Recherche avancée

Sur d’autres sites (4303)

• ffmpeg - escaping single quotes doesn't work [duplicate]

  18 septembre 2022, par XorOrNor

  I've written a small python script for mass converting audio files. It uses ffmpeg. The problem is it doesn't work for files with single quotes in their filenames.

  


  script :

  


  
import os
import subprocess
import sys
from multiprocessing.pool import ThreadPool as Pool

source_dir="/home/kris/Music/test"
output_dir="/home/kris/Music/test_opus"

def worker(file):

    try:    
        dirname=os.path.dirname(file)
        file=file.replace("'","\\\\'")
        filename=file.split('.flac')[0]
        
        input_file=f"'{source_dir}/{file}'"
        output_file=f"'{output_dir}/{filename}.opus'"
        cmd="ffmpeg -n -i "+input_file+" -c:a libopus -b:a 320k "+output_file
        print(cmd)
        result = subprocess.call(cmd,stdout=subprocess.PIPE,shell=True)
    except:
        print('item error')
        

def start():    
    threads=os.cpu_count()  
    pool = Pool(threads)
    files=os.listdir(source_dir)
    for item in files:
        pool.apply_async(worker, (item,))

    pool.close()
    pool.join()
        
start()



  


  Testing :

  


  


  1. Filename : I'm a file.flac

     


  


  2. When escaping single quote ' with double backslashes \\ - file=file.replace("'","\\\\'") the cmd for ffmpeg is :

     


  


  


  ffmpeg -n -i '/home/kris/Music/test/I\\'m a file.flac' -c:a libopus -b:a 320k '/home/kris/Music/test_opus/I\\'m a file.opus'


  


  ffmpeg returns an error : /home/kris/Music/test/I\\m: No such file or directory

  


  

  3. When escaping single quote ' with a single backslash \ - file=file.replace("'","\\'") the cmd for ffmpeg is :

  


  


  ffmpeg -n -i '/home/kris/Music/test/I\'m a file.flac' -c:a libopus -b:a 320k '/home/kris/Music/test_opus/I\'m a file.opus'


  


  I got an error :

  


  /bin/sh: 1: Syntax error: Unterminated quoted string


  


  According to ffmpeg docs : https://ffmpeg.org/ffmpeg-utils.html#toc-Examples escaping with single backslash should work.

  


• [FFmpeg]how to make codes for converting jpg files to avi(motion jpeg)

  13 avril 2016, par YJJ

  I want to make the code so that I can embed the code to a machine with cameras.

  I have one I have worked on.

  It generates a output avi file, but it doesn’t work.

  I think I didn’t make a logic to input raw images and I don’t know how.

  I want to input 100 jpg images from street_01.jpg to street_99.jpg

  int main(int argc, char* argv[])
  
  {
  
      AVFormatContext* pFormatCtx;
  
      AVOutputFormat* fmt;
  
      AVStream* video_st;
  
      AVCodecContext* pCodecCtx;
  
      AVCodec* pCodec;
  
      AVPacket pkt;
  
      uint8_t* picture_buf;
  
      AVFrame* pFrame;
  
      int picture_size;
  
      int y_size;
  
      int framecnt = 0;
  
      //FILE *in_file = fopen("src01_480x272.yuv", "rb"); //Input raw YUV data 
  
      FILE *in_file = fopen("street_01.jpg", "rb");       //Input raw YUV data
  
      int in_w = 2456, in_h = 2058;                       //Input data's width and height
  
      int framenum = 100;                                 //Frames to encode
  
      //const char* out_file = "src01.h264";              //Output Filepath 
  
      //const char* out_file = "src01.ts";
  
      //const char* out_file = "src01.hevc";
  
      const char* out_file = "output.avi";
  
  
  
      av_register_all();
  
  /*
  
      //Method1.
  
      pFormatCtx = avformat_alloc_context();
  
      //Guess Format
  
      fmt = av_guess_format(NULL, out_file, NULL);
  
      pFormatCtx->oformat = fmt;
  
  */
  
      //Method 2.
  
      avformat_alloc_output_context2(&pFormatCtx, NULL, "avi", out_file);
  
      fmt = pFormatCtx->oformat;
  
  
  
  
  
      //Open output URL
  
      if (avio_open(&pFormatCtx->pb, out_file, AVIO_FLAG_READ_WRITE) < 0){
  
          printf("Failed to open output file! \n");
  
          return -1;
  
      }
  
  
  
      video_st = avformat_new_stream(pFormatCtx, 0);
  
      video_st->time_base.num = 1;
  
      video_st->time_base.den = 25;
  
  
  
      if (video_st == NULL){
  
          return -1;
  
      }
  
      //Param that must set
  
      pCodecCtx = video_st->codec;
  
      //pCodecCtx->codec_id =AV_CODEC_ID_HEVC;
  
      pCodecCtx->codec_id = AV_CODEC_ID_MJPEG;
  
      //pCodecCtx->codec_id = fmt->video_codec;
  
      pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
  
      pCodecCtx->pix_fmt = AV_PIX_FMT_YUV444P;
  
      pCodecCtx->width = in_w;
  
      pCodecCtx->height = in_h;
  
      pCodecCtx->time_base.num = 1;
  
      pCodecCtx->time_base.den = 25;
  
      pCodecCtx->bit_rate = 400000;
  
      pCodecCtx->gop_size = 250;
  
      //H264
  
      //pCodecCtx->me_range = 16;
  
      //pCodecCtx->max_qdiff = 4;
  
      //pCodecCtx->qcompress = 0.6;
  
      pCodecCtx->qmin = 10;
  
      pCodecCtx->qmax = 51;
  
  
  
      //Optional Param
  
      pCodecCtx->max_b_frames = 3;
  
  
  
      // Set Option
  
      AVDictionary *param = 0;
  
      //H264
  
      if (pCodecCtx->codec_id == AV_CODEC_ID_H264) {
  
          av_dict_set(&param, "preset", "slow", 0);
  
          av_dict_set(&param, "tune", "zerolatency", 0);
  
          //av_dict_set(&param, "profile", "main", 0);
  
      }
  
      //H265
  
      if (pCodecCtx->codec_id == AV_CODEC_ID_H265){
  
          av_dict_set(&param, "preset", "ultrafast", 0);
  
          av_dict_set(&param, "tune", "zero-latency", 0);
  
      }
  
  
  
      //Show some Information
  
      av_dump_format(pFormatCtx, 0, out_file, 1);
  
  
  
      pCodec = avcodec_find_encoder(pCodecCtx->codec_id);
  
      if (!pCodec){
  
          printf("Can not find encoder! \n");
  
          return -1;
  
      }
  
      if (avcodec_open2(pCodecCtx, pCodec, &param) < 0){
  
          printf("Failed to open encoder! \n");
  
          return -1;
  
      }
  
  
  
  
  
      pFrame = av_frame_alloc();
  
      //picture_size = av_image_get_buffer_size(pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, 1);
  
      picture_size = avpicture_get_size(pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
  
      picture_buf = (uint8_t *)av_malloc(picture_size);
  
      avpicture_fill((AVPicture *)pFrame, picture_buf, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height);
  
  
  
      //Write File Header
  
      avformat_write_header(pFormatCtx, NULL);
  
  
  
      av_new_packet(&pkt, picture_size);
  
  
  
      y_size = pCodecCtx->width * pCodecCtx->height;
  
  
  
      for (int i = 0; i/Read raw YUV data
  
          if (fread(picture_buf, 1, y_size * 3 / 2, in_file) <= 0){
  
              printf("Failed to read raw data! \n");
  
              return -1;
  
          }
  
          else if (feof(in_file)){
  
              break;
  
          }
  
          pFrame->data[0] = picture_buf;                  // Y
  
          pFrame->data[1] = picture_buf + y_size;         // U 
  
          pFrame->data[2] = picture_buf + y_size * 5 / 4; // V
  
          //PTS
  
          pFrame->pts = i;
  
          int got_picture = 0;
  
          //Encode
  
          int ret = avcodec_encode_video2(pCodecCtx, &pkt, pFrame, &got_picture);
  
          if (ret < 0){
  
              printf("Failed to encode! \n");
  
              return -1;
  
          }
  
          if (got_picture == 1){
  
              printf("Succeed to encode frame: %5d\tsize:%5d\n", framecnt, pkt.size);
  
              framecnt++;
  
              pkt.stream_index = video_st->index;
  
              ret = av_write_frame(pFormatCtx, &pkt);
  
              av_free_packet(&pkt);
  
          }
  
      }
  
      //Flush Encoder
  
      int ret = flush_encoder(pFormatCtx, 0);
  
      if (ret < 0) {
  
          printf("Flushing encoder failed\n");
  
          return -1;
  
      }
  
  
  
      //Write file trailer
  
      av_write_trailer(pFormatCtx);
  
  
  
      //Clean
  
      if (video_st){
  
          avcodec_close(video_st->codec);
  
          av_free(pFrame);
  
          av_free(picture_buf);
  
      }
  
      avio_close(pFormatCtx->pb);
  
      avformat_free_context(pFormatCtx);
  
  
  
      fclose(in_file);
  
  
  
      return 0;
  
  }

• Happy Ada Lovelace Day to Women in Multimedia R&D

  24 mars 2010, par silvia

  In my field of interest, namely Multimedia, there are not many women active in research and technology development. The more reasons to expose them and point to their great achievements. In my time as a young researcher at the University of Mannheim, I met Prof Wendy Hall of the University of (...)