On Tue, 26 Mar 2019 at 18:21, Yufei He <y...@matrox.com> wrote: > On 03/26/2019 08:53 AM, Timo Rothenpieler wrote: > On 26/03/2019 13:47, Yufei He wrote: > Hi > > Is there option for scaling on transcoding ? > > e.g. transcoding from a quadhd file to 640 * 480. > > Thanks. > > Yufei. > > > Yes there is, but this is ffmpeg-devel, so not the place to ask user > questions. > > Yes, I see the option of -vf scale=width:height > We can do scaling on decoding or encoding, my question was to check if > there is scaling option for codec. > I'll add special scaling option to our codec. > > Hello there,
Scaling comes in two forms (correct me if I'm wrong): 1. Specific video filters, such as the scale filters, and other hardware-accelerated implementations, such as scale_npp, scale_cuda, scale_vaapi, etc. 2. Decoders (Not too sure if equating the private -resize option provided by these decoders is equivalent to "scaling"): See the example provided by the likes of the cuvid implementations, such as h264_cuvid, etc: ffmpeg -h decoder=h264_cuvid The -resize option therein acts as a scaler. Are you planning to implement a codec-specific hardware (or software-based) scaler (implemented as a video filter or a decoder), with similar functionality? _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
