Difference between revisions of "Recording the BATC streamer"
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ffmpeg -i rtmp://batc.org.uk/live/<streamname> -c:v copy -c:a copy -f mp4 recording.mp4 | ffmpeg -i rtmp://batc.org.uk/live/<streamname> -c:v copy -c:a copy -f mp4 recording.mp4 | ||
| − | You can also record on a Portsdown | + | You can also record on a Portsdown. ffmpeg is already installed, so you just need to use the command: |
rpidatv/bin/ffmpeg -itsoffset 00:00:1.0 -i rtmp://batc.org.uk/live/<streamname> -c:v copy -c:a copy -f mp4 recording.mp4 | rpidatv/bin/ffmpeg -itsoffset 00:00:1.0 -i rtmp://batc.org.uk/live/<streamname> -c:v copy -c:a copy -f mp4 recording.mp4 | ||
| − | Note - adjust the itsoffset number (final digits are seconds) for best lipsync. | + | You will find "recording.mp4" in the directory that you called the command from. Note - adjust the itsoffset number (final digits are seconds) for best lipsync. The value above seems to work perfectly on a Raspberry Pi 3. |
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| + | On a Raspberry Pi 4 the following (long) command line was required. Note that the streamname is entered twice, once for the audio on stream 0 which is delayed by itsoffset (1.5 seconds) and again for the non-delayed video from stream 1. itsoffset can be adjusted as required. | ||
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| + | rpidatv/bin/ffmpeg -i rtmp://batc.org.uk/live/<streamname> -itsoffset 00:00:1.5 -i rtmp://batc.org.uk/live/<streamname> -map 1:v -map 0:a -c:v copy -c:a copy -f mp4 recording.mp4 | ||
| + | |||
| + | If you are doing an important recording, test with exactly the same configuration (streaming kit and recorder) beforehand and adjust the settings to get them right. | ||
Latest revision as of 20:39, 21 November 2020
You can record a BATC streamer channel on your local PC using ffmpeg.
First you need to install ffmpeg - details elsewhere on this forum.
The basic command is:
ffmpeg -i rtmp://batc.org.uk/live/<streamname> -c:v copy -c:a copy -f mp4 recording.mp4
You can also record on a Portsdown. ffmpeg is already installed, so you just need to use the command:
rpidatv/bin/ffmpeg -itsoffset 00:00:1.0 -i rtmp://batc.org.uk/live/<streamname> -c:v copy -c:a copy -f mp4 recording.mp4
You will find "recording.mp4" in the directory that you called the command from. Note - adjust the itsoffset number (final digits are seconds) for best lipsync. The value above seems to work perfectly on a Raspberry Pi 3.
On a Raspberry Pi 4 the following (long) command line was required. Note that the streamname is entered twice, once for the audio on stream 0 which is delayed by itsoffset (1.5 seconds) and again for the non-delayed video from stream 1. itsoffset can be adjusted as required.
rpidatv/bin/ffmpeg -i rtmp://batc.org.uk/live/<streamname> -itsoffset 00:00:1.5 -i rtmp://batc.org.uk/live/<streamname> -map 1:v -map 0:a -c:v copy -c:a copy -f mp4 recording.mp4
If you are doing an important recording, test with exactly the same configuration (streaming kit and recorder) beforehand and adjust the settings to get them right.