[SOLVED] Please help to find a way to open or convert AVI(X265) video from IP camera

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[SOLVED] Please help to find a way to open or convert AVI(X265) video from IP camera Empty [SOLVED] Please help to find a way to open or convert AVI(X265) video from IP camera

Post by farms Sun Dec 18, 2022 6:20 pm

Hi, i'm having problems opening or converting the videos from my ip camera's SD card. Videos itself are playable through V380 Pro mobile app.
Audio plays.

Tried: LAV (from K-Lite Codec Pack), ffmpeg, x265vfw - those failed

Sample AVI file: https://drive.google.com/file/d/1ocVHhhvXuosijYf8xVJ2M3E8xXI6otY0/view?usp=share_link

Please advice.


Last edited by farms on Mon Dec 19, 2022 9:03 am; edited 1 time in total

farms

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Join date : 2022-12-18

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Post by Admin Sun Dec 18, 2022 8:28 pm

Open the file with a HexEditor.
In the beginning of the file, replace x265 with hvc1.
Then you should be able to play it.

To get proper support for such files in all apps, I suggest submitting it to FFmpeg bug tracker:
http://trac.ffmpeg.org/query?status=new&status=open&status=reopened&col=id&col=summary&col=status&col=type&col=component&col=version&col=time&col=changetime&report=1&desc=1&order=changetime

Mention that changing the FourCC makes it playable. They can add support for it.

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Post by farms Mon Dec 19, 2022 7:00 am

Thank you, absolutely perfect answer. Now i'll be able to process all the files with some script

Upd. My script for node.js in case someone else will be looking for a solution
Code:
const fs = require('fs').promises;

const root = 'g:/NAS/Camera/'
const dest = 'g:/NAS/CameraFixed/'

const stats = {
 found: 0,
 fixed: 0,
}

async function readFile(filePath) {
   try {
     return await fs.readFile(filePath);
   } catch (error) {
     //
   }
}

async function writeFile(filePath, buffer)
{
 try {
 return await fs.writeFile(filePath, buffer);
 } catch (error) {
 //
 }
}

async function makeDirTree(path)
{
 await fs.mkdir(path, { recursive: true });
}

const getContents = async source => {
 let files = [];
 let folders = [];
 (await fs.readdir(source, { withFileTypes: true }))
    .map(dirent => {
     if (dirent.isDirectory() && dirent.name.indexOf('.') != 0)
     {
     folders.push(dirent.name)
     } else
     if (dirent.name.endsWith('.avi'))
     {
     files.push(dirent.name)
     }
    })
    return {files, folders}
}
  
const crawl = async (source) => {
 let found = await getContents(source)
 for (let file of found.files)
 {
 stats.found ++
 console.log(source + file)

 const strs = 'x265'
 let binary = await readFile(source + file)

 if (binary[196] == strs.charCodeAt(0) && binary[197] == strs.charCodeAt(1) && binary[198] == strs.charCodeAt(2) && binary[199] == strs.charCodeAt(3))
 {
 const str = 'hvc1'

 binary[196] = str.charCodeAt(0)
 binary[197] = str.charCodeAt(1)
 binary[198] = str.charCodeAt(2)
 binary[199] = str.charCodeAt(3)

 let destination = dest + source.replace(root, '')

 await makeDirTree(destination)
 await writeFile(destination + file, binary)

 stats.fixed ++
 }
 }
 for (let folder of found.folders)
 {
 await crawl(source + folder + '/')
 }
}

const work = async () => {
 await crawl(root)

 console.log(stats)
}

work()

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Post by Admin Mon Dec 19, 2022 11:43 am

Just a note for anyone else that might be tempted to use that script. The position of the FourCC is hardcoded. It might be at a different binary position in other file sets. So don't forget to verify the binary offset. Or adjust the script to search for the first occurrence in the first couple hundred bytes.

The header of this file seems to be a bit messed up in general. So that is why FourCC changing tools might fail. And tools like MediaInfo show incorrect height.

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