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Autres articles (46)

La file d’attente de SPIPmotion

28 novembre 2010, par kent1

Une file d’attente stockée dans la base de donnée
Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)
Submit bugs and patches

13 avril 2011

Unfortunately a software is never perfect.
If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
You may also (...)
Contribute to documentation

13 avril 2011

Documentation is vital to the development of improved technical capabilities.
MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
To contribute, register to the project users’ mailing (...)

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ... | 16

Sur d’autres sites (7608)

Errors while Audio decoding ?

13 avril 2015, par Kuldeep More

Hi all I am decoding audio streaming using FFMPEG API and writing into the .pcm file , but while decoding audio I am getting following errors .
Also I am using Live555 to receive audio encoded streaming.

Please tell me what is going wrong in the following code.

I am calling following function for initializing purpose.

       AVCodec *acodec;

       AVCodecContext *ac=NULL;

       AVCodecParserContext *parser = NULL;

       AVFrame *picture;

       AVPacket avpkt;







  int initFFMpeg(RTSPClient* rtspClient)

  {  

      avcodec_register_all();

      av_init_packet(&amp;avpkt);

      acodec = avcodec_find_decoder(AV_CODEC_ID_AAC);

      if (!acodec)

      {

        fprintf(stderr, "acodec not found audio codec\n");

        exit(1);

        return 0;

      }

      ac=avcodec_alloc_context3(acodec);

      picture = avcodec_alloc_frame();

      ac->skip_loop_filter=AVDISCARD_ALL;

      ac->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;

      ac->codec_type = AVMEDIA_TYPE_AUDIO;

      ac->channels = 2; 

      ac->sample_fmt = AV_SAMPLE_FMT_S16; // AV_SAMPLE_FMT_S16

      ac->sample_rate = 44100; // 44100

      ac->channel_layout = 3; // 3

      const AVRational timeBase = {1, ac->sample_rate};

      ac->time_base = timeBase;



      if (avcodec_open2(ac,acodec,NULL) &lt; 0)

      {

        fprintf(stderr, "could not open codec\n");

        exit(1);

      }

  }

And for decoding audio I am calling following function.

 void decodeaudioframe(unsigned char *fbuffer,int frameSize)

 {



  int len,out_size;

  unsigned char *buffer = new unsigned char[frameSize];

  memcpy(buffer, fbuffer, frameSize);

  uint8_t* in = buffer;

  int size = frameSize;



  while(size > 0)

  {

    avpkt.data =in;

    avpkt.size = size;



    len = avcodec_decode_audio4(ac, picture,&amp;out_size,&amp;avpkt);



    if (len &lt; 0)

     {

         fprintf(stderr, "Error while decoding audio frame %d\n", aframe);

          break;

     }

     if(out_size)

     {

         fprintf(stderr, "Audio decoding audio success frame no= %d\n", aframe);

         printf("channels %d",picture->channels);

         printf("Sample rate=%d",picture->sample_rate);

         fwrite(picture,1,frameSize,faudio);





     }



     size -= len;

     in += len;

     ++aframe;

 }



  delete []buffer;

 }

Following errors are coming when I run this code.

   [URL:"rtsp://admin:12345@192.168.3.170:554/stream1/"]: Started playing session...

  Audio decoding audio success frame no= 0

  [aac @ 0xae574e0] Input buffer exhausted before END element found

  Error while decoding audio frame 1

  [aac @ 0xae574e0] Number of scalefactor bands in group (50) exceeds limit (49).

  Error while decoding audio frame 1

  [aac @ 0xae574e0] Input buffer exhausted before END element found

  Error while decoding audio frame 1

  Audio decoding audio success frame no= 1

  [aac @ 0xae574e0] Input buffer exhausted before END element found

  Error while decoding audio frame 2

  [aac @ 0xae574e0] Input buffer exhausted before END element found

  Error while decoding audio frame 2

  Audio decoding audio success frame no= 2

  [aac @ 0xae574e0] Input buffer exhausted before END element found

  Error while decoding audio frame 3

  [aac @ 0xae574e0] Number of scalefactor bands in group (50) exceeds limit (49).

  Error while decoding audio frame 3

  [aac @ 0xae574e0] Number of scalefactor bands in group (50) exceeds limit (49).

  Error while decoding audio frame 3

  Audio decoding audio success frame no= 3

  [aac @ 0xae574e0] Input buffer exhausted before END element found

  Error while decoding audio frame 4

  [aac @ 0xae574e0] Input buffer exhausted before END element found

  Error while decoding audio frame 4

  Audio decoding audio success frame no= 4

  [aac @ 0xae574e0] Input buffer exhausted before END element found

Trying to concatenate multiple videos with multiple audio streams using ffmpeg

25 avril 2019, par Toto

I’m trying to concatenate 3 mp4 videos, each contains 3 audio streams using ffmpeg, since I couldn’t merge them with other software because of differences in the codecs private data.

Since the files have different codecs I’m trying to use the concat video filter but I can’t seem to get it to work. The output turns out to be an unplayable file. I’m trying to specify the input files, and every media stream, then telling the software to concatenate it and copy it to the output file.

ffmpeg -i A.mp4 -i B.mp4 -i C.mp4 -filter_complex  '[0:0] [0:1] [0:2] [0:3] [1:0] [1:1] [1:2] [1:3] [2:0] [2:1] [2:2] [2:3] concat=n=3:v=1:a=3 [v] [a1] [a2] [a3]'  -map '[v]' -map '[a1]' -map '[a2]'-map '[a3]' output.mp4

The complete log :

ffmpeg -i A.mp4 -i B.mp4 -i C.mp4 -filter_complex  '[0:0] [0:1] [0:2] [0:3] [1:0] [1:1] [1:2] [1:3] [2:0] [2:1] [2:2] [2:3] concat=n=3:v=1:a=3 [v] [a1] [a2] [a3]'  -map '[v]' -map '[a1]' -map '[a2]'-map '[a3]' output.mp4

ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers

  built with gcc 8.2.1 (GCC) 20190212

  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth

  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, mov,mp4,m4a,3gp,3g2,mj2, from 'A.mp4':

  Metadata:

    major_brand     : mp42

    minor_version   : 512

    compatible_brands: isomiso2avc1mp41

    encoder         : HandBrake 0.10.1 2015030800

  Duration: 01:59:10.12, start: 0.000000, bitrate: 6868 kb/s

    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 6017 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)

    Metadata:

      handler_name    : VideoHandler

    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 320 kb/s (default)

    Metadata:

      handler_name    : Stereo

    Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 320 kb/s

    Metadata:

      handler_name    : Surround

    Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s

    Metadata:

      handler_name    : Stereo

Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'B.mp4':

  Metadata:

    major_brand     : mp42

    minor_version   : 512

    compatible_brands: isomiso2avc1mp41

    encoder         : HandBrake 0.10.1 2015030800

  Duration: 01:12:28.48, start: 0.000000, bitrate: 6846 kb/s

    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 6001 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)

    Metadata:

      handler_name    : VideoHandler

    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 320 kb/s (default)

    Metadata:

      handler_name    : Stereo

    Stream #1:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 320 kb/s

    Metadata:

      handler_name    : Surround

    Stream #1:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s

    Metadata:

      handler_name    : Stereo

Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'C.mp4':

  Metadata:

    major_brand     : mp42

    minor_version   : 512

    compatible_brands: isomiso2avc1mp41

    encoder         : HandBrake 0.10.1 2015030800

  Duration: 00:58:55.53, start: 0.000000, bitrate: 6850 kb/s

    Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 6005 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)

    Metadata:

      handler_name    : VideoHandler

    Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 319 kb/s (default)

    Metadata:

      handler_name    : Stereo

    Stream #2:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 319 kb/s

    Metadata:

      handler_name    : Surround

    Stream #2:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s

    Metadata:

      handler_name    : Stereo

Stream mapping:

  Stream #0:0 (h264) -> concat:in0:v0

  Stream #0:1 (aac) -> concat:in0:a0

  Stream #0:2 (aac) -> concat:in0:a1

  Stream #0:3 (aac) -> concat:in0:a2

  Stream #1:0 (h264) -> concat:in1:v0

  Stream #1:1 (aac) -> concat:in1:a0

  Stream #1:2 (aac) -> concat:in1:a1

  Stream #1:3 (aac) -> concat:in1:a2

  Stream #2:0 (h264) -> concat:in2:v0

  Stream #2:1 (aac) -> concat:in2:a0

  Stream #2:2 (aac) -> concat:in2:a1

  Stream #2:3 (aac) -> concat:in2:a2

  concat:out:v0 -> Stream #0:0 (libx264)

  concat:out:a0 -> Stream #0:1 (aac)

  concat:out:a1 -> Stream #0:2 (aac)

  concat:out:a2 -> Stream #0:3 (aac)

Press [q] to stop, [?] for help

[libx264 @ 000001930c898980] using SAR=1/1

[libx264 @ 000001930c898980] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX

[libx264 @ 000001930c898980] profile High, level 4.0, 4:2:0, 8-bit

[libx264 @ 000001930c898980] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=12 lookahead_threads=2 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

Output #0, mp4, to 'output.mp4':

  Metadata:

    major_brand     : mp42

    minor_version   : 512

    compatible_brands: isomiso2avc1mp41

    encoder         : Lavf58.20.100

    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)

    Metadata:

      encoder         : Lavc58.35.100 libx264

    Side data:

      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1

    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s

    Metadata:

      encoder         : Lavc58.35.100 aac

    Stream #0:2: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 341 kb/s

    Metadata:

      encoder         : Lavc58.35.100 aac

    Stream #0:3: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s

    Metadata:

      encoder         : Lavc58.35.100 aac

[aac @ 000001930d3a88c0] skip_data_stream_element: Input buffer exhausted before END element found

Error while decoding stream #0:1: Invalid data found when processing input

[aac @ 000001930c89a4c0] Number of bands (48) exceeds limit (47).ate=6048.4kbits/s dup=1 drop=0 speed=0.916x

Error while decoding stream #2:1: Invalid data found when processing input

frame=450571 fps= 28 q=-1.0 Lsize=11204203kB time=04:10:34.13 bitrate=6105.1kbits/s dup=1 drop=0 speed=0.939x

video:10071486kB audio:1099256kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.299544%

[libx264 @ 000001930c898980] frame I:4679  Avg QP:20.30  size:103274

[libx264 @ 000001930c898980] frame P:125629 Avg QP:22.82  size: 41052

[libx264 @ 000001930c898980] frame B:320263 Avg QP:25.08  size: 14590

[libx264 @ 000001930c898980] consecutive B-frames:  2.3%  6.0%  8.8% 83.0%

[libx264 @ 000001930c898980] mb I  I16..4: 16.4% 78.4%  5.2%

[libx264 @ 000001930c898980] mb P  I16..4:  7.0% 17.1%  1.1%  P16..4: 43.0%  9.7%  4.9%  0.0%  0.0%    skip:17.3%

[libx264 @ 000001930c898980] mb B  I16..4:  0.8%  1.7%  0.1%  B16..8: 39.4%  3.6%  0.7%  direct: 4.3%  skip:49.4%  L0:43.8% L1:50.2% BI: 6.0%

[libx264 @ 000001930c898980] 8x8 transform intra:68.6% inter:84.9%

[libx264 @ 000001930c898980] coded y,uvDC,uvAC intra: 40.3% 64.9% 17.2% inter: 12.9% 24.2% 0.4%

[libx264 @ 000001930c898980] i16 v,h,dc,p: 40% 22% 10% 28%

[libx264 @ 000001930c898980] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 15% 23%  5%  6%  7%  5%  6%  5%

[libx264 @ 000001930c898980] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 16% 16%  6%  9%  9%  7%  6%  5%

[libx264 @ 000001930c898980] i8c dc,h,v,p: 48% 20% 26%  6%

[libx264 @ 000001930c898980] Weighted P-Frames: Y:8.6% UV:6.4%

[libx264 @ 000001930c898980] ref P L0: 58.8% 12.5% 19.8%  8.4%  0.4%

[libx264 @ 000001930c898980] ref B L0: 88.5%  9.1%  2.4%

[libx264 @ 000001930c898980] ref B L1: 96.9%  3.1%

[libx264 @ 000001930c898980] kb/s:5487.92

[aac @ 000001930c899280] Qavg: 212.043

[aac @ 000001930d1cfbc0] Qavg: 211.329

[aac @ 000001930d1ce080] Qavg: 228.685

This is the output when trying the concat demuxer, which also produces an unplayable file.

ffmpeg -f concat -safe 0 -i mylist.txt -map 0 -c copy concat2.mp4

ffmpeg version 4.1.1 Copyright (c) 2000-2019 the FFmpeg developers

  built with gcc 8.2.1 (GCC) 20190212

  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth

  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

[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025ca95f2dc0] Auto-inserting h264_mp4toannexb bitstream filter

Input #0, concat, from 'mylist.txt':

  Duration: N/A, start: 0.000000, bitrate: 6850 kb/s

    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 6017 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc

    Metadata:

      handler_name    : VideoHandler

    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 320 kb/s

    Metadata:

      handler_name    : Stereo

    Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 320 kb/s

    Metadata:

      handler_name    : Surround

    Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s

    Metadata:

      handler_name    : Stereo

Output #0, mp4, to 'concat2.mp4':

  Metadata:

    encoder         : Lavf58.20.100

    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 6017 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc

    Metadata:

      handler_name    : VideoHandler

    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 320 kb/s

    Metadata:

      handler_name    : Stereo

    Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 320 kb/s

    Metadata:

      handler_name    : Surround

    Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s

    Metadata:

      handler_name    : Stereo

Stream mapping:

  Stream #0:0 -> #0:0 (copy)

  Stream #0:1 -> #0:1 (copy)

  Stream #0:2 -> #0:2 (copy)

  Stream #0:3 -> #0:3 (copy)

Press [q] to stop, [?] for help

[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025ca95f9480] Auto-inserting h264_mp4toannexb bitstream filter4x

[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025ca95f9480] Auto-inserting h264_mp4toannexb bitstream filter5x

frame=450570 fps=1251 q=-1.0 Lsize=12591157kB time=04:10:34.11 bitrate=6860.8kbits/s speed=41.7x

video:11029679kB audio:1527897kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.267411%

FFmpeg retrieve a specific program from TS file

8 mai 2017, par chang jc

I tried to retrieve a specific program from a TS file.
Said :

Input #0, mpegts, from 'DVB_T_good.ts':

  Duration: 00:00:48.04, start: 55045.888000, bitrate: 14521 kb/s

  Program 300 

    Metadata:

      service_name    : ?l?��}�TS�

      service_provider: ?l?��

    Stream #0:0[0xbb9]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 704x480 [SAR 10:11 DAR 4:3], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc

    Stream #0:1[0xbba]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s

    Stream #0:2[0xbbb]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s

  Program 301 

    Metadata:

      service_name    : ?l?��N��?S�

      service_provider: ?l?��

    Stream #0:3[0xbc3]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 704x480 [SAR 10:11 DAR 4:3], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc

    Stream #0:9[0xbc4]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s

    Stream #0:10[0xbc5]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s

  Program 302 

    Metadata:

      service_name    : ?l?��e��^S�

      service_provider: ?l?��

    Stream #0:5[0xbcd]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 704x480 [SAR 10:11 DAR 4:3], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc

    Stream #0:6[0xbce]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s

  Program 304 

    Metadata:

      service_name    : ?l?��S�pcS�

      service_provider: ?l?��

    Stream #0:4[0xbe1]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc

    Stream #0:7[0xbe2]: Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp

    Stream #0:8[0xbe3]: Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp

Then I tried to retrieve a specific program as :

ffmpeg -i INPUT -map 0:p:1344 OUTPUT

It succeeds greatly but the only thing I noticed is :

it seems to apply transcode (decode & encode again) to the output implicitely ?

ffmpeg version N-85693-g8de3458 Copyright (c) 2000-2017 the FFmpeg developers

  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609

  configuration: --prefix=/home/john/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/john/ffmpeg_build/include --extra-ldflags=-L/home/john/ffmpeg_build/lib --bindir=/home/john/bin --enable-gpl --enable-libfreetype --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --disable-ffplay --disable-ffserver --disable-doc --disable-libopus

  libavutil      55. 61.100 / 55. 61.100

  libavcodec     57. 93.100 / 57. 93.100

  libavformat    57. 72.101 / 57. 72.101

  libavdevice    57.  7.100 / 57.  7.100

  libavfilter     6. 87.100 /  6. 87.100

  libswscale      4.  7.101 /  4.  7.101

  libswresample   2.  8.100 /  2.  8.100

  libpostproc    54.  6.100 / 54.  6.100

[NULL @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[NULL @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[mpeg2video @ 0x33ea200] Invalid frame dimensions 0x0.

    Last message repeated 1 times

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[mpeg2video @ 0x33ea200] Invalid frame dimensions 0x0.

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

    Last message repeated 1 times

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33ea200] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33ea200] Invalid frame dimensions 0x0.

    Last message repeated 1 times

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

    Last message repeated 1 times

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33ea200] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33ea200] Invalid frame dimensions 0x0.

    Last message repeated 1 times

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

    Last message repeated 1 times

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] SPS unavailable in decode_picture_timing

[h264 @ 0x33eb3a0] non-existing PPS 0 referenced

[h264 @ 0x33eb3a0] decode_slice_header error

[h264 @ 0x33eb3a0] no frame!

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

    Last message repeated 1 times

[mpeg2video @ 0x33ea200] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

    Last message repeated 2 times

[mpeg2video @ 0x33ec540] Invalid frame dimensions 0x0.

[mpeg2video @ 0x33b7680] Invalid frame dimensions 0x0.

[mpegts @ 0x33af360] PES packet size mismatch

    Last message repeated 9 times

Input #0, mpegts, from 'DVB_T_good.ts':

  Duration: 00:00:48.04, start: 55045.888000, bitrate: 14521 kb/s

  Program 300 

    Metadata:

      service_name    : ?l?��}�TS�

      service_provider: ?l?��

    Stream #0:0[0xbb9]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 704x480 [SAR 10:11 DAR 4:3], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc

    Stream #0:1[0xbba]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s

    Stream #0:2[0xbbb]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s

  Program 301 

    Metadata:

      service_name    : ?l?��N��?S�

      service_provider: ?l?��

    Stream #0:3[0xbc3]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 704x480 [SAR 10:11 DAR 4:3], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc

    Stream #0:9[0xbc4]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s

    Stream #0:10[0xbc5]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s

  Program 302 

    Metadata:

      service_name    : ?l?��e��^S�

      service_provider: ?l?��

    Stream #0:5[0xbcd]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 704x480 [SAR 10:11 DAR 4:3], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc

    Stream #0:6[0xbce]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s

  Program 304 

    Metadata:

      service_name    : ?l?��S�pcS�

      service_provider: ?l?��

    Stream #0:4[0xbe1]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc

    Stream #0:7[0xbe2]: Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp

    Stream #0:8[0xbe3]: Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp

map 0:p:304

File '304_1800.ts' already exists. Overwrite ? [y/N] y

Stream mapping:

  Stream #0:4 -> #0:0 (h264 (native) -> mpeg2video (native))

  Stream #0:7 -> #0:1 (aac_latm (native) -> mp2 (native))

  Stream #0:8 -> #0:2 (aac_latm (native) -> mp2 (native))

Press [q] to stop, [?] for help

[h264 @ 0x33d6d20] mmco: unref short failure

    Last message repeated 1 times

[h264 @ 0x33d6d20] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one

[h264 @ 0x33d6d20] reference picture missing during reorder

[h264 @ 0x33d6d20] Missing reference picture, default is 65784

[h264 @ 0x33d6d20] reference picture missing during reorder

[h264 @ 0x33d6d20] Missing reference picture, default is 65785

Output #0, mpegts, to '304_1800.ts':

  Metadata:

    encoder         : Lavf57.72.101

    Stream #0:0: Video: mpeg2video (Main), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 29.97 fps, 90k tbn, 29.97 tbc

    Metadata:

      encoder         : Lavc57.93.100 mpeg2video

    Side data:

      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1

    Stream #0:1: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s

    Metadata:

      encoder         : Lavc57.93.100 mp2

    Stream #0:2: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s

    Metadata:

      encoder         : Lavc57.93.100 mp2

[h264 @ 0x33d6d20] mmco: unref short failureime=00:00:44.34 bitrate=3506.2kbits/s speed=1.43x    

    Last message repeated 1 times

[h264 @ 0x33d6d20] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one

[mpegts @ 0x33af360] PES packet size mismatch

[aac_latm @ 0x3587360] Number of bands (59) exceeds limit (45).

Error while decoding stream #0:7: Invalid data found when processing input

    Last message repeated 1 times

[h264 @ 0x33d6d20] mmco: unref short failure

    Last message repeated 1 times

[h264 @ 0x33d6d20] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one

[h264 @ 0x33d6d20] mmco: unref short failureime=00:00:45.05 bitrate=3491.2kbits/s speed=1.43x    

    Last message repeated 1 times

[h264 @ 0x33d6d20] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one

[h264 @ 0x33d6d20] mmco: unref short failure

    Last message repeated 1 times

[h264 @ 0x33d6d20] number of reference frames (0+5) exceeds max (4; probably corrupt input), discarding one

[mpegts @ 0x33af360] PES packet size mismatchme=00:00:47.74 bitrate=3470.1kbits/s speed=1.43x    

    Last message repeated 1 times

[h264 @ 0x33d6d20] error while decoding MB 97 35, bytestream -12

Error while decoding stream #0:7: Invalid data found when processing input

Error while decoding stream #0:8: Invalid data found when processing input

frame= 1404 fps= 42 q=31.0 Lsize=   20396kB time=00:00:47.88 bitrate=3489.5kbits/s speed=1.42x    

video:14144kB audio:4429kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.813825%

You could notice by following message :

Output #0, mpegts, to '304_1800.ts':

  Metadata:

    encoder         : Lavf57.72.101

    Stream #0:0: Video: mpeg2video (Main), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 29.97 fps, 90k tbn, 29.97 tbc

    Metadata:

      encoder         : Lavc57.93.100 mpeg2video

    Side data:

      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1

    Stream #0:1: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s

    Metadata:

      encoder         : Lavc57.93.100 mp2

    Stream #0:2: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s

    Metadata:

      encoder         : Lavc57.93.100 mp2

If so, could I avoid the transcoding by command ? Or it is a necessary ?
It it is a need, WHY ?

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