx264 -profile:v high -level:v 4.0 -codec:a libvo_aacenc -b:a 128k output_file.mp4

Windows - FFmpeg で mjpeg から mp4(libx264) への変換|teratail


FFmpeg で mjpeg から mp4(libx264) への変換を行うと、Windows・Macで再生が出来なくなりました。 アイコンにはサムネイルも表示されません。しかし、HTML5のVideoタグでは、再生が可能です。 なぜ …

x264 FFmpeg Options Guide - Linux Encoding


Please Note: This guide will remain here for historic purposes but FFmpeg and libav now use libx264's internal -preset, -profile and -tune options. Please see `avconv -h | less` or `ffmpeg -h | less` and scroll down to "libx264 AVOptions:".. This guide maps most of x264's options to FFmpeg's options along with detailed descriptions by x264 developer Dark_Shikari.

x264EncodingGuide – FFmpeg


Last modified 6 years ago Last modified on May 28, 2014, 10:25:17 PM. Tags; h264; libx264; x264; Download in other formats: Plain Text

How to Install and Use FFmpeg on Ubuntu 18.04 | Linuxize


Dec 20, 2019 · This is the easiest way to install FFmpeg on Ubuntu. However, the version included in the repositories may lag behind the latest version of FFmpeg. At the time of writing this article, the current version of FFmpeg available in the Ubuntu 18.04 repositories is 3.4.4 .

ffmpeg - What is the difference between libx264 and h264 ...


h264_nvenc uses the NVidia hardware assisted H.264 video encoder. libx264 is a software (CPU) based H.264 encoder. I would guess that libx264 delivers better quality than h264_nvenc for the same bitrate. h264_nvenc is probably faster and uses less power. h264_nvenc is only available on NVIDIA hardware.

windows - ffmpeg libx264 AVCodecContext settings - Stack ...


I am using a recent windows (Jan 2011) ffmpeg build and trying to record video in H264. It is recording fine in MPEG4 using the following settings: c->codec_id = CODEC_ID_MPEG4; c->codec_typ...

FFmpeg/LICENSE.md at master · FFmpeg/FFmpeg · GitHub


Dec 28, 2019 · libx264; libx265; libxavs; libxavs2; libxvid; When combining them with FFmpeg, FFmpeg needs to be licensed as GPL as well by passing --enable-gpl to configure. The following libraries are under LGPL version 3: gmp; libaribb24; liblensfun; When combining them with FFmpeg, use the configure option --enable-version3 to upgrade FFmpeg to the LGPL v3.

ffmpeg与x264差异? - 知乎


正确的写法 ffmpeg -i xx.mkv -vcodec libx264 xxx.mp4 我可以马上说出差异。 但是,如果你要深入使用ffmpeg的话,建议去了解这些参数的意义。看官网的文档是个好习惯。-vcodec 参数指定视频的编码器 h264\h263\h265是编码器类型。 为什么要用它呢?

FFmpeg-users - Compiling ffmpeg with libx264


Jan 14, 2016 · Re: Compiling ffmpeg with libx264 On Thu, 14 Jan 2016 07:14:26 -0500 Krishnan Unni < [hidden email] > wrote: > I am able to compile ffmpeg alone successfully. But when I try to > compile x264 lib based on the guide provided in ffmpeg wiki it's > failing saying "could not identify os" If you're having problems compiling x264 you should get help ...

FFmpeg-users - Windows Media Player cannot play the file


Thanks very much to Tom and James. It worked. For completeness of the thread, the following was successful: ffmpeg -y -r 2 -i tst%d.png -b 300k -pix_fmt yuv420p tst.mp4 > As for uploading to youtube, just make the highest quality file. They > will re-encode it anyway. But if you are aiming to produce a file that > will play on any basic Windows installation you will want to read this: > http ...

Cheat sheets and presets-settings that actually work with ...


FFmpeg does not include text file based presets and profiles anymore for libx264, i.e. what you've used with the -vpre option. These have been depreciated and removed in favor of accessing the actual x264 presets, profiles (and tunes) with the -preset, -profile:v, and -tune options. The old text files only emulated the official x264 presets and profiles, and due to several limitations could ...



FFmpeg has added a realtime bright flash removal filter to libavfilter. Note that this filter is not FDA approved, nor are we medical professionals. Nor has this filter been tested with anyone who has photosensitive epilepsy. FFmpeg and its photosensitivity filter are not making any medical claims. That said, this is a new video filter that may ...

auto-select yuv420p for RGB inputs with libx264 - FFmpeg


for followers, you can specify it like "ffmpeg -i input -c:v libx264rgb" (and add normal libx264 args after that). Note: See TracTickets for help on using tickets. Download in other formats:

GitHub - homebrew-ffmpeg/homebrew-ffmpeg: A homebrew tap ...


Mar 30, 2020 · Dependency Description Remarks; chromaprint: Chromaprint audio fingerprinting library: decklink: Enable DeckLink support: The DeckLink SDK has to be installed before running the FFmpeg

Ffmpeg Libx264 Presets

[Arch] ffmpeg with libx260 - YouTube


May 13, 2020 · passed -vcodec libx264 to command $ ffmpeg -video_size 1680x1050 -framerate 25 -f x11grab -i :0 -vcodec libx264 -preset ultrafast Screenrecord/test05.mkv #ffmpeg # ...

Video Encoding with FFMPEG · stoyanovgeorge/ffmpeg Wiki ...


Jul 04, 2018 · You can encode the video lossless using constant rate factor crf = 0 The fastest way to encode it is using the ultrafast preset: ffmpeg -i input -c:v libx264 -preset ultrafast -crf 0 output.mkvand the preset which will provide you with the best compression is using the veryslow preset: ffmpeg -i input -c:v libx264 -preset veryslow -crf 0 output.mkv

CompilationGuide – FFmpeg


Read the Generic compilation guide, regardless of your platform. It provides generic compilation and installation instructions, including the use of configure . Compiling FFmpeg on Ubuntu / Debian / Mint. Compiling FFmpeg on CentOS / RHEL / Fedora. Note: If you are using gcc-4.2, please read ticket 1464 first, and try to update your ...

Ffmpeg Libx264

ffmpeg encoding H.264 - decrease size, maintain quality


ffmpeg -i input -c:v libx264 -preset veryslow -crf 0 output.mkv Note that lossless output files will likely be huge, and most non-FFmpeg based players will not be able to decode lossless, so if compatibility or file size issues you should not use lossless.