ffmpeg can't concat movies from two different devices - linux

Question

I've got bunch of movies from two different Panasonic devices. As long as I concat movies from only ONE device - final movie is smooth.
However, when I add movie clip from second device, right after final movie ends playing movies from first device it display audio and only still images from movie clip from other device.
ffmpeg -f concat -i mylist.txt -c copy final_movie.MP4
Example ffprobe:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'S6810001.MP4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.27.100
Duration: 00:00:10.62, start: 0.021333, bitrate: 1131 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 998 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 132 kb/s (default)
Metadata:
handler_name : SoundHandle
Second device movie clip:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a/T00004.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.27.100
Duration: 00:00:33.18, start: 0.000000, bitrate: 1190 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 929 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 256 kb/s (default)
Metadata:
handler_name : SoundHandler
Side data:
audio service type: main
Why movie is still? How to prepare it so it could be joined correctly?

Answer 1

You're trying to concat videos that likely have different profiles. Also, the audio formats are different, but they should be the same if you want to stream copy.
Use ffprobe to view more detailed info about each input:
ffprobe -loglevel error -show_streams S6810001.MP4
ffprobe -loglevel error -show_streams a/T00004.mp4
In this example assuming the video in S6810001.MP4 has Main profile and a/T00004.mp4 has Baseline profile you can "conform" a/T00004.mp4 to be more like S6810001.MP4, or vice versa (note that audio can have a profile too, so make sure you're looking at the right section in the ffprobe output). This example command will use the same profile and same audio format:
ffmpeg -i a/T00004.mp4 -profile:v main -c:a aac a/T00004_encoded.mp4
Now use a/T00004_encoded.mp4 as your second input instead of a/T00004.mp4:
ffmpeg -f concat -i mylist.txt -c copy final_movie.MP4