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• ffmpeg save video H.265 from rtsp but i can't open it

  14 juin 2021, par Сергей Брандуков

  By mistake on the IP camera in the settings there was a value of the H.265 codec (should be h.264)

  


      # ffmpeg -i rtsp://admin:admin@192.168.100.22:554/main -y -c:v copy /home/ubuntu/Video/8/tst_256.mp4
ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[hevc @ 0x55e8744be3c0] Invalid NAL unit 0, skipping.
[hevc @ 0x55e8744be3c0] VPS 0 does not exist
[hevc @ 0x55e8744be3c0] Invalid NAL unit 0, skipping.
[hevc @ 0x55e8744be3c0] VPS 0 does not exist
[rtsp @ 0x55e8744ba6c0] max delay reached. need to consume packet
[rtsp @ 0x55e8744ba6c0] RTP: missed 84 packets
Input #0, rtsp, from 'rtsp://admin:admin@192.168.100.22:554/main':
  Metadata:
    title           : RTSP/RTP stream from IPNC
    comment         : main
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: hevc (Main), yuvj420p(pc, bt709), 2048x1536, 50 tbr, 90k tbn, 90k tbc
    Stream #0:1: Data: none
    Stream #0:2: Data: none
Output #0, mp4, to '/home/ubuntu/Video/8/tst_256.mp4':
  Metadata:
    title           : RTSP/RTP stream from IPNC
    comment         : main
    encoder         : Lavf58.29.100
    Stream #0:0: Video: hevc (Main) (hev1 / 0x31766568), yuvj420p(pc, bt709), 2048x1536, q=2-31, 50 tbr, 90k tbn, 90k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mp4 @ 0x55e874532440] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
[mp4 @ 0x55e874532440] Non-monotonous DTS in output stream 0:0; previous: 0, current: 0; changing to 1. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55e874532440] Non-monotonous DTS in output stream 0:0; previous: 1, current: 0; changing to 2. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55e874532440] Non-monotonous DTS in output stream 0:0; previous: 216000, current: 110136; changing to 216001. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55e874532440] Non-monotonous DTS in output stream 0:0; previous: 216001, current: 124536; changing to 216002. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55e874532440] Non-monotonous DTS in output stream 0:0; previous: 216002, current: 146226; changing to 216003. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55e874532440] Non-monotonous DTS in output stream 0:0; previous: 216003, current: 160536; changing to 216004. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55e874532440] Non-monotonous DTS in output stream 0:0; previous: 216004, current: 175026; changing to 216005. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55e874532440] Non-monotonous DTS in output stream 0:0; previous: 216005, current: 200136; changing to 216006. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55e874532440] Non-monotonous DTS in output stream 0:0; previous: 216006, current: 214536; changing to 216007. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55e874532440] Non-monotonous DTS in output stream 0:0; previous: 855816, current: 851365; changing to 855817. This may result in incorrect timestamps in the output file.
frame=  100 fps=6.6 q=-1.0 Lsize=   10247kB time=00:00:18.03 bitrate=4653.6kbits/s speed=1.19x    
video:10245kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.021781%
Exiting normally, received signal 2.


  


  there is a file, the size is not empty, the video player shows a black screen, I also can not make out the video into frames

  


  # ffmpeg -i tst_256.mp4 -q:v 1 -r 1  1/%05d.jpg
ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[AVBSFContext @ 0x555c46ce3540] No start code is found.
tst_256.mp4: could not find codec parameters
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'tst_256.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    title           : RTSP/RTP stream from IPNC
    encoder         : Lavf58.29.100
    comment         : main
  Duration: 00:00:18.04, bitrate: N/A
    Stream #0:0(und): Video: hevc (hev1 / 0x31766568), none, 2048x1536, 4652 kb/s, 5.54 fps, 90k tbn (default)
    Metadata:
      handler_name    : VideoHandler
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[hevc @ 0x555c46cf6dc0] No start code is found.
[hevc @ 0x555c46cf6dc0] Error splitting the input into NAL units.
[hevc @ 0x555c46d07300] No start code is found.
[hevc @ 0x555c46d07300] Error splitting the input into NAL units.
[hevc @ 0x555c46d17d00] No start code is found.
[hevc @ 0x555c46d17d00] Error splitting the input into NAL units.
[hevc @ 0x555c46d286c0] No start code is found.
[hevc @ 0x555c46d286c0] Error splitting the input into NAL units.
[hevc @ 0x555c46d39000] No start code is found.
[hevc @ 0x555c46d39000] Error splitting the input into NAL units.
[hevc @ 0x555c46d499c0] No start code is found.
[hevc @ 0x555c46d499c0] Error splitting the input into NAL units.
[hevc @ 0x555c46d5a400] No start code is found.
[hevc @ 0x555c46d5a400] Error splitting the input into NAL units.
[hevc @ 0x555c46d6ae40] No start code is found.
...
hevc @ 0x555c46cf6dc0] No start code is found.
[hevc @ 0x555c46cf6dc0] Error splitting the input into NAL units.
Error while decoding stream #0:0: Invalid data found when processing input
    Last message repeated 7 times
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished


  


  Is it possible to somehow extract frames from this video or the video stream was not saved ?

  


• Qt Open Source Product 2 - Vlc Demo [closed]

  3 juin 2021, par cool code

  Ⅰ. Preface

  


  The previous work was made by the FFmpeg kernel, and FFmpeg is too powerful for many beginners to understand. There are also a lot of users only need a simple video stream can be played, do not need to be involved in the responsible decoding and transcoding, so VLC came in handy, it directly made FFMPEG deep encapsulation, to provide a friendly interface. There's an MPV that does the same thing, and MPV is even better than VLC in that it's just one library file, and it looks like it's packaged as a static library, unlike VLC, VLC comes with a bunch of dynamic library files and plug-in files.
Of course, the simplicity of VLC is that it only needs a few lines of code to start, so that beginners immediately see the effect is very important, very excited, you can more quickly carry out the next step of coding, experience the fun of coding.

  


  Ⅱ. Code framework

  


  #include "ffmpeg.h"

FFmpegThread::FFmpegThread(QObject *parent) : QThread(parent)
{
    setObjectName("FFmpegThread");
    stopped = false;
    isPlay = false;

    frameFinish = false;
    videoWidth = 0;
    videoHeight = 0;
    oldWidth = 0;
    oldHeight = 0;
    videoStreamIndex = -1;
    audioStreamIndex = -1;

    url = "rtsp://192.168.1.128:554/1";

    buffer = NULL;
    avPacket = NULL;
    avFrame = NULL;
    avFrame2 = NULL;
    avFrame3 = NULL;
    avFormatContext = NULL;
    videoCodec = NULL;
    audioCodec = NULL;
    swsContext = NULL;

    options = NULL;
    videoDecoder = NULL;
    audioDecoder = NULL;

    //Initial registration, only register once in a software
    FFmpegThread::initlib();
}

//Only need to initialize once in a software
void FFmpegThread::initlib()
{
    static QMutex mutex;
    QMutexLocker locker(&mutex);
    static bool isInit = false;
    if (!isInit) {
        //Register all available file formats and decoders in the library
        av_register_all();
        //Register all devices, mainly for local camera playback support
#ifdef ffmpegdevice
        avdevice_register_all();
#endif
        //Initialize the network stream format, which must be executed first when using the network stream
        avformat_network_init();

        isInit = true;
        qDebug() << TIMEMS << "init ffmpeg lib ok" << " version:" << FFMPEG_VERSION;
#if 0
        //Output all supported decoder names
        QStringList listCodeName;
        AVCodec *code = av_codec_next(NULL);
        while (code != NULL) {
            listCodeName << code->name;
            code = code->next;
        }

        qDebug() << TIMEMS << listCodeName;
#endif
    }
}

bool FFmpegThread::init()
{
    //Before opening the code stream, specify various parameters such as: detection time/timeout time/maximum delay, etc.
    //Set the cache size, 1080p can increase the value
    av_dict_set(&options, "buffer_size", "8192000", 0);
    //Open in tcp mode, if open in udp mode, replace tcp with udp
    av_dict_set(&options, "rtsp_transport", "tcp", 0);
    //Set the timeout disconnection time, the unit is microseconds, 3000000 means 3 seconds
    av_dict_set(&options, "stimeout", "3000000", 0);
    //Set the maximum delay, in microseconds, 1000000 means 1 second
    av_dict_set(&options, "max_delay", "1000000", 0);
    //Automatically start the number of threads
    av_dict_set(&options, "threads", "auto", 0);

    //Open video stream
    avFormatContext = avformat_alloc_context();

    int result = avformat_open_input(&avFormatContext, url.toStdString().data(), NULL, &options);
    if (result < 0) {
        qDebug() << TIMEMS << "open input error" << url;
        return false;
    }

    //Release setting parameters
    if (options != NULL) {
        av_dict_free(&options);
    }

    //Get flow information
    result = avformat_find_stream_info(avFormatContext, NULL);
    if (result < 0) {
        qDebug() << TIMEMS << "find stream info error";
        return false;
    }

    //----------At the beginning of the video stream part, make a mark to facilitate the folding of the code----------
    if (1) {
        videoStreamIndex = av_find_best_stream(avFormatContext, AVMEDIA_TYPE_VIDEO, -1, -1, &videoDecoder, 0);
        if (videoStreamIndex < 0) {
            qDebug() << TIMEMS << "find video stream index error";
            return false;
        }

        //Get video stream
        AVStream *videoStream = avFormatContext->streams[videoStreamIndex];

        //Get the video stream decoder, or specify the decoder
        videoCodec = videoStream->codec;
        videoDecoder = avcodec_find_decoder(videoCodec->codec_id);
        //videoDecoder = avcodec_find_decoder_by_name("h264_qsv");
        if (videoDecoder == NULL) {
            qDebug() << TIMEMS << "video decoder not found";
            return false;
        }

        //Set up accelerated decoding
        videoCodec->lowres = videoDecoder->max_lowres;
        videoCodec->flags2 |= AV_CODEC_FLAG2_FAST;

        //Open the video decoder
        result = avcodec_open2(videoCodec, videoDecoder, NULL);
        if (result < 0) {
            qDebug() << TIMEMS << "open video codec error";
            return false;
        }

        //Get the resolution size
        videoWidth = videoStream->codec->width;
        videoHeight = videoStream->codec->height;

        //If the width and height are not obtained, return
        if (videoWidth == 0 || videoHeight == 0) {
            qDebug() << TIMEMS << "find width height error";
            return false;
        }

        QString videoInfo = QString("Video stream info -> index: %1  decode: %2  format: %3  duration: %4 s  Resolution: %5*%6")
                            .arg(videoStreamIndex).arg(videoDecoder->name).arg(avFormatContext->iformat->name)
                            .arg((avFormatContext->duration) / 1000000).arg(videoWidth).arg(videoHeight);
        qDebug() << TIMEMS << videoInfo;
    }
    //----------The video stream part starts----------

    //----------Start the audio stream part, mark it to facilitate the code folding----------
    if (1) {
        //Loop to find audio stream index
        audioStreamIndex = -1;
        for (uint i = 0; i < avFormatContext->nb_streams; i++) {
            if (avFormatContext->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
                audioStreamIndex = i;
                break;
            }
        }

        //Some have no audio stream, so there is no need to return here
        if (audioStreamIndex == -1) {
            qDebug() << TIMEMS << "find audio stream index error";
        } else {
            //Get audio stream
            AVStream *audioStream = avFormatContext->streams[audioStreamIndex];
            audioCodec = audioStream->codec;

            //Get the audio stream decoder, or specify the decoder
            audioDecoder = avcodec_find_decoder(audioCodec->codec_id);
            //audioDecoder = avcodec_find_decoder_by_name("aac");
            if (audioDecoder == NULL) {
                qDebug() << TIMEMS << "audio codec not found";
                return false;
            }

            //Open the audio decoder
            result = avcodec_open2(audioCodec, audioDecoder, NULL);
            if (result < 0) {
                qDebug() << TIMEMS << "open audio codec error";
                return false;
            }

            QString audioInfo = QString("Audio stream information -> index: %1  decode: %2  Bit rate: %3  channel num: %4  sampling: %5")
                                .arg(audioStreamIndex).arg(audioDecoder->name).arg(avFormatContext->bit_rate)
                                .arg(audioCodec->channels).arg(audioCodec->sample_rate);
            qDebug() << TIMEMS << audioInfo;
        }
    }
    //----------End of audio stream----------

    //Pre-allocated memory
    avPacket = av_packet_alloc();
    avFrame = av_frame_alloc();
    avFrame2 = av_frame_alloc();
    avFrame3 = av_frame_alloc();

    //Compare the width and height of the last file. When changing, you need to reallocate the memory
    if (oldWidth != videoWidth || oldHeight != videoHeight) {
        int byte = avpicture_get_size(AV_PIX_FMT_RGB32, videoWidth, videoHeight);
        buffer = (uint8_t *)av_malloc(byte * sizeof(uint8_t));
        oldWidth = videoWidth;
        oldHeight = videoHeight;
    }

    //Define pixel format
    AVPixelFormat srcFormat = AV_PIX_FMT_YUV420P;
    AVPixelFormat dstFormat = AV_PIX_FMT_RGB32;
    //Get the decoded format through the decoder
    srcFormat = videoCodec->pix_fmt;

    //The SWS_FAST_BILINEAR parameter used by the default fastest decoding may lose part of the picture data, and you can change it to other parameters by yourself
    int flags = SWS_FAST_BILINEAR;

    //Open up a cache to store one frame of data
    //The following two methods are ok, avpicture_fill has been gradually abandoned
    //avpicture_fill((AVPicture *)avFrame3, buffer, dstFormat, videoWidth, videoHeight);
    av_image_fill_arrays(avFrame3->data, avFrame3->linesize, buffer, dstFormat, videoWidth, videoHeight, 1);

    //Image conversion
    swsContext = sws_getContext(videoWidth, videoHeight, srcFormat, videoWidth, videoHeight, dstFormat, flags, NULL, NULL, NULL);

    //Output video information
    //av_dump_format(avFormatContext, 0, url.toStdString().data(), 0);

    //qDebug() << TIMEMS << "init ffmpeg finsh";
    return true;
}

void FFmpegThread::run()
{
    while (!stopped) {
        //Perform initialization based on the flag bit
        if (isPlay) {
            this->init();
            isPlay = false;
            continue;
        }

        if (av_read_frame(avFormatContext, avPacket) >= 0) {
            //Determine whether the current package is video or audio
            int index = avPacket->stream_index;
            if (index == videoStreamIndex) {
                //Decode video stream avcodec_decode_video2 method has been deprecated
#if 0
                avcodec_decode_video2(videoCodec, avFrame2, &frameFinish, avPacket);
#else
                frameFinish = avcodec_send_packet(videoCodec, avPacket);
                if (frameFinish < 0) {
                    continue;
                }

                frameFinish = avcodec_receive_frame(videoCodec, avFrame2);
                if (frameFinish < 0) {
                    continue;
                }
#endif

                if (frameFinish >= 0) {
                    //Turn the data into a picture
                    sws_scale(swsContext, (const uint8_t *const *)avFrame2->data, avFrame2->linesize, 0, videoHeight, avFrame3->data, avFrame3->linesize);

                    //The following two methods can be used
                    //QImage image(avFrame3->data[0], videoWidth, videoHeight, QImage::Format_RGB32);
                    QImage image((uchar *)buffer, videoWidth, videoHeight, QImage::Format_RGB32);
                    if (!image.isNull()) {
                        emit receiveImage(image);
                    }

                    msleep(1);
                }
            } else if (index == audioStreamIndex) {
                //Decode the audio stream, it will not be processed here, and will be handed over to sdl to play
            }
        }

        av_packet_unref(avPacket);
        av_freep(avPacket);
        msleep(1);
    }

    //Release resources after the thread ends
    free();
    stopped = false;
    isPlay = false;
    qDebug() << TIMEMS << "stop ffmpeg thread";
}

void FFmpegThread::setUrl(const QString &url)
{
    this->url = url;
}

void FFmpegThread::free()
{
    if (swsContext != NULL) {
        sws_freeContext(swsContext);
        swsContext = NULL;
    }

    if (avPacket != NULL) {
        av_packet_unref(avPacket);
        avPacket = NULL;
    }

    if (avFrame != NULL) {
        av_frame_free(&avFrame);
        avFrame = NULL;
    }

    if (avFrame2 != NULL) {
        av_frame_free(&avFrame2);
        avFrame2 = NULL;
    }

    if (avFrame3 != NULL) {
        av_frame_free(&avFrame3);
        avFrame3 = NULL;
    }

    if (videoCodec != NULL) {
        avcodec_close(videoCodec);
        videoCodec = NULL;
    }

    if (audioCodec != NULL) {
        avcodec_close(audioCodec);
        audioCodec = NULL;
    }

    if (avFormatContext != NULL) {
        avformat_close_input(&avFormatContext);
        avFormatContext = NULL;
    }

    av_dict_free(&options);
    //qDebug() << TIMEMS << "close ffmpeg ok";
}

void FFmpegThread::play()
{
    //Let the thread perform initialization through the flag bit
    isPlay = true;
}

void FFmpegThread::pause()
{

}

void FFmpegThread::next()
{

}

void FFmpegThread::stop()
{
    //Stop the thread through the flag
    stopped = true;
}

//Real-time video display form class
FFmpegWidget::FFmpegWidget(QWidget *parent) : QWidget(parent)
{
    thread = new FFmpegThread(this);
    connect(thread, SIGNAL(receiveImage(QImage)), this, SLOT(updateImage(QImage)));
    image = QImage();
}

FFmpegWidget::~FFmpegWidget()
{
    close();
}

void FFmpegWidget::paintEvent(QPaintEvent *)
{
    if (image.isNull()) {
        return;
    }

    //qDebug() << TIMEMS << "paintEvent" << objectName();
    QPainter painter(this);
    painter.drawImage(this->rect(), image);
}

void FFmpegWidget::updateImage(const QImage &image)
{
    //this->image = image.copy();
    this->image = image;
    this->update();
}

void FFmpegWidget::setUrl(const QString &url)
{
    thread->setUrl(url);
}

void FFmpegWidget::open()
{
    //qDebug() << TIMEMS << "open video" << objectName();
    clear();

    thread->play();
    thread->start();
}

void FFmpegWidget::pause()
{
    thread->pause();
}

void FFmpegWidget::next()
{
    thread->next();
}

void FFmpegWidget::close()
{
    //qDebug() << TIMEMS << "close video" << objectName();
    if (thread->isRunning()) {
        thread->stop();
        thread->quit();
        thread->wait(500);
    }

    QTimer::singleShot(1, this, SLOT(clear()));
}

void FFmpegWidget::clear()
{
    image = QImage();
    update();
}



  


  Ⅲ. Renderings

  


  https://youtu.be/CLsGw2CJW-c

  


  Ⅳ. Open source code download URL

  


  1.download URL for dropbox :

  


  https://www.dropbox.com/sh/n58ucs57pscp25e/AABWBQlg4U3Oz2WF9YOJDrj1a?dl=0

  


  2.download URL for box :

  


  https://app.box.com/s/x48a7ttpk667afqqdk7t1fqok4fmvmyv

  


• ffmpeg not able to open file. I/O error when attempting command

  22 juin 2021, par J. Carpenter

  Can't seem to get ffmpeg to generate a video thumbnail !

  


  command being used :
ffmpeg -i input.mp4 -ss 00:00:01.000 -vframes 1 output.png

  


  error :

  


  [image2 @ 0000023199ddf440] Could not open file : output.pngN/A speed=   0x
av_interleaved_write_frame(): I/O error
frame=    1 fps=0.4 q=-0.0 Lsize=N/A time=00:00:00.03 bitrate=N/A speed=0.0119x
video:115kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Conversion failed!