Re: [FFmpeg-user] A question on -tag:v and CPU usage
On Wed, 30 Oct 2019 at 05:40, Ted Park wrote: > > Does it write the video codec tag per frame, etc? > Not even, It’s per sample, iirc, but > > I ask because I'm seeing some truly abnormal results with hevc_nvenc when > > the -tag:v hvc1 option is passed where the CPU load spikes up > significantly. > hvc1 is the one with codec params in the sample description box, so I > guess it’s parsing (basically decoding, as I’ve been told) the stream to > copy it to the header. (Or box, I should say, rather. And I’m not sure if > it also deletes them after, but I’m pretty sure there’s a separate bsf that > does that though.) > Hmm thanks, that second part may explain the spike in CPU load. > > ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] A question on -tag:v and CPU usage
> Does it write the video codec tag per frame, etc? Not even, It’s per sample, iirc, but > I ask because I'm seeing some truly abnormal results with hevc_nvenc when > the -tag:v hvc1 option is passed where the CPU load spikes up significantly. hvc1 is the one with codec params in the sample description box, so I guess it’s parsing (basically decoding, as I’ve been told) the stream to copy it to the header. (Or box, I should say, rather. And I’m not sure if it also deletes them after, but I’m pretty sure there’s a separate bsf that does that though.) ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] A question on -tag:v and CPU usage
Hello there, What impact, if any, does the ffmpeg option -tag:v, when explicitly set, have on CPU usage? Does it write the video codec tag per frame, etc? I ask because I'm seeing some truly abnormal results with hevc_nvenc when the -tag:v hvc1 option is passed where the CPU load spikes up significantly. Warm regards, Dennis. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
