How to create a fade in fade out effect on a video

从 OPT_INPUT 与 OPT_OUTPUT 两个属性可以知道， pix_fmt 参数可以作用于输入文件，也可以作用于输出文件。 pix_fmt 参数作用于输入文件.

3. `-pix_fmt yuv420p`: 设置像素格式为YUV420P，这是H264编码器支持的常见格式。 4. `-c:v libx264`: 选择H264编码器，`libx264`是FFmpeg中的x264编码库，它 ...

Use the -pix_fmt option in FFmpeg to specify the desired pixel format during transcoding, which will allow you to change the video's pixel format.

ffmpeg is a universal media converter. It can read a wide variety of inputs - including live grabbing/recording devices - filter, and transcode them into a ... Description · Detailed description · Stream selection

pix_fmt 参数作用于输出源 · 1，把 pix_fmt 参数的值赋值到 OptionsContext 结构的 frame_pix_fmts 字段，常规操作 · 2，把 frame_pix_fmts 赋值给编码器参数 ...

Use the format filter or the -pix_fmt option. For example we'll use yuv420p pixel format! # Using the format filter (yuv420p) ffmpeg -i ...

1024 bytes long (256 4-byte entries) and is formatted the same as in PIX_FMT_RGB32 described above (ie, it is also endian-specific).

-pix_fmt <pixel format> is a legacy option: You can use the format filter, or the legacy -pix_fmt option, to set the pixel format.

这里，还有一个重点，如果解码器输出的pix_fmt 跟video_enc->pix_fmt 不一致，就会创建filter，进行格式转换。把像素格式转换好之后再丢给编码器。