[FFmpeg-user] Failed setup for format vulkan: hwaccel initialisation returned error for Arc A750
Terje J. Hanssen
terjejhanssen at gmail.com
Wed Aug 21 23:54:10 EEST 2024
Den 21.08.2024 22:31, skrev Greg Oliver:
> On Wed, Aug 21, 2024 at 2:41 PM Terje J. Hanssen
> <terjejhanssen at gmail.com> wrote:
>>
>>
>> Den 15.08.2024 20:29, skrev Terje J. Hanssen:
>>>
>>> tor. 15. aug. 2024, 13:27 skrev Wang, Fei W<fei.w.wang at intel.com>:
>>>
>>> On Wed, 2024-08-14 at 22:43 +0300, Dennis Mungai wrote:
>>> > On Wed, 14 Aug 2024 at 15:27, Terje J. Hanssen
>>> ><terjejhanssen at gmail.com> wrote:
>>> > >
>>> > >
>>> > > Den 14.08.2024 14:22, skrev Dennis Mungai:
>>> > >
>>> > > > On Wed, Aug 14, 2024, 15:15 Terje J. Hanssen
>>> > > ><terjejhanssen at gmail.com> wrote:
>>> > > >
>>> > > > >
>>> > > > >
>>> > > > > Den 14.08.2024 02:05, skrev Dennis Mungai:
>>> > > > >
>>> > > > > > On Wed, 14 Aug 2024, 02:59 Dennis Mungai,
>>> <dmngaie at gmail.com>
>>> > > > > > wrote:
>>> > > > > >
>>> > > > > > > On Wed, 14 Aug 2024, 02:45 Terje J. Hanssen,
>>> > > > > > ><terjejhanssen at gmail.com> wrote:
>>> > > > > > >
>>> > > > > > > >
>>> > > > > > > >
>>> > > > > > > > Den 13.08.2024 19:40, skrev Dennis Mungai:
>>> > > > > > > >
>>> > > > > > > > > On Tue, 13 Aug 2024 at 19:49, Andrew Randrianasulu
>>> > > > > > > > ><randrianasulu at gmail.com>
>>> > > > > > > > > wrote:
>>> > > > > > > > >
>>> > > > > > > > >
>>> > > > > > > > > > вт, 13 авг. 2024 г., 19:46 Terje J. Hanssen
>>> > > > > > > > > ><terjejhanssen at gmail.com>:
>>> > > > > > > > > >
>>> > > > > > > > > >
>>> > > > > > > > > > > Hi,
>>> > > > > > > > > > >
>>> > > > > > > > > > > I try to test Vulkan h264 or h265 decoding
>>> > > > > > > > > > > according to test command at
>>> > > > > > > > > > >https://trac.ffmpeg.org/wiki/HWAccelIntro#Vulkan
>>> > > > > > > > > > > ffmpeg -init_hw_device "vulkan=vk:0" -hwaccel
>>> > > > > > > > > > > vulkan
>>> > > > > > > > > > > -hwaccel_output_format vulkan -i INPUT -f null - -
>>> > > > > > > > > > > benchmark
>>> > > > > > > > > > >
>>> > > > > > > > > > > but get the following output error:
>>> > > > > > > > > > > [h264 @ 0x55952760cf40] Failed setup for format
>>> > > > > > > > > > > vulkan: hwaccel
>>> > > > > > > > > > > initialisation returned error.
>>> > > > > > > > > > > or
>>> > > > > > > > > > > [hevc @ 0x5580e96e8c80] Failed setup for format
>>> > > > > > > > > > > vulkan: hwaccel
>>> > > > > > > > > > > initialisation returned error.
>>> > > > > > > > > > >
>>> > > > > > > > > > > Any suggestion how to solve it?
>>> > > > > > > > > > >
>>> > > > > > > > > > Honestly, no idea .. try ffmpeg matrix/irc
>>> channel or
>>> > > > > > > > > > ffmpeg-user?
>>> > > > > > > > > >
>>> > > > > > > > > This has to do with your input file. Your log
>>> indicates
>>> > > > > > > > > that you're
>>> > > > > > > > > attempting to decode 10-bit H.264, and from my
>>> > > > > > > > > suspicion, almost zero GPUs
>>> > > > > > > > > implement 10-bit H.264 decode.
>>> > > > > > > > > You can verify via vainfo's output to see the decoder
>>> > > > > > > > > limitation(s) for
>>> > > > > > > > > H.264 levels, etc.
>>> > > > > > > > > Try decoding any of the sample file from Kodi's H.264
>>> > > > > > > > > sample collection:
>>> > > > > > > > >
>>> https://kodi.wiki/view/Samples#Codecs,_Framerates,_Blac
>>> > > > > > > > > k-levels_and_Subtitles
>>> > > > > > > > > And report back.
>>> > > > > > > > > _______________________________________________
>>> > > > > > > > >
>>> > > > > > > >
>>> > > > > > > > 1) Thank you for your suspicion regarding almost zero
>>> > > > > > > > GPUs implement 10-bit H.264 decode.
>>> > > > > > > > This is obviously true in my case, because when I
>>> tested
>>> > > > > > > > a h264 8-bit yuv420p file, the hwaccel
>>> > > > > > > > initialisation error was away. Full ffmpeg output
>>> report
>>> > > > > > > > below using my own encoded input file.
>>> > > > > > > > (Even with a h264 8-bit yuv422p input file ffmpeg did
>>> > > > > > > > output the hwaccel initialisation error)
>>> > > > > > > >
>>> > > > > > > > 2) However Intel Arc A-series should support HEVC
>>> > > > > > > > (H.265) 10-bit 4:2:0 and 10-bit 4:2:2 decode and encode
>>> > > > > > > > formats according to this page:
>>> > > > > > > >https://www.intel.com/content/www/us/en/support/articles
>>> > > > > > > > /000098345/graphics.html
>>> > > > > > > > Also testing the corresponding input file in this
>>> format
>>> > > > > > > > get the hwaccel initialisation error, see the full
>>> ffmpeg
>>> > > > > > > > output below.
>>> > > > > > > >
>>> > > > > > > >
>>> > > > > > > >
>>> > > > > > >
>>> > > > > .......snip
>>> > > > >
>>> > > > >
>>> > > > > >
>>> > > > > > >
>>> > > > > > > > -------------
>>> > > > > > > >
>>> .....snip
>>> > > > > > > > --------------
>>> > > > > > > >
>>> > > > > > > > 2) 23M h265_yuv422p10le_SR.mp4
>>> > > > > > > >
>>> > > > > > > > ffmpeg -hide_banner -init_hw_device "vulkan=vk:0" -
>>> > > > > > > > hwaccel vulkan -hwaccel_output_format vulkan -i
>>> > > > > > > > h265_yuv422p10le_SR.mp4 -f null - -benchmark
>>> > > > > > > > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
>>> > > > > > > > 'h265_yuv422p10le_SR.mp4':
>>> > > > > > > > Metadata:
>>> > > > > > > > major_brand : isom
>>> > > > > > > > minor_version : 512
>>> > > > > > > > compatible_brands: isomiso2mp41
>>> > > > > > > > encoder : Lavf61.1.100
>>> > > > > > > > Duration: 00:01:11.16, start: 0.000000, bitrate: 2703
>>> > > > > > > > kb/s
>>> > > > > > > > Stream #0:0[0x1](und): Video: hevc (Rext) (hev1 /
>>> > > > > > > > 0x31766568), yuv422p10le(pc, smpte170m/unknown/unknown,
>>> > > > > > > > top coded first (swapped)), 1920x1080 [SAR 1:1 DAR
>>> 16:9],
>>> > > > > > > > 2700 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
>>> > > > > > > > Metadata:
>>> > > > > > > > handler_name : VideoHandler
>>> > > > > > > > vendor_id : [0][0][0][0]
>>> > > > > > > > Stream mapping:
>>> > > > > > > > Stream #0:0 -> #0:0 (hevc (native) -> wrapped_avframe
>>> > > > > > > > (native))
>>> > > > > > > > Press [q] to stop, [?] for help
>>> > > > > > > > ** [hevc @ 0x55edf209fa40] Failed setup for format
>>> > > > > > > > vulkan: hwaccel initialisation returned error.
>>> > > > > > > > ** [hevc @ 0x55edf209fa40] Unsupported film grain
>>> > > > > > > > parameters. Ignoring film grain.
>>> > > > > > > > Output #0, null, to 'pipe:':
>>> > > > > > > > Metadata:
>>> > > > > > > > major_brand : isom
>>> > > > > > > > minor_version : 512
>>> > > > > > > > compatible_brands: isomiso2mp41
>>> > > > > > > > encoder : Lavf61.1.100
>>> > > > > > > > Stream #0:0(und): Video: wrapped_avframe,
>>> > > > > > > > yuv422p10le(pc, smpte170m/unknown/unknown, progressive),
>>> > > > > > > > 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps,
>>> > > > > > > > 25 tbn (default)
>>> > > > > > > > Metadata:
>>> > > > > > > > handler_name : VideoHandler
>>> > > > > > > > vendor_id : [0][0][0][0]
>>> > > > > > > > encoder : Lavc61.3.100 wrapped_avframe
>>> > > > > > > > [out#0/null @ 0x55edf207ff40] video:764KiB audio:0KiB
>>> > > > > > > > subtitle:0KiB other streams:0KiB global headers:0KiB
>>> > > > > > > > muxing overhead: unknown
>>> > > > > > > > frame= 1779 fps=750 q=-0.0 Lsize=N/A time=00:01:11.16
>>> > > > > > > > bitrate=N/A speed= 30x
>>> > > > > > > > bench: utime=15.892s stime=0.188s rtime=2.371s
>>> > > > > > > > bench: maxrss=411104KiB
>>> > > > > > > >
>>> > > > > > >
>>> > > > > > >
>>> > > > > > > It seems that as implemented, Vulkan decoding is
>>> definitely
>>> > > > > > > failing with interlaced HEVC video, regardless of the
>>> > > > > > > underlying pixel format.
>>> > > > > > >
>>> > > > > > > The file failing on your end is interlaced HEVC,
>>> > > > > > > see h265_yuv422p10le_SR.mp4
>>> > > > > > >
>>> > > > > >
>>> > > > > > This ticket may also be relevant, interlaced HEVC
>>> encodes are
>>> > > > > > quite rare out here and may be non-spec compliant.
>>> > > > > >
>>> > > > > ======================
>>> > > > >
>>> > > > > Good points.
>>> > > > >
>>> > > > > My original ProRes422 HQ source input file before encoding to
>>> > > > > HEVC using CinelerraGG/FFmpeg, was a in a valid HD
>>> > > > > 1920x1080i25 format.
>>> > > > > I also had a look at the available ffmpeg pixel formats:
>>> > > > >
>>> > > > > ffmpeg -hide_banner -h encoder=hevc | grep yuv422p10
>>> > > > > Supported pixel formats: yuv420p yuvj420p yuv422p
>>> yuvj422p
>>> > > > > yuv444p yuvj444p gbrp yuv420p10le yuv422p10le yuv444p10le
>>> > > > > gbrp10le yuv420p12le yuv422p12le yuv444p12le gbrp12le gray
>>> > > > > gray10le gray12le
>>> > > > >
>>> > > > > ffmpeg -hide_banner -h full codecs=hevc | grep yuv422p10
>>> > > > > yuv422p10 64 ..FV.......
>>> > > > > yuv422p10 3 ..FV.......
>>> > > > >
>>> > > > > So now in a third attempt, I've tried to simply deinterlace
>>> > > > > the H.265 file, but still get the ffmpeg Vulkan hwaccel
>>> > > > > initialisation error.
>>> > > > > I'm wondering if my deinterlace code line is correct, because
>>> > > > > the deinterlaced output is smaller (halph the size) of the
>>> > > > > input file.
>>> > > > > I would have expected it larger(?)
>>> > > > >
>>> > > > > --------------
>>> > > > >
>>> > > > > ffmpeg -hide_banner -i h265_yuv422p10le_SR.mp4 -vf
>>> > > > > yadif=parity=auto -c:v libx265 -c:a copy
>>> > > > > h265_yuv422p10le_SR_deinterlaced.mp4
>>> > > > > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
>>> > > > > 'h265_yuv422p10le_SR.mp4':
>>> > > > > Metadata:
>>> > > > > major_brand : isom
>>> > > > > minor_version : 512
>>> > > > > compatible_brands: isomiso2mp41
>>> > > > > encoder : Lavf61.1.100
>>> > > > > Duration: 00:01:11.16, start: 0.000000, bitrate: 2703 kb/s
>>> > > > > Stream #0:0[0x1](und): Video: hevc (Rext) (hev1 /
>>> > > > > 0x31766568), yuv422p10le(pc, smpte170m/unknown/unknown, top
>>> > > > > coded first (swapped)), 1920x1080 [SAR 1:1 DAR 16:9], 2700
>>> > > > > kb/s, 25 fps, 25 tbr, 12800 tbn (default)
>>> > > > > Metadata:
>>> > > > > handler_name : VideoHandler
>>> > > > > vendor_id : [0][0][0][0]
>>> > > > > File 'h265_yuv422p10le_SR_deinterlaced.mp4' already exists.
>>> > > > > Overwrite? [y/N] y
>>> > > > > Stream mapping:
>>> > > > > Stream #0:0 -> #0:0 (hevc (native) -> hevc (libx265))
>>> > > > > Press [q] to stop, [?] for help
>>> > > > > x265 [info]: HEVC encoder version
>>> > > > > x265 [info]: build info [Linux][GCC 13.3.0][64 bit] 10bit
>>> > > > > x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT
>>> SSSE3
>>> > > > > SSE4.2 AVX FMA3 BMI2 AVX2
>>> > > > > x265 [info]: Main 4:2:2 10 profile, Level-4 (Main tier)
>>> > > > > x265 [info]: Thread pool created using 20 threads
>>> > > > > x265 [info]: Slices : 1
>>> > > > > x265 [info]: frame threads / pool features : 4 / wpp(17
>>> > > > > rows)
>>> > > > > x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
>>> > > > > x265 [info]: Residual QT: max TU size, max depth : 32 / 1
>>> > > > > inter / 1 intra
>>> > > > > x265 [info]: ME / range / subpel / merge : hex / 57 /
>>> > > > > 2 / 3
>>> > > > > x265 [info]: Keyframe min / max / scenecut / bias : 25 / 250
>>> > > > > / 40 / 5.00
>>> > > > > x265 [info]: Lookahead / bframes / badapt : 20 / 4 / 2
>>> > > > > x265 [info]: b-pyramid / weightp / weightb : 1 / 1 / 0
>>> > > > > x265 [info]: References / ref-limit cu / depth : 3 / off /
>>> > > > > on
>>> > > > > x265 [info]: AQ: mode / str / qg-size / cu-tree : 2 / 1.0 /
>>> > > > > 32 / 1
>>> > > > > x265 [info]: Rate Control / qCompress : CRF-28.0 /
>>> > > > > 0.60
>>> > > > > x265 [info]: tools: rd=3 psy-rd=2.00 early-skip rskip mode=1
>>> > > > > signhide tmvp
>>> > > > > x265 [info]: tools: b-intra strong-intra-smoothing lslices=6
>>> > > > > deblock sao
>>> > > > > Output #0, mp4, to 'h265_yuv422p10le_SR_deinterlaced.mp4':
>>> > > > > Metadata:
>>> > > > > major_brand : isom
>>> > > > > minor_version : 512
>>> > > > > compatible_brands: isomiso2mp41
>>> > > > > encoder : Lavf61.1.100
>>> > > > > Stream #0:0(und): Video: hevc (hev1 / 0x31766568),
>>> > > > > yuv422p10le(pc, smpte170m/unknown/unknown, progressive),
>>> > > > > 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 12800 tbn
>>> > > > > (default)
>>> > > > > Metadata:
>>> > > > > handler_name : VideoHandler
>>> > > > > vendor_id : [0][0][0][0]
>>> > > > > encoder : Lavc61.3.100 libx265
>>> > > > > Side data:
>>> > > > > cpb: bitrate max/min/avg: 0/0/0 buffer size: 0
>>> > > > > vbv_delay: N/A
>>> > > > > [out#0/mp4 @ 0x5623a778e940] video:11443KiB audio:0KiB
>>> > > > > subtitle:0KiB other streams:0KiB global headers:2KiB muxing
>>> > > > > overhead: 0.213827%
>>> > > > > frame= 1779 fps= 48 q=32.7 Lsize= 11468KiB time=00:01:11.08
>>> > > > > bitrate=1321.7kbits/s speed=1.92x
>>> > > > > x265 [info]: frame I: 9, Avg QP:26.34 kb/s: 10966.00
>>> > > > > x265 [info]: frame P: 452, Avg QP:27.25 kb/s: 3883.36
>>> > > > > x265 [info]: frame B: 1318, Avg QP:34.22 kb/s: 370.40
>>> > > > > x265 [info]: Weighted P-Frames: Y:10.2% UV:0.0%
>>> > > > >
>>> > > > > encoded 1779 frames in 36.97s (48.12 fps), 1316.56 kb/s, Avg
>>> > > > > QP:32.41
>>> > > > >
>>> > > > > ----------------
>>> > > > >
>>> > > > > 3) 12M h265_yuv422p10le_SR_deinterlaced.mp4
>>> > > > >
>>> > > > >
>>> > > > > ffmpeg -hide_banner -init_hw_device "vulkan=vk:0" -hwaccel
>>> > > > > vulkan -hwaccel_output_format vulkan -i
>>> > > > > h265_yuv422p10le_SR_deinterlaced.mp4 -f null - -benchmark
>>> > > > > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
>>> > > > > 'h265_yuv422p10le_SR_deinterlaced.mp4':
>>> > > > > Metadata:
>>> > > > > major_brand : isom
>>> > > > > minor_version : 512
>>> > > > > compatible_brands: isomiso2mp41
>>> > > > > encoder : Lavf61.1.100
>>> > > > > Duration: 00:01:11.16, start: 0.000000, bitrate: 1320 kb/s
>>> > > > > Stream #0:0[0x1](und): Video: hevc (Rext) (hev1 /
>>> > > > > 0x31766568), yuv422p10le(pc, smpte170m/unknown/unknown,
>>> > > > > progressive), 1920x1080 [SAR 1:1 DAR 16:9], 1317 kb/s, 25 fps,
>>> > > > > 25 tbr, 12800 tbn (default)
>>> > > > > Metadata:
>>> > > > > handler_name : VideoHandler
>>> > > > > vendor_id : [0][0][0][0]
>>> > > > > encoder : Lavc61.3.100 libx265
>>> > > > > Stream mapping:
>>> > > > > Stream #0:0 -> #0:0 (hevc (native) -> wrapped_avframe
>>> > > > > (native))
>>> > > > > Press [q] to stop, [?] for help
>>> > > > > [hevc @ 0x56422043e480] Failed setup for format vulkan:
>>> > > > > hwaccel initialisation returned error.
>>> > > > > Output #0, null, to 'pipe:':
>>> > > > > Metadata:
>>> > > > > major_brand : isom
>>> > > > > minor_version : 512
>>> > > > > compatible_brands: isomiso2mp41
>>> > > > > encoder : Lavf61.1.100
>>> > > > > Stream #0:0(und): Video: wrapped_avframe, yuv422p10le(pc,
>>> > > > > smpte170m/unknown/unknown, progressive), 1920x1080 [SAR
>>> 1:1 DAR
>>> > > > > 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn (default)
>>> > > > > Metadata:
>>> > > > > handler_name : VideoHandler
>>> > > > > vendor_id : [0][0][0][0]
>>> > > > > encoder : Lavc61.3.100 wrapped_avframe
>>> > > > > [out#0/null @ 0x564220459f40] video:764KiB audio:0KiB
>>> > > > > subtitle:0KiB other streams:0KiB global headers:0KiB muxing
>>> > > > > overhead: unknown
>>> > > > > frame= 1779 fps=790 q=-0.0 Lsize=N/A time=00:01:11.16
>>> > > > > bitrate=N/A speed=31.6x
>>> > > > > bench: utime=13.717s stime=0.122s rtime=2.251s
>>> > > > > bench: maxrss=418956KiB
>>> > > > >
>>> > > > > ===================================
>>> > > > >
>>> > > >
>>> > > >
>>> > > > Can I see a full dump from vainfo? Want to confirm something
>>> > > >
>>> > > > >
>>> > >
>>> ....snip
>>> >
>>> >
>>> >
>>> > According to Intel's docs on libva, the rext HEVC profile is
>>> > supported for decoding in your libva build, yet it fails on your end
>>> > (DG2).
>>> > I'm referring to the notes on
>>> >https://github.com/intel/libva/blob/master/va/va_dec_hevc.h#L242,
>>> > implying that this is tied to VAProfileHEVCScc* profile
>>> entry-points.
>>> > The failing video signals HEVC rext as it's profile.
>>> > Perhaps an intel developer can take a look at this and assist?
>>> >
>>> > Copying some of them in the thread.
>>>
>>> vainfo shows the supported entry points base on VAAPI. It doesn't mean
>>> vulkan also support them. You may use ffmpeg-vaapi to decode if you
>>> want:
>>> https://trac.ffmpeg.org/wiki/Hardware/VAAPI
>>>
>>> And more supported codec/formats can be found in intel media-driver's
>>> wiki:
>>> https://github.com/intel/media-driver
>>>
>>>
>>> Thanks
>>> Fei
>>>
>>> Is there a way to list the video formats supported by Vulkan?
>>>
>>> ...........snip
>>
>> Fwiw I tried to decode my source 10-bit ProRes 422 HQ video file - and
>> did not get the error output:
>>
>> ffmpeg -hide_banner -init_hw_device "vulkan=vk:0" -hwaccel vulkan
>> -hwaccel_output_format vulkan -i hd01.mov -f null - -benchmark
>> [aist#0:1/pcm_s24le @ 0x55d342fef940] Guessed Channel Layout: hexadecagonal
>> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'hd01.mov':
>> Metadata:
>> creation_time : 2016-02-23T23:49:21.000000Z
>> Duration: 00:01:11.28, start: 0.000000, bitrate: 200496 kb/s
>> Stream #0:0[0x1](eng): Video: prores (HQ) (apch / 0x68637061),
>> yuv422p10le(bt709, top coded first (swapped)), 1920x1080, 182130 kb/s,
> bt709 is widely supported (on a lot of platforms) though.
I just noticed the following two extracted sections in the FFmpeg
HWAccelIntro wiki:
https://trac.ffmpeg.org/wiki/HWAccelIntro
Feature support varies – for more complex codecs with many different
profiles, hardware decoders rarely implement all of them (for
example, hardware decoders tend not to implement anything beyond YUV
4:2:0 at 8-bit depth for H.264).
refer to the initial h264 example above
Internal hwaccel decoders are enabled via the -hwaccel option (now
supported in ffplay). The software decoder starts normally, but if
it detects a stream which is decodable in hardware then it will
attempt to delegate all significant processing to that hardware. If
the stream is not decodable in hardware (for example, it is an
unsupported codec or profile) then it will still be decoded in
software automatically. If the hardware requires a particular device
to function (or needs to distinguish between multiple devices, say
if several graphics cards are available) then one can be selected
using -hwaccel_device.
Possibly the latter ProRes example just is decoded automatically in
software (?)
>> SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 2500 tbn (default)
>> Metadata:
>> creation_time : 2016-02-23T23:49:21.000000Z
>> handler_name : Apple Video Media Handler
>> vendor_id : appl
>> encoder : Apple ProRes 422 (HQ)
>> Stream #0:1[0x2](eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000
>> Hz, hexadecagonal, s32 (24 bit), 18432 kb/s (default)
>> Metadata:
>> creation_time : 2016-02-23T23:49:21.000000Z
>> handler_name : Apple Sound Media Handler
>> vendor_id : [0][0][0][0]
>> Stream mapping:
>> Stream #0:0 -> #0:0 (prores (native) -> wrapped_avframe (native))
>> Stream #0:1 -> #0:1 (pcm_s24le (native) -> pcm_s16le (native))
>> Press [q] to stop, [?] for help
>> Output #0, null, to 'pipe:':
>> Metadata:
>> encoder : Lavf61.1.100
>> Stream #0:0(eng): Video: wrapped_avframe, yuv422p10le(tv, bt709, top
>> coded first (swapped)), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s,
>> 25 fps, 25 tbn (default)
>> Metadata:
>> creation_time : 2016-02-23T23:49:21.000000Z
>> handler_name : Apple Video Media Handler
>> vendor_id : appl
>> encoder : Lavc61.3.100 wrapped_avframe
>> Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, hexadecagonal, s16,
>> 12288 kb/s (default)
>> Metadata:
>> creation_time : 2016-02-23T23:49:21.000000Z
>> handler_name : Apple Sound Media Handler
>> vendor_id : [0][0][0][0]
>> encoder : Lavc61.3.100 pcm_s16le
>> [out#0/null @ 0x55d343006f40] video:765KiB audio:106920KiB subtitle:0KiB
>> other streams:0KiB global headers:0KiB muxing overhead: unknown
>> frame= 1781 fps=707 q=-0.0 Lsize=N/A time=00:01:11.24 bitrate=N/A
>> speed=28.3x
>> bench: utime=36.467s stime=0.477s rtime=2.517s
>> bench: maxrss=353584KiB
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