ffmpeg -f concat -safe 0 -i mp4_files -vf scale=640:480 -c:a aac -b:a 128k output.mp4 这样原来的4个文件大致60G，被合并且压缩成了368M的文件。（当然压缩的比率和你源文件本身的清晰度是相关的）。更多的操作，你可以参考下面链接或者官方文档：https://ottverse.com/change-resolution-resize-...
Changing the resolution of a video file will be one of the most common operations that we will perform when working with video files, and as such ffmpeg is able to do it perfectly. There are several reasons why we should want to change the resolution of a video file, for example:To ...
How do you Resize/Scale/Change the Resolution of a Video using FFmpeg? Using FFmpeg to scale or change the resolution of a video is done by thescalefilter in FFmpeg. To use thescalefilter, use the following command – ffmpeg -i input.mp4 -vf scale=$w:$h <encoding-parameters> output.m...
If you want to reverse from H.265 to H.264, just change the encoder tolibx264. Transmuxing Transmuxing means transfer video files from one container to another. Notice that transfering container does not change encoding, so it's pretty fast. Here is an example from.mp4to.webm ffmpeg -i ...
Please note that this is a different thing than specifying-1for@option{w}or@option{h}, you still needtospecify the output resolutionforthis optiontowork. 大致意思就是由于我们事先不知道设备支持的最大分辨率,使用此参数可以支持缩小视频以适配系统设备分辨率。
{ this.durationStr = info.durationStr this.duration = info.duration this.bitRate = info.bitRate this.majorBrand = info.majorBrand this.encoder = info.encoder this.resolution = info.resolution this.fps = info.fps this.videoInfo = info.videoInfo this.audioType = info.audioType this.audioRate...
Now let's code an example using libav to provide the same effect as in ffmpeg input.mp4 -c copy output.ts.We're going to read from an input (input_format_context) and change it to another output (output_format_context).AVFormatContext *input_format_context = NULL; AVFormatContext *output...
(avctx->scenechange_threshold >= 0) x4->params.i_scenecut_threshold = avctx->scenechange_threshold; if (avctx->qmin >= 0) x4->params.rc.i_qp_min = avctx->qmin; if (avctx->qmax >= 0) x4->params.rc.i_qp_max = avctx->qmax; if (avctx->max_qdiff >= 0) x4->params...
一、前言 FFmpeg的Static版本的bin文件夹中只有三个.exe文件,分别是: ffmpeg.exe、ffplay.exe、ffprobe.exe,这三个是FFmpeg源代码编译后生成的可执行文件,也就是FFmpeg的三大工具,本文章主要介绍ffmpeg。 ffm…
Consider all input videos already have the same resolution and duration. ("xstack" filter has been added in the 4.1 version of the ffmpeg).$inputs = array( 'video_1.mp4', 'video_2.mp4', 'video_3.mp4', 'video_4.mp4', ); $advancedMedia = $ffmpeg->openAdvanced($inputs); $...