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• Touble when excuting the same ffmpeg command for many times

  4 janvier 2015, par morndust

  Decription

  when using the same ffmpeg command for a couple of times, some of those will succeed, but, some of those would failed, ffmpeg report Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height or Invalid data found when processing input error.

  Input

  ffprobe

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/2137b8d42dcf4607a625755994133e69':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.4.101
  
    Duration: 00:01:00.02, start: 0.021333, bitrate: N/A
  
      Chapter #0.0: start 0.000000, end 60.000000
  
      Metadata:
  
        title           : 00:00:00.000
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x798 [SAR 1:1 DAR 320:133], 3255 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 192 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2(eng): Subtitle: mov_text (text / 0x74786574), 0 kb/s
  
      Metadata:
  
        handler_name    : SubtitleHandler

  Command

  /usr/local/bin/ffmpeg -i /tmp/2137b8d42dcf4607a625755994133e69 -f mp4 -b:v 3000k -r 24.0 -map_metadata -1 -vf scale=50:50 -y /tmp/foo.mp4

  Detail

  when i excute same command above 10 times, error would occur like 3 - 4 times.

  At the end, thanks for reading anyway, any answer would be appriciated.

• FFMPEG HLS video can't play

  4 mai 2019, par John Doe

  I’m using ffmpeg to convert mp4 video to HLS but just copy codec without re-encoding and a lot of video having problem when playing with JWPlayer

  

  First i make a loop to find best segment duration from 15 down to 1, do it over again couple times (480p, 720p, 1080p)

  ffmpeg -i in.mp4 -codec copy -bsf:v h264_mp4toannexb -f hls -hls_list_size 0 -hls_time $second out.m3u8

  If largest segment length is smaller than 10MB then break loop and using single segment option

  ffmpeg -i in.mp4 -f hls -hls_time $second_return_from_loop -hls_list_size 0 -hls_flags single_file -codec copy -bsf:v h264_mp4toannexb out.m3u8

  Generate master playlist with info (bitrate, width x height) getting from ffprobe command

  ffprobe -i in.mp4 -v quiet -print_format json -show_format -show_streams

  Is there something wrong with my command because sometime video got freeze but sound still playing or break on seeking, this’s my first time working with ffmpeg, really appreciate your help

  UPDATED : It was error on my proxy streaming source code not ffmpeg

• Not able to read audio streams with ffmpeg

  14 avril 2013, par talhamalik22

  I am trying to solve a big problem but stuck with very small issue. I am trying to read audio streams inside a video file with the help of ffmpeg but the loop that should traverse the whole file of streams only runs couple of times. Can not figure out what is the issue as others have used it very similarly.
  Following is my code please check :

  JNIEXPORT jint JNICALL Java_ru_dzakhov_ffmpeg_test_MainActivity_logFileInfo
  
      (JNIEnv * env,
  
       jobject this,
  
       jstring filename
  
      )
  
  {
  
  
  
  AVFormatContext *pFormatCtx;
  
  int             i,j,k, videoStream, audioStream;
  
  AVCodecContext  *pCodecCtx; 
  
  AVCodec         *pCodec;
  
  AVFrame         *pFrame; 
  
  AVPacket        packet;
  
  int             frameFinished;
  
  float           aspect_ratio;
  
  AVCodecContext  *aCodecCtx;
  
  AVCodec         *aCodec;
  
  //uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
  
  j=0;
  
  
  
  av_register_all();
  
  char *str = (*env)->GetStringUTFChars(env, filename, 0);
  
   LOGI(str);
  
  // Open video file
  
  if(av_open_input_file(&pFormatCtx, str, NULL, 0, NULL)!=0)
  
      ;
  
  
  
  // Retrieve stream information
  
  if(av_find_stream_info(pFormatCtx)<0)
  
      ;
  
  
  
   LOGI("Separating");
  
  // Find the first video stream  
  
  videoStream=-1;
  
  audioStream=-1;
  
  
  
  for(i=0; i<&pFormatCtx->nb_streams; i++) {
  
  
  
      if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO)
  
      {
  
          LOGI("Audio Stream");
  
          audioStream=i;
  
          }
  
  }
  
  av_write_header(pFormatCtx);
  
  if(videoStream==-1)
  
       LOGI("Video stream is -1");    
  
  
  
  
  
  if(audioStream==-1)
  
       LOGI("Audio stream is -1");
  
  
  
  return i;}