On 14.05.2016 18:41, Mark Thompson wrote: > On 13/05/16 20:43, Armin K. wrote: >> I noticed that recently a VAAPI based H264 encoder was added to ffmpeg. >> I built ffmpeg from git and now I have h264_vaapi listed in ffmpeg -encoders >> output. >> >> However, when I try to use ffmpeg ... -vcodec h264_vaapi I get the following >> error: >> >> Impossible to convert between the formats supported by the filter >> 'Parsed_null_0' and the filter 'auto-inserted scaler 0' >> >> The command I use is: >> >> ffmpeg -hwaccel vaapi -i <inputfile> -vcodec h264_vaapi <outfile>.mkv > > Short answer: > > ffmpeg -vaapi_device /dev/dri/renderD128 -i <inputfile> -vf > 'format=nv12,hwupload' -c:v h264_vaapi <outfile>.mkv > > > Longer answer: > > It's somewhat awkward to use because it only accepts input as VAAPI surfaces > (AV_PIX_FMT_VAAPI), with underlying format depending on the particular > hardware. > > "-vaapi_device" sets the hardware device to use. It takes either a DRI > device (ideally a render node, as above) or an X11 display name (only if you > are actually in X). > > Then we use libavfilter to get the input into the right form: > > "format=nv12" forces software conversion to NV12, which is the underlying > format required by the Intel driver. > > "hwupload" uploads that software image into a VAAPI surface, which can then > be fed into the encoder. > > > You need a bit more trickiness to do a pure hardware transcode, see > <https://wiki.libav.org/Hardware/vaapi> for additional explanation. > > - Mark > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". >
Thanks! That seems to work just great!
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