[FFmpeg-user] Trouble transcoding with cuda
Dennis Mungai
dmngaie at gmail.com
Wed Sep 4 18:31:20 EEST 2019
On Wed, 4 Sep 2019 at 07:38, Ray Randomnic <randomnicode at gmail.com> wrote:
>
> Hey,
>
> Sure, any video taken by a Samsung device (such as Note or Galaxy S9 or
> S10) with the HDR10+ setting will do. A sample is posted here:
> http://awakeman.redirectme.net/web/testvideo/sample.mp4
>
> Thanks.
>
> On Tue, Sep 3, 2019 at 10:07 PM Dennis Mungai <dmngaie at gmail.com> wrote:
>
> > On Wed, 4 Sep 2019 at 04:32, Ray Randomnic <randomnicode at gmail.com> wrote:
> > >
> > > Hey folks,
> > >
> > > I'm trying to transcode an HEVC (yuv420p10le) encoded file to H264 using
> > a
> > > GTX 1650 nvenc and having issues with what I assume are the pixel formats
> > > conversions on hardware. My encode speed (in fps) is pretty low (see
> > > below), far lower than I get when transcoding HEVC -> HEVC. ffmpeg
> > version
> > > is N-94578-gd6bd902599-gcff309097a+3 (on a Windows 10 OS, though I don't
> > > think this is relevant). For the purposes of this experiment, let's say
> > I'm
> > > not concerned with lossiness with format conversions.
> > >
> > > I'd like to know what I'm doing wrong and what commands I can issue for
> > the
> > > following:
> > > decode on GPU -> format conversion (if necessary) on GPU -> encode on
> > GPU.
> > > I might not be understanding a few concepts.
> > >
> > > The combination of options that I thought were available and I tried out
> > > are:
> > > - decoder (I mostly left this blank for auto) and encoder (always
> > > h264_nvenc)
> > > - hwaccel
> > > - hwaccel_output_format
> > > - filters (vf):
> > > - format
> > > - scale_npp (for format conversion on gpu)
> > >
> > > I have no idea what the options pix_fmt or other filters like colorspace
> > do
> > > for hardware (how is pix_fmt different from hwaccel_output_format?). At
> > > this point I'm kind of stuck. Don't know how to convert formats on the
> > GPU
> > > (I assume the format conversion is happening on the CPU).
> > >
> > > Input details:
> > > ffprobe input.mp4
> > >
> > > Stream #0:0(eng): Video: hevc (Main 10) (hvc1 / 0x31637668),
> > > yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 1920x1080, 24886 kb/s, SAR
> > 1:1
> > > DAR 16:9, 29.99 fps, ...
> > >
> > > Summary of various combinations (- indicates left blank):
> > > test | hwaccel | hwaccel_output_format | filter (vf) |
> > > encodefps | note
> > > 1 | cuda | - | - | X
> > > | Failed
> > > 2 | cuda | cuda | - | X
> > > | Failed
> > > 3 | cuda | yuv420p | - | 361
> > > | Video messed up
> > > 4 | cuda | cuda | format=yuv420p | X
> > > | Failed
> > > 5 | cuvid | cuda | format=yuv420p | 91
> > > | Not using GPU decode
> > > 6 | cuda | - | format=yuv420p | 161
> > > | Not using GPU format conversion
> > > 7 | cuvid | - | format=yuv420p | 91
> > > | Not using GPU decode
> > > 8 | cuda | - | scale_npp=format=yuv420p | X
> > > | Failed
> > > 9 | cuda | cuda | scale_npp=format=yuv420p | X
> > > | Failed
> > >
> > > I would expect a speed of around test 3 (without the screwed up video).
> > Is
> > > there any way to convert the pixel formats on the hardware without
> > screwing
> > > up the video? On a similar note, I'd love for someone to explain the
> > > failing encodes.
> > >
> > > Here are the details for corresponding encodes:
> > >
> > > 1. ffmpeg -loglevel verbose -hwaccel cuda -i input.mp4 -c:v h264_nvenc
> > > output.mp4
> > >
> > > Fails with the following:
> > >
> > > [graph_1_in_0_1 @ 000001cc9670e4c0] tb:1/48000 samplefmt:fltp
> > > samplerate:48000 chlayout:0x3
> > > [hevc @ 000001cc8740fc00] NVDEC capabilities:
> > > [hevc @ 000001cc8740fc00] format supported: yes, max_mb_count: 262144
> > > [hevc @ 000001cc8740fc00] min_width: 144, max_width: 8192
> > > [hevc @ 000001cc8740fc00] min_height: 144, max_height: 8192
> > > [graph 0 input from stream 0:0 @ 000001cc87420840] w:1920 h:1080
> > > pixfmt:p010le tb:1/90000 fr:30/1 sar:1/1 sws_param:flags=2
> > > [h264_nvenc @ 000001cc8747fbc0] Loaded Nvenc version 9.0
> > > [h264_nvenc @ 000001cc8747fbc0] Nvenc initialized successfully
> > > [h264_nvenc @ 000001cc8747fbc0] 1 CUDA capable devices found
> > > [h264_nvenc @ 000001cc8747fbc0] [ GPU #0 - < GeForce GTX 1650 > has
> > > Compute SM 7.5 ]
> > > [h264_nvenc @ 000001cc8747fbc0] 10 bit encode not supported
> > > [h264_nvenc @ 000001cc8747fbc0] No NVENC capable devices found
> > > [h264_nvenc @ 000001cc8747fbc0] Nvenc unloaded
> > > Error initializing output stream 0:0 -- Error while opening encoder
> > for
> > > output stream #0:0 - maybe incorrect parameters such as bit_rate,
> > rate,
> > > width or height
> > >
> > > 2. ffmpeg -loglevel verbose -hwaccel cuda -hwaccel_output_format cuda
> > -i
> > > input.mp4 -c:v h264_nvenc output.mp4
> > >
> > > Fails with the following:
> > >
> > > [graph_1_in_0_1 @ 00000240b7932340] tb:1/48000 samplefmt:fltp
> > > samplerate:48000 chlayout:0x3
> > > [hevc @ 00000240b79e37c0] NVDEC capabilities:
> > > [hevc @ 00000240b79e37c0] format supported: yes, max_mb_count: 262144
> > > [hevc @ 00000240b79e37c0] min_width: 144, max_width: 8192
> > > [hevc @ 00000240b79e37c0] min_height: 144, max_height: 8192
> > > [graph 0 input from stream 0:0 @ 00000240b7937e00] w:1920 h:1080
> > > pixfmt:cuda tb:1/90000 fr:30/1 sar:1/1 sws_param:flags=2
> > > [h264_nvenc @ 00000240b7483700] Loaded Nvenc version 9.0
> > > [h264_nvenc @ 00000240b7483700] Nvenc initialized successfully
> > > [h264_nvenc @ 00000240b7483700] 10 bit encode not supported
> > > [h264_nvenc @ 00000240b7483700] Provided device doesn't support
> > required
> > > NVENC features
> > > [h264_nvenc @ 00000240b7483700] Nvenc unloaded
> > > Error initializing output stream 0:0 -- Error while opening encoder
> > for
> > > output stream #0:0 - maybe incorrect parameters such as bit_rate,
> > rate,
> > > width or height
> > >
> > > Alright, so it seems that the hardware h264 encoder doesn't support 10
> > > bit encodes (that's coming from the decoder). So lets try changing the
> > > format:
> > >
> > >
> > > 3. ffmpeg -loglevel verbose -hwaccel cuda -hwaccel_output_format
> > yuv420p
> > > -i input.mp4 -c:v h264_nvenc output.mp4
> > >
> > > Pretty decent encode at ~ 360 fps. Alas, the video is screwed up.
> > Colors
> > > are weird:
> > >
> > > [graph_1_in_0_1 @ 00000256c9ac7b40] tb:1/48000 samplefmt:fltp
> > > samplerate:48000 chlayout:0x3
> > > [hevc @ 00000256cbb737c0] NVDEC capabilities:
> > > [hevc @ 00000256cbb737c0] format supported: yes, max_mb_count: 262144
> > > [hevc @ 00000256cbb737c0] min_width: 144, max_width: 8192
> > > [hevc @ 00000256cbb737c0] min_height: 144, max_height: 8192
> > > [graph 0 input from stream 0:0 @ 00000256cbac7e00] w:1920 h:1080
> > > pixfmt:yuv420p tb:1/90000 fr:30/1 sar:1/1 sws_param:flags=2
> > > [h264_nvenc @ 00000256cb693700] Loaded Nvenc version 9.0
> > > [h264_nvenc @ 00000256cb693700] Nvenc initialized successfully
> > > [h264_nvenc @ 00000256cb693700] 1 CUDA capable devices found
> > > [h264_nvenc @ 00000256cb693700] [ GPU #0 - < GeForce GTX 1650 > has
> > > Compute SM 7.5 ]
> > > [h264_nvenc @ 00000256cb693700] supports NVENC
> > >
> > > Let's use a format filter to change format:
> > >
> > > 4. ffmpeg -loglevel verbose -hwaccel cuda -hwaccel_output_format cuda
> > -i
> > > input.mp4 -vf format=yuv420p -c:v h264_nvenc output.mp4
> > >
> > > Fails with the following:
> > >
> > > [graph_1_in_0_1 @ 0000019390de5c80] tb:1/48000 samplefmt:fltp
> > > samplerate:48000 chlayout:0x3
> > > [hevc @ 00000193908675c0] NVDEC capabilities:
> > > [hevc @ 00000193908675c0] format supported: yes, max_mb_count: 262144
> > > [hevc @ 00000193908675c0] min_width: 144, max_width: 8192
> > > [hevc @ 00000193908675c0] min_height: 144, max_height: 8192
> > > [graph 0 input from stream 0:0 @ 00000193a031ee80] w:1920 h:1080
> > > pixfmt:cuda tb:1/90000 fr:30/1 sar:1/1 sws_param:flags=2
> > > [auto_scaler_0 @ 00000193b7aee780] w:iw h:ih flags:'bicubic' interl:0
> > > [Parsed_format_0 @ 00000193908eee80] auto-inserting filter
> > > 'auto_scaler_0' between the filter 'graph 0 input from stream 0:0'
> > and the
> > > filter 'Parsed_format_0'
> > > Impossible to convert between the formats supported by the filter
> > 'graph
> > > 0 input from stream 0:0' and the filter 'auto_scaler_0'
> > > Error reinitializing filters!
> > > Failed to inject frame into filter network: Function not implemented
> > > Error while processing the decoded data for stream #0:0
> > >
> > > 5. ffmpeg -loglevel verbose -hwaccel cuvid -hwaccel_output_format cuda
> > > -i input.mp4 -vf format=yuv420p -c:v h264_nvenc output.mp4
> > >
> > > Succeeds, but only encodes at around 91 fps, due to, I assume, not
> > using
> > > GPU decoder. What is the difference between cuvid and cuda hwaccel
> > (why did
> > > the previous fail and this succeed)? Here is the relevant output:
> > >
> > > [graph_1_in_0_1 @ 000002152cc3cc00] tb:1/48000 samplefmt:fltp
> > > samplerate:48000 chlayout:0x3
> > > [hevc @ 000002152ac33700] Initializing cuvid hwaccel
> > > [AVHWFramesContext @ 000002152cc3f0c0] Pixel format 'yuv420p10le' is
> > not
> > > supported
> > > [hevc @ 000002152ac33700] Error initializing a CUDA frame pool
> > > cuvid hwaccel requested for input stream #0:0, but cannot be
> > initialized.
> > > [hevc @ 000002152ac33700] Error parsing NAL unit #2.
> > > [hevc @ 000002152ac79180] Could not find ref with POC 0
> > > Error while decoding stream #0:0: Operation not permitted
> > > [graph 0 input from stream 0:0 @ 000002152d638b80] w:1920 h:1080
> > > pixfmt:yuv420p10le tb:1/90000 fr:30/1 sar:1/1 sws_param:flags=2
> > > [auto_scaler_0 @ 000002152ca176c0] w:iw h:ih flags:'bicubic' interl:0
> > > [Parsed_format_0 @ 000002152d3fee40] auto-inserting filter
> > > 'auto_scaler_0' between the filter 'graph 0 input from stream 0:0'
> > and the
> > > filter 'Parsed_format_0'
> > > [auto_scaler_0 @ 000002152ca176c0] w:1920 h:1080 fmt:yuv420p10le
> > sar:1/1
> > > -> w:1920 h:1080 fmt:yuv420p sar:1/1 flags:0x4
> > > [h264_nvenc @ 000002152ac31800] Loaded Nvenc version 9.0
> > > [h264_nvenc @ 000002152ac31800] Nvenc initialized successfully
> > > [h264_nvenc @ 000002152ac31800] 1 CUDA capable devices found
> > > [h264_nvenc @ 000002152ac31800] [ GPU #0 - < GeForce GTX 1650 > has
> > > Compute SM 7.5 ]
> > > [h264_nvenc @ 000002152ac31800] supports NVENC
> > >
> > > Take out hwaccel_output:
> > >
> > > 6. ffmpeg -loglevel verbose -hwaccel cuda -i in.mp4 -vf format=yuv420p
> > > -c:v h264_nvenc out.mp4
> > >
> > > Succeeds, encodes at 161 fps (using both hardware GPU decoder and
> > > encoder, but I believe the changing of format is happening on the CPU
> > > between the two stages).
> > >
> > > [graph_1_in_0_1 @ 0000025491bf2b00] tb:1/48000 samplefmt:fltp
> > > samplerate:48000 chlayout:0x3
> > > [hevc @ 0000025491b84900] NVDEC capabilities:
> > > [hevc @ 0000025491b84900] format supported: yes, max_mb_count: 262144
> > > [hevc @ 0000025491b84900] min_width: 144, max_width: 8192
> > > [hevc @ 0000025491b84900] min_height: 144, max_height: 8192
> > > [graph 0 input from stream 0:0 @ 0000025491c0eec0] w:1920 h:1080
> > > pixfmt:p010le tb:1/90000 fr:30/1 sar:1/1 sws_param:flags=2
> > > [auto_scaler_0 @ 00000254b747cfc0] w:iw h:ih flags:'bicubic' interl:0
> > > [Parsed_format_0 @ 000002549203d840] auto-inserting filter
> > > 'auto_scaler_0' between the filter 'graph 0 input from stream 0:0'
> > and the
> > > filter 'Parsed_format_0'
> > > [auto_scaler_0 @ 00000254b747cfc0] w:1920 h:1080 fmt:p010le sar:1/1 ->
> > > w:1920 h:1080 fmt:yuv420p sar:1/1 flags:0x4
> > > [h264_nvenc @ 00000254920a0f40] Loaded Nvenc version 9.0
> > > [h264_nvenc @ 00000254920a0f40] Nvenc initialized successfully
> > > [h264_nvenc @ 00000254920a0f40] 1 CUDA capable devices found
> > > [h264_nvenc @ 00000254920a0f40] [ GPU #0 - < GeForce GTX 1650 > has
> > > Compute SM 7.5 ]
> > > [h264_nvenc @ 00000254920a0f40] supports NVENC
> > >
> > >
> > > 7. ffmpeg -loglevel verbose -hwaccel cuvid -i in.mp4 -vf
> > format=yuv420p
> > > -c:v h264_nvenc out.mp4
> > >
> > > Only encoding on GPU, not decoding (91 fps).
> > >
> > > [graph_1_in_0_1 @ 000002163875b5c0] tb:1/48000 samplefmt:fltp
> > > samplerate:48000 chlayout:0x3
> > > [hevc @ 00000216380c3c00] Initializing cuvid hwaccel
> > > [AVHWFramesContext @ 00000216387fc300] Pixel format 'yuv420p10le' is
> > not
> > > supported
> > > [hevc @ 00000216380c3c00] Error initializing a CUDA frame pool
> > > cuvid hwaccel requested for input stream #0:0, but cannot be
> > initialized.
> > > [hevc @ 00000216380c3c00] Error parsing NAL unit #2.
> > > [hevc @ 000002163813d300] Could not find ref with POC 0
> > > Error while decoding stream #0:0: Operation not permitted
> > > [graph 0 input from stream 0:0 @ 00000216387594c0] w:1920 h:1080
> > > pixfmt:yuv420p10le tb:1/90000 fr:30/1 sar:1/1 sws_param:flags=2
> > > [auto_scaler_0 @ 000002164f8a0c40] w:iw h:ih flags:'bicubic' interl:0
> > > [Parsed_format_0 @ 00000216387593c0] auto-inserting filter
> > > 'auto_scaler_0' between the filter 'graph 0 input from stream 0:0'
> > and the
> > > filter 'Parsed_format_0'
> > > [auto_scaler_0 @ 000002164f8a0c40] w:1920 h:1080 fmt:yuv420p10le
> > sar:1/1
> > > -> w:1920 h:1080 fmt:yuv420p sar:1/1 flags:0x4
> > > [h264_nvenc @ 0000021638590f40] Loaded Nvenc version 9.0
> > > [h264_nvenc @ 0000021638590f40] Nvenc initialized successfully
> > > [h264_nvenc @ 0000021638590f40] 1 CUDA capable devices found
> > > [h264_nvenc @ 0000021638590f40] [ GPU #0 - < GeForce GTX 1650 > has
> > > Compute SM 7.5 ]
> > > [h264_nvenc @ 0000021638590f40] supports NVENC
> > >
> > > Lets see if I can do format conversion in the GPU (instead of GPU ->
> > CPU
> > > -> GPU), by using the scale_npp filter.
> > >
> > > 8. ffmpeg -loglevel verbose -hwaccel cuda -i input.mp4 -vf
> > > scale_npp=format=yuv420p -c:v h264_nvenc output.mp4
> > >
> > > Fails
> > >
> > > [graph_1_in_0_1 @ 0000022f3001e080] tb:1/48000 samplefmt:fltp
> > > samplerate:48000 chlayout:0x3
> > > [hevc @ 0000022f207d7f40] NVDEC capabilities:
> > > [hevc @ 0000022f207d7f40] format supported: yes, max_mb_count: 262144
> > > [hevc @ 0000022f207d7f40] min_width: 144, max_width: 8192
> > > [hevc @ 0000022f207d7f40] min_height: 144, max_height: 8192
> > > [graph 0 input from stream 0:0 @ 0000022f3034ee80] w:1920 h:1080
> > > pixfmt:p010le tb:1/90000 fr:30/1 sar:1/1 sws_param:flags=2
> > > [auto_scaler_0 @ 0000022f47b2d300] w:iw h:ih flags:'bicubic' interl:0
> > > [Parsed_scale_npp_0 @ 0000022f20c49b40] auto-inserting filter
> > > 'auto_scaler_0' between the filter 'graph 0 input from stream 0:0'
> > and the
> > > filter 'Parsed_scale_npp_0'
> > > Impossible to convert between the formats supported by the filter
> > 'graph
> > > 0 input from stream 0:0' and the filter 'auto_scaler_0'
> > > Error reinitializing filters!
> > > Failed to inject frame into filter network: Function not implemented
> > > Error while processing the decoded data for stream #0:0
> > >
> > >
> > > 9. ffmpeg -loglevel verbose -hwaccel cuda -hwaccel_output_format cuda
> > -i
> > > in.mp4 -vf scale_npp=format=yuv420p -c:v h264_nvenc out.mp4
> > >
> > > Fails:
> > >
> > > [graph_1_in_0_1 @ 00000200040adac0] tb:1/48000 samplefmt:fltp
> > > samplerate:48000 chlayout:0x3
> > > [hevc @ 00000200747b65c0] NVDEC capabilities:
> > > [hevc @ 00000200747b65c0] format supported: yes, max_mb_count: 262144
> > > [hevc @ 00000200747b65c0] min_width: 144, max_width: 8192
> > > [hevc @ 00000200747b65c0] min_height: 144, max_height: 8192
> > > [graph 0 input from stream 0:0 @ 00000200040aa8c0] w:1920 h:1080
> > > pixfmt:cuda tb:1/90000 fr:30/1 sar:1/1 sws_param:flags=2
> > > [Parsed_scale_npp_0 @ 0000020074c75b80] Unsupported input format:
> > p010le
> > > [Parsed_scale_npp_0 @ 0000020074c75b80] Failed to configure output pad
> > > on Parsed_scale_npp_0
> > > Error reinitializing filters!
> > > Failed to inject frame into filter network: Function not implemented
> > > Error while processing the decoded data for stream #0:0
> > >
> > >
> > > I'd appreciate any help or pointer in the right direction (even an
> > > alternate mailing list).
> >
> >
> > Hey there,
> >
> > Could you kindly provide a download link to the sample of the input
> > file you're working on?
> > That way we can reproduce what you're seeing here, thanks!
Another thing:
What version of FFmpeg are you running?
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