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# ffmpeg
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> Video conversion tool.
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- Extract the sound from a video and save it as MP3:
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`ffmpeg -i {{video.mp4}} -vn -codec:audio {{sound}}.mp3`
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- Convert frames from a video or GIF into individual numbered images:
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`ffmpeg -i {{video.mpg|video.gif}} {{frame_%d.png}}`
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- Combine numbered images (frame_1.jpg, frame_2.jpg, etc) into a video or GIF:
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`ffmpeg -i {{frame_%d.jpg}} -f image2 {{video.mpg|video.gif}}`
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- Quickly extract a single frame from a video at time mm:ss and save it as a 128x128 resolution image:
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`ffmpeg -ss {{mm:ss}} -i {{video.mp4}} -frames 1 -s {{128x128}} -f image2 {{image.png}}`
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- Convert AVI video to MP4. AAC Audio @ 128kbit, h264 Video @ 1250kbit (Gives a predictable file size at lower quality):
`ffmpeg -i {{input_video}}.avi -codec:audio aac -b:audio 128k -codec:video libx264 -b:video 1250K {{output_video}}.mp4`
- Convert AVI video to MP4. AAC Audio @ 128kbit, h264 Video @ CRF 23, Preset of very slow (Good trade off with file size/speed/quality), also allow faststart by moving the MOOV atom to the start of the file after processing:
`ffmpeg -i {{input_video}}.avi -codec:audio aac -b:audio 128k -codec:video libx264 -crf 23 --preset veryslow --movflags +faststart {{output_video}}.mp4`
- Remux MKV video to MP4. No re-encoding of video or audio streams, convert subtitles stream to MP4 compatible codec:
`ffmpeg -i {{inpupt_video}}.mkv -codec:audio copy -codec:video copy -codec:s mov_text --movflags +faststart {{output_video}}.mp4`
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