我遇到了一个问题，ffmpeg 挂起了而不是编码。
我正在尝试使用 nvenc nvidia hw accel 编码器。
下面的日志表明它正在（尝试）使用 cuda。
不过，我怀疑它挂起的原因是因为其正在尝试使用 cuda。
有没有办法使用 nvenc 编码器无需使用 cuda？
因此，作为解决问题过程的一部分，我尝试使用 nvenc 但不使用 cuda - 这可能吗？
:ubuntu:/dev/shm> ffmpeg -y -f h264 -i foo0.h264 -c:v h264_nvenc -pix_fmt yuv420p foo0x.mp4 -loglevel debug
ffmpeg version N-94712-gcc78783 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 8 (Ubuntu 8.3.0-6ubuntu1)
configuration: --prefix=/home/ubuntu/ffmpeg_compile/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_compile/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_compile/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/ubuntu/ffmpeg_compile/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
libavutil 56. 34.100 / 56. 34.100
libavcodec 58. 56.101 / 58. 56.101
libavformat 58. 32.104 / 58. 32.104
libavdevice 58. 9.100 / 58. 9.100
libavfilter 7. 58.102 / 7. 58.102
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
Splitting the commandline.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'h264'.
Reading option '-i' ... matched as input url with argument 'foo0.h264'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'h264_nvenc'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv420p'.
Reading option 'foo0x.mp4' ... matched as output url.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option loglevel (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input url foo0.h264.
Applying option f (force format) with argument h264.
Successfully parsed a group of options.
Opening an input file: foo0.h264.
[h264 @ 0x55b6755a19c0] Opening 'foo0.h264' for reading
[file @ 0x55b6755a2500] Setting default whitelist 'file,crypto'
[h264 @ 0x55b6755a19c0] Before avformat_find_stream_info() pos: 0 bytes read:32768 seeks:0 nb_streams:1
[AVBSFContext @ 0x55b6755ca0c0] nal_unit_type: 7(SPS), nal_ref_idc: 3
[AVBSFContext @ 0x55b6755ca0c0] nal_unit_type: 8(PPS), nal_ref_idc: 3
[AVBSFContext @ 0x55b6755ca0c0] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x55b6755a3840] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x55b6755a3840] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x55b6755a3840] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x55b6755a3840] Format yuv420p chosen by get_format().
[h264 @ 0x55b6755a3840] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0x55b6755a3840] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
Last message repeated 5 times
[h264 @ 0x55b6755a19c0] Probe buffer size limit of 5000000 bytes reached
[h264 @ 0x55b6755a19c0] Stream #0: not enough frames to estimate rate; consider increasing probesize
[h264 @ 0x55b6755a19c0] After avformat_find_stream_info() pos: 5142528 bytes read:5144576 seeks:0 frames:7
Input #0, h264, from 'foo0.h264':
Duration: N/A, bitrate: N/A
Stream #0:0, 7, 1/1200000: Video: h264 (High 4:4:4 Predictive), 1 reference frame, yuv420p(progressive, left), 1920x1080 (1920x1088) [SAR 1:1 DAR 16:9], 0/1, 25 fps, 25 tbr, 1200k tbn, 50 tbc
Successfully opened the file.
Parsing a group of options: output url foo0x.mp4.
Applying option c:v (codec name) with argument h264_nvenc.
Applying option pix_fmt (set pixel format) with argument yuv420p.
Successfully parsed a group of options.
Opening an output file: foo0x.mp4.
[file @ 0x55b6755a4ec0] Setting default whitelist 'file,crypto'
Successfully opened the file.
detected 16 logical cores
[h264 @ 0x55b6755a7280] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x55b6755a7280] nal_unit_type: 8(PPS), nal_ref_idc: 3
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_nvenc))
Press [q] to stop, [?] for help
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
Last message repeated 1 times
[h264 @ 0x55b6755a7280] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x55b6755a7280] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x55b6755a7280] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 0x55b6755a7280] Format yuv420p chosen by get_format().
[h264 @ 0x55b6755a7280] Reinit context to 1920x1088, pix_fmt: yuv420p
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b675db2140] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b675acb740] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b675c0b540] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b675c28040] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b675c448c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b675c61080] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b675c7d840] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b675c9a000] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b675882700] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b67589ef80] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b6758bb740] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b6758d7f00] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b6758f49c0] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[h264 @ 0x55b675911180] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
[h264 @ 0x55b67592d940] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
[graph 0 input from stream 0:0 @ 0x55b67576c400] Setting 'video_size' to value '1920x1080'
[graph 0 input from stream 0:0 @ 0x55b67576c400] Setting 'pix_fmt' to value '0'
[graph 0 input from stream 0:0 @ 0x55b67576c400] Setting 'time_base' to value '1/1200000'
[graph 0 input from stream 0:0 @ 0x55b67576c400] Setting 'pixel_aspect' to value '1/1'
[graph 0 input from stream 0:0 @ 0x55b67576c400] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 0x55b67576c400] Setting 'frame_rate' to value '25/1'
[graph 0 input from stream 0:0 @ 0x55b67576c400] w:1920 h:1080 pixfmt:yuv420p tb:1/1200000 fr:25/1 sar:1/1 sws_param:flags=2
[format @ 0x55b676ffc280] Setting 'pix_fmts' to value 'yuv420p'
[AVFilterGraph @ 0x55b675a83d00] query_formats: 4 queried, 3 merged, 0 already done, 0 delayed
[h264_nvenc @ 0x55b6755a8700] Loaded lib: libcuda.so.1
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuInit
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuDeviceGetCount
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuDeviceGet
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuDeviceGetAttribute
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuDeviceGetName
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuDeviceComputeCapability
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuCtxCreate_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuCtxSetLimit
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuCtxPushCurrent_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuCtxPopCurrent_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuCtxDestroy_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuMemAlloc_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuMemAllocPitch_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuMemsetD8Async
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuMemFree_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuMemcpy2D_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuMemcpy2DAsync_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuGetErrorName
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuGetErrorString
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuStreamCreate
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuStreamQuery
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuStreamSynchronize
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuStreamDestroy_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuStreamAddCallback
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuEventCreate
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuEventDestroy_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuEventSynchronize
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuEventQuery
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuEventRecord
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuLaunchKernel
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuModuleLoadData
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuModuleUnload
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuModuleGetFunction
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuTexObjectCreate
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuTexObjectDestroy
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuGLGetDevices_v2
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuGraphicsGLRegisterImage
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuGraphicsUnregisterResource
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuGraphicsMapResources
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuGraphicsUnmapResources
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuGraphicsSubResourceGetMappedArray
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuDeviceGetUuid
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuImportExternalMemory
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuDestroyExternalMemory
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuExternalMemoryGetMappedBuffer
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuExternalMemoryGetMappedMipmappedArray
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuMipmappedArrayGetLevel
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuMipmappedArrayDestroy
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuImportExternalSemaphore
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuDestroyExternalSemaphore
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuSignalExternalSemaphoresAsync
[h264_nvenc @ 0x55b6755a8700] Loaded sym: cuWaitExternalSemaphoresAsync
[h264_nvenc @ 0x55b6755a8700] Loaded lib: libnvidia-encode.so.1
[h264_nvenc @ 0x55b6755a8700] Loaded sym: NvEncodeAPICreateInstance
[h264_nvenc @ 0x55b6755a8700] Loaded sym: NvEncodeAPIGetMaxSupportedVersion
[h264_nvenc @ 0x55b6755a8700] Loaded Nvenc version 9.0
[h264_nvenc @ 0x55b6755a8700] Nvenc initialized successfully
[h264_nvenc @ 0x55b6755a8700] 1 CUDA capable devices found
[h264_nvenc @ 0x55b6755a8700] [ GPU #0 - < Tesla M60 > has Compute SM 5.2 ]
[h264_nvenc @ 0x55b6755a8700] supports NVENC
:ubuntu:/dev/shm>