>try a larger value for -crf
OK. The initial value was crf 18 and I now used crf=27 with a better result. I also took my original video, uploaded and downloaded it to youtube to see what youtube accomplishes, and here are the results: Original file: 18MB CRF=18: 25 MB CRF=27: 11.5 MB Youtube: 8.6MB I extracted stream info with ffprobe and here are some values. I'm not sure if these ones are the relevant ones; if more are required please let me know: ORIGINAL: r_frame_rate=60/1 avg_frame_rate=56724480/945439 ~ 60/1 bit_rate=2376739 nb_frames=3693 ------------------ COMPRESSED CRF 18 r_frame_rate=60/1 avg_frame_rate=60/1 bit_rate=3233826 nb_frames=3694 ------------------ COMPRESSED CRF 27 r_frame_rate=60/1 avg_frame_rate=60/1 bit_rate=1408499 nb_frames=3694 ------------------- Youtube: r_frame_rate=30/1 avg_frame_rate=30/1 bit_rate=1011745 nb_frames=1847 ------------------------------ What seems significant to me here is that YouTube reduced the frame rate and consequently the number of frames to half. The quality of the video still seems reasonably to what I need it for, so is there a command in ffmpeg where I can reduce the frame rate and accomplish the same as YouTube? Thanks -----Original Message----- From: ffmpeg-user <[email protected]> On Behalf Of Michael Koch Sent: Friday, June 25, 2021 10:07 PM To: [email protected] Subject: Re: [FFmpeg-user] Compressed file is larger than original... Am 25.06.2021 um 20:40 schrieb [email protected]: > I'm trying to reduce the size of an mp4 file to adjust it for > streaming. The video is about one minute long and I used the sample > command shown in https://trac.ffmpeg.org/wiki/Encode/YouTube. > > > > The original file size is ~18MB while the compressed file ended up at 25MB. > While would the compressed file be larger? > > > > Below is the ffmpeg output: > > > > ffmpeg -i HBR_TT747.mp4 -c:v libx264 -preset slow -crf 18 -c:a copy > -pix_fmt yuv420p HBR_TT747_Compressed.mp4 try a larger value for -crf Michael _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
