Search results
Mar 29, 2016 · @s4y youtube-dl will indeed transcode when it needs to (--audio-format option) but you are right here: it should not be the case with that line, because you are forcing youtube-dl to download two files (bestaudio[ext=mp4] and bestvideo[ext=m4a]) that have the same kind of container in common (mp4), so whatever their content, when remuxing it, they will be stacked in another mp4 without any transcoding required.
Aug 19, 2020 · Youtube's MP4 videos are encoded using the H.264/AVC codec. Youtube's WEBM videos are usually encoded using the VP9 codec which is a much more efficient and newer codec which allows to compress video better (which means a smaller file size) while providing a perceptually better image quality.
ffmpeg -i input.mp4 -b 800k output.mp4 Additional options that might be worth considering is setting the Constant Rate Factor, which lowers the average bit rate, but retains better quality. Vary the CRF between around 18 and 24 — the lower, the higher the bitrate. ffmpeg -i input.mp4 -vcodec libx264 -crf 20 output.mp4
Jul 21, 2019 · I see there are videos on youtube with 1080p resolution that are more than 10 minutes long and only 50-60 mb in size. I have a video only 3 minutes long and only 720p resolution but unable to bring it down below 90mb in size. I checked another answer here on reducing size. Tried changing bitrate using ffmpeg -i input.mp4 -b 1000000 output.mp4
Sep 18, 2015 · # function that uses youtube-dl along with ffmpeg to capture a portion of a yt video # $1 - youtube URL # $2 - start position in hh:mm:ss.msms format (ms=miliseconds) # $3 - final position in hh:mm:ss.msms format (ms=miliseconds) # $4 - output file name (optional) # $5 - output video codec type (optional, for instance: libx264) # $6 - output audio codec type (optional, for instance: aac) function youtubedl_snippet()( local url_streams=$(youtube-dl -f best --get-url $1) local output_name ...
Jul 8, 2021 · ffmpeg -loop 1 -i input.jpg -i input.mp3 -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:-1:-1:color=black,setsar=1,format=yuv420p" -shortest -fflags +shortest output.mp4 This command uses the scale + pad filters to make image fit into 1920x1080, setsar filter to set a normal Sample Aspect Ratio, then the format filter sets the chroma subsampling to YUV 4:2:0 for playback compatibility.
On Mac, I found that this resulted in N output video chunks but only the 1st of them was a valid, viewable MP4. The other N-1 chunks were blank video (all black) with no audio. To make it work, I needed to add the reset_timestamps flag like so: ffmpeg -i input.mp4 -c copy -map 0 -segment_time 8 -f segment -reset_timestamps 1 output%03d.mp4. –
Jan 11, 2019 · Restore a damaged (truncated) mp4, m4v, mov, 3gp video. Provided you have a similar not broken video. you may need to compile it from source, but there is another option to use a Docker container and bind the folder with the file into the container and fix it that way.
Sep 20, 2015 · avconv -i input.mp4 -c:v libx265 -x265-params crf=23 -c:a copy output.mp4 However, the problem is that for some videos CRF value of 28 is good enough, while for some videos, lower CRF is required. This is something which I have to check manually by converting small sections of the big videos.
Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
