How to speed up / slow down a video – FFmpeg
Speeding up/slowing down video The speed of a video stream can be changed by changing the presentation timestamp (PTS) of each video frame. This can be done via two methods: using the setpts video filter (which requires re-encoding) or by erasing the timestamps by exporting the video to a raw bitstream format and muxing to a container while creating new timestamps. Note that in the following exam
Encode/AV1 – FFmpeg
AV1 is an open source & royalty-free video codec developed by the Alliance for Open Media (AOMedia), a non-profit industry consortium. Depending on the use case, AV1 can achieve about 30% higher compression efficiency than VP9, and about 50% higher efficiency than H.264. There are currently three AV1 encoders supported by FFmpeg: libaom (invoked with libaom-av1 in FFmpeg), SVT-AV1 (libsvtav1), a
HWAccelIntro – FFmpeg
Many platforms offer access to dedicated hardware to perform a range of video-related tasks. Using such hardware allows some operations like decoding, encoding or filtering to be completed faster or using less of other resources (particularly CPU), but may give different or inferior results, or impose additional restrictions which are not present when using software only. On PC-like platforms, vid
CompilationGuide/MSVC – FFmpeg
FFmpeg can be built on Windows with Visual Studio. The official guide is quite clear, but a little bit out-of-date. FFmpeg can be built with MSVC 2012 or earlier using a C99-to-C89 conversion utility and wrapper, or with MSVC 2013 or later natively. You will need the following prerequisites: C99-to-C89 Converter & Wrapper if using MSVC 2012 or earlier. msinttypes if using MSVC 2012 or earlier.
Concatenate – FFmpeg
If you have media files with exactly the same codec and codec parameters you can concatenate them as described in "Concatenation of files with same codecs". If you have media with different codecs you can concatenate them as described in "Concatenation of files with different codecs" below. Concatenation of files with same codecs There are two methods within ffmpeg that can be used to concatenate
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