Hello all,
I'd like to start by saying thank you for your time and any help you can send my way, I really appreciate it. I'm trying to keep three outputs in-sync, 3 audio and 1 video. I'll start with my block of code and then I'll try to explain exactly what I'm trying to do. Here is my current block: ffmpeg -guess_layout_max 0 -y -f dshow -video_size 3440x1440 -rtbufsize 2147M -pixel_format nv12 -r 100.00 ^ -i video="Video (00 Pro Capture HDMI 4K+)":audio="Analog (1+2) (RME Fireface UC)" -map 0:0 -map 0:1 ^ -codec:v h264_nvenc -pix_fmt nv12 -b:v 250M -maxrate 250M -bufsize 250M -b:a 320k -ac 2 ^ -segment_time 600 -segment_wrap 9 -f segment C:\Users\djcim\Videos\PC\PC%02d.mp4 ^ -guess_layout_max 0 -f dshow -rtbufsize 100M -i audio="Analog (3+4) (RME Fireface UC)" -map 1:0 -b:a 320k -ac 2 ^ -segment_time 600 -segment_wrap 9 -f segment C:\Users\djcim\Videos\PC\Voices\Theirs\TheirsPC%02d.wav ^ -guess_layout_max 0 -f dshow -rtbufsize 100M -i audio="Analog (5+6) (RME Fireface UC)" -map 2:0 -b:a 320k -ac 2 ^ -segment_time 600 -segment_wrap 9 -f segment C:\Users\djcim\Videos\PC\Voices\Mine\MinePC%02d.wav I have two PC's, one that I'm gaming on, one that I'm recording on. I also have two RME audio cards (one in each respective PC) hooked up to each other to share audio between the two PC's. My main display (3440x1440 @ 100Hz) is hooked up to a displayport splitter that splits to my recording PC's capture card. I am also routing my game audio from the sound card in my gaming PC to the capture PC's sound card. On top of this I have a mic that I'm talking into and a discord (voice chat) that I'm recording simultaneously with the game / game audio. All three desired audio sources are on their own input channels on the RME audio card hooked up to the capture PC. I'm trying to keep these files separated so I can mix the volumes of the game audio, my mic, and the discord to make sure one audio source isn't overwhelming the others. Or so I can choose to entirely omit the voices altogether leaving only game audio. Also from what I understand I couldn't link multiple audio channels to one video channel with dshow per the documentation anyway. Also as seen in the block I am taking advantage of segmenting, it's much nicer to deal with 9 10 minute clips than it is to deal with a 1 130 minute clip. This way the parts are constantly overwriting each other allowing me to record continuously non-stop without filling up my SSD and giving me the last 130 minutes of content at any given time. I'm facing two problems with this setup currently: 1) the audio from my mic and the discord audio is starting before the game video/audio creating sync issues right off the bat for the rest of the recordings. 2) The game video and audio are in-sync at first but as I drop frames throughout the recordings they slowly become unsynced. I drop frames every few hours (sometimes more, sometimes less) do to the real-time buffer of the capture card getting too full. It would seem like increasing the buffer size or reducing the bitrate would fix this issue but sadly it does not. Regardless of what I do I drop a few frames every few hours do to an overfilled buffer. Basically what I am looking for is a way to start all three streams at the same time, and then when a frame is dropped just duplicate the last one to maintain the 100 fps goal keeping everything in-sync. Is this possible with the current state of FFMPEG? At first I thought -vsync was the key but after I couldn't get it working from what I gathered it doesn't work if frames drop before ingestion. I understand that this is ambitious but it has been from the start, finding hardware that allowed me to record at such a high resolution and framerate took months (and wasn't cheap). Even after obtaining the necessary hardware every software I tried to utilize it with has failed me time and time again. Until I found FFMPEG, it is so close, a truly amazing program. Thanks again for any suggestions or help. _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
