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Sur d’autres sites (12898)

  • seeking with av_seek_frame returns invalid data

    27 juin 2016, par mtadmk

    Based on dranger tutorial I’m trying to implement seeking in video file. Problem is with seeking to beginning milliseconds - it always returns 0 when seeking backward, or some place in file (based on file format).

    I.e. with this video file and seeking forward to 500 pts there is always 6163 pts returned. Seeking backward to 500 is always returning 0. I have no idea why.

    Code to do this :

    import java.util.Arrays;
    
import java.util.List;
    
import org.bytedeco.javacpp.BytePointer;
    
import org.bytedeco.javacpp.DoublePointer;
    
import org.bytedeco.javacpp.PointerPointer;
    
import org.bytedeco.javacpp.avcodec;
    
import org.bytedeco.javacpp.avformat;
    
import org.bytedeco.javacpp.avutil;
    
import org.bytedeco.javacpp.swscale;
    

    
import static org.bytedeco.javacpp.avcodec.av_free_packet;
    
import static org.bytedeco.javacpp.avcodec.avcodec_close;
    
import static org.bytedeco.javacpp.avcodec.avcodec_decode_video2;
    
import static org.bytedeco.javacpp.avcodec.avcodec_find_decoder;
    
import static org.bytedeco.javacpp.avcodec.avcodec_flush_buffers;
    
import static org.bytedeco.javacpp.avcodec.avcodec_open2;
    
import static org.bytedeco.javacpp.avcodec.avpicture_fill;
    
import static org.bytedeco.javacpp.avcodec.avpicture_get_size;
    
import static org.bytedeco.javacpp.avformat.AVSEEK_FLAG_BACKWARD;
    
import static org.bytedeco.javacpp.avformat.av_dump_format;
    
import static org.bytedeco.javacpp.avformat.av_read_frame;
    
import static org.bytedeco.javacpp.avformat.av_register_all;
    
import static org.bytedeco.javacpp.avformat.av_seek_frame;
    
import static org.bytedeco.javacpp.avformat.avformat_close_input;
    
import static org.bytedeco.javacpp.avformat.avformat_find_stream_info;
    
import static org.bytedeco.javacpp.avformat.avformat_open_input;
    
import static org.bytedeco.javacpp.avutil.AVMEDIA_TYPE_VIDEO;
    
import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_RGB24;
    
import static org.bytedeco.javacpp.avutil.AV_TIME_BASE;
    
import static org.bytedeco.javacpp.avutil.av_frame_alloc;
    
import static org.bytedeco.javacpp.avutil.av_frame_get_best_effort_timestamp;
    
import static org.bytedeco.javacpp.avutil.av_free;
    
import static org.bytedeco.javacpp.avutil.av_make_q;
    
import static org.bytedeco.javacpp.avutil.av_malloc;
    
import static org.bytedeco.javacpp.avutil.av_q2d;
    
import static org.bytedeco.javacpp.avutil.av_rescale_q;
    
import static org.bytedeco.javacpp.swscale.SWS_BILINEAR;
    
import static org.bytedeco.javacpp.swscale.sws_getContext;
    
import static org.bytedeco.javacpp.swscale.sws_scale;
    

    
public class SeekTest1 {
    
    private avformat.AVFormatContext videoFile;
    
    private final avcodec.AVPacket framePacket = new avcodec.AVPacket();
    
    private avcodec.AVCodecContext videoCodec;
    
    private avutil.AVFrame yuvFrame;
    
    private swscale.SwsContext scalingContext;
    
    private avutil.AVFrame rgbFrame;
    
    private int streamId;
    
    private long lastTime;
    

    
    public static void main(String[] args) {
    
        if (args.length > 0) {
    
            new SeekTest1().start(args[0]);
    
        } else {
    
            new SeekTest1().start("/path/to/file");
    
        }
    

    
    }
    

    
    private void start(String path) {
    
        init(path);
    
        //test for forward
    
//        List<integer> seekPos = Arrays.asList(0, 100, 0, 200, 0, 300, 0, 400, 0, 500, 0, 600, 0, 700);
    
        //test for backward
    
        List<integer> seekPos = Arrays.asList(10000, 8000, 10000, 7000, 10000, 6000, 10000, 4000, 10000, 2000, 10000, 1000, 10000, 200);
    
        seekPos.forEach(seekPosition -> {
    
            readFrame();
    
            seek(seekPosition);
    
        });
    
        readFrame();
    
        cleanUp();
    
    }
    

    
    long seek(long seekPosition) {
    
        final avutil.AVRational timeBase = fetchTimeBase();
    
        long timeInBaseUnit = fetchTimeInBaseUnit(seekPosition, timeBase);
    

    
        //changing flag to AVSEEK_FLAG_ANY does not change behavior
    
        int flag = 0;
    
        if (timeInBaseUnit &lt; lastTime) {
    
            flag = AVSEEK_FLAG_BACKWARD;
    
            System.out.println("seeking backward to " + timeInBaseUnit);
    
        } else {
    
            System.out.println("seeking forward to " + timeInBaseUnit);
    
        }
    
        avcodec_flush_buffers(videoCodec);
    
        av_seek_frame(videoFile, streamId, timeInBaseUnit, flag);
    
        return timeInBaseUnit;
    
    }
    

    
    private long fetchTimeInBaseUnit(long seekPositionMillis, avutil.AVRational timeBase) {
    
        return av_rescale_q((long) (seekPositionMillis / 1000.0 * AV_TIME_BASE), av_make_q(1, AV_TIME_BASE), timeBase);
    
    }
    

    
    private void readFrame() {
    
        while (av_read_frame(videoFile, framePacket) >= 0) {
    
            if (framePacket.stream_index() == streamId) {
    
                // Decode video frame
    
                final int[] frameFinished = new int[1];
    
                avcodec_decode_video2(this.videoCodec, yuvFrame, frameFinished, framePacket);
    

    
                if (frameFinished[0] != 0) {
    
                    av_free_packet(framePacket);
    
                    long millis = produceFinishedFrame();
    
                    System.out.println("produced time " + millis);
    
                    break;
    
                }
    
            }
    
            av_free_packet(framePacket);
    
        }
    
    }
    

    
    private long produceFinishedFrame() {
    
        sws_scale(scalingContext, yuvFrame.data(), yuvFrame.linesize(), 0,
    
            videoCodec.height(), rgbFrame.data(), rgbFrame.linesize());
    
        final long pts = av_frame_get_best_effort_timestamp(yuvFrame);
    
        final double timeBase = av_q2d(fetchTimeBase());
    
        final long foundMillis = (long) (pts * 1000 * timeBase);
    
        lastTime = foundMillis;
    
        return foundMillis;
    
    }
    

    
    private avutil.AVRational fetchTimeBase() {
    
        return videoFile.streams(streamId).time_base();
    
    }
    

    
    private void init(String videoPath) {
    
        final avformat.AVFormatContext videoFile = new avformat.AVFormatContext(null);
    

    
        av_register_all();
    
        if (avformat_open_input(videoFile, videoPath, null, null) != 0) throw new RuntimeException("unable to open");
    
        if (avformat_find_stream_info(videoFile, (PointerPointer) null) &lt; 0) throw new RuntimeException("Couldn't find stream information");
    

    
        av_dump_format(videoFile, 0, videoPath, 0);
    

    
        final int streamId = findFirstVideoStream(videoFile);
    

    
        final avcodec.AVCodecContext codec = videoFile.streams(streamId).codec();
    

    
        final avcodec.AVCodec pCodec = avcodec_find_decoder(codec.codec_id());
    
        if (pCodec == null) throw new RuntimeException("Unsupported codec");
    

    
        if (avcodec_open2(codec, pCodec, (avutil.AVDictionary) null) &lt; 0) throw new RuntimeException("Could not open codec");
    

    
        final avutil.AVFrame yuvFrame = av_frame_alloc();
    

    
        final avutil.AVFrame rgbFrame = av_frame_alloc();
    
        if (rgbFrame == null) throw new RuntimeException("Can't allocate avframe");
    

    
        final int numBytes = avpicture_get_size(AV_PIX_FMT_RGB24, codec.width(), codec.height());
    
        final BytePointer frameBuffer = new BytePointer(av_malloc(numBytes));
    

    
        final swscale.SwsContext swsContext = sws_getContext(codec.width(), codec.height(), codec.pix_fmt(), codec.width(), codec.height(),
    
            AV_PIX_FMT_RGB24, SWS_BILINEAR, null, null, (DoublePointer) null);
    

    
        avpicture_fill(new avcodec.AVPicture(rgbFrame), frameBuffer, AV_PIX_FMT_RGB24, codec.width(), codec.height());
    

    
        this.videoFile = videoFile;
    
        this.videoCodec = codec;
    
        this.yuvFrame = yuvFrame;
    
        this.scalingContext = swsContext;
    
        this.rgbFrame = rgbFrame;
    
        this.streamId = streamId;
    
    }
    

    
    private static int findFirstVideoStream(avformat.AVFormatContext videoFile) {
    
        int videoStream = -1;
    
        for (int i = 0; i &lt; videoFile.nb_streams(); i++) {
    
            if (videoFile.streams(i).codec().codec_type() == AVMEDIA_TYPE_VIDEO) {
    
                videoStream = i;
    
                break;
    
            }
    
        }
    
        if (videoStream == -1) throw new RuntimeException("Didn't find video stream");
    
        return videoStream;
    
    }
    

    
    private void cleanUp() {
    
        av_free(this.rgbFrame);
    
        av_free(yuvFrame);
    
        avcodec_close(videoCodec);
    
        avformat_close_input(videoFile);
    
    }
    
}
    
</integer></integer>

    As input arg should be provided file from above.

  • how to use a video stream as input in python/opencv programme

    11 juillet 2016, par vasu gupta

    I am able to stream and receive webcam feed in two terminal via udp

    command for streaming :

    ffmpeg -i /dev/video0 -b 50k -r 20 -s 858x500 -f mpegts udp://127.0.0.1:2000  

    command for recieving :

    ffplay  udp://127.0.0.1:2000

    Now i have to use this received video stream as input in python/opencv how can i do that.
    I will be doing this using rtp and rstp as well.
    But in case of rtsp it is essential to initiate the receiving terminal, but if I do that then port will become busy and my program will not be able to take the feed.How could it be resolved.
    I am currently using opencv 2.4.13, python 2.7 in ubuntu 14.04

  • FFMPEG : custom sequence input images

    14 juillet 2016, par gabber

    I created a video from a set of images.

    The command look like :

    ffmpeg -i bg.jpeg -i img_%d.png -filter_complex overlay=5:H-h-5[b]-shortest testvid.mp4

    Problem :

    The input -i img_%d.png means img_0.png, img_1.png, img_2.png, ...

    But I have custom sequence like this : {img_0.png, img_1.png, img_1.png, img_2.png, img_1.png, img5.png, img_4.png}

    Question :

    Can I put my image sequence into input of ffmpeg ?

    Updated

    cmd :

    ffmpeg -i bg.jpeg -f concat -fflags +genpts -i test.txt -filter_complex overlay=5:H-h-5 -shortest testvid.mp4

    output :

    ffmpeg version 3.1.1 Copyright (c) 2000-2016 the FFmpeg developers
    
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
    
  configuration: --enable-gpl --enable-libx264 --enable-libfreetype
    
  libavutil      55. 28.100 / 55. 28.100
    
  libavcodec     57. 48.101 / 57. 48.101
    
  libavformat    57. 41.100 / 57. 41.100
    
  libavdevice    57.  0.101 / 57.  0.101
    
  libavfilter     6. 47.100 /  6. 47.100
    
  libswscale      4.  1.100 /  4.  1.100
    
  libswresample   2.  1.100 /  2.  1.100
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, image2, from 'bg.jpeg':
    
  Duration: 00:00:00.04, start: 0.000000, bitrate: 47329 kb/s
    
    Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 600x800 [SAR 1:1 DAR 3:4], 25 tbr, 25 tbn, 25 tbc
    
Input #1, concat, from 'test.txt':
    
  Duration: N/A, start: 0.000000, bitrate: N/A
    
    Stream #1:0: Video: png, pal8(pc), 200x200, 25 tbr, 25 tbn, 25 tbc
    
File 'testvid.mp4' already exists. Overwrite ? [y/N] y
    
[swscaler @ 0x2a18360] deprecated pixel format used, make sure you did set range correctly
    
[libx264 @ 0x2a05d80] using SAR=1/1
    
[libx264 @ 0x2a05d80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
    
[libx264 @ 0x2a05d80] profile High, level 3.1
    
[libx264 @ 0x2a05d80] 264 - core 148 r2705 3f5ed56 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
[mp4 @ 0x2a04b20] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
    
Output #0, mp4, to 'testvid.mp4':
    
  Metadata:
    
    encoder         : Lavf57.41.100
    
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 600x800 [SAR 1:1 DAR 3:4], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
    
    Metadata:
    
      encoder         : Lavc57.48.101 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    
Stream mapping:
    
  Stream #0:0 (mjpeg) -> overlay:main
    
  Stream #1:0 (png) -> overlay:overlay
    
  overlay -> Stream #0:0 (libx264)
    
Press [q] to stop, [?] for help
    
[concat @ 0x29e2400] DTS -230575710986777 &lt; 0 out of order
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
DTS -230575710986777, next:40000 st:0 invalid dropping
    
PTS -230575710986777, next:40000 invalid dropping st:0
    
frame=    4 fps=0.0 q=-1.0 Lsize=      39kB time=00:00:00.04 bitrate=8050.9kbits/s dup=0 drop=65 speed=0.516x    
    
video:39kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.222729%
    
[libx264 @ 0x2a05d80] frame I:1     Avg QP:24.64  size: 37536
    
[libx264 @ 0x2a05d80] frame P:1     Avg QP:27.18  size:  1085
    
[libx264 @ 0x2a05d80] frame B:2     Avg QP:29.93  size:    73
    
[libx264 @ 0x2a05d80] consecutive B-frames: 25.0%  0.0% 75.0%  0.0%
    
[libx264 @ 0x2a05d80] mb I  I16..4:  1.7% 86.1% 12.2%
    
[libx264 @ 0x2a05d80] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  1.7%  1.3%  1.5%  0.0%  0.0%    skip:95.5%
    
[libx264 @ 0x2a05d80] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  2.4%  0.0%  0.0%  direct: 0.0%  skip:97.6%  L0:62.6% L1:37.4% BI: 0.0%
    
[libx264 @ 0x2a05d80] 8x8 transform intra:86.1% inter:33.9%
    
[libx264 @ 0x2a05d80] coded y,uvDC,uvAC intra: 91.5% 84.4% 38.5% inter: 0.6% 0.4% 0.1%
    
[libx264 @ 0x2a05d80] i16 v,h,dc,p:  9% 12%  3% 76%
    
[libx264 @ 0x2a05d80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 19% 17%  8%  4%  5%  5%  7% 10%
    
[libx264 @ 0x2a05d80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 18% 10% 10%  9%  7% 10%  8%  7%
    
[libx264 @ 0x2a05d80] i8c dc,h,v,p: 45% 21% 26%  8%
    
[libx264 @ 0x2a05d80] Weighted P-Frames: Y:0.0% UV:0.0%
    
[libx264 @ 0x2a05d80] ref B L0: 84.2% 15.8%
    
[libx264 @ 0x2a05d80] kb/s:1938.35

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