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Sur d’autres sites (11859)

  • Memory leak when using ffmpeg

    21 janvier 2017, par se210

    I have implemented a class which spawns a thread for reading and queuing frames, and the main thread displays these frames via OpenGL. I try to free the allocated memory after binding the image data to a OpenGL texture, but it seems some memory is not freed properly. The memory usage keeps growing until the system runs out of memory and eventually the frame reader thread cannot grab new frames due to memory allocation failure. Would someone please help me on what I might have missed ? Thank you.

    This is the code for the frame reader thread :

    void AVIReader::frameReaderThreadFunc()
    {
       AVPacket packet;

       while (readFrames) {
           // Allocate necessary memory
           AVFrame* pFrame = av_frame_alloc();
           if (pFrame == nullptr)
           {
               continue;
           }

           AVFrame* pFrameRGB = av_frame_alloc();
           if (pFrameRGB == nullptr)
           {
               av_frame_free(&pFrame);
               continue;
           }

           // Determine required buffer size and allocate buffer
           int numBytes = avpicture_get_size(AV_PIX_FMT_RGB24, pCodecCtx->width,
               pCodecCtx->height);
           uint8_t* buffer = (uint8_t *)av_malloc(numBytes * sizeof(uint8_t));

           if (buffer == nullptr)
           {
               av_frame_free(&pFrame);
               av_frame_free(&pFrameRGB);
               continue;
           }

           // Assign appropriate parts of buffer to image planes in pFrameRGB
           // Note that pFrameRGB is an AVFrame, but AVFrame is a superset
           // of AVPicture
           avpicture_fill((AVPicture *)pFrameRGB, buffer, AV_PIX_FMT_RGB24,
               pCodecCtx->width, pCodecCtx->height);

           if (av_read_frame(pFormatCtx, &packet) >= 0) {
               // Is this a packet from the video stream?
               if (packet.stream_index == videoStream) {
                   // Decode video frame
                   int frameFinished;
                   avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);

                   if (frameFinished) {
                       // Convert the image from its native format to RGB
                       sws_scale(sws_ctx, (uint8_t const * const *)pFrame->data,
                           pFrame->linesize, 0, pCodecCtx->height,
                           pFrameRGB->data, pFrameRGB->linesize);

                       VideoFrame vf;
                       vf.frame = pFrameRGB;
                       vf.pts = av_frame_get_best_effort_timestamp(pFrame) * time_base;
                       frameQueue.enqueue(vf);

                       av_frame_unref(pFrame);
                       av_frame_free(&pFrame);
                   }
               }
               //av_packet_unref(&packet);
               av_free_packet(&packet);
           }
       }
    }

    This is the code that grabs the queued frames and binds it to an OpenGL texture. I explicitly save the previous frame until I switch it out with the next frame. Otherwise, it seems to cause a segfault.

    void AVIReader::GrabAVIFrame()
    {
       if (curFrame.pts >= clock_pts)
       {
           return;
       }

       if (frameQueue.empty())
           return;

       // Get a packet from the queue
       VideoFrame videoFrame = frameQueue.top();
       while (!frameQueue.empty() && frameQueue.top().pts < clock_pts)
       {
           videoFrame = frameQueue.dequeue();
       }

       glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, videoFrame.frame->data[0]);

       // release previous frame
       if (curFrame.frame)
       {
           av_free(curFrame.frame->data[0]);
       }
       av_frame_unref(curFrame.frame);

       // set current frame to new frame
       curFrame = videoFrame;
    }

    The frameQueue is a thread-safe priority queue that holds VideoFrame defined as :

    class VideoFrame {
    public:
       AVFrame* frame;
       double pts;
    };

    Update : There was a silly error in the ordering of setting current frame to new frame. I forgot to switch it back after trying some things out. I also incorporated @ivan_onys’s suggestion, but that does not seem to fix the problem.


    Update 2 : I adopted @Al Bundy’s suggestion to release pFrame and packet unconditionally, but the issue still persists.

    Since buffer is what contains the actual image data which needs to be used in glTexSubImage2D(), I cannot release it until I am done displaying it on the screen (otherwise I get a segfault). avpicture_fill() assigns frame->data[0] = buffer, so I think calling av_free(curFrame.frame->data[0]) ; on the previous frame after texture mapping the new frame should release the allocated buffer.

    Here is the updated frame reader thread code :

    void AVIReader::frameReaderThreadFunc()
    {
       AVPacket packet;

       while (readFrames) {
           // Allocate necessary memory
           AVFrame* pFrame = av_frame_alloc();
           if (pFrame == nullptr)
           {
               continue;
           }

           AVFrame* pFrameRGB = av_frame_alloc();
           if (pFrameRGB == nullptr)
           {
               av_frame_free(&pFrame);
               continue;
           }

           // Determine required buffer size and allocate buffer
           int numBytes = avpicture_get_size(AV_PIX_FMT_RGB24, pCodecCtx->width,
               pCodecCtx->height);
           uint8_t* buffer = (uint8_t *)av_malloc(numBytes * sizeof(uint8_t));

           if (buffer == nullptr)
           {
               av_frame_free(&pFrame);
               av_frame_free(&pFrameRGB);
               continue;
           }

           // Assign appropriate parts of buffer to image planes in pFrameRGB
           // Note that pFrameRGB is an AVFrame, but AVFrame is a superset
           // of AVPicture
           avpicture_fill((AVPicture *)pFrameRGB, buffer, AV_PIX_FMT_RGB24,
               pCodecCtx->width, pCodecCtx->height);

           if (av_read_frame(pFormatCtx, &packet) >= 0) {
               // Is this a packet from the video stream?
               if (packet.stream_index == videoStream) {
                   // Decode video frame
                   int frameFinished;
                   avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);

                   if (frameFinished) {
                       // Convert the image from its native format to RGB
                       sws_scale(sws_ctx, (uint8_t const * const *)pFrame->data,
                           pFrame->linesize, 0, pCodecCtx->height,
                           pFrameRGB->data, pFrameRGB->linesize);

                       VideoFrame vf;
                       vf.frame = pFrameRGB;
                       vf.pts = av_frame_get_best_effort_timestamp(pFrame) * time_base;
                       frameQueue.enqueue(vf);
                   }
               }
           }
           av_frame_unref(pFrame);
           av_frame_free(&pFrame);
           av_packet_unref(&packet);
           av_free_packet(&packet);
       }
    }

    Solved : It turned out the leaks were happening when the packet was from a non-video stream (e.g. audio). I also needed to free resources on frames that are skipped in the while-loop of GrabAVIFrame().

  • avcodec/hevc_sei : fix amount of bits skipped when reading picture timing SEI message

    6 mai 2017, par James Almer
    avcodec/hevc_sei : fix amount of bits skipped when reading picture timing SEI message
    

    The code was skipping the entire reported SEI message size regardless of
    the amount of bits read.
    While in theory safe for NALU where the picture timing SEI message is alone
    or at the end as we're using the checked bitstream reader, it isn't in any
    other situation, where every SEI message in the NALU after the picture
    timing one would potentially fail to parse.

    Change the function name to one more in line with the rest of file, and
    remove the bogus "Skipped SEI" debug message while at it.

    Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
    Signed-off-by : James Almer <jamrial@gmail.com>

    • [DH] libavcodec/hevc_sei.c
  • How to get rtp(javacv ffmpeg) stream from VLC as client

    15 avril 2015, par Sezertt

    I am trying to play rtp stream from vlc player which I created using javacv. Here is the code :

           FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber("rtsp://10.6.0.147:554/ufirststream");
           frameGrabber.start();  // First I take another stream

           FFmpegFrameRecorder frameRecorder = new FFmpegFrameRecorder("rtp://239.31.31.69:4433", frameGrabber.getImageWidth(), frameGrabber.getImageHeight());

           frameRecorder.setFormat("rtp");
           frameRecorder.setPixelFormat(AV_PIX_FMT_YUV420P);
           frameRecorder.setVideoCodec(AV_CODEC_ID_MPEG2VIDEO); &lt;-- AV_CODEC_ID_H264
           frameRecorder.setFrameRate(25);          
           frameRecorder.setVideoBitrate(1024); &lt;--1024*1024*2            
           frameRecorder.start();
           while (true) {
               frameRecorder.record(frameGrabber.grab()); //grab from stream, stream with rtp
           }

    If I choose my codec as AV_CODEC_ID_MPEG2VIDEO I can play the stream from VLC using rtp ://239.31.31.69:4433 with open network.

    If I increase the quality using setVideoBitrate(1024*1024*2) the stream lags too much and if I decrease the quality is so bad.

    I want to use AV_CODEC_ID_H264 as my codec to fasten things with better quality but i can’t play the stream from VLC getting error :

    SDP required A description in SDP format is required to receive the RTP stream. Note that rtp :// URIs cannot work with dynamic RTP payload format (96).

    I tried to get sdp using wireshark and then I realized rtp stream doesn’t have sdp :) so I tried to create my own sdp like this

    c=IN IP4 239.31.31.69
    m=video 4433 RTP/AVP 96
    a=rtpmap:96 H264/90000

    and this

    v=0
    c=IN IP4 239.31.31.69
    a=recvonly
    t=0 0
    m=video 4433 RTP/AVP 99
    a=rtpmap:99 H264/90000
    a=fmtp:99 packetization-mode=1;profile-level-id=42c01e;sprop-parameter sets=Z0LAHukBQHsg,aM4G4g==;

    but both seems to fail similar to this

    > core debug: adding item `asf.sdp' ( file:///C:/Users/Sezer/Desktop/asf.sdp )
    core debug: processing request item: asf.sdp, node: null, skip: 0
    core debug: rebuilding array of current - root Playlist
    core debug: rebuild done - 7 items, index 6
    core debug: starting playback of the new playlist item
    core debug: resyncing on asf.sdp
    core debug: asf.sdp is at 6
    core debug: creating new input thread
    core debug: Creating an input for 'asf.sdp'
    core debug: Creating an input for 'asf.sdp'
    core debug: requesting art for asf.sdp
    core debug: using timeshift granularity of 50 MiB, in path 'C:\Users\Sezer\AppData\Local\Temp'
    core debug: `file:///C:/Users/Sezer/Desktop/asf.sdp' gives access `file' demux `' path `/C:/Users/Sezer/Desktop/asf.sdp'
    core debug: specified demux `any'
    core debug: creating demux: access='file' demux='any' location='/C:/Users/Sezer/Desktop/asf.sdp' file='C:\Users\Sezer\Desktop\asf.sdp'
    core debug: looking for access_demux module matching "file": 12 candidates
    core debug: looking for meta fetcher module matching "any": 1 candidates
    core debug: no access_demux modules matched
    core debug: creating access 'file' location='/C:/Users/Sezer/Desktop/asf.sdp', path='C:\Users\Sezer\Desktop\asf.sdp'
    core debug: looking for access module matching "file": 21 candidates
    filesystem debug: opening file `C:\Users\Sezer\Desktop\asf.sdp'
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\fetcher
    core debug: using access module "filesystem"
    core debug: Using stream method for AStream*
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher
    core debug: starting pre-buffering
    core debug: received first data after 0 ms
    core debug: pre-buffering done 193 bytes in 0s - 188476 KiB/s
    core debug: looking for stream_filter module matching "any": 6 candidates
    core debug: no stream_filter modules matched
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
    core debug: looking for stream_filter module matching "record": 6 candidates
    core debug: using stream_filter module "record"
    core debug: creating demux: access='file' demux='any' location='/C:/Users/Sezer/Desktop/asf.sdp' file='C:\Users\Sezer\Desktop\asf.sdp'
    core debug: looking for demux module matching "any": 65 candidates
    live555 debug: version 2014.07.25
    live555 debug: RTP subsession 'video/H264'
    core debug: selecting program id=0
    core debug: adding item `file.sdp' ( file:///C:/Users/Sezer/Desktop/file.sdp )
    live555 debug: setup start: 0.000000 stop:0.000000
    live555 debug: play start: 0.000000 stop:0.000000
    core debug: using demux module "live555"
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
    core debug: no meta fetcher modules matched
    core debug: looking for a subtitle file in C:\Users\Sezer\Desktop\
    core debug: searching art for asf.sdp
    core debug: looking for art finder module matching "any": 2 candidates
    core debug: looking for decoder module matching "any": 43 candidates
    avcodec debug: CPU flags: 0x010053db
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\art
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art
    avcodec debug: trying to use direct rendering
    avcodec debug: allowing 4 thread(s) for decoding
    avcodec warning: threaded frame decoding is not compatible with DXVA2, disabled
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
    core debug: meta ok for (null), need to fetch art
    core debug: Creating an input for 'file.sdp'
    avcodec debug: avcodec codec (H264 - MPEG-4 AVC (part 10)) started
    avcodec debug: using slice thread mode with 4 threads
    core debug: using decoder module "avcodec"
    core debug: looking for meta fetcher module matching "any": 1 candidates
    core debug: looking for packetizer module matching "any": 23 candidates
    core debug: using packetizer module "packetizer_h264"
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\fetcher
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher
    core debug: looking for meta reader module matching "any": 2 candidates
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\reader
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\reader
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\reader\filename.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
    core debug: no meta fetcher modules matched
    core debug: searching art for asf.sdp
    core debug: looking for art finder module matching "any": 2 candidates
    core debug: no meta reader modules matched
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
    core debug: `file:///C:/Users/Sezer/Desktop/asf.sdp' successfully opened
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\art
    core debug: meta ok for (null), need to fetch art
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
    core debug: no art finder modules matched
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
    core debug: looking for meta fetcher module matching "any": 1 candidates
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\fetcher
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
    core debug: using meta fetcher module "lua"
    core debug: removing module "lua"
    core debug: searching art for asf.sdp
    core debug: looking for art finder module matching "any": 2 candidates
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
    qt4 debug: IM: Setting an input
    core debug: no art finder modules matched
    core debug: looking for meta fetcher module matching "any": 1 candidates
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\art
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\fetcher
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
    core debug: no meta fetcher modules matched
    core debug: searching art for file.sdp
    core debug: looking for art finder module matching "any": 2 candidates
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\art
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
    core debug: no art finder modules matched
    core debug: art not found for asf.sdp
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
    lua debug: skipping script (unmatched scope) C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
    core debug: no art finder modules matched
    core debug: looking for meta fetcher module matching "any": 1 candidates
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\fetcher
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
    core debug: using meta fetcher module "lua"
    core debug: removing module "lua"
    core debug: searching art for asf.sdp
    core debug: looking for art finder module matching "any": 2 candidates
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\art
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
    core debug: no art finder modules matched
    core debug: art not found for asf.sdp
    core debug: looking for meta fetcher module matching "any": 1 candidates
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\fetcher
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\fetcher\tvrage.luac
    core debug: using meta fetcher module "lua"
    core debug: removing module "lua"
    core debug: searching art for file.sdp
    core debug: looking for art finder module matching "any": 2 candidates
    lua debug: Trying Lua scripts in C:\Users\Sezer\AppData\Roaming\vlc\lua\meta\art
    lua debug: Trying Lua scripts in C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\00_musicbrainz.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\01_googleimage.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\02_frenchtv.luac
    lua debug: Trying Lua playlist script C:\Program Files (x86)\VideoLAN\VLC\lua\meta\art\03_lastfm.luac
    core debug: no art finder modules matched
    core debug: art not found for file.sdp

    Can you lead me to the right direction ? What should I do to get fair quality and no lag using rtp ?