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• FFmpeg HLS streaming - Why the program date time of older segment changing when re-streaming after discontinuity

  9 novembre 2020, par Suriya Krish

  Following is the ffmpeg command to stream the data.

  


  ffmpeg -re -f avfoundation 
-framerate 30 -i 0 
-codec:v h264_videotoolbox -x264-params keyint=120:scenecut=0 
-codec:a copy -f hls 
-hls_list_size 60 
-hls_time 10 
-hls_flags delete_segments 
-hls_flags +append_list 
-hls_flags +discont_start 
-hls_flags +program_date_time 
-strftime 1 
-strftime_mkdir 1 
-hls_segment_filename 
'%Y%m%dT%H%M%S%z.ts' playlist.m3u8


  


  Following is the playlist.m3u8 content which generated for few seconds.

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-DISCONTINUITY
#EXT-X-DISCONTINUITY
#EXTINF:10.000000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:07:53.000+0530
20201109T220753+0530.ts
#EXTINF:10.000000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:08:03.000+0530
20201109T220803+0530.ts
#EXT-X-ENDLIST


  


  When the re-stream happens(in case of restarting the streaming service), the program date time of older segments(before #EXT-X-DISCONTINUITY) also get changed like below, which is unexpected.

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-DISCONTINUITY
#EXT-X-DISCONTINUITY
#EXTINF:10.000000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:12:50.633+0530
20201109T220753+0530.ts
#EXTINF:10.000000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:13:00.633+0530
20201109T220803+0530.ts
#EXT-X-DISCONTINUITY
#EXTINF:10.000000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:13:12.000+0530
20201109T221312+0530.ts
#EXTINF:5.400000,
#EXT-X-PROGRAM-DATE-TIME:2020-11-09T22:13:22.000+0530
20201109T221322+0530.ts
#EXT-X-ENDLIST


  


  Why the program date time of older segment should change ? Should we add any arguments in ffmpeg command to handle this ?

  


• ffmpeg : avcodec_open2 returns invalid argument

  26 octobre 2020, par roari

  I'm reusing the sample code from the developer 64-bit release of FFmpeg in my application to encode a video :

  


  AVCodec* pCodec_{nullptr};
AVCodecContext* pContext_{nullptr};

avcodec_register_all();
pCodec_ = avcodec_find_encoder(AV_CODEC_ID_MPEG2VIDEO);
if (!pCodec_) {}

pContext_ = avcodec_alloc_context3(pCodec_);
if (!pContext_) {}

pContext_->bit_rate = 400000;
pContext_->width = size.width();
pContext_->height = size.height();

pContext_->time_base.den = 1;
pContext_->time_base.num = fps;

pContext_->gop_size = 10;
pContext_->max_b_frames = 1;
pContext_->pix_fmt = AV_PIX_FMT_BGR0;

if (codec_id == AV_CODEC_ID_H264) {
    av_opt_set(pContext_->priv_data, "preset", "slow", 0);
}

int err = avcodec_open2(pContext_, pCodec_, nullptr);
if (err < 0) {}


  


  AVCodec* and AVCodecContext* look like they are allocated correctly. avcodec_open2 then returns invalid argument (-22).

  


  I use : Windows 10 64, VS2013 Compiler, Qt Creator IDE, ffmpeg(2016-05-12) 64bit.

  


  The sample I took the code from is decoding_encoding.c.

  


  Any ideas ?

  


• Using ffmpeg results in undesirable motion blur

  13 septembre 2020, par Oleg Yablokov

  I am trying to convert a video with the best quality possible. The problem is, no matter which command arguments I use, a motion blur appears (the first image is converted, the second is the original) :

  


  

  


  The ffprobe's output of the original video :

  


  ffmpeg version 4.2.2-1ubuntu1 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-3ubuntu1)
configuration: --prefix=/usr --extra-version=1ubuntu1 --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
Input #0, mpegts, from 'input.ts':
Duration: 00:00:30.24, start: 1.400000, bitrate: 26265 kb/s
Program 1
    Metadata:
    service_name    : Service01
    service_provider: FFmpeg
    Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x101](ita): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 448 kb/s (clean effects)


  


  I've tried different combinations of the following arguments :

  


  ffmpeg \
-i input.ts \
-c:v libx264 \
-preset veryslow \
-qp 0 \
-minrate 25165824 \
-b:v 25165824 \
-r 25 \
-s 1920x1080 \
-aspect 16:9 \
-g 25 \
-crf 7 \
output.ts


  


  None of these settings helped. Please, could you tell me how to remove this motion blur ?

  


  EDIT : to be more specific, I leave a link to a shorten video ( 10 seconds). If you manage to convert it to hls (h.264 & .m3u8) without motion blur and with preserving the overall quality, it will be equivalent to the answer.