This is something I have only witnessed with ffmpeg after transcoding. Could anyone modify my code to provide better encoding at the beginning of the file?įor reference, the original 10mbps mp4s are encoded by Premiere 5.0 and do not have blockiness at the beginning. How can I tell ffmpeg to pay more attention to the beginning of the video? Do I have to resort to 2-pass encoding? I don't want to nearly double the render time because only the first few seconds of the video have this problem. Slowing down the rendering time by changing the preset to "veryslow" only marginally improves the first few seconds, but it increases render time dramatically. Then, after about 3-5 seconds, the stream "corrects" itself and the video is crisp and clear. The above command took about 30 min to complete on a 2017 Macbookpro with 16G of RAM. The problem is that in the first few seconds of the video, the stream is very blocky. ffmpeg -i -vcodec libx264 -profile:v main -level 3.1 -preset slower -crf 18 -x264-params ref4 -acodec copy -movflags +faststart to convert some dashcam footage for viewing on an iOS device.These settings work wonderful and after lots of tweaking to get this code, it produces crisp, clear video for high action, stills, many different colors, etc. This command sets the constant rate factor and also lowers the overall bitrate. Hereâs what I use: ffmpeg -i input.mp4 -vcodec libx265 -crf 20 output.mp4. All you need to do is cd into the directory that contains the video, then run the command you need to compress. Enjoy your stay, and don't hesitate to drop me a comment or a personal message to my inbox. Hereâs the fun part: seeing the real magic of ffmpeg. profile:v main -preset slow -b:v 400k -r 30 -c:a libvo_aacenc -b:a 128k -s 1280x720 -movflags faststart -f mp4 "test-done.mp4" The unsung hero of video encoding - FFMPEG. Be sure to alter the command so that reflects the folder path from your root to. Overlay="(main_w)-(overlay_w):(main_h)-(overlay_h)" -c:v libx264 Unpack the zip in the folder of your choice and open a command prompt with administrators rights. I am using the following code to transcode a 10mbps high quality 1280x720 H264 mp4 into a lower quality H264 mp4 with our logo watermarked on the video.įfmpeg.exe -i test.mp4 -i watermark.png -filter_complex
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |