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Yes. FFmpeg can process playlist videos with different resolutions, but the right method depends on whether you want to combine them into one file, play them sequentially, or send them live. For a single consistent output size, decode and re-encode the items, scaling each to a common canvas. Stream-copy concatenation is more restrictive: the inputs must have matching stream layouts, codecs, and time bases.
First, distinguish the three meanings of “stream a playlist”
- Combine: join downloaded items into one output file. FFmpeg can do this, but the method depends on compatibility and whether you need to normalize picture size.
- Play sequentially: retrieve playlist items and process them one at a time. A playlist-aware tool such as yt-dlp can select playlist items; FFmpeg then processes the retrieved media.
- Go live: send video to a live destination. The exact command depends on the playlist sources, their stream layouts, and the destination. There is no universal command established for every YouTube playlist.
Choose stream copy or re-encoding
Stream copy: fast, but strict
Stream copy avoids decoding and encoding the media, but it is not a general fix for mixed resolutions. FFmpeg’s concat demuxer requires the files to have the same streams, including matching codecs and time bases. It adjusts timestamps using each file’s duration, so inaccurate duration information can create artifacts at joins. Inspect the inputs and check the result’s joins and audio/video sync before relying on this route. See the FFmpeg concat documentation.
Decode, filter, and re-encode: flexible output dimensions
When inputs have different dimensions, decode them and apply scaling before concatenation if you want one output frame size. Filtering requires transcoding; FFmpeg’s command-line documentation explains that streams are transcoded unless you specify -c copy, and resizing requires a filter. Re-encoding is more flexible but uses processing resources and, when using a lossy codec, adds another lossy encode.
The concat filter can handle differing frame rates, producing variable-frame-rate output, but corresponding streams still need compatible parameters. Convert resolutions explicitly when they differ. See the FFmpeg concat documentation and FFmpeg command-line documentation.
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Retrieve and prepare playlist items
- Select the playlist items and formats. Use yt-dlp or another playlist-aware retriever to select and retrieve the YouTube videos. yt-dlp documents playlist-item selection, format selection, and writing a downloaded video to stdout. Its format-selection defaults differ when output goes to stdout, so specify the desired format explicitly for a reproducible workflow. See the yt-dlp README.
- Inspect every item before choosing a concat method. Check its video and audio streams, codecs, time bases, dimensions, frame rate, and duration. For stream copy, confirm the concat demuxer’s matching-stream requirements; for the filter route, check that each input has the streams your filter graph maps.
- Decide whether to preserve dimensions or normalize them. If a consistent frame is required, scale each input to the same target dimensions before encoding. If you do not need a common canvas, do not add scaling without a reason.
- Choose the output. A combined file, local sequential playback, and a live destination are different workflows. Confirm the target and its requirements before constructing the final FFmpeg command.
Example: normalize two local files and concatenate
This command shape demonstrates a decode/filter/re-encode path for two local inputs, fitting each video inside a 1280×720 canvas while preserving aspect ratio and padding unused space. It is not a tested command for an arbitrary YouTube playlist:
ffmpeg -i item1.mp4 -i item2.mp4 -filter_complex "[0:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2[v0];[1:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2[v1];[v0][0:a][v1][1:a]concat=n=2:v=1:a=1[outv][outa]" -map "[outv]" -map "[outa]" output.mp4Adapt it after inspecting the actual inputs. The example assumes both files have audio streams and compatible corresponding parameters; it will need changes if a file has no audio, if stream layouts differ, or if other properties require conversion. The filter route re-encodes rather than copying the original streams.
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Common problems and fixes
- Concat demuxer rejects the files or the output behaves badly at a join: compare stream layouts, codecs, and time bases. Use stream copy only when the inputs meet the concat demuxer’s requirements; otherwise decode and filter them.
- Artifacts, gaps, or timing problems near a join: verify input duration information and inspect synchronization around the join. The concat demuxer uses file durations to adjust timestamps, and incorrect durations can cause artifacts.
- Output has inconsistent dimensions: add a scaling step for every video stream and, if needed, pad each to the same canvas before concatenating.
- The example command fails on audio mapping: check whether each input actually contains audio. The example maps one audio stream from each file; inputs without audio need a different filter graph and mapping.
- A playlist-to-live command does not fit your sources: treat retrieval, sequential processing, and live output as separate stages. The correct live-output command depends on source formats and destination details.
Or let it run in the cloud
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