![]() # To convert a video to compatible HTML5 video format (mp4): ()įfmpeg -i infile.ext -acodec aac -strict experimental -ac 2 -ab 128k -vcodec libx264 -preset slow -f mp4 -crf 22 outfile.mp4įor f in *.m4a do ffmpeg -i " $f " -acodec libmp3lame -ab 320k " $. # To join/concatenate two mp4 videos (use double-quotes in Windows):įfmpeg -i one.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts one.tsįfmpeg -i two.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts two.tsįfmpeg -i "concat:one.ts|two.ts " -c copy -bsf:a aac_adtstoasc combined.mp4 mp4 -codec:video libvpx-vp9 -crf -b:video 0 -codec:audio libopus -vbr on -threads. ![]() For the best quality, use a CRF value (recommended range 15-35) and -b:video MUST be 0:įfmpeg -i. # To remux MKV video to MP4 without re-encoding audio or video streams: First -ss sets the start time for the original file Second -ss sets the start time for the new file -t sets the end time of the new. avi -codec:audio aac -b:audio 128k -codec:video libx264 -crf 23. AAC Audio 128kbit, h264 Video CRF 23:įfmpeg -i. I try to insert key-frame before trimming, but it doesn't work. So I don't have enough control over the ending frame. # To trim a video from a given start time mm:ss to an end time mm2:ss2 (omit the -to flag to trim till the end): 7 I need to trim videos with a precise end frame, however, ffmpeg seems to cut the video at the nearest first key-frame. # To quickly extract a single frame from a video at time mm:ss and save it as a 128x128 resolution image: ![]() # To combine numbered images (frame_1.jpg, frame_2.jpg, etc) into a video or GIF: ![]() # To convert frames from a video or GIF into individual numbered images: # To extract the sound from a video and save it as MP3: ![]()
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