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• How to scale watermark based on video resolution in android using FFmpeg command ?

  16 février 2023, par Ravi Sorathiya

  I want to scale the watermark size based on the given video resolution. but this cmd scales the watermark without respect to the original video.

  


  I want to scale the watermark based on the resolution of the video. if
the video is in high resolution then the watermark will adjust that accordingly. visa versa in lower resolution it will scale accordingly.

  


  please suggest me FFmpeg cmd the dynamically cmd that helps to scale the watermark based on video's resolution

  


  val cmd = arrayOf(
            "-y",
            "-i",
            sourcePath,
            "-i",
            watermarkImagePath,
            "-filter_complex",
            "[1][0]scale2ref=w=oh*mdar:h=ih*0.06[logo][video];[video][logo]overlay=${position}",
            "-map",
            "0:a",
            "-c:v",
            "libx264",
            "-crf",
            "$bitrate",
            "-preset",
            "ultrafast",
            outputLocation.path
        )


  


• ffmpeg scaled output resolution is off by 1px for non-standard inputs [duplicate]

  14 janvier 2023, par GROVER.

  I'm using the ffmpeg CLI to scale user-submitted videos :

  


  ffmpeg -i path/to/file -vf scale=1920:-2 -c:v libx264 -r 30 output.mp4


  


  The scaling works fine with standard video sizes, such as 1920×1080 and 720×480. However, once we start using videos that do not have conventional resolutions, the output begins to scale incorrectly.

  


  For example, a video that has a resolution of 3360×1882 will output to 1921×1076, when the expected resolution should theoretically be : 1920×1075.

  


  Now, obviously ffmpeg is attempting to account for that remaining .42857px on the height, but I'd prefer it just get cropped off instead (doesn't matter if it's from the top or bottom).

  


  How would I go about doing this safely for every video ?

  


  For bonus points, how do I make it swap scaling depending on if the height is greater than the width (and vice versa). For example, if the video has a ratio of 2:1, it scales using a height of 1080px instead of a width of 1920px.

  


• How to stich images into a video with resolution larger then 4K using FFMPEG ?

  14 janvier 2023, par Aviram Fireberger

  I have a folder with images that I've extracted from one video.
The resolution for each image is 5760 X 2880.
All images are in the following format :
out-1.jpg, out-2.jpg , out-3.jpg ..... out-1000.jpg

  


  I tried couple of different ways to stich them :

  


  Using CPU - libx264

  


  ffmpeg -r 30 -f image2 -s 5760X2880 -start_number 1 -i "AllFrames/out-%d.jpg" -vframes 119 -vcodec libx264 -crf 25  -pix_fmt yuv420p "/AllVideoChunks/Chunk_1.mp4"


  


  Worked well but the speed is about X0.05 only.

  


  Using GPU - h264_nvenc

  


  ffmpeg -r 30 -f image2 -s 4000X2000 -start_number 1 -i "AllFrames/out-%d.jpg" -vframes 119 -vcodec h264_nvenc -gpu  0 -preset slow -b:v 75M  -pix_fmt yuv420p"/AllVideoChunks/Chunk_1.mp4"


  


  Working very fast and high quality, but the problem is that I can't use it for images and output bigger then width 4096

  


  Using GPU - hevc_nvenc

  


  ffmpeg -r 30 -f image2 -s 5760X2880 -start_number 1 -i "AllFrames/out-%d.jpg" -vframes 119 -vcodec hevc_nvenc -gpu  0 -preset slow -b:v 75M  -pix_fmt yuv420p"/AllVideoChunks/Chunk_1.mp4"


  


  Working X10 more then the CPU at the speed of X0.5, good quality, but the problem is that I can't use it in normal players (can't play it in Unity)

  


  Is there another video codec that can work on GPU that support more then 4K resolution ?
Can I transform the 'hevc_nvenc ' output to 'h264' on GPU in higher resolution ? should I do this transformation on CPU ?