Recherche avancée

Sur d’autres sites (4080)

• Read Audio and Video, edit Video frame, then write back Audio and Video - Using python

  19 avril 2021, par CowKeyMan

  I'm looking to do exactly as the title says, ie :

  


  

  1. Read a file containing both audio and video

  


  2. Edit the video frames individually

  


  3. Write back the video with the new frames but the same exact audio as before

  


  


  OpenCV is not a good option for reading and writing since it doesn't handle audio, altough I can use opencv in step 2.

  


  The language I am using is Python, as this needs to be integrated with a bigger system.

  


  My question is this : What software stack / librarries are appropriate for this kind of task and if anyone can point me to some resources it would be highly appreciated

  


  So far I have found the following options, but would like some feedback on them based on experience :

  


  

  1. ffmpeg

  


  2. MoviePy

  


  3. libav

  


  


• FFmpeg Streaming Video SpringBoot endpoint not show video duration in video players

  7 avril 2024, par lxluxo23

  it turns out that I've been working on a personal project just out of curiosity.
the main function is to stream video by first encoding it through ffmpeg
then playback said video from any other device
call it "plex" very very primitive

  


  although I achieve my goal which is to encode and send the video to the devices that make the request
this video is sent so to speak as a live broadcast.
I can only pause it, no forward or rewind, anyone have any idea what I am doing wrong or if I should take some other approach either in my service or controller ?

  


  I leave fragments of my code

  


  THE CONTROLLER

  


  @RestController&#xA;@RequestMapping("/api")&#xA;@Log4j2&#xA;public class StreamController {&#xA;&#xA;    @Autowired&#xA;    VideoStreamingService videoStreamingService;&#xA;&#xA;    @Autowired&#xA;    VideoService videoService;&#xA;&#xA;&#xA;    @GetMapping("/stream/{videoId}")&#xA;    public ResponseEntity<streamingresponsebody> livestream(@PathVariable Long videoId,@RequestParam(required = false)  String codec) {&#xA;        Video video = videoService.findVideoById(videoId);&#xA;        if (video != null) {&#xA;            Codec codecEnum = Codec.fromString(codec);&#xA;            return ResponseEntity.ok()&#xA;                    .contentType(MediaType.valueOf("video/mp4"))&#xA;                    .body(outputStream -> videoStreamingService.streamVideo(video.getPath(), outputStream,codecEnum));&#xA;        }&#xA;        return ResponseEntity.notFound().build();&#xA;    }&#xA;}&#xA;</streamingresponsebody>

  


  THE SERVICE

  


  @Service
public class VideoStreamingService {

    public void streamVideo(String videoPath, OutputStream outputStream, Codec codec) {

        FFmpeg ffmpeg = FFmpeg.atPath()
                .addArguments("-i", videoPath)
                .addArguments("-b:v", "5000k")
                .addArguments("-maxrate", "5000k")
                .addArguments("-bufsize", "10000k")
                .addArguments("-c:a", "aac")
                .addArguments("-b:a", "320k")
                .addArguments("-movflags", "frag_keyframe+empty_moov+faststart")
                .addOutput(PipeOutput.pumpTo(outputStream)
                        .setFormat("mp4"))
                .addArgument("-nostdin");
        if (codec == Codec.AMD) {
            ffmpeg.addArguments("-profile:v", "high");
        }
        ffmpeg.addArguments("-c:v", codec.getFfmpegArgument());
        ffmpeg.execute();
    }
}


  


  I have some enums to vary the encoding and use hardware acceleration or not.

  


  and here is an example from my player
the endpoint is the following

  


  http://localhost:8080/api/stream/2?codec=AMD
screenshot

  


  I'm not sure if there's someone with more knowledge in either FFmpeg or Spring who could help me with this minor issue, I would greatly appreciate it. I've included the URL of the repository in case anyone would like to review it when answering my question

  


  repo

  


  I tried changing the encoding format.
I tried copying the metadata from the original video.
I tried sending a custom header.
None of this has worked.

  


  I would like to achieve what is mentioned in many sites, which is when you load a video from the network, the player shows how much of that video you have in the local "buffer".

  


• Changing video resolution is changing the duration of the output video the input video

  4 septembre 2017, par Sean

  I am trying to change the video resolution on a few videos as well as the frame rate using FFMPEG. I am attempting to copy the original video/audio and change the output video to have a constant frame rate and different resolution.

  Here is the command line I execute :

  `ffmpeg -i "input_video_here" -s 854x480 -c:v libx264 -preset slow -crf 18 -r 30 -refs 3 -movflags +faststart -c:a copy "#{output_video_here}"`

  When I compare the input video with the output video, my output videos are getting cut. The duration of my output video is 51 seconds and my input is 5 minutes. Is something in my ffmpeg command causing my output video to clip ?