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libav: where to get a reference to AV_PIX_FMT_NV12 when using cuda/cuvid?
What are the differences and similarities between ffmpeg, libav, and avconv?libav/ffmpeg: avcodec_decode_video2() returns -1 when separating demultiplexing and decodingRGB-frame encoding - FFmpeg/libavConverting RGB frames to YUV420P using FFmpeg/C++Transcode of H.264 to VP8 using libav* has incorrect frame rateData loss while converting from jpeg to BGRA using ffmpegFFMPEG API — How much do stream parameters change frame-to-frame?Saving raw YUV420P frame FFmpeg/LibavLibav (ffmpeg) copying decoded video timestamps to encoderLibAV converting a streaming audio file to PCM
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Say I'm using av_hwdevice_find_type_by_name("cuda"), as in here. I need to convert the decoded frames to RGB using a SwsContext. I know, by experience, that when using the cuda/cuvid decoder I get frames in the AV_PIX_FMT_NV12 format, even though every struct I look at says either AV_PIX_FMT_NONE or AV_PIX_FMT_YUV420P.
On what field of what struct can I get the AV_PIX_FMT_NV12 value so I can remove my hardcoded source format on my call to SwsContext.sws_scale? Thanks!
Update:
Looks like I can get it by:
AVCodecContext* avctx;
...
frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
AVPixelFormat pixel_fmt = frames_ctx->sw_format;
...once at least one frame has been decoded. Not sure if it's the correct way though.
ffmpeg libav
asked Mar 27 at 21:30
Simon LabrecqueSimon Labrecque
4176 silver badges11 bronze badges
add a comment |
Say I'm using av_hwdevice_find_type_by_name("cuda"), as in here. I need to convert the decoded frames to RGB using a SwsContext. I know, by experience, that when using the cuda/cuvid decoder I get frames in the AV_PIX_FMT_NV12 format, even though every struct I look at says either AV_PIX_FMT_NONE or AV_PIX_FMT_YUV420P.
On what field of what struct can I get the AV_PIX_FMT_NV12 value so I can remove my hardcoded source format on my call to SwsContext.sws_scale? Thanks!
Update:
Looks like I can get it by:
AVCodecContext* avctx;
...
frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
AVPixelFormat pixel_fmt = frames_ctx->sw_format;
...once at least one frame has been decoded. Not sure if it's the correct way though.
ffmpeg libav
asked Mar 27 at 21:30
Simon LabrecqueSimon Labrecque
4176 silver badges11 bronze badges
add a comment |
Say I'm using av_hwdevice_find_type_by_name("cuda"), as in here. I need to convert the decoded frames to RGB using a SwsContext. I know, by experience, that when using the cuda/cuvid decoder I get frames in the AV_PIX_FMT_NV12 format, even though every struct I look at says either AV_PIX_FMT_NONE or AV_PIX_FMT_YUV420P.
On what field of what struct can I get the AV_PIX_FMT_NV12 value so I can remove my hardcoded source format on my call to SwsContext.sws_scale? Thanks!
Update:
Looks like I can get it by:
AVCodecContext* avctx;
...
frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
AVPixelFormat pixel_fmt = frames_ctx->sw_format;
...once at least one frame has been decoded. Not sure if it's the correct way though.
ffmpeg libav
asked Mar 27 at 21:30
Simon LabrecqueSimon Labrecque
4176 silver badges11 bronze badges
Say I'm using av_hwdevice_find_type_by_name("cuda"), as in here. I need to convert the decoded frames to RGB using a SwsContext. I know, by experience, that when using the cuda/cuvid decoder I get frames in the AV_PIX_FMT_NV12 format, even though every struct I look at says either AV_PIX_FMT_NONE or AV_PIX_FMT_YUV420P.
On what field of what struct can I get the AV_PIX_FMT_NV12 value so I can remove my hardcoded source format on my call to SwsContext.sws_scale? Thanks!
Update:
Looks like I can get it by:
AVCodecContext* avctx;
...
frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
AVPixelFormat pixel_fmt = frames_ctx->sw_format;
...once at least one frame has been decoded. Not sure if it's the correct way though.
ffmpeg libav
ffmpeg libav
asked Mar 27 at 21:30
Simon LabrecqueSimon Labrecque
4176 silver badges11 bronze badges
asked Mar 27 at 21:30
Simon LabrecqueSimon Labrecque
4176 silver badges11 bronze badges
edited Mar 28 at 0:11
Simon Labrecque
asked Mar 27 at 21:30
Simon LabrecqueSimon Labrecque
4176 silver badges11 bronze badges
asked Mar 27 at 21:30
Simon LabrecqueSimon Labrecque
4176 silver badges11 bronze badges
asked Mar 27 at 21:30
Simon LabrecqueSimon Labrecque
4176 silver badges11 bronze badges
4176 silver badges11 bronze badges
add a comment |
add a comment |
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As for CUDA, your best bet will be when see AV_PIX_FMT_YUV420P on AVHWFramesContext::sw_format consider it as AV_PIX_FMT_NV12 and when AV_PIX_FMT_YUV420P10 it is actually AV_PIX_FMT_P010.
As far as I know, neither CUDA nor NVDEC(was CUVID) support anything other than 420 format as decoded frames.
answered Mar 29 at 13:48
the kamilzthe kamilz
9121 gold badge8 silver badges13 bronze badges
That's basically what I'm already doing and what I want to avoid (eg, assuming something based on prior knowledge). But see my update above, I can actually get the AV_PIX_FMT_NV12 at runtime now. Just wondering if it's the correct/universal way.
– Simon Labrecque
Mar 29 at 18:33
Perhaps after decoding, what you did is correct way. I was assuming before decoding.
– the kamilz
Apr 1 at 7:11
add a comment |
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As for CUDA, your best bet will be when see AV_PIX_FMT_YUV420P on AVHWFramesContext::sw_format consider it as AV_PIX_FMT_NV12 and when AV_PIX_FMT_YUV420P10 it is actually AV_PIX_FMT_P010.
As far as I know, neither CUDA nor NVDEC(was CUVID) support anything other than 420 format as decoded frames.
answered Mar 29 at 13:48
the kamilzthe kamilz
9121 gold badge8 silver badges13 bronze badges
That's basically what I'm already doing and what I want to avoid (eg, assuming something based on prior knowledge). But see my update above, I can actually get the AV_PIX_FMT_NV12 at runtime now. Just wondering if it's the correct/universal way.
– Simon Labrecque
Mar 29 at 18:33
Perhaps after decoding, what you did is correct way. I was assuming before decoding.
– the kamilz
Apr 1 at 7:11
add a comment |
As for CUDA, your best bet will be when see AV_PIX_FMT_YUV420P on AVHWFramesContext::sw_format consider it as AV_PIX_FMT_NV12 and when AV_PIX_FMT_YUV420P10 it is actually AV_PIX_FMT_P010.
As far as I know, neither CUDA nor NVDEC(was CUVID) support anything other than 420 format as decoded frames.
answered Mar 29 at 13:48
the kamilzthe kamilz
9121 gold badge8 silver badges13 bronze badges
That's basically what I'm already doing and what I want to avoid (eg, assuming something based on prior knowledge). But see my update above, I can actually get the AV_PIX_FMT_NV12 at runtime now. Just wondering if it's the correct/universal way.
– Simon Labrecque
Mar 29 at 18:33
Perhaps after decoding, what you did is correct way. I was assuming before decoding.
– the kamilz
Apr 1 at 7:11
add a comment |
As for CUDA, your best bet will be when see AV_PIX_FMT_YUV420P on AVHWFramesContext::sw_format consider it as AV_PIX_FMT_NV12 and when AV_PIX_FMT_YUV420P10 it is actually AV_PIX_FMT_P010.
As far as I know, neither CUDA nor NVDEC(was CUVID) support anything other than 420 format as decoded frames.
answered Mar 29 at 13:48
the kamilzthe kamilz
9121 gold badge8 silver badges13 bronze badges
As for CUDA, your best bet will be when see AV_PIX_FMT_YUV420P on AVHWFramesContext::sw_format consider it as AV_PIX_FMT_NV12 and when AV_PIX_FMT_YUV420P10 it is actually AV_PIX_FMT_P010.
As far as I know, neither CUDA nor NVDEC(was CUVID) support anything other than 420 format as decoded frames.
answered Mar 29 at 13:48
the kamilzthe kamilz
9121 gold badge8 silver badges13 bronze badges
answered Mar 29 at 13:48
the kamilzthe kamilz
9121 gold badge8 silver badges13 bronze badges
answered Mar 29 at 13:48
the kamilzthe kamilz
9121 gold badge8 silver badges13 bronze badges
answered Mar 29 at 13:48
the kamilzthe kamilz
9121 gold badge8 silver badges13 bronze badges
9121 gold badge8 silver badges13 bronze badges
That's basically what I'm already doing and what I want to avoid (eg, assuming something based on prior knowledge). But see my update above, I can actually get the AV_PIX_FMT_NV12 at runtime now. Just wondering if it's the correct/universal way.
– Simon Labrecque
Mar 29 at 18:33
Perhaps after decoding, what you did is correct way. I was assuming before decoding.
– the kamilz
Apr 1 at 7:11
add a comment |
That's basically what I'm already doing and what I want to avoid (eg, assuming something based on prior knowledge). But see my update above, I can actually get the AV_PIX_FMT_NV12 at runtime now. Just wondering if it's the correct/universal way.
– Simon Labrecque
Mar 29 at 18:33
Perhaps after decoding, what you did is correct way. I was assuming before decoding.
– the kamilz
Apr 1 at 7:11
That's basically what I'm already doing and what I want to avoid (eg, assuming something based on prior knowledge). But see my update above, I can actually get the AV_PIX_FMT_NV12 at runtime now. Just wondering if it's the correct/universal way.
– Simon Labrecque
Mar 29 at 18:33
That's basically what I'm already doing and what I want to avoid (eg, assuming something based on prior knowledge). But see my update above, I can actually get the AV_PIX_FMT_NV12 at runtime now. Just wondering if it's the correct/universal way.
– Simon Labrecque
Mar 29 at 18:33
Perhaps after decoding, what you did is correct way. I was assuming before decoding.
– the kamilz
Apr 1 at 7:11
Perhaps after decoding, what you did is correct way. I was assuming before decoding.
– the kamilz
Apr 1 at 7:11
add a comment |
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