On 23/11/16 03:09, desktop ready wrote: > Hello, > > I would like to confirm a bug/problem before submitting a bug report. > I am working on Debian Jessie/Stable amd64 on an Intel Skylake i3-6320 > and would like to decode an HEVC 8-bit encoded UHD movie. > > With a fresh ffmpeg github checkout I am able to use the following > command without errors: > ffmpeg -hwaccel vaapi -i castle.mp4 -f null - > > However with ffmpeg release 3.2, I have the following errors: > [AVHWDeviceContext @ 0x7fdcf83adba0] No VA display found for device: . > [vaapi @ 0x30a61e0] Failed to create a VAAPI device > vaapi hwaccel requested for input stream #0:0, but cannot be > initialized. > [hevc @ 0x52bad20] Error parsing NAL unit #0.
The device selection for VAAPI works as follows, stopping at the first usable device it finds: 1) If the user passed a device name, try to open that name an X11 display. 2) If they didn't, try to open the default X11 display (i.e. $DISPLAY). 3) If the user passed a device name, try to open that name as the path to a DRM device. 4) If they didn't, try to open /dev/dri/renderD128 as a DRM device. Step 4 was added after the release of ffmpeg 3.2, so you only get steps 1-3 there. Since you didn't pass a device name and (presumably) aren't running X, it doesn't manage to open anything. In general, you always want to give it a device name; the implicit selection may be right in some cases but it's better not to rely on it. ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -i castle.mp4 -f null - > However what is strange is that the ffmpeg version 3.2.2 on Debian > Jessie Backports also works without error (but with a high CPU > workload, which may indicate that hwaccel is not working as expected). > > Ouput of ls -al /dev/dri: > ls -al /dev/dri > total 0 > drwxr-xr-x 2 root root 100 nov. 23 00:40 . > drwxr-xr-x 19 root root 3520 nov. 23 03:59 .. > crw-rw----+ 1 root video 226, 0 nov. 23 03:19 card0 > crw-rw---- 1 root video 226, 64 nov. 23 00:40 controlD64 > crw-rw----+ 1 root video 226, 128 nov. 23 00:40 renderD128 > > Is hwaccel vaapi working or not working on ffmpeg 3.2 to decode HEVC > 8-bit encoded media ? Yes. - 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".
