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• Use ffmpeg to modify single frame without remux ?

  6 février 2017, par 1337GameDev

  I am curious of a fast way to modify a video, slightly, as to force the video to hash differently than the source. I want to avoid changes to meta tags, as these are parsed from the container file and not the video data itself.

  I will be using a process to compare videos for analytical work, but the process requires the 2 inputs to have differing hashes for the video content (otherwise the analytical process yields odd results). I am testing an improvement on this process, and need to have very similar videos.

  I have currently just used a ffmpeg bash script and filtered a VERY light 2x2 pixel for the first second of the video (90% transparent) and this seems to do the trick as they hash differently, but it requires demux / remux of the video, which takes forever if I want to analyze a lot of videos.

  Is there a way, using ffmpeg, to simple modify a single frame (specified by a time value) and change a single pixel and just copy the rest of the video contents ?

• Evolution #4115 : export des metas du plugin MOTS

  20 mars 2018, par Arnaud Bérard

  J’ai tendance à penser que le ticket est invalide car le plugin ieconfig n’a rien voir avec le core.

  PS : je me suis toujours dit que c’était une très mauvaise idée d’insérer un pipeline dédié à un plugin dans tous les plugins du core pour les besoins d’un plugin ne faisant pas partie du core.

  Oui on a déjà abordé le sujet sur Gis, moi je suis pas contre, voir même plutôt pour, que ce soit enlevé du plugin mot, car je déclare tout mes exports depuis mon squelette.

  La le souci justement c’est que c’est déclaré mais pas de la "bonne" manière, si on se reporte a ce qui est fait dans le plugin menu.

  C’est un cas spécifique, j’admet et c’est peut être plus du coté de ieconfig qu’il faudrait normaliser dans la doc ’prefix_meta’ pour les meta et ’prefix’ pour les objets exportés.

• ffmpeg command to merge file with good quality

  21 janvier 2016, par Hemant Kumar

  I am looking for a better command that can merge both audio & video files into one with a better quality.

  I found this command from Muaz Khan’s WebRTC APIs.

  ffmpeg -i {$audioFile} -i {$videoFile} -map 0:0 -map 1:0 {$mergedFileName}

  Later on server i had to add "-strict -2" with this command as on server it says that above command is experimental if I still want to use it you should add "-strict -2" with it.

  It is working well but my video file (.webm) with size 2.2MB and audio file (.wav) with size 1.5MB was merged into a new file (.webm) with size 422.5KB. This new video file is having lag.

  Also I want the meta information for duration of video is already written on the resulting video file.

  Is there any command which can give the merged file without lagging and both video and audio of the new file are of good quality ?