Split the bitrate between video and audio, about 3/4 video, 1/4 audio. Calculate your bitrate using bitrate target file size / duration. (My problem with h264 encoding is that I run out of RAM at high resolutions like 8k. Reduce video to pre-determined file size using Windows 10, cmd and ffmpeg. ffmpeg -i input.mkv -c:v libx265 -vtag hvc1 -c:a copy output.mkv. That command was:įfmpeg -loglevel warning -y -f rawvideo -vcodec rawvideo -s 1920x1080 -pix_fmt rgb24 -r 24 -i -an -vf vflip -pix_fmt yuv420p -c:v libx264 -crf 18 -force_key_frames expr:gte(tn_forced/2) -bf 2 out.mp4 The output videos were between 2-8x smaller in size, without any noticeable loss in quality. You can also move the progress bar to automatically change the compression level. To reduce the size of the file, you can change the format, resolution, bit rate, and frame rate of the added video. Step 2 Customize video compression settings. When I use h264 as encoder, I don't get this error. Go to the Video Compressor option, and click on the + sign and the file explorer will open up. (Also, for some weird reason, VLC shows Frame rate: 24.000384 for this mkv file, even though I specified exactly 24.) The reason I'm asking is because ffmpeg is already at high CPU and RAM usage, and if this message means it won't drop frames, I prefer not to raise thread_queue_size, to leave more resources for my parent process (which needs it, because it's generating the frames procedurally).įfmpeg -loglevel warning -y -f rawvideo -vcodec rawvideo -s 1920x1080 -pix_fmt rgb24 -r 24 -i -i -c:a copy -vf vflip -c:v ffv1 -level 3 -threads 8 -coder 1 -context 1 -g 1 -slices 24 -slicecrc 1 out.mkv
Thread message queue blocking consider raising the thread_queue_size option (current value: 8)ĭoes that mean it drops frames when recording the video file to disk? When piping raw frames from my program into a ffmpeg child-process using FFV1 encoder, I get:
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