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• Ffmpeg : How to fix error "Please choose an encoder manually" ?

  9 juillet 2023, par Alex

  I am trying to convert a x265 videofile to a x264 format so it can be played on a television. I am trying the following command

  


  ffmpeg -i input.mkv -f mp4 -vcodec libx264 -preset fast -profile:v main -acodec aac -map 0:0 -map 0:1 -map 0:2 test.mp4


  


  to select videos stream 0:0 for video, stream 0:1 for audio and stream 0:2 for the subtitle. However I get an error

  


  Automatic encoder selection failed Default encoder for format mp4 (codec none) is probably disabled. Please choose an encoder manually.
Error selecting an encoder


  


  How to fix this command ?

  


  P.S. I am not an expert in ffmpeg or videos conversion/formats/encodings/audio formats/subtitle formats.

  


  I found EXACTLY ONE google search result with the exact error phrase HERE. And that is not helping as I do not even understand the first sentence.

  


  Below is the output for the first three streams :

  


  Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    creation_time   : 2021-03-25T09:13:20.000000Z
    ENCODER         : Lavf58.29.100
  Duration: 00:23:57.65, start: 0.000000, bitrate: 2103 kb/s
  Stream #0:0(jpn): Video: hevc (Main 10), yuv420p10le(tv), 1920x1080, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata:
      title           : [Judas] x265 10b
      ENCODER         : Lavc58.54.100 libx265
      BPS-eng         : 1973938
      DURATION-eng    : 00:23:55.017000000
      NUMBER_OF_FRAMES-eng: 34406
      NUMBER_OF_BYTES-eng: 354079423
      _STATISTICS_WRITING_APP-eng: mkvmerge v48.0.0 ('Fortress Around Your Heart') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-03-25 09:13:20
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1(jpn): Audio: aac (LC), 44100 Hz, stereo, fltp (default)
    Metadata:
      title           : Japanese
      BPS-eng         : 128000
      DURATION-eng    : 00:23:55.086000000
      NUMBER_OF_FRAMES-eng: 61804
      NUMBER_OF_BYTES-eng: 22961378
      _STATISTICS_WRITING_APP-eng: mkvmerge v48.0.0 ('Fortress Around Your Heart') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-03-25 09:13:20
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:2(eng): Subtitle: ass
    Metadata:
      title           : English
      BPS-eng         : 196
      DURATION-eng    : 00:23:53.580000000
      NUMBER_OF_FRAMES-eng: 478
      NUMBER_OF_BYTES-eng: 35129
      _STATISTICS_WRITING_APP-eng: mkvmerge v48.0.0 ('Fortress Around Your Heart') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-03-25 09:13:20
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES


  


  I found a related question HERE whose answer I do not fully understand. However, I tried the following command

  


  ffmpeg -i input.mkv -f mp4 -vcodec libx264 -preset fast -profile:v main -acodec aac -map 0:0 -map 0:1 -map 0:2 -c:s mov_text  test.mp4


  


  but got a new error

  


  Error initializing output stream: Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


  


  I thought I am defining an "encoder" for output stream "#0:0" (which I think is video), namely libx264. So what else to do here ?

  


  I tried -acode copy and also to use -qp 0 in the command line which all did not work.

  


• avcodec_open2 returns -22 "Invalid argument" trying to encode AV_CODEC_ID_H264

  26 mai 2023, par Fries of Doom

  I'm trying to use libavcodec to encode h264 video but avcodec_open2 returns -22 "Invalid argument" and I can't figure out why. Here is my code, which is mostly a copy from the encode example from libavcodec.

  


      /* find the mpeg1video encoder */
    const AVCodec* codec = avcodec_find_encoder(AV_CODEC_ID_H264);
    if (!codec) {
        fprintf(stderr, "Codec '%s' not found\n", "h.264");
        exit(1);
    }

    AVCodecContext* codecContext = avcodec_alloc_context3(codec);
    if (!codecContext) {
        fprintf(stderr, "Could not allocate video codec context\n");
        exit(1);
    }

    AVPacket* pkt = av_packet_alloc();
    if (!pkt)
        exit(1);

    /* put sample parameters */
    codecContext->bit_rate = 400000;
    /* resolution must be a multiple of two */
    codecContext->width = 1920;
    codecContext->height = 1080;
    /* frames per second */
    codecContext->time_base = { 1, 25 };
    codecContext->framerate = { 25, 1 };

    /* emit one intra frame every ten frames
     * check frame pict_type before passing frame
     * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
     * then gop_size is ignored and the output of encoder
     * will always be I frame irrespective to gop_size
     */
    codecContext->gop_size = 10;
    codecContext->max_b_frames = 1;
    codecContext->codec_type = AVMEDIA_TYPE_VIDEO;
    codecContext->pix_fmt = AV_PIX_FMT_YUV420P;

    if (codec->id == AV_CODEC_ID_H264)
        av_opt_set(codecContext->priv_data, "profile", "baseline", 0);

    /* open it */
    int ret = avcodec_open2(codecContext, codec, nullptr);
    if (ret < 0) {
        char eb[AV_ERROR_MAX_STRING_SIZE];
        fprintf(stderr, "Could not open codec: %s\n", av_make_error_string(eb, AV_ERROR_MAX_STRING_SIZE, ret));
        exit(1);
    }


  


  Does anyone know what I'm doing wrong ?

  


• mp4 video not playing on ios mobile or firefox, but work fine in chrome and safari

  25 janvier 2023, par mavicll

  The mp4 video is hosted on s3 and cloudfront, with the following media info. Link here.

  


  General
Complete name                            : tkfinder.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 14.9 MiB
Duration                                 : 41 s 867 ms
Overall bit rate                         : 2 990 kb/s
Writing application                      : Lavf58.76.100

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L5.2
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 41 s 867 ms
Bit rate                                 : 2 984 kb/s
Width                                    : 2 924 pixels
Height                                   : 1 672 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 60.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.010
Stream size                              : 14.9 MiB (100%)
Title                                    : Core Media Video
Writing library                          : x264 core 163
Encoding settings                        : 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=24 / lookahead_threads=4 / 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
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Codec configuration box                  : avcC


  


  Problem : mp4 video not playing on firefox or ios mobile, but work fine in chrome and safari.

  


  

  


  Is any thing issues on format or encoding setting or on S3 setting ?