bytedeco/javacv

Automatic conversion to supported format in FFmpegFrameRecorder?

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#1,183 opened on Apr 10, 2019

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enhancementhelp wanted

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Description

I have video frames in a specific format, which is not always supported by an encoder. Is there a way to instruct FFmpegFrameRecorder to convert the data from my (known) format to one of the desired formats before encoding? Or maybe a sub-automatic way? I tried going through supported formats for an encoder, like so:

avcodec.AVCodec enc = avcodec_find_encoder_by_name(encoder);
IntPointer formats = enc.pix_fmts();
// going through formats using get() and storing a format inside selectedFormat

and setting one of those in recorder, like so:

recorder.setPixelFormat(selectedFormat);

and recording frame like so:

recorder.record(frame, PIXEL_FORMAT); // pixel format is the format of frame

It doesn't work, obviously. Am I doing it wrong?

Contributor guide

Research direction
Investigate FFmpegFrameRecorder's setPixelFormat and record methods. Use FFmpegFrameFilter to convert pixel formats before recording. Consider using a filter graph to convert frame format to encoder's supported format.
Tech stack
java
Domain
backend
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
JavaFFmpeg basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65