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• ffpmeg force overwrite (badly) detected input framerate

  20 juin 2020, par Longoon12000

  I am running IP Webcam on Android which provides an mpjpeg video stream. I have to limit the capture frame rate to 5fps to save on battery.

  


  However ffmpeg will still detect the input stream to be 25 fps, which causes it to be saved in the wrong speed causing timestamps and audio to be desynchronized.

  


  Input #0, mpjpeg, from 'https://***:***@smarthome:8080/video':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1280x720 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
Input #1, ogg, from 'https://***:***@smarthome:8080/audio.opus':
  Duration: N/A, start: 0.006500, bitrate: N/A
    Stream #1:0: Audio: opus, 48000 Hz, mono, fltp
    Metadata:
      ENCODER         : Lavf58.12.100
[stream_segment,ssegment @ 0x19b49a0] Opening '/mnt/nas/SecurityCamera/2020-06-20_14-26-04.mkv' for writing
Output #0, stream_segment,ssegment, to '/mnt/nas/SecurityCamera/%Y-%m-%d_%H-%M-%S.mkv':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 25 tbr, 1k tbn, 25 tbc
    Stream #0:1: Audio: opus, 48000 Hz, mono, fltp
    Metadata:
      ENCODER         : Lavf58.12.100
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[ogg @ 0x1753e00] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
frame=    8 fps=7.9 q=-1.0 size=N/A time=00:00:00.49 bitrate=N/A speed=0.489x


  


  As you can see it detects Input #0 to be 25 tbr, 25 tbn, 25 tbc which results in an expected 25 fps, however the fps (shown high right now but it slowly approaching 5fps) is way below 25 which causes the speed to be <1x.

  &#xA;

  I have tried to use -r 5 -i ... and -vsync 2 and different values for -enc_time_base none of which had any impact. From https://trac.ffmpeg.org/ticket/403 I've learned that -r only works on inputs with unknown fps. But my input doesn't have unknown fps, it has the wrong fps.

  &#xA;

  Is there any way to force overwrite the input fps so that I can get a proper speed of 1x and synchronized timestamps and audio ?

  &#xA;

• ffmpeg running in cloudfunction silently fails/never finishes

  19 juin 2020, par Vojtěch

  I am trying to implement a Cloudfunction which would run ffmpeg on a Google bucket upload. I have been playing with a script based on https://kpetrovi.ch/2017/11/02/transcoding-videos-with-ffmpeg-in-google-cloud-functions.html

  &#xA;&#xA;

  The original script needs little tuning as the library evolved a bit. My current version is here :

  &#xA;&#xA;

  const {Storage} = require('@google-cloud/storage');
const storage = new Storage();
const ffmpeg = require('fluent-ffmpeg');
const ffmpeg_static = require('ffmpeg-static');

console.log("Linking ffmpeg path to:", ffmpeg_static)
ffmpeg.setFfmpegPath(ffmpeg_static);

exports.transcodeVideo = (event, callback) => {
    const bucket = storage.bucket(event.bucket);
    console.log(event);
    if (event.name.indexOf('uploads/') === -1) {
        console.log("File " + event.name + " is not to be processed.")
        return;
    }

    // ensure that you only proceed if the file is newly createdxxs
    if (event.metageneration !== '1') {
        callback();
        return;
    }

    // Open write stream to new bucket, modify the filename as needed.
    const targetName = event.name.replace("uploads/", "").replace(/[.][a-z0-9]+$/, "");
    console.log("Target name will be: " + targetName);

    const remoteWriteStream = bucket.file("processed/" + targetName + ".mp4")
        .createWriteStream({
            metadata: {
                //metadata: event.metadata, // You may not need this, my uploads have associated metadata
                contentType: 'video/mp4', // This could be whatever else you are transcoding to
            },
        });

    // Open read stream to our uploaded file
    const remoteReadStream = bucket.file(event.name).createReadStream();

    // Transcode
    ffmpeg()
        .input(remoteReadStream)
        .outputOptions('-c:v copy') // Change these options to whatever suits your needs
        .outputOptions('-c:a aac')
        .outputOptions('-b:a 160k')
        .outputOptions('-f mp4')
        .outputOptions('-preset fast')
        .outputOptions('-movflags frag_keyframe+empty_moov')
        // https://github.com/fluent-ffmpeg/node-fluent-ffmpeg/issues/346#issuecomment-67299526
        .on('start', (cmdLine) => {
            console.log('Started ffmpeg with command:', cmdLine);
        })
        .on('end', () => {
            console.log('Successfully re-encoded video.');
            callback();
        })
        .on('error', (err, stdout, stderr) => {
            console.error('An error occured during encoding', err.message);
            console.error('stdout:', stdout);
            console.error('stderr:', stderr);
            callback(err);
        })
        .pipe(remoteWriteStream, { end: true }); // end: true, emit end event when readable stream ends
};



  &#xA;&#xA;

  This version correctly runs and I can see this in logs :

  &#xA;&#xA;

  2020-06-16 21:24:22.606  Function execution took 912 ms, finished with status: 'ok'
2020-06-16 21:24:52.902  Started ffmpeg with command: ffmpeg -i pipe:0 -c:v copy -c:a aac -b:a 160k -f mp4 -preset fast -movflags frag_keyframe+empty_moov pipe:1


  &#xA;&#xA;

  It seems the function execution ends before the actual ffmpeg command, which then never finishes.

  &#xA;&#xA;

  Is there a way to make the ffmpeg "synchronous" or "blocking" so that it finishes before the function execution ?

  &#xA;

• What encoders/decoders/muxers/demuxers/parsers/filters do I need to enable in FFMpeg for converting an mp4 video to a gif ?

  21 juin 2020, par kostik

  I am building FFmpeg with custom options to reduce the final size of apk file on android. I want just convert a mp4 file to a gif.&#xA;Following is my options specified

  &#xA;

   --disable-everything
 --enable-decoder=mpeg4,mpegvideo,aac,gif,h264
 --enable-parser=aac,mpeg4video,mpegaudio,mpegvideo,gif,h264
 --enable-demuxer=mpegvideo,aac,mov,gif,h264
 --enable-muxer=mp4,gif,mov,h264
 --enable-protocol=file
 --enable-encoder=mpeg4,mov,gif,h264
 --enable-filter=scale,fps,copy,palettegen,vflip,paletteuse,crop


  &#xA;

  What other options do i need to add to successfully run this command ?

  &#xA;

  ffmpeg -y -i input.mp4 -vf "fps=15,scale=320:-1:flags=lanczos" -pix_fmt rgb24 output.gif


  &#xA;

  or this command

  &#xA;

  ffmpeg -y -i input.mp4 output.gif


  &#xA;

  After I added module into Android Studio I run FFmpeg command.&#xA;Iam getting this error :

  &#xA;

  2020-06-21 12:16:09.883 8871-9102/com.example.myapplication W/mobile-ffmpeg: [graph 0 input from stream 0:0 @ 0x7088243f40] sws_param option is deprecated and ignored
2020-06-21 12:16:09.885 8871-9102/com.example.myapplication W/mobile-ffmpeg: Incompatible pixel format 'rgb24' for codec 'gif', auto-selecting format 'rgb8'
2020-06-21 12:16:09.885 8871-9102/com.example.myapplication E/mobile-ffmpeg: Output pad "default" with type video of the filter instance "Parsed_scale_1" of scale not connected to any destination
2020-06-21 12:16:09.885 8871-9102/com.example.myapplication E/mobile-ffmpeg: Error reinitializing filters!
2020-06-21 12:16:09.885 8871-9102/com.example.myapplication E/mobile-ffmpeg: Failed to inject frame into filter network: Invalid argument
2020-06-21 12:16:09.886 8871-9102/com.example.myapplication E/mobile-ffmpeg: Error while processing the decoded data for stream #0:0


  &#xA;

  I also tried to include FULL library and it that case everything worked as expected.

  &#xA;

  Thanks for your help.

  &#xA;