Hacktoberfest 2026: le issue che i maintainer hanno segnato per ottobre, aperte e adatte ai principianti. Sfoglia le issue Hacktoberfest

Inconsistent FPS during recording to mp4

Aperta
  • Qualcosa non va?
#1,817 3 commenti 0 reazioni 0 assegnatari Vedi su GitHub

I maintainer di solito rispondono entro 2 giorni

Nessuno ha ancora preso questa issue.

Valutazione

Difficoltà
4/5
Tempo stimato
Più di una settimana
Idoneità per principianti
12/100
Tipo di issue
Bug
Chiarezza
Da chiarire
Stato di attività
Ferma
Stack tecnologico
android, java, kotlin, nginx
Ambito
audio-video-rtc, mobile-dev

Direzione di ricerca

The report covers Camera2Source with GenericStream in the Android library and gives no file name, test, or reproduction steps. Start by finding where the recorder and the video frame timestamps are handled, but expect to reproduce the drop on a device first. Done would mean a root cause for the intermittent fps drop, confirmed by a fix or a reproduction in the maintainer's own footage.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Describe the bug
We have seen footage recorded have a transient bug which causes the FPS to drop while recording to an MP4 file. We are using h264 encoding w/ 1280x720p @ 30fps (android fps Range [30, 30]) w/ 4Mbps bitrate with AAC audio encoding @ 96Kbps bitrate. Normally, all the footage recorded follows the consistent 30fps setting, with ffprobe reporting ~29.82 fps or similar values. However, footage which have the bug present, will report an average fps from ffprobe of ~22fps or even as low as ~5 or ~6fps, which is below even the variable FPS range supported on our device (the lowest FPS range with a 30fps maximum is [7, 30]). This has become a problem because when footage is finished being recorded, the audio and video appear out of sync. For now, we have a process which detects footage with this bug, and simply trans-codes it to keep both tracks in sync by inserting duplicate frames. This makes the footage appear choppy or slowed, which is not ideal for our customers.

I know this is not a great description in terms of debugging, but we have not been able to reliably reproduce the problem yet. We are still trying, but currently we have only seen the issue on customer devices, and we cannot provide their footage as example. We are working to get example footage of our own, and to narrow down steps to reproduce the bug.

The devices which are recording the footage are all the same model of device, so this is not a device variation issue. The device runs AOSP version 9 (SDK 28).

Expected behavior
Recorded footage should maintain avg. fps @ 30 ([30, 30] on android).

Smartphone (please complete the following information):

  • Library version: 2.5.5 & 2.6.0
  • Device: Cammpro C8
  • OS: Android 9
  • Media server: nginx-rtmp
  • Class used: GenericStream w/ Camera2Source.
Lingua principale
Kotlin
Stelle
3k
Fork
946
Merge medio
4g 6h
PR unite (30g)
9

Preparare l'ambiente

Questo progetto non fornisce container di sviluppo, Dockerfile né guida per i contributori, quindi l'ambiente è a tuo carico: parti dal suo README e consulta la nostra guida al primo contributo per i passaggi generali.

Come iniziare

  1. Leggi tutta la issue e poi la guida ai contributi del progetto.
  2. Commenta sulla issue per dire che te ne occupi tu — evita che due persone facciano lo stesso lavoro.
  3. Fai un fork del repository e lavora su un branch.
  4. Apri una pull request che faccia riferimento al numero della issue.

Altre issue di pedroSG94/RootEncoder

Tutte le issue di pedroSG94/RootEncoder

Issue simili

Altre issue su Kotlin

Ricevi le nuove issue nella tua casella

Un breve riepilogo di issue GitHub adatte ai principianti.