[FFmpeg-user] Trouble transcoding with cuda

[Dennis Mungai]

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!