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  • encode h264 video using ffmpeg library memory issues

    31 mars 2015, par Zeppa

    I’m trying to do screen capture on OS X using ffmpeg’s avfoundation library. I capture frames from the screen and encode it using H264 into an flv container.

    Here’s the command line output of the program :

    Input #0, avfoundation, from 'Capture screen 0':
    
  Duration: N/A, start: 9.253649, bitrate: N/A
    
    Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 1440x900, 14.58 tbr, 1000k tbn, 1000k tbc
    
raw video is inCodec
    
FLV (Flash Video)http://localhost:8090/test.flv
    
[libx264 @ 0x102038e00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x102038e00] profile High, level 4.0
    
[libx264 @ 0x102038e00] 264 - core 142 r2495 6a301b6 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=1 weightp=2 keyint=50 keyint_min=5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
[tcp @ 0x101a5fe70] Connection to tcp://localhost:8090 failed (Connection refused), trying next address
    
[tcp @ 0x101a5fe70] Connection to tcp://localhost:8090 failed: Connection refused
    
url_fopen failed: Operation now in progress
    
[flv @ 0x102038800] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
    
encoded frame #0
    
encoded frame #1
    
......
    
encoded frame #49
    
encoded frame #50
    
testmee(8404,0x7fff7e05c300) malloc: *** error for object 0x102053e08: incorrect checksum for freed object - object was probably modified after being freed.
    
*** set a breakpoint in malloc_error_break to debug
    
(lldb) bt
    
* thread #10: tid = 0x43873, 0x00007fff95639286 libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGABRT
    
  * frame #0: 0x00007fff95639286 libsystem_kernel.dylib`__pthread_kill + 10
    
    frame #1: 0x00007fff9623742f libsystem_pthread.dylib`pthread_kill + 90
    
    frame #2: 0x00007fff977ceb53 libsystem_c.dylib`abort + 129
    
    frame #3: 0x00007fff9ab59e06 libsystem_malloc.dylib`szone_error + 625
    
    frame #4: 0x00007fff9ab4f799 libsystem_malloc.dylib`small_malloc_from_free_list + 1105
    
    frame #5: 0x00007fff9ab4d3bc libsystem_malloc.dylib`szone_malloc_should_clear + 1449
    
    frame #6: 0x00007fff9ab4c877 libsystem_malloc.dylib`malloc_zone_malloc + 71
    
    frame #7: 0x00007fff9ab4b395 libsystem_malloc.dylib`malloc + 42
    
    frame #8: 0x00007fff94aa63d2 IOSurface`IOSurfaceClientLookupFromMachPort + 40
    
    frame #9: 0x00007fff94aa6b38 IOSurface`IOSurfaceLookupFromMachPort + 12
    
    frame #10: 0x00007fff92bfa6b2 CoreGraphics`_CGYDisplayStreamFrameAvailable + 342
    
    frame #11: 0x00007fff92f6759c CoreGraphics`CGYDisplayStreamNotification_server + 336
    
    frame #12: 0x00007fff92bfada6 CoreGraphics`display_stream_runloop_callout + 46
    
    frame #13: 0x00007fff956eba07 CoreFoundation`__CFMachPortPerform + 247
    
    frame #14: 0x00007fff956eb8f9 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
    
    frame #15: 0x00007fff956eb86b CoreFoundation`__CFRunLoopDoSource1 + 475
    
    frame #16: 0x00007fff956dd3e7 CoreFoundation`__CFRunLoopRun + 2375
    
    frame #17: 0x00007fff956dc858 CoreFoundation`CFRunLoopRunSpecific + 296
    
    frame #18: 0x00007fff95792ef1 CoreFoundation`CFRunLoopRun + 97
    
    frame #19: 0x0000000105f79ff1 CMIOUnits`___lldb_unnamed_function2148$$CMIOUnits + 875
    
    frame #20: 0x0000000105f6f2c2 CMIOUnits`___lldb_unnamed_function2127$$CMIOUnits + 14
    
    frame #21: 0x00007fff97051765 CoreMedia`figThreadMain + 417
    
    frame #22: 0x00007fff96235268 libsystem_pthread.dylib`_pthread_body + 131
    
    frame #23: 0x00007fff962351e5 libsystem_pthread.dylib`_pthread_start + 176
    
    frame #24: 0x00007fff9623341d libsystem_pthread.dylib`thread_start + 13

    I’ve attached the code I used below.

    #include <libavcodec></libavcodec>avcodec.h>
    
#include <libavformat></libavformat>avformat.h>
    
#include <libswscale></libswscale>swscale.h>
    
#include <libavdevice></libavdevice>avdevice.h>
    
#include <libavutil></libavutil>opt.h>
    
#include 
    
#include 
    
#include 
    
/* compile using
    
gcc -g -o stream test.c -lavformat -lavutil -lavcodec -lavdevice -lswscale
    
*/
    

    
// void show_av_device() {
    

    
//    inFmt->get_device_list(inFmtCtx, device_list);
    
//    printf("Device Info=============\n");
    
//    //avformat_open_input(&amp;inFmtCtx,"video=Capture screen 0",inFmt,&amp;inOptions);
    
//    printf("===============================\n");
    
// }
    

    
void AVFAIL (int code, const char *what) {
    
    char msg[500];
    
    av_strerror(code, msg, sizeof(msg));
    
    fprintf(stderr, "failed: %s\nerror: %s\n", what, msg);
    
    exit(2);
    
}
    

    
#define AVCHECK(f) do { int e = (f); if (e &lt; 0) AVFAIL(e, #f); } while (0)
    
#define AVCHECKPTR(p,f) do { p = (f); if (!p) AVFAIL(AVERROR_UNKNOWN, #f); } while (0)
    

    
void registerLibs() {
    
    av_register_all();
    
    avdevice_register_all();
    
    avformat_network_init();
    
    avcodec_register_all();
    
}
    

    
int main(int argc, char *argv[]) {
    

    
    //conversion variables
    
    struct SwsContext *swsCtx = NULL;
    
    //input stream variables
    
    AVFormatContext   *inFmtCtx = NULL;
    
    AVCodecContext    *inCodecCtx = NULL;
    
    AVCodec           *inCodec = NULL;
    
    AVInputFormat     *inFmt = NULL;
    
    AVFrame           *inFrame = NULL;
    
    AVDictionary      *inOptions = NULL;
    
    const char *streamURL = "http://localhost:8090/test.flv";
    
    const char *name = "avfoundation";
    

    
//    AVFrame           *inFrameYUV = NULL;
    
    AVPacket          inPacket;
    

    

    
    //output stream variables
    
    AVCodecContext    *outCodecCtx = NULL;
    
    AVCodec           *outCodec;
    
    AVFormatContext   *outFmtCtx = NULL;
    
    AVOutputFormat    *outFmt = NULL;
    
    AVFrame           *outFrameYUV = NULL;
    
    AVStream          *stream = NULL;
    

    
    int               i, videostream, ret;
    
    int               numBytes, frameFinished;
    

    
    registerLibs();
    
    inFmtCtx = avformat_alloc_context(); //alloc input context
    
    av_dict_set(&amp;inOptions, "pixel_format", "uyvy422", 0);
    
    av_dict_set(&amp;inOptions, "probesize", "7000000", 0);
    

    
    inFmt = av_find_input_format(name);
    
    ret = avformat_open_input(&amp;inFmtCtx, "Capture screen 0:", inFmt, &amp;inOptions);
    
    if (ret &lt; 0) {
    
        printf("Could not load the context for the input device\n");
    
        return -1;
    
    }
    
    if (avformat_find_stream_info(inFmtCtx, NULL) &lt; 0) {
    
        printf("Could not find stream info for screen\n");
    
        return -1;
    
    }
    
    av_dump_format(inFmtCtx, 0, "Capture screen 0", 0);
    
    // inFmtCtx->streams is an array of pointers of size inFmtCtx->nb_stream
    

    
    videostream = av_find_best_stream(inFmtCtx, AVMEDIA_TYPE_VIDEO, -1, -1, &amp;inCodec, 0);
    
    if (videostream == -1) {
    
        printf("no video stream found\n");
    
        return -1;
    
    } else {
    
        printf("%s is inCodec\n", inCodec->long_name);
    
    }
    
    inCodecCtx = inFmtCtx->streams[videostream]->codec;
    
    // open codec
    
    if (avcodec_open2(inCodecCtx, inCodec, NULL) > 0) {
    
        printf("Couldn't open codec");
    
        return -1;  // couldn't open codec
    
    }
    

    

    
        //setup output params
    
    outFmt = av_guess_format(NULL, streamURL, NULL);
    
    if(outFmt == NULL) {
    
        printf("output format was not guessed properly");
    
        return -1;
    
    }
    

    
    if((outFmtCtx = avformat_alloc_context()) &lt; 0) {
    
        printf("output context not allocated. ERROR");
    
        return -1;
    
    }
    

    
    printf("%s", outFmt->long_name);
    

    
    outFmtCtx->oformat = outFmt;
    

    
    snprintf(outFmtCtx->filename, sizeof(outFmtCtx->filename), streamURL);
    
    printf("%s\n", outFmtCtx->filename);
    

    
    outCodec = avcodec_find_encoder(AV_CODEC_ID_H264);
    
    if(!outCodec) {
    
        printf("could not find encoder for H264 \n" );
    
        return -1;
    
    }
    

    
    stream = avformat_new_stream(outFmtCtx, outCodec);
    
    outCodecCtx = stream->codec;
    
    avcodec_get_context_defaults3(outCodecCtx, outCodec);
    

    
    outCodecCtx->codec_id = AV_CODEC_ID_H264;
    
    outCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
    
    outCodecCtx->flags = CODEC_FLAG_GLOBAL_HEADER;
    
    outCodecCtx->width = inCodecCtx->width;
    
    outCodecCtx->height = inCodecCtx->height;
    
    outCodecCtx->time_base.den = 25;
    
    outCodecCtx->time_base.num = 1;
    
    outCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
    
    outCodecCtx->gop_size = 50;
    
    outCodecCtx->bit_rate = 400000;
    

    
    //setup output encoders etc
    
    if(stream) {
    
        ret = avcodec_open2(outCodecCtx, outCodec, NULL);
    
        if (ret &lt; 0) {
    
            printf("Could not open output encoder");
    
            return -1;
    
        }
    
    }
    

    
    if (avio_open(&amp;outFmtCtx->pb, outFmtCtx->filename, AVIO_FLAG_WRITE ) &lt; 0) {
    
        perror("url_fopen failed");
    
    }
    

    
    avio_open_dyn_buf(&amp;outFmtCtx->pb);
    
    ret = avformat_write_header(outFmtCtx, NULL);
    
    if (ret != 0) {
    
        printf("was not able to write header to output format");
    
        return -1;
    
    }
    
    unsigned char *pb_buffer;
    
    int len = avio_close_dyn_buf(outFmtCtx->pb, (unsigned char **)(&amp;pb_buffer));
    
    avio_write(outFmtCtx->pb, (unsigned char *)pb_buffer, len);
    

    

    
    numBytes = avpicture_get_size(PIX_FMT_UYVY422, inCodecCtx->width, inCodecCtx->height);
    
    // Allocate video frame
    
    inFrame = av_frame_alloc();
    

    
    swsCtx = sws_getContext(inCodecCtx->width, inCodecCtx->height, inCodecCtx->pix_fmt, inCodecCtx->width,
    
                            inCodecCtx->height, PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL);
    
    int frame_count = 0;
    
    while(av_read_frame(inFmtCtx, &amp;inPacket) >= 0) {
    
        if(inPacket.stream_index == videostream) {
    
            avcodec_decode_video2(inCodecCtx, inFrame, &amp;frameFinished, &amp;inPacket);
    
            // 1 Frame might need more than 1 packet to be filled
    
            if(frameFinished) {
    
                outFrameYUV = av_frame_alloc();
    

    
                uint8_t *buffer = (uint8_t *)av_malloc(numBytes);
    

    
                int ret = avpicture_fill((AVPicture *)outFrameYUV, buffer, PIX_FMT_YUV420P,
    
                                         inCodecCtx->width, inCodecCtx->height);
    
                if(ret &lt; 0){
    
                    printf("%d is return val for fill\n", ret);
    
                    return -1;
    
                }
    
                //convert image to YUV
    
                sws_scale(swsCtx, (uint8_t const * const* )inFrame->data,
    
                          inFrame->linesize, 0, inCodecCtx->height,
    
                          outFrameYUV->data, outFrameYUV->linesize);
    
                //outFrameYUV now holds the YUV scaled frame/picture
    
                outFrameYUV->format = outCodecCtx->pix_fmt;
    
                outFrameYUV->width = outCodecCtx->width;
    
                outFrameYUV->height = outCodecCtx->height;
    

    

    
                AVPacket pkt;
    
                int got_output;
    
                av_init_packet(&amp;pkt);
    
                pkt.data = NULL;
    
                pkt.size = 0;
    

    
                outFrameYUV->pts = frame_count;
    

    
                ret = avcodec_encode_video2(outCodecCtx, &amp;pkt, outFrameYUV, &amp;got_output);
    
                if (ret &lt; 0) {
    
                    fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
    
                    return -1;
    
                }
    

    
                if(got_output) {
    
                    if(stream->codec->coded_frame->key_frame) {
    
                        pkt.flags |= AV_PKT_FLAG_KEY;
    
                    }
    
                    pkt.stream_index = stream->index;
    
                    if(pkt.pts != AV_NOPTS_VALUE)
    
                        pkt.pts = av_rescale_q(pkt.pts, stream->codec->time_base, stream->time_base);
    
                    if(pkt.dts != AV_NOPTS_VALUE)
    
                        pkt.dts = av_rescale_q(pkt.dts, stream->codec->time_base, stream->time_base);
    
                    if(avio_open_dyn_buf(&amp;outFmtCtx->pb)!= 0) {
    
                        printf("ERROR: Unable to open dynamic buffer\n");
    
                    }
    
                    ret = av_interleaved_write_frame(outFmtCtx, &amp;pkt);
    
                    unsigned char *pb_buffer;
    
                    int len = avio_close_dyn_buf(outFmtCtx->pb, (unsigned char **)&amp;pb_buffer);
    
                    avio_write(outFmtCtx->pb, (unsigned char *)pb_buffer, len);
    

    
                } else {
    
                    ret = 0;
    
                }
    
                if(ret != 0) {
    
                    fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret));
    
                    exit(1);
    
                }
    

    
                fprintf(stderr, "encoded frame #%d\n", frame_count);
    
                frame_count++;
    

    
                av_free_packet(&amp;pkt);
    
                av_frame_free(&amp;outFrameYUV);
    
                av_free(buffer);
    

    
            }
    
        }
    
        av_free_packet(&amp;inPacket);
    
    }
    
    av_write_trailer(outFmtCtx);
    

    
    //close video stream
    
    if(stream) {
    
        avcodec_close(outCodecCtx);
    
    }
    
    for (i = 0; i &lt; outFmtCtx->nb_streams; i++) {
    
        av_freep(&amp;outFmtCtx->streams[i]->codec);
    
        av_freep(&amp;outFmtCtx->streams[i]);
    
    }
    
    if (!(outFmt->flags &amp; AVFMT_NOFILE))
    
    /* Close the output file. */
    
        avio_close(outFmtCtx->pb);
    
    /* free the output format context */
    
    avformat_free_context(outFmtCtx);
    

    
    // Free the YUV frame populated by the decoder
    
    av_free(inFrame);
    

    
    // Close the video codec (decoder)
    
    avcodec_close(inCodecCtx);
    

    
    // Close the input video file
    
    avformat_close_input(&amp;inFmtCtx);
    

    
    return 1;
    

    
}

    I’m not sure what I’ve done wrong here. But, what I’ve observed is that for each frame thats been encoded, my memory usage goes up by about 6MB. Backtracking afterward usually leads one of the following two culprits :

    1. avf_read_frame function in avfoundation.m
    2. av_dup_packet function in avpacket.h

    Can I also get advice on the way I’m using avio_open_dyn_buff function to be able to stream over http? I’ve also attached my ffmpeg library versions below :

        ffmpeg version N-70876-g294bb6c Copyright (c) 2000-2015 the FFmpeg developers
    
  built with Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
    
  configuration: --prefix=/usr/local --enable-gpl --enable-postproc --enable-pthreads --enable-libmp3lame --enable-libtheora --enable-libx264 --enable-libvorbis --disable-mmx --disable-ssse3 --disable-armv5te --disable-armv6 --disable-neon --enable-shared --disable-static --disable-stripping
    
  libavutil      54. 20.100 / 54. 20.100
    
  libavcodec     56. 29.100 / 56. 29.100
    
  libavformat    56. 26.101 / 56. 26.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 13.101 /  5. 13.101
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Hyper fast Audio and Video encoder

    Valgrind analysis attached here because I exceeded stack overflow’s character limit. http://pastebin.com/MPeRhjhN

  • Muxing together a .ts file and a sub file causes playback issues in video and audio [closed]

    3 mai 2024, par Meta83

    So I have a .ts file and a converted .dvb sub file (.SRT TO .DVB) that I want to mux togheter using FFMPEG. The mux is a success and the file plays fine in VLC or other modern divce.However I have an older divce (around 10 yeras old) where playback has issues, whenever a line of subs is displayd the picture and and audio gets corrupted and frezzes up and as sson there are no lins everything looks good again and so on. Note that subs are displayd correctly and they are not affected by the issue, only picture and audio is.

    &#xA;

    I have tried using diffrent command without any luck but here is the most basic command that should work :

    &#xA;

    ffmpeg -i <video file="file"> -i <dvb file="file"> -f mpegts -c:v copy -c:a copy -c:s copy -copyts <output file="file">&#xA;</output></dvb></video>

    &#xA;

    Here is the output I get frome FFMPEG :

    &#xA;

    ffmpeg version 7.0-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers&#xA;  built with gcc 13.2.0 (Rev5, Built by MSYS2 project)&#xA;  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint&#xA;  libavutil      59.  8.100 / 59.  8.100&#xA;  libavcodec     61.  3.100 / 61.  3.100&#xA;  libavformat    61.  1.100 / 61.  1.100&#xA;  libavdevice    61.  1.100 / 61.  1.100&#xA;  libavfilter    10.  1.100 / 10.  1.100&#xA;  libswscale      8.  1.100 /  8.  1.100&#xA;  libswresample   5.  1.100 /  5.  1.100&#xA;  libpostproc    58.  1.100 / 58.  1.100&#xA;[mpegts @ 0000029209341000] stream 0 : no PTS found at end of file, duration not set&#xA;Input #0, mpegts, from &#x27;\Tests\video.ts&#x27;:&#xA;  Duration: 00:28:52.06, start: 0.980000, bitrate: 4992 kb/s&#xA;  Program 1&#xA;  Stream #0:0[0x1e1]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn&#xA;  Stream #0:1[0x1e2](swe): Audio: mp2 (mp3float) ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 192 kb/s&#xA;Input #1, mpegts, from &#x27;ENG.dvb&#x27;:&#xA;  Duration: 00:28:09.88, start: 0.160000, bitrate: 8 kb/s&#xA;  Program 1&#xA;    Metadata:&#xA;      service_name    : Service01&#xA;      service_provider: FFmpeg&#xA;  Stream #1:0[0x100](eng): Subtitle: dvb_subtitle (dvbsub) ([6][0][0][0] / 0x0006)&#xA;Stream mapping:&#xA;  Stream #0:0 -> #0:0 (copy)&#xA;  Stream #0:1 -> #0:1 (copy)&#xA;  Stream #1:0 -> #0:2 (copy)&#xA;Output #0, mpegts, to &#x27;\Tests\20735799_muxed.ts&#x27;:&#xA;  Metadata:&#xA;    encoder         : Lavf61.1.100&#xA;  Stream #0:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 25 tbr, 90k tbn&#xA;  Stream #0:1(swe): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 192 kb/s&#xA;  Stream #0:2(swe): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)&#xA;Press [q] to stop, [?] for help&#xA;[out#0/mpegts @ 000002920a155380] video:951379KiB audio:40595KiB subtitle:1389KiB other streams:0KiB global headers:0KiB muxing overhead: 3.385295%&#xA;size= 1026992KiB time=00:27:25.74 bitrate=5112.1kbits/s speed=75.3x&#xA;

    &#xA;

    Can anyone help me out ? I'm I missing something that is needed for older divaces (divece in question is a Samsung SMT-S5140 STB).

    &#xA;

  • ffmpeg issues "501 Not Implemented" while recording an RTSP stream

    28 février 2019, par atsushi

    I have a 4K camera (Sony SNC-VB770) streaming RTSP.

    I’m trying to record the stream into files (each has handy length, say, 1hour)
    using a simple script to repeatedly launch ffmpeg (ver 4.1) :

    while : ; do
    
  # (set $url and $outfile, and then)
    
  ffmpeg -rtsp_transport tcp -t 3600 -y -i $url -c copy -map 0:0 -b:v 16000k $outfile
    
done

    If I run the script on a local PC directly connected to the camera, it works (longer than a week, at least).
    However, if I do the same on a server machine located in a data center, it fails randomly with no error message.
    Sometimes it runs for a few days, sometimes it dies in one minutes.

    Typical output looks like the following :

    # devname: snc-vb770
    
# url: rtsp://10.40.35.90/media/video1
    
# vb: 16000k
    
# datefmt %d%H
    
# addtimestamp 0
    
no timestamp
    
ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-18)
    
  configuration: --prefix=/usr/local/ffmpeg-4.1 --enable-openssl --enable-gpl --enable-version3 --enable-nonfree --enable-shared --enable-libx264 --enable-libvorbis --enable-filter=drawtext --enable-libfreetype --enable-libfribidi --enable-fontconfig
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100
    
Input #0, rtsp, from 'rtsp://10.40.35.90/media/video1':
    
  Metadata:
    
    title           : Sony RTSP Server
    
  Duration: N/A, start: 0.066667, bitrate: N/A
    
    Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], 14.99 fps, 14.99 tbr, 90k tbn, 29.97 tbc
    
Output #0, mp4, to './2811.mp4':
    
  Metadata:
    
    title           : Sony RTSP Server
    
    encoder         : Lavf58.20.100
    
    Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 16000 kb/s, 14.99 fps, 14.99 tbr, 90k tbn, 90k tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
Press [q] to stop, [?] for help
    
[mp4 @ 0x24e4ec0] 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 @ 0x24e4ec0] pts has no value
    
[mp4 @ 0x24e4ec0] 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.
    
frame=   33 fps=0.0 q=-1.0 size=    1792kB time=00:00:02.00 bitrate=7332.9kbits/s speed=3.57x
    
...
    
frame=  104 fps=8.4 q=-1.0 Lsize=    6532kB time=00:00:06.74 bitrate=7939.6kbits/s speed=0.548x
    
video:6531kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.023506%

    I’ve looked into RTSP packet and found an "RTSP/1.0 501 Not Implemented" is sent from ffmpeg to the camera.
    After that the camera eventually sent back "RTSP/1.0 505 RTSP Version not supported" and then ffmpeg quits shortly.

    The "501" packet seems to be generated by libavformat/rtsp.c:ff_rtsp_read_reply(),
    when ffmpeg receive a malformed RTSP packet with method=(null), status_code=0.
    I don’t know why such packets arrive at random timing and who is wrong (maybe the camera, maybe any of network switches or routers in the middle of the network path from the camera to the server machine).
    But anyway, I don’t want the recording to be stopped
    due to those malformed packets.

    Is there any workaround to make ffmpeg ignore invalid RTSP packets and just continue the recording ?

    Additional information :

    • I’ve tested the recording with both ffmpeg ver4.1 and 2.8.4 and no difference observed.

    • No difference observed at lower resolution nor at lower bitrate.

    • I have 3 cameras from various manufacturers in the same network environment.
      All of the three are working without problem for more than a month.
      Only the Sony SNC-VB770 shows the strange behavior.

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