bytedeco/javacv

Error loading local image when adding a watermark using FFmpegFrameFilter.

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#2,289 opened on Oct 8, 2024

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Description

The code is as follows:

    String watermarkImagePath = "E:/watermark/watermark.png";
    String filterStr = String.format("[in]scale=1920:1080[v1];movie=%s[watermark];[v1][watermark]overlay=0:0,format=rgba [out]",watermarkImagePath);
    FFmpegFrameFilter filter = new FFmpegFrameFilter(filterStr, 1920, 1080);
    filter.start();

When I change watermakImagePath to a file under the project, String watermarkImagePath = "watermark.png", the watermark can be generated normally，I use an absolute path,watermarkImagePath = "E:/watermark/watermark.png", it gives an error.

Error: [Parsed_movie_1 @ 0000015468d24940] Failed to avformat_open_input 'E'

Error: [AVFilterGraph @ 0000015468227f40] Error processing filtergraph: No such file or directory

Contributor guide

Research direction
Investigate how the `movie` filter source handles file paths in FFmpegFrameFilter. Look at the source code for how the filter string is constructed and passed to FFmpeg. Check if there is any path normalization or escaping, especially for Windows drive letters. Consider using `file:` protocol or backslash escaping. Also verify if the issue occurs on Linux with absolute paths.
Tech stack
java
Domain
api
Issue type
Bug
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.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaFFmpeg filter graph syntaxWindows file path handlingJavaCV library
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70