![]() ![]() ![]() Unless you specify an external decoder (for example, using an AviSynth script) you will be using ffmpeg's internal h.264 decoder. YUY2 Lossless Codec decoder VideoToolbox H.264 encoder We strongly recommend users, distributors, and system integrators to upgrade unless they use current git master. So any time you re-compress a video with ffmpeg you are decompressing the video first. encode faster but produce larger file (use. Re-encoding a video always involves first decoding (decompressing) the video to uncompressed frames, then encoding (compressing) those uncompressed frames with the new codec/settings. select video codec, h264 lib in this case -preset ultrafast. That can vary from something that's visually nearly indistinguishable from the original to something that looks almost nothing like the original. How closely it matches depends on how much the video was compressed and what settings were used. Once you have encoded something to h.264 specs you can never get back the original video from that encoded file, only some that looks like it. libopenh264 Cisco libopenh264 H.264/MPEG-4 AVC encoder wrapper. That is, x264 is an encoder that produces h.264 video. An FFmpeg native decoder for AMR-NB exists, so users can decode AMR-NB. h264 file really ought to contain only video with no audio or other information. x264 is a particular encoder that conforms to that spec. H.264 and AVC are the names of the specification for encoding. The output of ffmpeg -codecs shows: DEV.LS h264 H. 2010 May 25 x264 won MSU Sixth MPEG-4 AVC/H.264 Video Codecs Comparison, with 24 better encoding than second place. ![]()
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