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• ffplay keep video/audio sync when using select filter

  24 août 2016, par arrietaeguren

  I’m trying to play/skip some clips of a video using ffplay. My first approach to skip say frames 100 to 400 was :

  ffplay -vf "select='lte(n\,100)+gte(n\,400)'" -i INPUT

  this skips the desired frames, however it also freezes the video during the skipped frames. I tried to fix this by modifying the video presentation time stamp (PTS) with the setpts option :

  ffplay -vf "select='lte(n\,100)+gte(n\,400)',setpts='PREV_OUTPTS'" -i INPUT

  this seems to work (stills freeze a bit, guess is because of buffering), but now the audio is out of sync. I’ve tried applying a select filter and modifying the PTS on the audio as well

  ffplay -vf "select='lte(n\,100)+gte(n\,400)',setpts='PREV_OUTPTS'" -af "aselect='lte(n\,100)+gte(n\,400)',asetpts='PREV_OUTPTS'" -i INPUT

  this skips some audio frames, but still out of sync. I’ve tried with the aresample=async=10000 option with similar results. Moving some/all of the filters to the output (placing them after the -i INPUT) doesn’t work either.

  Does someone know how to skip parts of a video using ffplay ? Many thanks

• How to use ffmpeg read realtime microphone audio volume ?

  7 juin 2020, par Cyrus

  I have Google this proplem, Here is a simliar problem

  



  But when i exectue following command

  



  val command = arrayOf("/usr/local/bin/ffmpeg",
    "-f", "avfoundation",
    "-i", ":2",
    "-t", "5",
    "-ar", "11025",
    "-ac", "1",
    "-acodec","aac", "-")


  



  I got this error Unknown input format: 'avfoundation'
Who has ideas for this problem ?

  



  PS : My platform is android, i am using android-ffmpeg lib.

  


• How to use Jaffree with Spring Boot for streaming a RTSP flow

  25 août 2022, par Jmarchi

  Im trying to build a APIRest and one of the things i want to do is recirculate the rtsp video provided by some security cameras to the frontend.

  


  I have found the Jaffree, a dependency that integrates the ffmpeg into spring, until then all is good.

  


  The problem is when i try to send the video to the frontend (make in React) i recieve this error :

  


  


  Starting process : ffmpeg

  


  Waiting for process to finish

  


  ...

  


  Input #0, mpjpeg, from __________

  


  Duration : N/A, bitrate : N/A

  


  Stream #0:0 : Video : mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn

  


  [warning] Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (tcp ://127.0.0.1:52225) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.

  


  Output #0, ismv, to 'tcp ://127.0.0.1:52225' :

  


  Metadata :

  


  encoder : Lavf59.27.100

  


  Stream #0:0 : Video : mjpeg (Baseline) (mp4v / 0x7634706D), yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 tbr, 10000k tbn

  


  Stream mapping :

  


  Stream #0:0 -> #0:0 (copy)

  


  frame= 21 fps=7.2 q=-1.0 size= 252kB time=00:00:00.80 bitrate=2580.9kbits/s speed=0.275x

  


  ...

  


   : Interrupting starter thread (task-1) because of exception : TCP negotiation failed

  


  


  The code in the backend is this :

  


  @GetMapping(value = "/{id}/video")&#xA;public ResponseEntity<streamingresponsebody> getVideo() {&#xA;        String url = "**********";&#xA;&#xA;        return ResponseEntity.ok()&#xA;                .contentType(MediaType.APPLICATION_OCTET_STREAM)&#xA;                .body(os ->{&#xA;                    FFmpeg.atPath()&#xA;                            .addArgument("-re")&#xA;                            .addArguments("-acodec", "pcm_s16le")&#xA;                            // .addArguments("-rtsp_transport", "tcp")&#xA;                            .addArguments("-i", url)&#xA;                            .addArguments("-vcodec", "copy")&#xA;                            .addArguments("-af", "asetrate=22050")&#xA;                            .addArguments("-acodec", "aac")&#xA;                            .addArguments("-b:a", "96k" )&#xA;                            .addOutput(PipeOutput.pumpTo(os)&#xA;                                    .disableStream(StreamType.AUDIO)&#xA;                                    .disableStream(StreamType.SUBTITLE)&#xA;                                    .disableStream(StreamType.DATA)&#xA;                                    .setFrameCount(StreamType.VIDEO, 100L)&#xA;                                     //1 frame every 10 seconds&#xA;                                    .setFrameRate(0.1)&#xA;                                    .setDuration(1, TimeUnit.HOURS)&#xA;                                    .setFormat("ismv"))&#xA;                            .addArgument("-nostdin")&#xA;                            .execute();&#xA;                });&#xA;    }&#xA;</streamingresponsebody>

  


  And this is the html part :

  


  <video width="100%" height="auto" controls="controls" autoplay="autoplay" muted="muted" src="http://localhost:7500/***/1/video">&#xA;                Sorry, your browser doesn&#x27;t support embedded videos.&#xA;            </video>&#xA;

  


  What is it missing for the TCP negotiation ?