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ChangingFrameRate – FFmpeg
https://trac.ffmpeg.org/wiki/ChangingFrameRate#:~:text=ffmpeg%20can%20be%20used%20to%20change%20the%20frame,duration%20of%20the%20video%20will%20stay%20the%20same.
How do I change the audio frame rate with ffmpeg? - …
https://stackoverflow.com/questions/60174089/how-do-i-change-the-audio-frame-rate-with-ffmpeg
So these two options should change the frame size and frame rate of my audio stream, right? Well look what happens when I fix the frame size to 1024 and change the frame rate: $ ffmpeg -i in.mp3 -s:a 1024 -r:a 15 out.wav ... size= 2592kB time=00:00:15.04 bitrate=1411.3kbits/s speed= 262x $ ffmpeg -i in.mp3 -s:a 1024 -r:a 30 out.wav ... size= 2592kB time=00:00:15.04 …
Long video ffmpeg transcode makes audio go out of sync ...
https://video.stackexchange.com/questions/25149/long-video-ffmpeg-transcode-makes-audio-go-out-of-sync
After trying a few random things, I managed to make the audio/video sync by changing the rate of the audio: ffmpeg -i witness.mov -af asetrate=48018 resampled.mkv The resampled.mkv has correct sync, but unfortunately the audio is shorter than the remaining video for a few seconds. Which means the problem is really that the frame rate is slightly slower than it should in the …
Syncing Multiple Audio Streams With One Video Stream (FFMPEG)
https://video.stackexchange.com/questions/23131/syncing-multiple-audio-streams-with-one-video-stream-ffmpeg
ffmpeg -guess_layout_max 0 -y -f dshow -video_size 3440x1440 -rtbufsize 2147.48M -pixel_format nv12 -framerate 200 ^ -i video="Video (00 Pro Capture HDMI 4K+)":audio="SPDIF/ADAT (1+2) (RME Fireface UC)" -map 0:0,0:1 -map 0:1 ^ -preset: llhp -codec:v h264_nvenc -pix_fmt nv12 -b:v 250M -maxrate:v 250M -minrate:v 250M -bufsize:v 250M -b:a …
Non-Standard Frame Rates, Demuxed Audio and FFMpeg ...
https://forum.videohelp.com/threads/282984-Non-Standard-Frame-Rates-Demuxed-Audio-and-FFMpeg
FPS = 20.00. Now, in the past, as I told you, I would just use Avisynth with Audio/Video together and use a script 45Tripp or Jagabo or somebody gave me a long time ago to do this and it works 100% of the time (they also showed me a way to do it with DGPulldown but I like the below better): <AVISYNTH>.
FFmpeg audio and video synchronization - Programmer All
https://www.programmerall.com/article/5692378357/
Sync video to audio. Get the decoded video frame time. AVFrame vFrame； AVStream vStream； //...Analyze the video to get vStream, decode the video frame to get vFrame... double timestamp = av_frame_get_best_effort_timestamp(&vFrame)*av_q2d(vStream->time_base); Get the decoded audio frame time.
Need variable frame rate ffmpeg - VideoHelp Forum
https://forum.videohelp.com/threads/396200-Need-variable-frame-rate-ffmpeg
When you cut and/or reencode a part of vfr clip and save it as mp4 you either need to set the output frame rate this way ffmpeg will make sure it creates cfr output or you need to specify '-vsync vfr' otherwise the time codes might be messed up. If you append cfr and vfr content to mp4 you should also add '-vsync vfr'.
[Fixed] Variable Frame Rate Audio Video Out of Sync in ...
https://www.videoproc.com/troubleshoot-adobe/variable-frame-rate-av-sync-in-premiere-pro.htm
Alternatively, you can enter into the frame rate setting panel by clicking "codec / Option" icon on the video information bar. Step 3. Navigate to Frame Rate (FPS) option under Video Codec Options and pick a proper value according to the content. 24 fps and 30pfs are top choices for common videos. If the viedeo has much actions, maybe 60fps is more suitable.
r/ffmpeg - Resolving sync issue using ffmpeg - how do I ...
https://www.reddit.com/r/ffmpeg/comments/cudop5/resolving_sync_issue_using_ffmpeg_how_do_i/
ffmpeg commands I've used so far based on suggestions I've found (footage is 25 FPS). ffmpeg -async 1 -i sync.mp4 -c copy sync1.mp4 ffmpeg -async 25 -i sync.mp4 -c copy sync1.mp4 ffmpeg -async "1024" -i sync.mp4 -c copy sync1.mp4 EDIT: I've just tried: ffmpeg -i sync.mp4 -c:v copy -af aresample=async=1000 sync1.mp4
ffmpeg # 视频同步参数 -vsync & -aresample - 简书
https://www.jianshu.com/p/0b772b8d4f73
Video sync method. For compatibility reasons old values can be specified as numbers. Newly added values will have to be specified as strings always. 0, passthrough Each frame is passed with its timestamp from the demuxer to the muxer. 1, cfr Frames will be duplicated and dropped to achieve exactly the requested constant frame rate. 2, vfr
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