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• ffmpeg : Set the language of an audio stream without touching other metadata

  7 octobre 2020, par amirvf

  I have a MP4 file with an audio stream set to English. I want to change the language of audio stream to French.
I use the following command :

  


  ffmpeg -i input.mp4 -map 0 -c: copy -metadata:s:v language=und -metadata:s:a:0 language=fre output.mp4


  


  The language of audio stream changes to French without any issues, however, the "Title" of language is lost.

  


  Initially the audio stream was like this :
  
Language : English
  
Title : AC3 5.1 Channels

  


  After changing the language to French it is like this :
  
Language : French
  
Title : empty

  


  How should I modify the command so it does not touch the other attributes such as "Title" ?

  


  Thanks

  


• Syncronising Video/audio with two different sources

  22 mai 2016, par Indy

  I have an issue with an very old film that I’m trying to recover. I have two source of the same film.

  Source 1 (from ffmeg -i) :

  Duration: 02:43:35.77, start: 0.000000, bitrate: 1342 kb/s
  
  Stream #0:0: Video: mpeg4 (Simple Profile) (DIVX / 0x58564944), yuv420p, 720x480 [SAR 1:1 DAR 3:2], 1200 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 30k tbc
  
  Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 kb/s

  Source 2 (from ffmeg -i) :

  Duration: 02:46:11.04, start: 0.000000, bitrate: 1625 kb/s
  
  Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1200x720 [SAR 1:1 DAR 5:3], 1431 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 191 kb/s (default)
  
  Metadata:
  
    creation_time   : 2014-06-22 12:06:22
  
    handler_name    : IsoMedia File Produced by Google, 5-11-2011

  What I would like is to take the audio from source 1 and video from source 2 and create a new file with them.

  I have tried changing the source 1 to 30 fps and then using its audio with source 2’s video but the audio ’fps’ is really after sync after sometime. Perhaps my approach is wrong.

  what’s the best way to take the audio from source 1 synced with source 2’s video ?

  Any help is appreciated. Thanks,
  Indy

• FFMPEG rtmp live stream with android fps is too low

  27 novembre 2015, par 蔡明原

  I’m interesting live stream from android to youtube.
  I have compile ffmpeg and write jni to live stream with android.
  but the fps is too low, it always has 3 5 fps, the user view is not good.
  how can i do to change the fps.
  this is my jni code with ffmpeg init.

  AVCodecContext *video_codec_ctx = video_stream->codec;
  
    video_codec_ctx->codec_id = video_codec->id;
  
    video_codec_ctx->codec_type = AVMEDIA_TYPE_VIDEO;
  
    video_codec_ctx->level = 31;
  
  
  
    video_codec_ctx->width = width;
  
    video_codec_ctx->height = height;
  
    video_codec_ctx->pix_fmt = PIX_FMT_YUV420P;
  
  
  
    video_codec_ctx->rc_max_rate = 0;
  
    video_codec_ctx->rc_buffer_size = 0;
  
    video_codec_ctx->gop_size = 30;
  
    video_codec_ctx->max_b_frames = 0;
  
    video_codec_ctx->slices = 8;   
  
    video_codec_ctx->b_frame_strategy = 1;
  
    video_codec_ctx->coder_type = 0;
  
    video_codec_ctx->me_cmp = 1;
  
    video_codec_ctx->me_range = 16;
  
    video_codec_ctx->qmin = 10;
  
    video_codec_ctx->qmax = 51;
  
    video_codec_ctx->keyint_min = 25;
  
    video_codec_ctx->refs= 3;   
  
    video_codec_ctx->trellis = 0;
  
    video_codec_ctx->scenechange_threshold = 40;
  
    video_codec_ctx->flags |= CODEC_FLAG_LOOP_FILTER;
  
    video_codec_ctx->me_method = ME_HEX;
  
    video_codec_ctx->me_subpel_quality = 6;
  
    video_codec_ctx->i_quant_factor = 0.71;
  
    video_codec_ctx->qcompress = 0.6;
  
    video_codec_ctx->max_qdiff = 4;
  
    video_codec_ctx->time_base.den = 30;
  
    video_codec_ctx->time_base.num = 1;
  
    video_codec_ctx->bit_rate = 5200*1000;
  
    video_codec_ctx->bit_rate_tolerance = 0;
  
    video_codec_ctx->flags2 |= 0x00000100;
  
  
  
    fmt_context->bit_rate = 6000*1000;
  
  
  
    av_opt_set(video_codec_ctx, "partitions", "i8x8,i4x4,p8x8,b8x8", 0);
  
  
  
    av_opt_set_int(video_codec_ctx, "direct-pred", 1, 0);
  
    av_opt_set_int(video_codec_ctx, "rc-lookahead", 0, 0);
  
    av_opt_set_int(video_codec_ctx, "fast-pskip", 1, 0);
  
    av_opt_set_int(video_codec_ctx, "mixed-refs", 1, 0);
  
    av_opt_set_int(video_codec_ctx, "8x8dct", 0, 0);
  
    av_opt_set_int(video_codec_ctx, "weightb", 0, 0);
  
  
  
    if(fmt_context->oformat->flags & AVFMT_GLOBALHEADER)
  
        video_codec_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  
  
    LOGI("Opening video codec");
  
    AVDictionary *vopts = NULL;
  
    av_dict_set(&vopts, "profile", "main", 0);
  
    //av_dict_set(&vopts, "vprofile", "main", 0);
  
    av_dict_set(&vopts, "rc-lookahead", 0, 0);
  
    av_dict_set(&vopts, "tune", "film", 0);  
  
    av_dict_set(&vopts, "preset", "ultrafast", 0);  
  
    av_opt_set(video_codec_ctx->priv_data,"tune","film",0);
  
    av_opt_set(video_codec_ctx->priv_data,"preset","ultrafast",0);
  
    av_opt_set(video_codec_ctx->priv_data,"tune","film",0);
  
    int open_res = avcodec_open2(video_codec_ctx, video_codec, &vopts);