bytedeco/javacv

FFMpeg How to seek large file (HTTP source)?

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#1,803 opened on Apr 16, 2022

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Description

I have a large file published by lighttd server and custom inputstream for buffer it and use it. Then i call the setTimestamp(ts) i got a downloading file until necessery ts position. Its a very long time. For fix it i tried call avformat_seek_file(oc, -1, offset, offset, offset, AVSEEK_FLAG_BYTE) and have partial success. but timestamp reseted and begin from zero. Also i look messages in std output

[mp3float @ 0x7f75041dc6c0] Could not update timestamps for skipped samples.
[mp3float @ 0x7f75041dc6c0] Header missing
[mp3float @ 0x7f75041dc6c0] Could not update timestamps for skipped samples.

How to seek in large files with saving ts? May i have a seek by bytes have fix missing headers?

Contributor guide

Research direction
Investigate the avformat seek file call and timestamp handling in JavaCV's FFmpeg binding. Focus on how seeking by byte offset affects timestamp continuity and how to properly reset or preserve timestamps.
Tech stack
java
Domain
backend
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.
1-2 days
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
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35