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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
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Submit bugs and patches
13 avril 2011Unfortunately a software is never perfect.
If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
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Sur d’autres sites (3769)
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Latest FFmpeg fails to create a good MP4 out of JPG file (Windows 10)
30 décembre 2023, par mengrieI am using FFmpeg to create an MP4 file out of several JPG files. The command to accomplish this


ffmpeg.exe ^
-hide_banner -nostats -loglevel error -y ^
-loop 1 -t 6 -i 001.jpg ^
-loop 1 -t 6 -i 002.jpg ^
-loop 1 -t 6 -i 003.jpg ^
-loop 1 -t 6 -i 004.jpg ^
-loop 1 -t 6 -i 005.jpg ^
-loop 1 -t 6 -i 006.jpg ^
-filter_complex ^
"[0:v]scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1,fade=t=out:st=5:d=1[v0]; ^
[1:v]scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1,fade=t=in:st=0:d=1,fade=t=out:st=5:d=1[v1]; ^
[2:v]scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1,fade=t=in:st=0:d=1,fade=t=out:st=5:d=1[v2]; ^
[3:v]scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1,fade=t=in:st=0:d=1,fade=t=out:st=5:d=1[v3]; ^
[4:v]scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1,fade=t=in:st=0:d=1,fade=t=out:st=5:d=1[v4]; ^
[5:v]scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1,fade=t=in:st=0:d=1,fade=t=out:st=5:d=1[v5]; ^
[v0][v1][v2][v3][v4][v5]concat=n=6:v=1:a=0,format=yuv420p[v]" -map "[v]" -r 30 006.mp4


Using "ffmpeg version 2022-12-25-git-eeb280f351-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers built with gcc 12.1.0 (Rev2, Built by MSYS2 project)" does the job as expected.


However, yesterdag I downloaded (from gyan.dev - Windows - ffmpeg-git-full.7z) the latest version and upgrade the tool. "ffmpeg version 2023-12-28-git-c1340f3439-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers built with gcc 12.2.0 (Rev10, Built by MSYS2 project)"


Using this version, the MP4 contains only a few JPGs and timing is also messed up, resulting in a useless MP4.


Has something changed or are these parameters causing a new behaviour ?


Thx


In meanwhile I went back to older version


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FFmpeg batchfile to compress images JPG JPEGs and keep EXIF (metadata)
24 novembre 2023, par esdoublelefI tried searching everywhere for a possible solution but I really can't find it. Hope someone can help me out here.


I have written a batch file to use FFmpeg to compress and sharpen JPGs in a folder.


@ECHO ON
 FOR %%a in (*.jpg) DO (ffmpeg -i "%%a" -q:v 8 -vf unsharp=5:5:1.0:5:5:0.0 "2022 01 22 %%~na".jpg)
PAUSE


The new file comes out smaller in size, but is missing all the EXIF information that the original photo has.


I tried to add in the command
-metadatabut apparently it works for MP4 only. I have an existing solution with ImageMagick but I'm hoping to solve this via FFmpeg.

Or is there a way to integrate exiftool into the batch file ?


Thank you and I really appreciate any help here.


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memcpy to av_malloc's memory crash
26 octobre 2023, par PeacefulWindyI use the code in x64 windows :


#include<iostream>
#include<memory>
#include<vector>
extern "C"
{
#include <libavcodec></libavcodec>avcodec.h>
#include<libavformat></libavformat>avformat.h>
#include <libavutil></libavutil>imgutils.h>
#include<libswscale></libswscale>swscale.h>
#include<libswresample></libswresample>swresample.h>
}

struct BufferData
{
 uint8_t* ptr;
 size_t size;
 size_t file_size;
};

int main()
{
 auto file=fopen("E:/test.jpg", "rb");
 fseek(file, 0, SEEK_END);
 auto fileSize = ftell(file);
 fseek(file, 0, SEEK_SET);
 auto data = std::vector(fileSize);
 fread(data.data(), sizeof(uint8_t), fileSize, file);
 fclose(file);

 auto test = BufferData();
 test.ptr = data.data();
 test.size = data.size();
 test.file_size = data.size();
 auto buffer = (uint8_t*)av_malloc(4096 * 10);
 char errStr[128] = { 0 };

 auto avformatContext = avformat_alloc_context();
 auto avioContext = avio_alloc_context(buffer, 4096, 0, &test, [](void* opaque, uint8_t* buf, int buf_size)
 {
 BufferData* bd = (BufferData*)opaque;
 auto size = std::min(bd->size, (size_t)buf_size);

 if (!size)
 {
 return -1;
 }

 memcpy(buf, bd->ptr, size);
 bd->ptr += size;
 bd->size -= size;
 return (int)size;
 }, NULL, NULL);
 avformatContext->pb = avioContext;
 avformatContext->flags = AVFMT_FLAG_CUSTOM_IO;

 auto ret = avformat_open_input(&avformatContext, nullptr, nullptr, nullptr);
 if (ret != 0)
 {
 av_strerror(ret, errStr, sizeof(errStr));
 std::cout << errStr << std::endl;
 av_free(buffer);
 avformat_close_input(&avformatContext);
 return 0;
 }

 ret = avformat_find_stream_info(avformatContext, nullptr);
 if (ret < 0)
 {
 av_strerror(ret, errStr, sizeof(errStr));
 std::cout << errStr << std::endl;
 av_free(buffer);
 avformat_close_input(&avformatContext);
 return 0;
 }

 av_dump_format(avformatContext, 0, nullptr, 0);

 auto videoIndex = av_find_best_stream(avformatContext, AVMEDIA_TYPE_VIDEO, -1, -1, nullptr, 0);
 if (videoIndex == AVERROR_STREAM_NOT_FOUND)
 {
 av_free(buffer);
 avformat_close_input(&avformatContext);
 return 0;
 }
 else if (videoIndex == AVERROR_DECODER_NOT_FOUND)
 {
 av_free(buffer);
 avformat_close_input(&avformatContext);
 return 0;
 }

 auto videoCodecPar = avformatContext->streams[videoIndex]->codecpar;
 auto videoCodec = avcodec_find_decoder(videoCodecPar->codec_id);
 if (!videoCodec)
 {
 av_free(buffer);
 avformat_close_input(&avformatContext);
 return 0;
 }

 av_free(buffer);
 avformat_close_input(&avformatContext);
}
</vector></memory></iostream>

I use memcpy to copy data to buffer,it run to av_free(buffer) get crash.
ffmpeg version is 6.0.
Visual Studio version is 2022 with CMake.


Use fread replace memcpy,it can work !But I need to resolve load from std::vector memory,not fread.
I think maybe memory-align problem when run av_free,but I no way to find the cause.


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