bytedeco/javacv

Lossless conversion from an image to a video

Open

#2322 opened on Mar 8, 2025

View on GitHub
 (13 comments) (0 reactions) (0 assignees)Java (6,985 stars) (1,583 forks)batch import
help wantedquestion

Description

I'm trying to convert an image to a video using the following settings:

  recorder.videoCodec = avcodec.AV_CODEC_ID_FFV1
  recorder.pixelFormat = AV_PIX_FMT_RGB24;
  recorder.videoCodecName = "libx264rgb";
  recorder.videoQuality = 0.0;
  recorder.format = "avi"
  recorder.frameRate = 1.0
  recorder.videoBitrate = 2000000

The result came out is blurry and have different colours compare to the original image. The original image is a JPEG with RGB colour format, its size is about 67KB. May anyone suggest why this is the case? Thanks in advance

Contributor guide

Tech stack
java
Domain
backenddata
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
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 basicsvideo encoding
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the interaction between pixel format RGB24 and the chosen codecs (FFV1, libx264rgb). Check the FFmpeg documentation for color space conversion and the default settings in JavaCV's recorder. Compare the output video frame to the original image to identify color shifts and blurring. Look at the JavaCV issue comments for suggested fixes or workarounds.