On Mon, Mar 26, 2018 at 7:27 AM, Jim Shupert <jshup...@theppsgroup.com> wrote:
> On 3/25/2018 9:30 PM, Gabriel Balaich wrote: > >> >> -i video="Video (00 Pro Capture HDMI 4K+)" >>> >>> a question - what is your capture card? > _______________________________________________ > > It is the Magewell Pro Capture HDMI 4K Plus: http://www.magewell.com/pro-capture-hdmi-4k-plus Also just a few more updates, I assumed it was something to do with negative time stamps but that doesn't seem to be the case. After adding -segment_format_options avoid_negative_ts=make_zero the problem persists: ffmpeg -y -thread_queue_size 9999 -f dshow -video_size 3440x1440 -rtbufsize 2147.48M -framerate 100 -pixel_format nv12 ^ -itsoffset 00:00:00.015 -i video="Video (00 Pro Capture HDMI 4K+)" -thread_queue_size 9999 -guess_layout_max 0 -f dshow ^ -rtbufsize 2147.48M -i audio="SPDIF/ADAT (1+2) (RME Fireface UC)" -map 0:0,1:0 -map 1:0 -c:v h264_nvenc -preset: llhp ^ -pix_fmt nv12 -b:v 250M -minrate 250M -maxrate 250M -bufsize 250M -b:a 384k -ac 2 -r 100 -vsync 1 ^ -max_muxing_queue_size 9999 -f segment -segment_time 300 -segment_wrap 9 ^ -segment_format_options avoid_negative_ts=make_zero C:\Users\djcim\Videos\PC\PC\PC%02d.mp4 Unless when shifting a negative time stamp to zero it is also shifts other timestamps the same amount? I'm not really sure how to view time stamps, so it's hard for me to know this is having any effect at all. But if that is the case Maybe there is a way to route that format option to only audio (per segment), but options seem limited with -segment_format_options. Or I guess options seem limited in general when applying any type of "option" or effect per segment as opposed to the initial segment and nothing after. I believe only options from 19.0 - 19.1 in the ffmpeg documentation can be applied on a per segment basis, correct me if I'm wrong. When trying -segment_format_options async=1 for example it threw an error. Even if there was a way for me to slightly delay the audio per segment perhaps I could alleviate my issues to an extent, would be nice if I could find an actual fix though. I found a forum post on the "creative cow" forum by a user who seems to be experiencing the same thing as me: https://forums.creativecow.net/thread/291/1587 However he has a mic plugged into a camera directly, pulling video and audio from said camera, and is still experiencing audio drift when implementing segmentation. So I assume my issues have nothing to do with my audio and video streams coming from different sources. Unfortunately it seems no solution was found in this forum post. Every time I've thought that I hit a roadblock using ffmpeg I've always found a way forward, even after searching for fixes for weeks at time. I've been trying to figure out this last part for months, things are looking dismal. Any suggestions at all, even crazy ones, would be extremely appreciated. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".