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• ffmpeg resulting bitrate higher than expected. did i miss something ? [migrated]

  7 octobre 2013, par zantafio

  i am using ffmpeg to create some h264 transport streams.
  the bitrate for video is 496k, for audio 64k.
  However when the ( 2-pass ) encoding is done, i get a stream with more then 600k.
  i am using the following syntax in my script :

  codec=h264
  
  streamsuffix=ts
  
  audiocutoff=15000
  
  audioprofile=aac_low
  
  audiosamplerate=48000
  
  video_med=496k
  
  audio_med=64k
  
  suffix_med=_med
  
  preset=veryslow
  
  threads=4
  
  dirname="${1%/*}"
  
  filename=$(basename "$1")
  
  extension="${filename##*.}"
  
  filename="${filename%.*}"
  
  
  
  ffmpeg -i $filename"."$extension -preset $preset -strict experimental -threads $threads -c:v $codec -b:v $video_med -bsf:v h264_mp4toannexb -pass 1 -an -f rawvideo -y /dev/null 
  
  ffmpeg -y -i $filename"."$extension -preset $preset -strict experimental -threads $threads -c:a aac -cutoff $audiocutoff -profile:a $audioprofile -b:a $audio_med -ar $audiosamplerate  -c:v $codec -b:v $video_med -bsf:v h264_mp4toannexb -pass 2 $filename$suffix_med"."$streamsuffix

  did i miss something ? do i need to enforce the target bitrate ?
  thanks a lot !

• Add Watermark ffmpeg full video ? [closed]

  10 février 2023, par Joe Cola

  how to set watermark for full video ? I usually set the watermark only in a certain position, but I want the full video

  


  please help with the command

  


  example watermark

  


  I tried the way but can't find the command, please help

  


• When I use ffmpeg to record video, why does recording pause and hang

  24 décembre 2019, par Polarstars

  I am using FFmpeg to record RTP stream, but encounter a problem :

  I use follow command :

  FFmpeg -thread_queue_size 128 -i http://0.0.0.0:8012/rtp/239.3.1.141:1234 -map 0 -c copy -t 36000 /home/iptv/test.ts

  When the video frame number reaches 142275, the following prompt appears :

  1.New video stream 0:2 at pos:5699333740 and DTS:36464.9s

  2.New audio stream 0:3 at pos:5699385628 and DTS:36464.1s

  And then the recording process is suspended.

  According to the prompt, it seems that the location of the video stream has changed.

  I would appreciate it if anyone could help me with this problem

  ---

  Input #0, mpegts, from ’http://0.0.0.0:8012/rtp/239.3.1.141:1234’ :

  Duration : N/A, start : 25297.448000, bitrate : N/A

  Program 1 
  
  
  
  Metadata:
  
  
  
    service_name    : 
  
  
  
    service_provider: 
  
  
  
  Stream #0:0[0x1011]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  
  
  Stream #0:1[0x1100]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 128 kb/s

  Output #0, mpegts, to ’/home/TJTV/TJTV_20191224-073001.ts’ :

  Metadata :

  encoder         : Lavf58.35.101
  
  
  
  Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 25 tbr, 90k tbn, 90k tbc
  
  
  
  Stream #0:1: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 128 kb/s

  Stream mapping :

  Stream #0:0 -> #0:0 (copy)

  Stream #0:1 -> #0:1 (copy)

  Press [q] to stop, [?] for help

  frame= 109 fps=107 q=-1.0 size= 4096kB time=00:00:05.32 bitrate=6297.8kbits/s speed=5.22x

  frame= 133 fps= 65 q=-1.0 size= 4864kB time=00:00:06.33 bitrate=6288.8kbits/s speed=3.08x

  frame= 154 fps= 50 q=-1.0 size= 5888kB time=00:00:07.17 bitrate=6721.6kbits/s speed=2.32x

  frame= 179 fps= 43 q=-1.0 size= 6912kB time=00:00:08.18 bitrate=6918.8kbits/s speed=1.98x

  ---

  ...

  frame=142250 fps= 25 q=-1.0 size= 5452032kB time=01:34:50.95 bitrate=7848.1kbits/s speed= 1x

  frame=142275 fps= 25 q=-1.0 size= 5453056kB time=01:34:51.96 bitrate=7848.2kbits/s speed= 1x

  [NULL @ 0x5faf000] SPS unavailable in decode_picture_timing

  [NULL @ 0x5faf000] non-existing PPS 0 referenced

  [mpegts @ 0x5faab40] New video stream 0:2 at pos:5699333740 and DTS:36464.9s

  [NULL @ 0x5faf000] SPS unavailable in decode_picture_timing

  [NULL @ 0x5faf000] non-existing PPS 0 referenced

  frame=142299 fps= 25 q=-1.0 size= 5454080kB time=01:34:52.94 bitrate=7848.3kbits/s speed= 1x

  [NULL @ 0x5faf000] SPS unavailable in decode_picture_timing

  [NULL @ 0x5faf000] SPS unavailable in decode_picture_timing

  [NULL @ 0x5faf000] non-existing PPS 0 referenced

  [mpegts @ 0x5faab40] New audio stream 0:3 at pos:5699385628 and DTS:36464.1s

  [NULL @ 0x5faf000] SPS unavailable in decode_picture_timing

  [NULL @ 0x5faf000] non-existing PPS 0 referenced

  frame=142299 fps= 25 q=-1.0 size= 5454080kB time=01:34:52.94 bitrate=7848.3kbits/s speed= 1x

  frame=142299 fps= 25 q=-1.0 size= 5454080kB time=01:34:52.94 bitrate=7848.3kbits/s speed= 1x

  frame=142299 fps= 25 q=-1.0 size= 5454080kB time=01:34:52.94 bitrate=7848.3kbits/s speed= 1x

  frame=142299 fps= 25 q=-1.0 size= 5454080kB time=01:34:52.94 bitrate=7848.3kbits/s speed= 1x