[FFmpeg-user] encode to RAW video

[Paul B Mahol]

On 10/25/22, Michael Koch <astroelectronic at t-online.de> wrote:
> Am 25.10.2022 um 09:29 schrieb Naveen.B:
>>>
>>> What do you want to do with the RAW video? You know that you can't play
>>> it with most players?
>>>
>>> Yes, I know it cannot be played with most of th players, I need to see
>>> the
>>> size of the RAW video and make some compression on it for our further
>>> analysis.
>>      Could you please help me on the missing parameters to generate the
>> RAW
>> video?
>
> I did some tests and came to the conclusion that it's impossible to
> import a group of numbered raw images.
> It's possible to import a single raw image.
> It's possible to import a group of numbered images (JPG, PNG, TIF...)
> But it's not possible to import a numbered group of raw images.
> (To the experts: Please correct me if I'm wrong).
>
> Anyway it's a bad idea to save the images in raw format. You should use
> PNG images, which have a lossless compression, and 16-bit depth is possible.
> I recommend that you convert your images to PNG, and then things become
> much easier.
>
> Here is a (Windows) batch file with a few examples:
>
> rem  Make 30 PNG images (48-bit per pixel):
> ffmpeg -f lavfi -i testsrc2=s=320x200,format=rgb48 -frames 30 -f image2
> -y image-%%03d.png
>
> rem  Convert these 30 images to a raw video (this conversion is lossless):
> ffmpeg -i image-%%03d.png -s 320x200 -pixel_format rgb48 -f rawvideo
> -c:v rawvideo -y video.raw
>
> rem  The size of the raw video is exactly 320 * 200 * 2 * 3 * 30 =
> 11520000 Bytes
>
> rem  Convert the first frame from the raw video to a PNG image (48-bit
> per pixel):
> ffmpeg -video_size 320x200 -pixel_format rgb48 -f rawvideo -i video.raw
> -frames 1 -y image.png
>
> rem  Convert the raw video to a (almost lossless) MP4 video:
> ffmpeg -video_size 320x200 -pixel_format rgb48 -f rawvideo -framerate 30
> -i video.raw -crf 0 -y video.mp4
>
> pause
>
>
> I have a question to the experts. The above example works fine with
> pixel format rgb48, but with pixel formats gray16 or gray10le the MP4
> output looks wrong. I don't yet understand why.
>

Not all muxers support all pixel formats as raw.

> Michael
>
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
>