ffmpeg-libav-tutorial | FFmpeg libav tutorial - learn how media works | Video Utils library

by leandromoreira C Version: 1.0.0 License: BSD-3-Clause

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kandi X-RAY | ffmpeg-libav-tutorial Summary

ffmpeg-libav-tutorial is a C library typically used in Video, Video Utils applications. ffmpeg-libav-tutorial has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

I was looking for a tutorial/book that would teach me how to start to use FFmpeg as a library (a.k.a. libav) and then I found the "How to write a video player in less than 1k lines" tutorial. Unfortunately it was deprecated, so I decided to write this one. Most of the code in here will be in C but don't worry: you can easily understand and apply it to your preferred language. FFmpeg libav has lots of bindings for many languages like python, go and even if your language doesn't have it, you can still support it through the ffi (here's an example with Lua). We'll start with a quick lesson about what is video, audio, codec and container and then we'll go to a crash course on how to use FFmpeg command line and finally we'll write code, feel free to skip directly to the section Learn FFmpeg libav the Hard Way. Some people used to say that the Internet video streaming is the future of the traditional TV, in any case, the FFmpeg is something that is worth studying.

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ffmpeg-libav-tutorial has a medium active ecosystem.

It has 8808 star(s) with 864 fork(s). There are 266 watchers for this library.

It had no major release in the last 12 months.

There are 31 open issues and 46 have been closed. On average issues are closed in 33 days. There are 3 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of ffmpeg-libav-tutorial is 1.0.0

Quality

ffmpeg-libav-tutorial has 0 bugs and 0 code smells.

Security

ffmpeg-libav-tutorial has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

ffmpeg-libav-tutorial code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

ffmpeg-libav-tutorial is licensed under the BSD-3-Clause License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

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Installation instructions are not available. Examples and code snippets are available.

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Community Discussions

Trending Discussions on ffmpeg-libav-tutorial

libav producing MP4 file with extremely high frame rate

FFMPEG convert YCbCr to RGB using sws_scale

Using explicit casting to solve invalid conversion from ‘int’ to ‘AVRounding’

QUESTION

libav producing MP4 file with extremely high frame rate

Asked 2021-Dec-03 at 08:11

I am trying to write a program to generate frames to be encoded via ffmpeg/libav into an mp4 file with a single h264 stream. I found these two examples and am sort of trying to merge them together to make what I want: [video transcoder] [raw MPEG1 encoder]

I have been able to get video output (green circle changing size), but no matter how I set the PTS values of the frames or what time_base I specify in the AVCodecContext or AVStream, I'm getting frame rates of about 7000-15000 instead of 60, resulting in a video file that lasts 70ms instead of 1000 frames / 60 fps = 166 seconds. Every time I change some of my code, the frame rate changes a little bit, almost as if it's reading from uninitialized memory. Other references to an issue like this on StackOverflow seem to be related to incorrectly set PTS values; however, I've tried printing out all the PTS, DTS, and time base values I can find and they all seem normal. Here's my proof-of-concept code (with the error catching stuff around the libav calls removed for clarity):

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ANSWER

Answered 2021-Nov-22 at 22:52

You are getting high frame rate because you have failed to set packet duration.

Set the time_base to higher resolution (like 1/60000) as described here:

Source https://stackoverflow.com/questions/70060148

QUESTION

FFMPEG convert YCbCr to RGB using sws_scale

Asked 2021-Oct-07 at 21:38

I am learning how to use FFMPEG from this tutorial. I am trying to work with RGB images instead of greyscale images. I know I have to call sws_scale but I do not know how to call it correctly inside of my decode function. When I run my code, I get the error "[swscaler @ 0x55a8e7dcbdc0] bad dst image pointers.How should I pass my frame to sws_scale so that it works? "

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ANSWER

Answered 2021-Oct-07 at 21:38

I am not sure if using AVFrame for storing the output is the best practice.
In case we are using AVFrame, we have to initialize at least some of the fields.

We may base the solution on the following post, but few of the used functions are deprecated.
Assume we are using a newer version of FFmpeg libraries.

We may use the following allocation stages after AVFrame *pFrameRGB = av_frame_alloc();:

Get buffer sized (allocated number of bytes) for storing the output frame:

Source https://stackoverflow.com/questions/69442603

QUESTION

Using explicit casting to solve invalid conversion from ‘int’ to ‘AVRounding’

Asked 2020-Jul-29 at 19:28

I'm trying to follow the "learn ffmpeg the hard way" guide on github (https://github.com/leandromoreira/ffmpeg-libav-tutorial#chapter-2---remuxing) and when I try to run the remuxing code for myself using a C++ compiler I always get the error

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ANSWER

Answered 2020-Jul-29 at 19:28

AVRounding is indeed an enum (to be exact, an unscoped enum without a fixed underlying type):

Source https://stackoverflow.com/questions/63160647

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