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• Multiple download trim videos ffmpeg + youtube-dl [duplicate]

  4 décembre 2020, par sl4g

  I'm tryng to make a bash script to download and trim videos from URLs in a .txt file, using ffmpeg and youtube-dl. From the Internet I found this https://askubuntu.com/questions/970629/how-to-download-a-portion-of-a-video-with-youtube-dl-or-something-else and this How can I batch/sequentially download m3u8 files using ffmpeg ? and based on that I made this :

  


  #!/bin/bash

#only download the half of urls

HoldList="/home/user/desktop/dir1/code/bash/web.txt"

index=0
while read line ; do
    ffmpeg -ss 00:50:30 -to 00:51:00 -i "$(youtube-dl -f best --get-url $line)" -c:v copy -c:a copy output-${index}.mp4
    ((index=index+1))
done < "$HoldList"


  


  This code only downloads half of the videos. Download one, ignore the next, then repeat...

  


  How can I make not skip every other URL from the file ?

  


  I'm a newbie in Bash script (and in this site), and English is not my first language.

  


• How to stop ffmpeg when there's no incoming rtmp stream

  5 juillet 2016, par M. Irich

  I use ffmpeg together with nginx-rtmp.
  The thing is ffmpeg doesn’t finish the process when the stream’s finished

  I use the following command :

  ffmpeg  -i 'rtmp://localhost:443/live/test' -loglevel debug  -c:a libfdk_aac -b:a 192k -c:v libx264 -profile baseline -preset superfast -tune zerolatency -b:v 2500k -maxrate 4500k -minrate 1500k -bufsize 9000k -keyint_min 15 -g 15 -f dash -use_timeline 1 -use_template 1 -min_seg_duration 5000 -y /tmp/dash/test/test.mpd

  but even the stream’s not running ffmpeg still can’t finish the process and is waiting for the rtmp stream

  Successfully parsed a group of options.
  
  Opening an input file: rtmp://localhost:443/live/test.
  
  [rtmp @ 0x2ba2160] No default whitelist set
  
  [tcp @ 0x2ba2720] No default whitelist set
  
  [rtmp @ 0x2ba2160] Handshaking...
  
  [rtmp @ 0x2ba2160] Type answer 3
  
  [rtmp @ 0x2ba2160] Server version 13.14.10.13
  
  [rtmp @ 0x2ba2160] Proto = rtmp, path = /live/test, app = live, fname = test
  
  [rtmp @ 0x2ba2160] Server bandwidth = 5000000
  
  [rtmp @ 0x2ba2160] Client bandwidth = 5000000
  
  [rtmp @ 0x2ba2160] New incoming chunk size = 4096
  
  [rtmp @ 0x2ba2160] Creating stream...
  
  [rtmp @ 0x2ba2160] Sending play command for 'test'

  Is it possible to limit the latency time to several seconds ?

  Sorry for any possible mistakes - English’s not my native language.

• How to transfer FFmpeg's AVPacket to CUVID's CUVIDSOURCEDATAPACKET ? or how to use FFmpeg's CUVID,any demo ?

  17 mars 2017, par San

  As the title said,I was trapped to How to transfer FFmpeg’s AVPacket to CUVID’s CUVIDSOURCEDATAPACKET,and my main code about this question is below :`

  AVPacket* avpkt;
  
  avpkt = (AVPacket*)av_malloc(sizeof(AVPacket));
  
  CUVIDSOURCEDATAPACKET cupkt;
  
  int iPkt = 0;
  
  while (av_read_frame(pFormatCtx, avpkt) >= 0) {
  
      if (avpkt->stream_index == videoindex) {
  
  
  
          cuCtxPushCurrent(g_oContext);
  
  
  
          if (avpkt && avpkt->size) {
  
              cupkt.payload_size = (unsigned long)avpkt->size;
  
              cupkt.payload = (const unsigned char*)avpkt->data;
  
  
  
              if (avpkt->pts != AV_NOPTS_VALUE) {
  
                  cupkt.flags = CUVID_PKT_TIMESTAMP;
  
                  if (pCodecCtx->pkt_timebase.num && pCodecCtx->pkt_timebase.den) {
  
                      AVRational tb;
  
                      tb.num = 1;
  
                      tb.den = AV_TIME_BASE;
  
                      cupkt.timestamp = av_rescale_q(avpkt->pts, pCodecCtx->pkt_timebase, tb);
  
                  }
  
                  else
  
                      cupkt.timestamp = avpkt->pts;
  
              }
  
          }
  
          else {
  
              cupkt.flags = CUVID_PKT_ENDOFSTREAM;
  
          }
  
  
  
          oResult = cuvidParseVideoData(hParser_, &cupkt);
  
          if ((cupkt.flags & CUVID_PKT_ENDOFSTREAM) || (oResult != CUDA_SUCCESS)) {
  
              break;
  
          }
  
          iPkt++;
  
          printf("Succeed to read avpkt %d !\n", iPkt);
  
          checkCudaErrors(cuCtxPopCurrent(NULL));
  
      }
  
      av_free_packet(avpkt);
  
  }

  and as you see,the code

  cupkt.payload_size = (unsigned long)avpkt->size;
  
  cupkt.payload = (const unsigned char*)avpkt->data;

  needs to be corrected。
  I’m poor at english,I hope I have expressed my self clearly。