Warm tip: This article is reproduced from serverfault.com, please click
camera ffmpeg raspberry-pi

Extracting frames from video while recording using ffmpeg

发布于 2020-12-01 10:08:45

I am using ffmpeg to record a video using a Raspberry Pi with its camera module. I would like to run a image classifier on a regular interval for which I need to extract a frame from the stream.

This is the command I currently use for recording:

$ ffmpeg -f video4linux2 -input_format h264 -video_size 1280x720 -framerate 30 -i /dev/video0 -vcodec copy -an test.h264

In other threads this command is recommended:

ffmpeg -i file.mpg -r 1/1 $filename%03d.bmp

I don't think this is intended to be used with files that are still appended to and I get the error "Cannot use -sseof, duration of test.h264 not known".

Is there any way that ffmpeg allows this?

Questioner
nilolo
Viewed
0
分享
Mark Setchell 2020-12-01 19:34:13

I don't have a Raspberry Pi set up with a camera at the moment to test with, but you should be able to simply append a second output stream to your original command, as follows to get, say, 1 frame/second of BMP images:

ffmpeg -f video4linux2 -input_format h264 -video_size 1280x720 -framerate 30 -i /dev/video0 -vcodec copy -an test.h264 -r 1 frame-%03d.bmp
nilolo 2020-12-02 12:18:18

Thank you very much! This is a perfect solution for my needs.

Mark Setchell 2020-12-02 12:26:44

Cool - good luck with your project!

热门帖子

1
川西之旅，照片分享
2
榨汁机和榨汁杯有什么推荐吗？有在使用和用过的朋友推荐一下，非常感谢。
3
大陆人工资存香港银行？
4
人活一世，真累
5
网页单词标记插件-Neonlingo (更新啦)「期待大家的建议，送微信红包封面皮肤！」
6
Mac 系统求推荐个支持可填写 key 的 tts 文本转语音软件
7
买了 Apple Vision Pro 的朋友，目前使用状况如何？
8
嘴巴里或者脑袋里最近哼着什么歌？
9
寻找 ios 端支持微软 tts 的听书软件，希望支持云泽的声音
10
颠覆 Google/百度的下一代搜索产品是什么？据说下一代 AI 搜索工具 Thinkany 的 Demo 只花了 3 天时间！

热门github

1
Implementation of paper - YOLOv9: Learning What You Want to Learn Using Programmable Gradient Information
2
A Windows and Office activator using HWID / Ohook / KMS38 / Online KMS activation methods, with a focus on open-source code and fewer antivirus detections.
3
Get up and running with Llama 2, Mistral, Gemma, and other large language models.
4
该项目可以让你通过订阅的方式使用Cloudflare WARP+，自动获取流量。This project enables you to use Cloudflare WARP+ through subscription, automatically acquiring traffic.
5
Multi functional app to find duplicates, empty folders, similar images etc.
6
Xray panel supporting multi-protocol multi-user expire day & traffic & ip limit (Vmess & Vless & Trojan & ShadowSocks & Wireguard)
7
The Free Software Media System
8
lightweight, standalone C++ inference engine for Google's Gemma models.
9
📚 Freely available programming books
10
A collective list of free APIs
11
1️⃣🐝🏎️ The One Billion Row Challenge -- A fun exploration of how quickly 1B rows from a text file can be aggregated with Java
12
🎓 Path to a free self-taught education in Computer Science!
13
Curso para aprender el lenguaje de programación Python desde cero y para principiantes. 75 clases, 37 horas en vídeo, código, proyectos y grupo de chat. Fundamentos, frontend, backend, testing, IA...
14
This repository contains System Design resources which are useful while preparing for interviews and learning Distributed Systems
15
Mamba is a new state space model architecture showing promising performance on information-dense data such as language modeling, where previous subquadratic models fall short of Transformers. It is based on the line of progress on structured state space models, with an efficient hardware-aware design and implementation in the spirit of FlashAttention.