ffmpeg问题与视频流的输出有关

I have two video streams from which I'd like to take one frame of each, both of them are RTSP. I'm using the same FFMPEG instruction for both of them but changing the URL of the stream, the first one works but the second one throws the error:

我有两个视频流我想从中取一帧，它们都是RTSP。我对这两个都使用了相同的FFMPEG指令但是改变了流的URL，第一个行得通，但第二个会抛出错误:

method SETUP failed: 455 Method Not Valid In This State

方法设置失败:455方法在此状态无效

Can anyone tell me what could be the reason for this error and how to solve it?

谁能告诉我这个错误的原因是什么以及如何解决它吗?

WORKING

工作

ffmpeg -ss 1 -i rtsp://streamreader:trudat55@69.84.126.216:88/videoMain -an -vcodec mjpeg -vframes 1 -aspect 16:9 -q:v 2 -y test.jpg

ffmpeg version 2.8.2 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.9.2 (Debian 4.9.2-10)
  configuration: --enable-gpl --enable-avresample --enable-libopencore-amrnb --enable-libx264 --enable-libxvid --enable-postproc --enable-version3 --enable-shared --enable-pic --extra-ldexeflags=-pie
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
[rtsp @ 0x55a60a0a7420] UDP timeout, retrying with TCP
Guessed Channel Layout for  Input Stream #0.1 : mono
Input #0, rtsp, from 'rtsp://streamreader:trudat55@69.84.126.216:88/videoMain':
  Metadata:
    title           : IP Camera Video
    comment         : videoMain
  Duration: N/A, start: 0.200044, bitrate: N/A
    Stream #0:0: Video: h264 (Baseline), yuv420p, 640x480, 50 tbr, 90k tbn, 180k tbc
    Stream #0:1: Audio: pcm_mulaw, 8000 Hz, 1 channels, s16, 64 kb/s
[swscaler @ 0x55a60a102460] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'test.jpg':
  Metadata:
    title           : IP Camera Video
    comment         : videoMain
    encoder         : Lavf56.40.101
    Stream #0:0: Video: mjpeg, yuvj420p(pc), 640x480 [SAR 4:3 DAR 16:9], q=2-31, 200 kb/s, 50 fps, 50 tbn, 50 tbc
    Metadata:
      encoder         : Lavc56.60.100 mjpeg
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
frame=    1 fps=0.5 q=2.0 Lsize=N/A time=00:00:00.02 bitrate=N/A dup=1 drop=1    
video:66kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

NOT WORKING

不工作

ffmpeg -ss 1 -i rtsp://camaras.corredorautomotriz.cl:554/live.sdp -an -vcodec mjpeg -vframes 1 -aspect 16:9 -q:v 2 -y test.jpg

ffmpeg version 2.8.2 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.9.2 (Debian 4.9.2-10)
  configuration: --enable-gpl --enable-avresample --enable-libopencore-amrnb --enable-libx264 --enable-libxvid --enable-postproc --enable-version3 --enable-shared --enable-pic --extra-ldexeflags=-pie
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
[rtsp @ 0x55b98f2de420] UDP timeout, retrying with TCP
[rtsp @ 0x55b98f2de420] method SETUP failed: 455 Method Not Valid In This State
[rtsp @ 0x55b98f2de420] Could not find codec parameters for stream 0 (Video: mjpeg, none(bt470bg/unknown/unknown)): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, rtsp, from 'rtsp://camaras.corredorautomotriz.cl:554/live.sdp':
  Metadata:
    title           : RTSP server
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg, none(bt470bg/unknown/unknown), 90k tbr, 90k tbn, 90k tbc
    Stream #0:1: Data: none
Output #0, image2, to 'test.jpg':
Output file #0 does not contain any stream

2 个解决方案

#1

As I see in your output, ffmpeg failed to determine input stream type in the second case (rtsp://camaras.corredorautomotriz.cl:554/live.sdp).

正如我在您的输出中看到的，ffmpeg未能确定第二种情况下的输入流类型(rtsp:/ camaras. corredorautomotive .cl:554/live.sdp)。

I checked it, and it got me mpeg4:

我检查了一下，它给了我mpeg4:

Input #0, rtsp, from 'rtsp://camaras.corredorautomotriz.cl:554/live.sdp':

输入#0,rtsp，从'rtsp://camaras. corredorautomotive .cl:554/live.sdp':

Metadata:

元数据:

title : RTSP server

标题:RTSP服务器

Duration: N/A, start: 0.000000, bitrate: N/A

持续时间:N/A，起始时间:0.000000，比特率:N/A

Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 720x480 [SAR 1:1 DAR 3:2], 30 tbr, 30k tbn

视频:mpeg4(简单轮廓)，yuv420p, 720x480 [SAR 1:1 DAR 3:2]， 30 tbr, 30k tbn

Thus possibly you compiled ffmpeg without mpeg4 decoder (or with broken decoder).

因此，您可能编译了没有mpeg4解码器的ffmpeg(或使用损坏的解码器)。

#2

I found that if I specify that the protocol is TCP with the instruction -rtsp_transport tcp then i don't get an error:

我发现如果我指定协议是TCP，指令是-rtsp_transport TCP，那么我不会得到错误:

ffmpeg -ss 5 -rtsp_transport tcp -i rtsp://camaras.corredorautomotriz.cl:554/live.sdp -s 640x480 -aspect 16:9 -b:v 800k -r 24 video.flv

ffmpeg - ss5 -rtsp_transport tcp -i rtsp://camaras. corredorautomotive .cl:554/live。sdp -s 640x480 -aspect 16:9 -b:v 800k -r 24可视电话

But I would still like to know the reason and solution of the problem I got before, because I am not sure I can use this parameter. Anyone knows?

但是我仍然想知道我之前的问题的原因和解决方法，因为我不确定我是否可以使用这个参数。有人知道吗?

Thanks

谢谢

#1